NON-WOVEN BLANKET UNDERSTANDING FIBERS IN A THERMALLY LINED BLANKET, METHOD FOR THE PRODUCTION OF A

专利摘要:
HIGH TEMPERATURE TREATED HALF. It is a thermally bonded filtration medium that can be used in high temperature conditions in the absence of any loss of fiber through thermal effects or mechanical impact on the fiber components. The filter medium can be manufactured and used in a filtration unit or structure, can be placed in a removable fluid stream and can remove a particulate charge from the moving stream over a high temperature range. The combination of two-component fiber, another filter medium fiber and other filtration additives provides an improved filtration medium that has unique properties in high performance, high temperature applications.
公开号:BR112013023955B1
申请号:R112013023955-7
申请日:2012-03-16
公开日:2021-01-12
发明作者:Daniel Little；Robert M. Rogers
申请人:Donaldson Company, Inc.；
IPC主号:

专利说明:

[0001] [001] This application claims priority for Provisional Patent Application No. US 61 / 454,171, filed on March 18, 2011 and claims priority for Provisional Patent Application No. US 61 / 454,172, filed on March 18, 2011, their contents are incorporated in this document as a reference in their entirety. Field of the Invention
[0002] [002] The invention relates to a thermally formed composition in the form of a blanket or layer, with a filter medium or means and a filter structure having improved properties. The improved permeability, high temperature resistance, mechanical stability and high capacity for removing aerosol or particulate matter from a moving fluid, including drafts, gas or liquid that can result from the thermally formed composition. Filter media can be formed in a variety of filter units in the form of panels, cartridges, inserts, pleated forms of filtration, etc. Background of the Invention
[0003] [003] Nonwoven fibrous media, blankets or layers have been manufactured for many years for many purposes including filtration. A media arrangement that has an acceptable set of properties is available. The complexities inherent in the manufacture of these media increase costs and reduce flexibility in product offerings.
[0004] [004] Such fibrous nonwoven media are useful in a variety of applications, including aerosol filtration or solid air or liquid particulates, such as dust and mist filtration, crankcase ventilation (CCV) and open crankcase ventilation ( OCV). Such media can also be formed in layered media structures.
[0005] [005] Fibrous non-woven media can be manufactured from natural or synthetic fibers and can be formed in a variety of media types. A recent medium is shown in U.S. Patents 7,314,497, 7,309,372 and 5,580,499 and comprises, in general, a bicomponent fiber and glass fibers that are thermally bonded to a blanket. Such media have useful pore size and filtration efficiencies of the combined fiber component.
[0006] [006] Many degrees of filter media, including two-component fiber media, are used at temperatures greater than about 100 ° C and are, more recently, used at temperatures greater than about 130 ° C to 150 ° C and more. Future means will be exposed to higher temperatures and other adverse operating conditions. At such temperatures and under such conditions, fibrous media bound by thermoplastic resins and two-component thermoplastic media can soften or fail. Such smoothed structures may have reduced filtration properties, may fail mechanically during use or, as a result of smoothing or reduced tensile strength, portions of the filtration media may be lost from the media and may enter the fluid stream causing difficulties downstream. Such problems can occur in any application that experiences consistently high operating temperatures or that experiences periodic temperature extremes. Such media require sufficient filtration properties to remove particulate while maintaining a low pressure drop across the medium. The media used in CCV (closed crankcase ventilation) or OCV (open crankcase ventilation) applications must quickly drain accumulated oily liquids.
[0007] [007] An environment of interest is "under the hood" filtration that is now becoming more common. Due to environmental concerns and other design characteristics, several types of engine filters are most commonly used within a engine and adjacent to engine components. In modern engines and, in particular, diesel engines, temperatures under the hood continue to pose operational challenges for filtration applications, including air filtration, oil filtration, hydraulic filtration, ventilation applications sump (OCV and CCV) and others In such engines, the filter media can operate at high temperature. Additionally, after the engine has been switched off, the filter media are thermally embedded in high temperature engine fluids (air, lubricants Such fuels need to be equipped with filters and filtration media that can withstand substantially higher thermal immersion temperatures.
[0008] [008] There is a substantial need for filtration media that can withstand high temperatures without suffering a negative performance impact on filtration properties, mechanical integrity, or without loss of filtration components. There is a substantial need to reduce or eliminate the glass fiber from the medium.
[0009] [009] Additionally, the manufacture of filtration media from fiberglass, however, can result in the medium running down fiberglass from the blanket structure. The glass fibers leaving the filtration means can enter the flow downstream of the filter fluid. The flow can direct the fiberglass to the operating mechanism or unit associated with a filter structure. Thus, there is a need in the industry to reduce or eliminate the glass fiber from the filtration media. Brief Description of the Invention
[0010] [0010] A thermally bonded filter medium with improved properties has been revealed. A first aspect of the medium can provide filtration properties at temperatures, for example, greater than 100 ° C, greater than 130 ° C and often up to and greater than 150 ° C in a thermal saturation mode or in the operating engine or in a fluid that passes through the filter medium. The filtering structure comprises a first two-component fiber, a second optional two-component fiber and a textile thermoplastic fiber or cellulosic fiber which, in combination, may have improved temperature and filtration properties and an improved manufacturing character. In addition, such improved high temperature media may allow the use of elements under higher temperature conditions and may result in smaller, more effective units, allowing more flexibility in engine design and extended filter life.
[0011] [0011] A second aspect of the medium is a substantial exemption from fiberglass that has substantial efficiency, mechanical stability, extended life, versatility and substantial cleaning (or regeneration) capacity under a variety of extreme conditions, including high temperature.
[0012] [0012] It was also observed a method of manufacturing the filter medium having thermally bonded, in the absence of a substantial amount of glass fiber which results in the rapid removal of industrial water in the fast and efficient formation of a wet dehydrated mat, rapid drying and efficient thermal connection of the formed mat to the final dry filter media. The process involves combining a first bicomponent fiber source, an optional second bicomponent fiber source and an effective blanket formation amount of a textile fiber to form a watery paste, forming a wet blanket of the watery paste in one month. 'inclined screen paper making machine, the removal of industrial water from the wet mat, the drying of the wet mat and the thermal processing of the mat formed in a finished medium. It has been found that combining these fibers quickly and effectively forms a highly useful filtration medium.
[0013] [0013] The means of the invention can be used in a variety of applications for the purpose of removing solid or liquid particulates from a variety of fluid materials including gases and liquids. In addition, the filter media of the invention can be used in a variety of filter element types including flat media, pleated media, flat panel filters, rotary cylindrical filters, z-pleated filters and other modalities in which the fiber and additive components provide useful properties.
[0014] [0014] The means of the invention comprise an effective amount of a bicomponent fiber. The term "bicomponent fiber" means a fiber that has at least a portion of thermoplastic polymer polymer with a melting point and a second portion of thermoplastic structural polymer with a different melting point and greater than the polymer polymer portion. of these fibers is typically in a "side-by-side" or "core-coat" structure. In a side-by-side structure, the two thermoplastic polymer resins are typically extruded into a shape connected to a side-by-side structure. a lower melting point acts as a binder and the larger melting point polymer acts as a structural material. It is possible to use lobed fibers where the lobes, or tips, are formed from the smaller melting point polymer. , the core contains the major structural fiber melting point and the coating contains the minor bond layer melting point.
[0015] [0015] The term "in the substantial absence of fiberglass" or "substantially free of fiberglass" is intended to mean that the filtration medium does not contain a significant amount of fiberglass that contributes to filtration properties in any The filtering properties of the media are derived from bicomponent fibers, textile fibers and other secondary fibers used in the manufacture of filter media. Of course, insignificant amounts of glass fibers can be introduced into the mat without the formation of a medium that depends on glass fibers for any substantial increase in filtration properties.
[0016] [0016] An "element" is a filtering portion including the maintainer or the medium of the invention. A filter generally includes an element in a structure that can be manufactured in a manufacturing operation.
[0017] [0017] For use in this document, the term "fiber" or "fiber source" indicates a large number of fibers of related composition such that all fibers are within the range of fiber sizes or distributed fiber characteristics about a medium or medium fiber feature or size. Such fibers are characterized by an average diameter and an aspect ratio and are made available as a separate raw material. Merges from one or more of these sources are not read from single sources.
[0018] [0018] "Fiberglass" means the fiber of various diameters and lengths made using glass of various types.
[0019] [0019] The means of the invention may include a "textile fiber." Textile fibers are single-component fibers and fibers other than glass, except bicomponent fiber, common in media that have a diameter, length and aspect ratio suitable for use. in filtration applications Textile fibers provide pore size control and cooperate with other fibers in the media to result in a substantial flow rate medium, high capacity, substantial efficiency and high moisture resistance. it can also improve the manufacture of the materials of the invention. Examples of textile fibers useful in the filter media of the invention are cellulosic and polyester fibers. Cellulosic fibers include cotton fibers, such as cotton linter fibers. Other useful textile fibers include synthetic polymer fibers such as nylon fibers, polyurethane fibers and the like.
[0020] [0020] For use in this document, the term "secondary fibers" can include a variety of fibers other than natural, synthetic or special sources. Such fibers can be thermoplastic and are used to obtain a thermally bonded medium, medium or filter sheet, and can also assist in obtaining appropriate pore size, permeability, efficiency, tensile strength, compressibility, and other filter properties. The medium of the invention is manipulated to obtain improved strength, thickness, base weight, fiber diameter, pore size, efficiency, permeability, tensile strength and compressibility to obtain efficient filtration properties when used to filter a fluid stream.
[0021] [0021] For use in this document, the term "solidity" means a volume of solid fiber divided by the total volume of the filter medium, usually expressed as a percentage. The solidity of the media used to filter a dust from an air stream can be different from the strength of the media used to filter aqueous or oily aerosol from an air stream In addition, the strength of the media used to remove particulates from a liquid stream may be different from the strength of the media used to remove particulates from a stream Each application of the technology is directed to a certain set of operational parameters as discussed below.
[0022] [0022] For use in this document, the term "blanket" refers to a structure similar to the blade or plane that has a thickness greater than about 0.05 mm. This thickness dimension can be at least 0.05 mm , at least 0.08 mm and at least 0.1 mm, for example. This thickness dimension can be no more than 2 cm, no more than 1 cm or no more than 5 mm for example. blanket are not limited and can be an indeterminate or arbitrary choice. Such a blanket is flexible, machinable, pleatable filter media that otherwise have the ability to form into a filter element or filter structure. The blanket can have a gradient region and it can also have a constant region.
[0023] [0023] For use in this document, the plural term "filter media" or the singular term "filter media" refers to a mat that has at least minimal permeability and porosity to be useful in a filter element and is not a substantially layer waterproof as conventional paper, coated stock solution or newsprint manufactured in conventional papermaking wet deposition processes.
[0024] [0024] For use in this document, the term "fiber morphology" means the shape, shape or structure of a fiber. Examples of particular fiber morphologies include twisted, crimped, rounded, ribbon-like, straight or spiral. For example , a fiber with a circular cross section has a different morphology from a fiber with a similar shape to the ribbon.
[0025] [0025] For use in this document, the term "fiber size" is a subset of morphology and includes the "aspect ratio," that is, the ratio between length and diameter. "Diameter" refers to the average diameter of a substantially circular cross-section of a fiber or to a larger cross-sectional dimension of a non-circular fiber.
[0026] [0026] For use in this document, the term "fiber composition" means the chemical nature of the fiber and the fiber material or materials, including the disposition of fiber materials. The fiber composition can be organic or inorganic. The fibers organic compounds are typically natural or synthetic and polymeric or biopolymeric in nature. Examples of fiber composition include glass, cellulose, hemp, abacus, a polyolefin, a polyester, a polyamide, a halogen polymer, a polyurethane, or a combination , blends or alloys of them. Inorganic fibers are made of glass, metals and other non-organic carbon source materials.
[0027] [0027] For use in this document, the term "surface loading", "surface loading" or "surface loading means" refers to the means that substantially accumulate their particle loading on the surface and not within the surface. thickness or depth of the media.
[0028] [0028] For use in this document, the term "depth media", "depth loading layer" or "depth loading means" refers to filter media in which a filtered particulate is captured and maintained over the thickness or z dimension of the depth media. In general, a depth media arrangement can be designed to provide loading of particulate materials substantially through its volume or depth, so such arrangements can be designed to load with a larger amount of material particulate, in relation to charged surface systems, when the total filter life is reached. particulate within the thickness of the depth media. In many applications, especially those involving relatively high flow rates high, depth media can be used. Depth media are, in general, defined in terms of their porosity, density or percentage solids content. For example, the 2 to 3% solidity media would be a base of fiber depth media arranged so that approximately 2 to 3% of the total volume comprises fibrous (solid) materials, the remainder being fluid or air space. . Another useful parameter for defining depth media is the fiber diameter. If the percentage of strength is kept constant, but the fiber diameter (size) is reduced, the pore size is reduced; that is, the filter becomes more efficient and will trap small particles more effectively. A typical conventional depth media filter is a medium of relatively constant (or uniform) density, that is, a system in which the solidity of the depth media remains substantially constant throughout its thickness. However, in some depth media, there may be one or more gradients. For example, the concentration of a fiber can change from a first upstream surface to a second downstream surface; that is, through the thickness of the medium.
[0029] [0029] For use in this document, the term “substantially constant” means that only relatively small fluctuations (no more than about 5%), if any, are found in a property indicated as concentration or density, along the depth of the means. Such fluctuations, for example, may result from a slight compression of an external engaged surface, by a container in which the filter media are positioned. Such fluctuations, for example, can also result from the small, but inherent, enrichment or depletion of fiber in the blanket caused by variations in the manufacturing process. A medium can have a region that is a substantially constant region of concentration of a fiber.
[0030] [0030] For use in this document, the terms "loading means", "loading layer", "efficiency means" or "efficiency layer" refer to filter elements that have a combination of at least two media or layers of different media, where a medium has a smaller average pore size and is called an efficiency layer and the medium which has a larger average pore size is called the loading layer, loading means or depth loading means. The loading layer is typically followed in a fluid path by the efficiency layer. The efficiency layer has adequate porosity, efficiency, permeability and other filtration characteristics to remove any remaining particulate from the fluid stream as the fluid exits the loading layer.
[0031] [0031] For the purpose of this description, the term "pore size" refers to spaces formed by fibrous materials within the media. The pore size of the media can be estimated by reviewing electron photographs of the media. The average pore size of a medium can also be calculated using a Capillary Flow Porometer that has the model number APP 1200 AEXSC available from Porous Materials Inc. of Ithaca, NY.
[0032] [0032] For the purpose of this description, the term "bonded fiber" indicates that, in the formation of the means or blanket of the invention, fibrous materials form a physical or chemical bond to adjacent fibrous materials. Such bond can be formed using the inherent properties of the fiber, such as by melting the component with a lower melting point of a bicomponent fiber Alternatively, the fibrous materials of the mat or means of the invention may be those with the use of separate resin binders which are provided, in some cases, in the form of an aqueous dispersion of a binder resin. Alternatively, the fibers of the invention can also be cross-linked with the use of cross-linking reagents, linked with the use of an electron beam or other energetic radiation that can cause the fiber to bind , through high temperature bonding or through any other bonding process that can cause one fiber to bond to another.
[0033] [0033] For use in this document, the term "source" is a point of origin, like a point of origin of a fluid flow stream comprising a fiber. An example of a source is a nozzle. Another example is a inbox.
[0034] [0034] For use in this document, the term "paste" means a relative diluted blend of fibers and liquid (less than 10% by weight of solids; often less than 5% by weight of solids and often less than 1% by weight of solids). In some embodiments, the liquid includes water. In some embodiments, the paste liquid is water and is an "aqueous paste".
[0035] [0035] For use in this document, the term "wet layer" means a layer made of a paste by removing water or aqueous media from the paste, leaving the moist fiber in the form of a "wet layer." This moist layer is dried to form the medium.
[0036] [0036] "Machine direction" is the direction parallel to the direction that a blanket travels through an appliance, such as an appliance that produces the blanket. In some embodiments, the machine direction is the direction of the longest dimension of the mat.
[0037] [0037] The means of the invention can be used in a variety of applications for the purpose of removing solid or liquid particulates from a variety of fluid materials including gases or liquids. In addition, the filtered medium of the invention used in a variety of filter element types including flat media, wraps, pleated media, flat panel filters, rotary cylindrical filters, pleated media z filters and other modalities in which fiber and additive components provide useful properties even in the absence of fiberglass component.
[0038] [0038] It has been found that the careful selection of one or more textile fibers made from polyester, cotton and other sources can result in substantially improved filter media properties or improved throughput and processing. The means can also comprise a fluorochemical treatment. These fluoro-chemical media have been found to have substantially improved durability, and may experience improved pressure drop during operation at similar or improved efficiencies and, when used in crankcase ventilation, may have reduced mass increase due to oil retention and oil drainage. substantially improved. Detailed Description
[0039] [0039] The means include non-woven blankets comprising a thermally bonded blanket comprising a first two-component fiber and a second two-component fiber or optional textile fiber that can operate at elevated temperatures. The means of the invention comprise a thermally bonded mat comprising the bicomponent fiber with high temperature coating melting properties that can be combined with fibers from textile media or secondary fibers, and can be substantially free of fiberglass. In one embodiment, the bicomponent fiber (s) is combined with a textile polyester fiber. In another embodiment, the bicomponent fiber (s) is combined with a textile cellulosic fiber, preferably a cotton lint fiber. In a third embodiment, a method of forming the thermally bonded mat comprises combining a bicomponent fiber in an aqueous paste with other textile fibers and forming the mat using conventional inclined canvas papermaking machines. A final embodiment comprises a method of filtering a mobile fluid.
[0040] [0040] The filter materials described in this document (media or filter media) can be used in a variety of filter applications, including, but not limited to, clean pulse and pulse filters for dust collection, OCV and CCV applications , in gas turbines and engine air induction or intake systems, gas turbine intake or induction systems, heavy duty engine intake or induction systems, light vehicle engine intake or induction systems, air vehicle cabin, off-road vehicle cabin air, disk drive air, photocopier toner removal, and HVAC filters in commercial and industrial filtration applications. In general, such filter elements comprise a dense blanket or two-component fiber base with cellulose, synthetic or other fibers oriented along a gas stream that carries particulate material. The blanket or element is constructed, in general, to be permeable to the gas flow, and also to have sufficiently fine pore size and appropriate porosity in order to inhibit the passage of particles larger than a passage of selected size. As gases (fluids) pass through the mat or element, the upstream side of the mat operates through diffusion and interception to capture and retain liquid or solid particles of selected size from the gas or liquid (fluid) stream. The particles can be collected as a pie on the upstream side of the "surface loading" blanket or can be collected through the "depth loading" aspect of the filter media.
[0041] [0041] In general, the filtering materials described in this document can be used to filter air and gas streams that frequently transport the particulate material that has entered them. In many cases, part or all of the chain's particulate material is required for continuous operations, comfort or aesthetics. For example, air intake streams for motor vehicle cabins, motors for motor vehicles or for power plant equipment; gas streams directed to gas turbines; and drafts for various combustion furnaces, often include particulate matter. In the case of cabin air filters, it is desirable to remove particulate matter for passenger comfort and / or for aesthetics. In relation to air and gas intake streams for engines, gas turbines and combustion furnaces, it is desirable to remove particulate material due to the fact that it can cause substantial damage to the equipment involved.
[0042] [0042] In other cases, production gases or exhaust gases from industrial processes or engines may contain particulate matter. Before these gases can, or should, be discharged through various locations in the upstream equipment or into the atmosphere, it may be desirable to achieve substantial removal of particulate material from these streams.
[0043] [0043] In general, the filter materials described in this document can be applied to liquid filter systems. In liquid filtration techniques, it is believed that the collection mechanism is sifting when the particles are removed by size exclusion. In a single layer, the efficiency is that of the layer. The composite efficiency in a liquid application is limited to the efficiency of the single layer with the highest efficiency. The liquids could be directed through the means according to the invention, with the particulates captured therein in a sieving mechanism. In liquid filtration systems, that is, in which the particulate material to be filtered is transported in a liquid, such applications include mixed aqueous, non-aqueous and aqueous / non-aqueous applications such as water streams, lubricating oil, hydraulic fluid, systems of fuel filtration or mist collectors, for example. Aqueous currents include natural currents and produced by human action such as effluents, cooling water, industrial water, etc. Non-aqueous currents include gasoline, diesel fuel, petroleum and synthetic lubricants, hydraulic fluid and other ester-based working fluids, cutting oils, food-grade oil, etc. Mixed streams include dispersions comprising water in oil and oil in water and aerosol compositions comprising water and a non-aqueous component.
[0044] [0044] Fluid streams (liquid and gaseous) carry substantial amounts of particulates as solids, as aerosol liquids, or both. Most liquid droplets within the aerosol are generally less than 100 microns, but can be within the size of 0.01 to 50 microns, or 0.1 to 5 microns. In addition, such streams also carry substantial amounts of fine particulate contaminants, such as carbon contaminants. Such contaminants can, in general, be greater than 100 microns and can have an average particle size of about 0.5 to 3 microns. The filter materials described in this document are adapted for the purpose of removing particulates from fluid streams that have a particle size of about 0.01 to 100 micrometers, from gas streams containing liquids in the form of a mist that has droplet size of about 0.01 to 100 micrometers, of aqueous streams that have a particle size of about 0.1 to 100 micrometers of non-aqueous streams that have a particle size of about 0.05 to 100 micrometers or fuel, lubricant or hydraulic chains that have a particle size of about 0.05 to 100 micrometers.
[0045] [0045] A variety of efforts have been directed towards reducing contaminants in many filtered systems. The variables that affect removal include the following: (a) problems with size / efficiency; that is, a desire for satisfactory separation efficiency while, at the same time, avoiding demand for a larger separation system; (b) cost / efficiency; that is, a desire for satisfactory or high efficiency without requiring substantially expensive systems; (c) versatility; that is, development of systems that can be adapted for a wide variety of applications and uses, without significant new manipulation; and, (d) cleaning / regeneration capabilities; that is, development of systems that can be readily submitted to cleaning (or regenerated) if it becomes desired, after prolonged use.
[0046] [0046] A further aspect of the invention comprises a preferred filtration method with crankcase ventilation filters (OCV and CCV). Filter media in arrangements for filtering engine gases including crankcase gases can also be used. The preferred media is produced in sheet form from wet spinning processes and is incorporated into filtering arrangements, in a variety of ways, for example, by a wrapping or wrapping approach or by providing, in a panel construction, Linter constructions for preferred uses for filtering blowing gases from engine crankcases are provided. Preferred cartridge or filter element arrangements including the preferred type of medium are also provided.
[0047] [0047] It was found that, through mixing, various proportions of medium fiber (s) or textiles and bicomponents can be obtained which have substantially improved resistance and filtration at elevated temperatures. In addition, failure to use substantial amounts of fiberglass and a mixture of various fiber diameters can also result in intensifying properties.
[0048] [0048] Wet and dry spinning processes can be used. In one embodiment, to produce the filter media, a fiber tarp is formed using wet or dry spin processing. The tarp is heated to fuse thermoplastic materials to form the media internally adhering to the fibers. The bicomponent fiber used in the media allows the fiber to fuse with a mechanically stable blade, medium or filter. The bicomponent fiber that has an outer thermally bonded coating (or other bicomponent shape) causes the bicomponent fiber to bond with other fibers in the media layer. In less preferred embodiments, the bicomponent fiber can be used with an aqueous or solvent-based queen and other binders to form the medium.
[0049] [0049] In the preferred wet spinning processing method, the medium is produced from a diluted aqueous slurry (0.05 to 5% by weight of solids in the slurry) which comprises a dispersion of fibrous material in an aqueous medium . The aqueous liquid of the dispersion is, in general, water, but can include various other materials such as pH adjustment materials, surfactants, defoamers, flame retardants, viscosity modifiers, media treatments, colorants and the like. The aqueous liquid is usually drained from the dispersion by conducting the dispersion on an inclined screen or other perforated support that retains the dispersed solids and passing through the liquid to provide a wet paper composition. The wet composition, when formed on the support, is usually further dehydrated by vacuum or other pressure forces and further dried by evaporating the remaining liquid. After the liquid is removed, thermal bonding typically occurs by melting some portion of the resin, thermoplastic fiber or other portion of the formed material. The molten material bonds the component to a layer.
[0050] [0050] The means described in this document can be manufactured in equipment of any scale of proportions of manual blade or manual laboratory screen for the manufacture of commercial size paper. For a commercial scale process, the two-component tarpaulins are, in general, processed through the use of inclined canvas paper making machines as commercially available machines Fourdrinier, wire cylinder, Stevens Former, Roto Former, Inver Former, Venti Former, Delta Former leaning. Preferably, an inclined Delta Former machine is used. The general process involves making a dispersion of bicomponent fibers, textile fibers or media, or other media material in an aqueous liquid, draining the liquid from the resulting dispersion to provide a wet composition and adding heat to form bond and drying the wet non-woven composition to form the medium. After formation, the wet or dry mat can be treated with additive materials to provide added properties.
[0051] [0051] Preferably, the filtration media of the invention are typically subjected to wet spinning and consist of a randomly oriented arrangement of a combination of bicomponent fiber (s) and textile fiber, such as a polyester fiber or cellulosic. These fibers are bonded together with the use of the fused polymer in the bicomponent fiber and, in some modalities, with the addition of a binder or a resin. The preferred mat is free of resin binder.
[0052] [0052] In one embodiment, the means that can be used in the filters and methods described in this document comprise a textile fiber, a bicomponent binder fiber, a binder and other components. Textile fiber can include organic fibers such as natural and synthetic fibers including polyolefin, polyester, nylon, cotton, cotton wool, lint or wool, etc. The media fiber of the invention can also include a small amount (often less than 5% by weight) of inorganic fiber such as metal, silica, boron, carbon and other related fibers.
[0053] [0053] The filter media of the present invention are typically suitable for high efficiency filtration properties so that fluids, including air and other gases, aqueous and non-aqueous fuel, lubricant, hydraulic fluids or other fluids can be quickly filtered to remove contaminating particulates.
[0054] [0054] Piston engines including pressure-loaded diesel engines often generate "pass-through" gases, that is, a flow of air and fuel mixture that leaks beyond the combustion chamber pistons. Such "gases pass-through "generally comprise a gas phase, for example air exhaust or combustion gases, which carry: (a) hydrophobic fluid (for example, oil, including fuel aerosol) which comprises mainly droplets of 0, 05 to 10.0 microns (mostly by number) and (b) combustion carbon contaminants that typically comprise carbon particles, most of which are conventionally sized from about 0.1 to 1.0 microns. Such " pass gases "are, in general, directed out of the engine block by means of a vent vent.
[0055] [0055] When the term "hydrophobic fluids" is used in reference to the liquid aerosol trapped in the gas stream, the reference is related to non-aqueous fluids, especially oils. In general, such materials are immiscible in water. The term "gas" or variants thereof, used in conjunction with the carrier fluid, refers to air, combustion exhaust gases and other carrier gases for the aerosol.
[0056] [0056] Engines operating in such systems as trucks, farm machinery, boats, buses and other systems generally comprise piston engines (gasoline and diesel), high pressure diesel engines experience gas flows of significant contaminated CCV or OCV or air as described above. For example, flow rates can be about 2 to 50 feet per minute (fpm) or 0.6 to 15 m-min-1, typically 5 to 10 fpm or 1.6 to 3.2 m-min- 1. In a turbocharged diesel engine, air is drawn into the engine through an air filter, cleaning the air removed from the atmosphere. A turbo pushes clean air through a filter in the engine. The air is subjected to compression and combustion by inclusion inside the combustion chamber and engages the pistons and fuel. During the combustion process, the engine expels passing gases. A filtering arrangement is in communication by gas flow communication with the engine and cleans the pass gases that are returned to the intake of air, fuel or other induction system components. The gases and air are again removed through the turbo and the engine. The filtering arrangement in gas flow communication that is used to separate a hydrophobic liquid phase from a gas stream (sometimes referred to herein as a mixer / separator arrangement) is provided using the filter media described in this document. During operation, a stream of contaminated gas is directed to the mixer / separator arrangement. Within the arrangement, the fine oil phase or aerosol phase (i.e., hydrophobic phase) mixes. The arrangement is constructed so that the hydrophobic phase mixes with the droplets, it will drain like a liquid so that it can be readily collected and removed from the system. With preferential arrangements as described in this document below, the mixer or mixer / separator, especially with the oil phase loaded, in part, in it, operates as a filter for other contaminants (such as carbon contaminant) carried in the gas stream. In fact, in some systems, as the oil is drained from the system, this will provide some self-cleaning of the mixer due to the fact that the oil will carry a portion of the trapped carbon contaminant in it.
[0057] [0057] The principles according to the present disclosure can be implemented in single-stage or multi-stage arrangements. It has been found, in one embodiment, that two or more layers of filter media of that description can be combined into one element. Two or more similar or identical media can be combined in a filtering structure for further improvement in filtration. Alternatively, two substantially dissimilar means can be used to combine different types and amounts of filtration. The media can be dissimilar in any operational characteristic, including pore size, permeability, efficiency, thickness, composition materials, etc. In one embodiment, a loading layer (with pore sizes larger than the efficiency layer) and an efficiency layer can be used, each of said layers having different structures and filtration properties, to form a composite layer. The loading layer is followed in a fluid path by an efficiency layer. The efficiency layer is a highly efficient layer (in comparison to the loading layer) that has adequate porosity, efficiency, permeability and other filtration characteristics to remove any harmful particulate from the fluid stream as the fluid passes through the filter structure. The loading filtration media of the invention has a basis weight of about 30 to about 100 g-m-2. The efficiency layer has a base weight of about 40 to about 150 g-m-2. The loading layer has an average pore size of about 5 to about 30 micrometers. The efficiency layer has a smaller pore size than the loading layer which is in the range of about 0.5 to about 3 micrometers. The loading layer has a permeability in the range of about 50 to 200 feet-min-1 or 15.2 to 61 m-min-1. The efficiency layer has a permeability of about 5 to 30 feet-min-1 or 1.52 to 9.14 m-min-1. The loading layer or the efficiency layer of the invention has a wet snatch resistance greater than about (3.515E-1 kg / cm2) 5 pounds-inches-2, typically about greater than 34.4 kPa or 69 to 172 kPa (10 to about 25 pound-inches-2). The combined filtration layer has a permeability of about 1.2 to 6.4 m-min-1 (4 to 20 feet-min-1); a wet snatch resistance of 69 to 138 kPa (10 to 20 pound-inches-2) and a base weight of 100 to 200 g-m-2
[0058] [0058] Briefly, the fibers can be of a variety of compositions, diameters and aspect ratios. The concepts described in this document for forming useful media in a non-woven blanket are independent of the particular fiber stock used to create the blanket. For the compositional identity of the fiber, the converse may find numerous useful fibers. Such fibers are usually processed from organic or inorganic products. The requirements of the specific application for the media may make a choice of fibers, or combination of fibers, more appropriate. The media fibers may comprise bicomponent, cellulose, hemp, abacus, a polyolefin, polyester, a polyamide, a halogen polymer, polyurethane, acrylic or a combination thereof. Binder resins can be used to assist in bonding fibers to a blanket or mechanically stable medium, typically in the absence of two-component fiber. Such binder resin materials can be used as a solvent or dry powder system, but are typically aqueous dispersions (latex or a number of latexes) of thermoplastic vinyl resins. Sizing additives, fillers, colors, retention aids, recycled fibers from alternative sources, binders, adhesives, lattices, particles or antimicrobial agents can be added to the aqueous dispersion.
[0059] [0059] Somehow in greater detail, bicomponent fibers are typically fibers made from two polymer components. The polymer components comprise a lower melting point thermoplastic polymer and a higher melting point structural polymer. Such two-component fibers can be "core / shell" fibers or "side-by-side" fibers or "multi-lobe" fibers. Two-component fibers operate by supplying, for example, blade fiber that has a melting point such that , during the thermal forming process, the fiber is heated to a temperature such that the lower melting point polymer can melt and bond to an intact mat. Typically, the higher melting point polymer is the material that provides structural integrity to the mat and does not melt at thermal bond temperatures or temperatures of use. In the blankets or media described in this document, the blankets comprise a two-component fiber and a second optional two-component fiber. , a coating-core structure. The preferred bicomponent fiber of the invention has a higher melting point characteristic ie the smaller melting point polymer of the bicomponent fiber has a melting point. use of at least 100 ° C, 120 ° C and, more preferably, at least about 140 ° C and, most preferably, from about 140 to 160 ° C; while the higher melting point polymer of the bicomponent fiber has a melting point of at least 235 ° C or about 240 to 260 ° C. The optional two-component fiber has a lower melting point characteristic, with the lower melting point of the binder polymer of the two-component fiber lower than that of the high temperature fiber and can be in the range of about 70 to 115 ° C and the polymer higher melting point of bicomponent fiber has a melting point greater than 200 ° C and about 240 to 260 ° C. In addition, the bicomponent fibers can be thoroughly mixed and evenly dispersed with the short fiber, pulp or cotton fibers.
[0060] [0060] In preferred embodiments, bicomponent fibers typically have a fiber diameter of about 5 to 50 micrometers, often about 10 to 20 micrometers, and typically, in a fiber form, have a length of 0.1 to 20 millimeters or are often about 0.2 to about 15 millimeters long. Such fibers can be manufactured from a variety of thermoplastic materials including polyolefins (such as polyethylenes, polypropylenes); polyesters (such as polyethylene terephthalate, PET, polybutylene terephthalate, PBT); nylon including nylon 6, nylon 66, nylon 612, etc. Any thermoplastic material that can have an appropriate melting point can be used in the bicomponent fiber although higher melting point polymers can be used in the higher melting point portion of the fiber. The bicomponent fiber may have (for example) a structure of PET / PET or nylon 6 / nylon 66 with PET / components from different melting points or nylon. The cross-sectional structure of such fibers can be, as discussed above, the "side-by-side" or "core-coat" structure or other structures that provide the same thermal bonding function. tips have a lower melting point polymer The relatively low molecular weight polymer of the bicomponent fiber can melt under conditions of blade formation, media or filter to act on the bonding of the bicomponent fiber, and other fibers present in the blade fabric , media or filter on a blade, mechanically stable media or filters.
[0061] [0061] Two-component fibers (for example, core / shell or coating and tile) can be made from similar or different thermoplastic materials, such as, for example, two-component polyolefin / polyester fibers (re-coating / core) through which the polyolefin, for example, polyethylene coating, melts at a temperature lower than the core, for example, polyester or polyester / polyester or nylon / nylon materials. Typical thermoplastic polymers include polyolefins, for example, polyethylene, polypropylene, polybutylene and glass-polymers thereof; polytetrafluoroethylene; polyesters, for example, polyethylene terephthalate; vinyl acetates, for example, polyvinyl acetate, polyvinyl chloride acetate; polyvinyl butyral; acrylic resins, for example, polyacrylate, and polymethylcrylate, polymethylmethacrylate; polyamides, namely, nylon; polyvinyl chloride, polyvinylidene chloride; polystyrene; polyvinyl alcohol; polyurethanes; cellulosic resins, namely, cellulosic nitrate, cellulosic acetate, cellulosic acetate butyrate, ethyl cellulose, etc .; copolymers of any of the above materials, for example, ethylene vinyl acetate copolymers, ethylene-acrylic acid copolymers, styrene-butadiene block copolymer, Kraton rubbers and the like.
[0062] [0062] Particularly preferred in the fiber media described in this document is a two-component fiber known as 271P available from DuPont. Other fibers include FIT 201, Kuraray N720 and Nichimen 4080 and similar materials. These fibers demonstrate the binding characteristics of the coating to the coating polymer upon completion of the first melt. A preferred fiber is a PET core fiber / PET coating. Typical CCV operating temperatures are in the range of about 75 to 175 ° C.
[0063] [0063] Medium fibers are fibers that can assist in filtering or forming a layer of structural media. Such fiber is made of numerous hydrophilic, hydrophobic, oleophilic and oleophobic fibers. These fibers cooperate with the binder, the secondary fiber and the bicomponent fiber to form mechanically stable but strong permeable filtration media that can withstand the mechanical stress of the passage of fluid materials and can maintain particulate loading during use. Such fibers are typically single-component fibers with a diameter in the range of about 0.1 to about 50 micrometers and can be manufactured from a variety of materials including naturally occurring cotton, linen, wool, various cellulosic fibers and natural proteinaceous , synthetic fibers including rayon, acrylic, aramid, nylon, polyolefin, polyester fibers. A type of secondary fiber is a binder fiber that cooperates with other components to attach materials to a blade. Another type of structural fiber cooperates with other components to increase the resistance to traction and the snatching of materials under dry and humid conditions. In addition, the binder fiber may include fibers made from such polymers as polyvinyl chloride and polyvinyl alcohol. Secondary fibers can also include inorganic fibers such as carbon / graphite fiber, metal fiber, ceramic fiber and combinations thereof. Depending on the application, the media or medium can comprise a wide variety of secondary binder fiber amounts. The amounts used in different examples of media can be 0.1 to 10% by weight.
[0064] [0064] Cotton is a soft, fuzzy textile fiber that grows in a cocoon around the seeds of the cotton plant. Cotton is essentially 95% cellulose combined with other non-cellulosic components including natural waxes, proteins and other biological materials. The cotton fiber from typical grown cotton materials is divided into two groups. Cotton fibers can be considered as "down" or "linter or liners". The biggest difference between down, cotton and linter cotton is the length with pigmentation and resistance. Cotton down fibers are similar to linter fibers, except that they are typically 0.33 cm compared to the average 2.5 cm length of linter fibers. Down fibers tend to be about 30 to 40 microns thick, while linter fibers tend to be about 30 microns or less. Linter fibers are also distinguished from down fibers since linter fibers tend to be produced close to close seeds and are typically removed last in the fiber making process. Cotton fluff fiber and cotton lint fiber are standard commercial products from cotton mills and can be obtained from a variety of sources including Buckeye and Southern Cellulose. Cotton linters are fine silky fibers that adhere to the seeds of the cotton plant after ginning. These corrugated fibers are typically less than 3 mm in length. The term also applies to textile lint from textile fiber as well as to the shortest down fibers of some species of the plateau. Liners are traditionally used in the manufacture of paper and as a raw material in the manufacture of cellulose. Liners are often called "cotton wool." This can also be a refined product (absorbent cotton in use in the USA) that has medical, cosmetic and many other practical uses. Preferred cotton liners have the following characteristics: length less than 5 mm or about 0.5 to 4 mm, diameter less than 80 microns or about 15 to 55 microns.
[0065] [0065] An important aspect of the means described in this document that comprise cotton is the property that, when combined with a two-component fiber, cotton linters substantially improve the manufacturing success, the speed and the productivity of the wet spinning processes and a damp textile layer.
[0066] [0066] Textile thermoplastic fibers include, but are not limited to, polyester fibers, polyamide fibers, polypropylene fibers, copolyether ester fibers, polyethylene terephthalate fibers, polybutylene terephthalate fibers, polyether ketone fibers ( PEKK), polyether ether ketone fibers (PEEK), liquid crystalline polymer fibers (LCP) and mixtures thereof. Polyamide fibers include, but are not limited to, nylon 6, 66, 11, 12, 612, and high temperature "nylon" (such as nylon 46) including cellulosic fibers, polyvinyl acetate fibers, polyvinyl alcohol (including several polyvinyl alcohol hydrolysis as polymers 88% hydrolyzed, 95% hydrolyzed, 98% hydrolyzed and 99.5% hydrolyzed), cotton, viscose rayon, thermoplastic material like polyester, polypropylene, polyethylene, etc., polyvinyl acetate, polylactic acid and other types of common fiber. Thermoplastic fibers are generally thin (about 0.5 to 20 denier in diameter), short (about 0.1 to 5 cm long), textile fibers, possibly containing pre-formulated conventional additives, such as antioxidants, stabilizers, lubricants, stiffeners, etc. In addition, the thermoplastic fibers can have the surface treated with a dispersing aid. Preferred thermoplastic fibers are polyamide and polyethylene terephthalate fibers, with the highest preference for polyethylene terephthalate fibers.
[0067] [0067] Binder resins can be used to help bond the fiber to a mechanically stable media layer. Such thermoplastic binder resin materials can be used as a solvent or dry powder system, but are typically aqueous dispersions (a latex or a number of latexes) of vinyl thermoplastic resins. A resinous binder component is not necessary to obtain adequate resistance to the media, but it can be used. The resin used as a binder can be in the form of a water-soluble or dispersible polymer added directly to the media blanket manufacturing dispersion or in the form of thermoplastic binder fibers of the resin material mixed with the aramid and textile fibers or media to activated as a heat binder applied after the media blanket is formed. Resins include vinyl acetate materials, vinyl chloride resins, polyvinyl alcohol resins, polyvinyl acetate resins, polyvinyl acetyl resins, acrylic resins, methacrylic resins, polyamide resins, polyethylene vinyl acetate resins, thermosetting resins such as phenol urea, formaldehyde urea, melamine, epoxy, polyurethane, curable unsaturated polyester resins, polyaromatic resins, resorcinol resins and similar elastomer resins. The preferred materials for the water-soluble or dispersible binder polymer are water-soluble or water-dispersible thermoset resins such as acrylic resins, methacrylic resins, polyamide resins, epoxy resins, phenolic resins, polyureas, polyurethanes, formaldehyde melamine resins, polyester and alkyd resins, generally and specifically, water-soluble acrylic resins, methacrylic resins, polyamide resins, which are in common use in the papermaking industry. Such binder resins typically coat the fiber and adhere fiber to the fiber in the final non-woven matrix. Sufficient resin is added to the paste to completely coat the fiber without causing film on the pores formed in the blade material, media or filter. The resin can be added to the pulp during papermaking or can be applied to the media after formation.
[0068] [0068] A latex binder can be used to improve the module or rigidity, but it is not preferred, since its use in a paste can reduce permeability. The latex binder, if used to bond the three-dimensional non-woven fiber mat together in each non-woven layer or used as the additional adhesive, can be selected from various latex adhesives known in the art. The expert can select the particular latex adhesive depending on the type of cellulosic fibers to be bonded. The latex adhesive can be applied by techniques known as spraying or foaming. In general, latex adhesives that have 15 to 25% solids are selected when using a latex binder. The dispersion can be manufactured by dispersing the fibers and then adding the binder material or dispersing the binder material and then adding the fibers. The dispersion can also be manufactured by combining a fiber dispersion with a dispersion of the binder material. The non-woven media described in this document may contain secondary fibers made from numerous hydrophilic, hydrophobic, oleophilic and oleophobic fibers. These fibers cooperate with the textile or media fiber and the bicomponent fiber to form mechanically stable but strong permeable filtration media, which can withstand the mechanical stress of the passage of fluid materials and can maintain particulate loading during use. Secondary fibers are typically monocomponent fibers with a diameter in the range of about 0.1 to about 50 microns and can be manufactured from a variety of materials including naturally occurring cotton, linen, wool , various natural cellulosic and proteinaceous fibers, and synthetic fibers including rayon, acrylic, aramid, nylon, polyolefin and polyester fibers. A type of secondary fiber is a binder fiber that cooperates with other components to attach materials to a blade. Another type of secondary fiber is a structural fiber that cooperates with other components to increase the tensile and snatch resistance of materials under dry and wet conditions. In addition, the binder fiber may include fibers made from such polymers as polyvinyl chloride, polyvinyl alcohol. Secondary fibers can also include inorganic fibers such as carbon / graphite fiber, metal fiber, ceramic fiber and combinations thereof.
[0069] [0069] The fluoro-organic treatments useful in this invention are polymeric or small organic molecules that have one or more fluoroaliphatic radicals C2-7. The radical is a fluorinated, monovalent, aliphatic organic radical containing at least two carbon atoms. Preferably, it is a saturated perfluoroaliphatic monovalent organic radical. However, hydrogen or chlorine atoms can be present as substituents on the structural chain. Although radicals containing a large number of carbon atoms can function properly, compounds containing no more than about 20 carbon atoms are preferred since larger radicals usually represent less effective use of fluorine than is possible with smaller structural chains. The treatment composition can comprise a small molecule or a polymeric composition in combination with typical additive materials. The treatment composition can be used to prepare the paste or to treat the dry or wet blanket after formation.
[0070] [0070] The cationic groups that are usable in the fluoro-organic treatments employed in this invention may include an amine or a quaternary ammonium cationic group that can be oxygen-free (for example, -NH2) or contain oxygen (for example, amine oxides). Such cationic hydrophilic groups of quaternary ammonium and amine can have formulas such as -NH2, - (NH3) X, - (NH (R2) 2) X, - (NH (R2) 3) X, or -N (R2) 2 ➝O, where x is an anionic counterion such as halide, hydroxide, sulfate, bisulfate or carboxylate, R2 is H or C1-18 alkyl group, and each R2 may be the same or different from other R2 groups Preferably, R2 is H or a C1-16 alkyl group and X is halide, hydroxide, or bisulfate.
[0071] [0071] The anionic groups that are usable in the fluoro-organic treatments employed in this invention include groups that, by ionization, can become radicals of anions. Anionic groups can have formulas such as -COOM, -SO3M, -OSO3M, -PO3HM, -OPO3M2 or -OPO3HM, where M is H, a metal ion, (NR14) + or (SR14) +, where each R1 is independently H or substituted or unsubstituted C1-C6 alkyl. Preferably, M is Na + or K +. The preferred anionic groups of the fluoro-organic treatments used in this invention have the formula -COOM or -SO3M. Included in the group of anionic fluoro-organic treatments are anionic polymeric materials typically manufactured from ethylenically unsaturated mono-monomers and diacids that have pendent fluorocarbon groups attached to them. Such materials include surfactants obtained from 3M Corporation known as FC-430 and FC-431.
[0072] [0072] Fluoro-organic treatments can be used in the media. Amphoteric groups that are usable in the fluoro-organic treatment employed in this invention include groups that contain at least one cationic group as defined above and at least one anionic group as defined above.
[0073] [0073] The non-ionic groups that are usable are in the fluoro-organic treatments employed in this invention include groups that are hydrophilic but which, under pH conditions of normal agronomic use, are not ionized. Nonionic groups may not have formulas such as -O (CH2CH2) xOH where x is greater than 1, -SO2NH2, -SO2NHCH2CH2OH, -SO2N (CH2CH2H) 2, -CONH2, - CONHCH2CH2OH or -CON (CH2CH2OH) 2. Examples of such materials include materials of the following structure: F (CF2CF2) n-CH2CH2O- (CH2CH2O) mH where n is 2 to 8 and m is 0 to 20.
[0074] [0074] Other fluoro-organic treatments include those cationic fluorochemicals described, for example, in US Patent Nos. 22 2,764,602; 2,764,603; 3,147,064 and 4,069,158. Such amphoteric fluoro-organic treatments include those amphoteric fluorochemicals described, for example, in US Patent Nos. 2,264,602; 4,042,522; 4,069,158; 4,069,244; 4,090,967; 4,161,590 and 4,161,602. Such anionic fluoro-organic treatments include those anionic fluorochemicals described, for example, in US Patent No. 2,803,656; 3,255,131; 3,450,755 and 4,090,967.
[0075] [0075] The fluoro-organic agents useful in this invention for addition to the fiber layers are C2-7 fluoro-organic molecules. Preferably, it is a chemical substance with a saturated perfluoroaliphatic organic group. However, hydrogen or chlorine atoms can be present as substituents on the structural chain.
[0076] [0076] Examples of such materials are the non-ionic surfactants DuPont Zonyl FSN and DuPont Zonyl FSO. Another aspect of additives that can be used in the polymers of the invention include low molecular weight fluorocarbon acrylate materials such as 3M Scotchgard material which has the general structure: CF3 (CX2) n-acrylate where X is -F or -CF3 and n is 1 to 7.
[0077] [0077] The preferred fluoropolymer of the invention is a polymer composition comprising a repeating unit polymer comprising a Formula I residue:
[0078] [0078] The fluoroalkyl Af groups of the present invention are preferably C2-6 fluoroalkyl, and more preferably C4-6 fluoroalkyl groups. The fluoroalkyl groups are optionally, but preferably, perfluoroalkyl (that is, all fluorine-substituted hydrogens). Fluoroalkyl groups can contain one or two heteroatoms selected from N and O, examples of which include, but are not limited to: -A f1; -O — A f2; —Af1 — NA f2A f3; -Af1 — O — Af 2 (—Af3) m — NAf4Af5, where Af1, Af2, Af3, Af4 and Af5 are each perfluoroalkyl independently; where A can be - (CF2) x — CF3, where m is defined above.
[0079] [0079] Each R1 is independently H or halo (preferably fluoro-); T is —O— or a covalent bond; n is a characteristic number of acrylic polymers; m is 0 or 1 or 2; x is 1 to 5; x + x 'is 2 to 10; and x + x '+ m is not greater than 10.
[0080] [0080] Polymers can be a characteristic n of acrylic polymers and can have any suitable molecular weight, for example, from 1,000 or 2,000 to 5,000 or, in some embodiments, 1,000 to 50,000 or 100,000 or more.
[0081] [0081] The suitable comonomer (usually compounds unsaturated in an ethylenic way) that can be used for the comonomer that contains the hydrophobic group or the comonomer that contains the linking group includes unsaturated compounds in ethylene with the ability to copolymerize. with a (meth) acrylic acid. Examples include ethylene, vinyl acetate, vinyl chloride, vinylidene halide, (meth) acrylic acid, (meth) acrylonitrile, styrene, alfamethylstyrene, p-methylstyrene, (meth) acrylamide, (meth) N-methylol acrylamide, ( meth) hydroxymethyl acrylate, (meth) hydroxyethyl acrylate, (meth) hydroxypropyl acrylate, (meth) 3-chloro-2-hydroxypropyl acrylate, (meth) polyethylene glycol acrylate, (meth) polypropylene glycol acrylate, ( met) methoxypolyethylene glycol acrylate, (meth) methoxy polypropylene glycol acrylate, (met) N, N-dimethylaminoethyl acrylate, (meth) N, N-diethylaminoethyl acrylate, (glycidyl acrylate), (meth) tetrahydrofurfuryl acrylate , benzyl (meth) acrylate, phenoxyethyl (meth) acrylate, dicyclopentenyl (meth) acrylate, hydroxypropyltrimethylammonium chloride methacrylate, ethyltrimethylammonium chloride methacrylate, alkyl vinyl ether halide, isoprene ethylene halide, butadiene , maleic anhydride, (meth) acrylates, (with non-fluoro groups, represented by the general formula (Formula 4)): CH2 = CA1CO2-alkyl (Formula 4) [where A1 represents a hydrogen atom or a methyl and alkyl group represents an alkyl group represented by CmH2m + 1 (m represents an integer from 1 to 30)]; fluorosulfonate compounds (monomers that contain sulfonic acid).
[0082] [0082] One embodiment of the invention combines a fluorochemical compound with an urethane compound. Such materials of the invention can be formed by reacting (a) a larger di, tri or isocyanate with a reactive fluorochemical monofunctional compound and (b) optionally with a limited amount of an aliphatic monofunctional compound. The reaction can be carried out according to well-known technologies such as, for example, by condensing a suitable solvent such as methyl isobutyl ketone (MIBK) using a small amount of a dibutyltin dilaurate catalyst. The urethane compound, formed in such a way, can be emulsified in water or dissolved in an organic solvent and can optionally be combined with one or more suitable surfactants that can be used to stabilize the emulsion.
[0083] [0083] Preferred aliphatic isocionates that have at least three isocyanate functionalities can be used in the preparation of the fluorochemical polymer. Representative examples of polyfunctional isocyanate compounds include functional isocyanate derivatives of polyfunctional isocyanate compounds as defined herein. Examples of derivatives include, but are not limited to, those selected from the group consisting of ureas, biurets, allophanates, dimers and trimers (such as uretdiones and isocyanurates) of isocyanate compounds and mixtures thereof. Any suitable organic polyisocyanate, such as an aromatic, alicyclic or aliphatic polyisocyanate can be used either individually or in mixtures of two or more. Aliphatic polyfunctional isocyanate compounds provide better light stability than aromatic compounds.
[0084] [0084] Examples of useful cycloaliphatic polyfunctional isocyanate compounds include, but are not limited to, those selected from the group consisting of dicyclohexylmethane diisocionate (H12MDI, commercially available as DesmodurTMW, available from Bayer Corporation, Pittsburgh, Pa., USA), 4,4'-isopropyl-bis (cyclohexylisocyanate), isoformone diisocyanate (IPDI), cyclobutane-1,3-diisocyanate, cyclohexane 1,3-diisocyanate, cyclohexane 1,4-diisocyanate (CHDI), 1,4-cyclohexanobis (methylene isocyanate) (BDI), 1,3-bis (isocyanatomethyl) cyclohexane (H6XDI), 3-isocyanatomethyl-3,5,5-trimethylcyclohexyl isocyanate and mixtures thereof.
[0085] [0085] Examples of useful aliphatic polyfunctional isocyanate compounds include, but are not limited to, those selected from the group consisting of 1,4-tetramethylene diisocyanate, 1,4-diisocyanate hexamethylene, hexamethylene 1,6-diisocyanate (HDI ), 1,12-dodecane diisocyanate, 2,2,4-trimethylhexamethylene diisocyanate (TMDI), 2,4,4-trimethylhexamethylene diisocyanate (TMDI), 2-methyl-1,5- diisocyanate pentamethylene, dimer diisocyanate, hexamethylene diisocyanate urea, hexamethylene 1,6-diisocyanate biuret (HDI) (available as Desmodur ™ N-100 and N-3200 from Bayer Corporation, Pittsburgh, Pa., USA), HDI isocyanurate (available as Demodur ™ N-3300 and Desmodur ™ N-3600 from Bayer Corporation, Pittsburgh, Pa., USA), a blend of HDI isocyanurate and HDI urethane (available as Desmodur ™ N-3400 available from Bayer Corporation, Pittsburgh, Pa., USA) and mixtures thereof.
[0086] [0086] Suitable commercially available polyfunctional isocyanates are exemplified by Desmodur ™ N-3200, Desmodur ™ N-3300, Desmodur ™ N-3400, Desmodur ™ N-3600, Desmodur ™ H (HDI) and Desmodur ™ N-100, each one available from Bayer Corporation, Pittsburgh, Pa., USA.
[0087] [0087] Other useful triisocyanates are those obtained by reacting three moles of a diisocyanate with one mole of a triol. For example, toluene diisocyanate, 3-isocyanatomethyl-3,4,4-trimethylcyclohexyl isocyanate or m-tetramethylxylene diisocyanate can be reacted with 1,1,1-tris (hydroxymethyl) propane to form triisocyanates. The reaction product with m-tetramethylxylene diisocyanate is commercially available as CYTHANE 3160 (American Cyanamid, Stamford, Conn., USA).
[0088] [0088] Due to their widespread commercial availability, isocyanurates and bi-rectals with functional polyisocyanate derived from the homopolymerization of hexamethylene diisocyanate are preferred for use according to this invention. Such compounds are solid, for example, under the trademark Desmodur, whose products are available from Miles Corp.
[0089] [0089] The Isocyanate group that remains after the reaction with the monofunctional fluorochemical compound (s) and the aliphatic monofunctional compound (s) can be optionally blocked isocyanate groups. By the term "blocked isocyanate" is meant a (poly) isocyanate among which the isocyanate groups have been reacted with a blocking agent. Isocyanate blocking agents are compounds that, upon reaction with an Isocyanate group, yield a group that is non-reactive at room temperature with compounds that, at room temperature, normally react with an isocyanate whose group, however, reacts at elevated temperature with reactive isocyanate compounds. Generally, at high temperature, the blocking group will be released from the blocked (po-li) isocyanate compound, thereby generating the Isocyanate group again which can react with a reactive isocyanate group. Blocking agents and their mechanisms have been described in “Blocked isocyanates III .: Part. A, Mechanisms and chemistry ”by Douglas Wicks and Zeno W. Wicks Jr., Progress in Organic Coatings, 36 (1999), pages 14 to 172.
[0090] [0090] The blocked isocyanate is generally a blocked di or triisocyanate or a mixture thereof and can be obtained by reacting an isocyanate with a blocking agent that has at least one functional group with the ability to react with an Isocyanate group. Preferred blocked isocyanates are blocked polyisocyanates that, at a temperature of less than 150 ° C, have the ability to react with a reactive isocyanate group, preferably by unblocking the blocking agent at an elevated temperature known for the blocked material. Preferred blocking agents include aryl alcohols such as phenols, lactams such as ε-caprolactam, δ-valerolactam, γ-butyrolactam, oximes such as formaldoxime, acetaldoxime, methyl ethyl ketone oxime, cyclohexone ninth oxime, acetophenone oxime, oxime oxime benzophenone, 2-butanone oxime or diethyl glyoxime. Additional suitable blocking agents include bisulfite and triazoles.
[0091] [0091] The blade media described in this document are typically made using papermaking processes. Such wet spinning processes are particularly useful and many of the fiber components are designed for aqueous dispersion processing. However, the means can be made by air-spinning processes that use similar components adapted for air-processing.
[0092] [0092] Machines used in the production of wet spinning blades include manual spinning blade equipment, Fourdrinier papermaking machines, cylindrical papermaking machines, inclined papermaking machines, papermaking machines combination paper and other machines that can receive a properly mixed paper, form a layer or layers of the paste components, remove the fluid aqueous components to form a wet blade. A fiber slurry containing the materials is typically mixed to form a relatively uniform diluted fiber slurry (0.05 to 5% by weight). The fiber slurry is then subjected to a wet spinning paper production process. Once the slurry is formed on a wet sheet, the wet sheet can then be dried, cured or otherwise processed to form a permeable filter or media, but with a real sheet . Once sufficiently dry and processed in filter media, the blades are typically about 0.25 to 2 millimeters in thickness, with a basis weight of about 20 to 200 or 30 to 150 g / m2. For a commercial scale process, the Bicomponent bases are generally processed using machines of the commercially available inclined table paper production type such as cylinder, Stevens former, Roto former, Inver former, Venti former and Inclined Delta former machines. Preferably, an inclined Delta Forming machine is used.
[0093] [0093] A two-component paste used to make the layer or blanket can be prepared by forming pulp and textile or media slurries and combining the slurries in mixing tanks, for example. The amount of water used in the process can vary depending on the size of the equipment used. The slurry, however, is typically well diluted and can be greater than 90, 95 or 99.5 to 99.9% by weight of water. The paste can be passed into a conventional inbox where it is dehydrated and deposited on a moving metal screen where it is dehydrated by suction or vacuum to form a two-component non-woven blanket. The mat can then be coated with a binder by conventional means, for example, by a method of flooding and extraction and passed through a drying section that dries the base and cures the binder and thermally binds the blade, the media or the filter. The resulting base can be collected on a rocket.
[0094] [0094] The medium or media can be formed on the substantially flat sheets or formed in a variety of geometric shapes using shapes to retain the wet composition during thermal bonding. The medium fiber of the invention can include metal, polymer and other related fibers. In the formation of shaped medium, each layer and filter is formed by dispersing fibers in an aqueous system and forming the filter in a mandrel with the help of a vacuum. The formed structure is then dried and connected in an oven. Using a slurry to form the filter, this process provides the flexibility to form various structures; such as tubular, conical and oval cylinders.
[0095] [0095] Certain preferential provisions include filter media as defined generally in a general filter construction. Some preferred arrangements for such use include the medium arranged in a pleated and cylindrical configuration in which the pleats extend generally longitudinally, that is, in the same direction as a longitudinal geometric axis of the cylindrical pattern. For such arrangements, the media can be embedded in end caps, as well as with conventional filters. Such arrangements may include upstream and downstream coatings, if desired, for typical conventional purposes.
[0096] [0096] Permeability refers to the amount of air (feet3-min-1- feet-2) feet-min-1 that will flow through a filter medium at a pressure drop of 1.27 centimeters (0.5 inches) of water. In general, permeability, as the term is used and evaluated by the Frazier Permeability Test according to ASTM D737 using a Frazier Permeability Test Equipment available from Frazier Precision Instrument Co. Inc., Gaithersburg, Md. Or a TexTest 3300 or TexTest 3310 available from Advanced Testing Instruments Corp (ATI), 243 East Black Stock Rd. Room 2, Spartanburg, SC 29301, (864) 989-0566, www.aticorporation.com. The pore size referred to in this disclosure medium flow pore diameter determined using a capillary flow porometer instrument such as the Model APP 1200 AEXSC sold by Porus Materials, Inc., Cornell University Research Park, Bldg. 4.83 Brown Road, Ithaca, NY, USA.
[0097] [0097] Preferred crankcase ventilation filters typically have the media blade obtained by wet spinning in at least one overlapping, wrapped or coiled media stage, usually in multiple layers, for example, in a tubular form, in a useful cartridge. When in use, the useful cartridge would be positioned with the medium stage oriented for convenient vertical drainage. For example, if the media is in a tubular shape, the media would typically be oriented with a central longitudinal geometric axis generally vertically.
[0098] [0098] As indicated, multiple layers, from multiple wraps or windings, can be used. A gradient can be provided at a medium stage by first applying one or more layers of media obtained by wet spinning of the first type and then applying one or more layers of media (typically media obtained by wet spinning) from a second optionally different type. Typically, when a gradient is provided, the gradient involves the use of two types of media that are selected for differences in efficiency. This is discussed below.
[0099] [0099] In the exemplary arrangement described above, an optional first stage and a second stage are described. The means obtained by wet spinning according to the present description can be used at any stage. However, typically the media would be used in a stage that forms stages of tubular media. In some instances, when the materials according to the present disclosure are used, the first media stage, CHARACTERIZED as the optional first stage above, can be avoided entirely, to your advantage.
[0100] [00100] The composition of wet media slides used to form a stage in a filter is provided in a form that has a calculated pore size of at least 10 microns, usually at least 12 microns. The pore size is typically less than 60 microns, for example, within the range of 12 to 50 microns, typically 15 to 45 microns. The media are formulated to have a DOP percentage efficiency (at 10.5 fpm for 0.3 micron particles), within the range of 3 to 18%, typically 5 to 15%.
[0101] [00101] The media may comprise 30% by weight, typically at least 40% by weight, often at least 45% by weight and generally within the range of 45 to 70% by weight, based on the total weight of filter material within the bicomponent blade fiber material according to the general description provided in this document. The media comprises 30 to 70% (typically 30 to 55%), by weight, based on the total weight of fiber material within the blade, of textile or secondary fiber material that has median cross-sectional dimensions (median diameters are round) of at least 1 micron, for example within the range of 1 to 20 microns. In some instances the diameter will be 8 to 15 microns. Average lengths are typically 1 to 20 mm, often 1 to 10 mm, as defined. This secondary fiber material can be a mixture of fibers. Typically polyester and / or textile or medium fibers are used, although alternatives are possible.
[0102] [00102] Typically and preferably, the fiber sheet (and resulting media stage) includes no binders added in addition to the binder material contained within the bicomponent fibers. If an added resin or binder is present, it is preferably present at no more than about 7% by weight of the total fiber weight, and more preferably no more than about 3% by weight of the total fiber weight.
[0103] [00103] Typically and preferably, the means obtained by wet spinning are made with a base weight of at least 33 g / m2; 9 kg / 278.7 m2 (20 pounds per 3,000 square feet) and typically no more than 195 g / m2; 54.5 kg / 278.7 m2 (120 pounds per 3,000 square feet). They will generally be selected within the range of 49 to 163 g / m2; 14 kg to 45.4 kg / 278.7 m2 (30 to 100 pounds per 3,000 square feet). Typically and preferably, the means obtained by wet spinning are made at a Frazier permeability (meters per minute) of 12 to 153 meters / min (40 to 500 feet per minute), typically 30 meters / minutes (100 feet per minute) . For base weights in the range of about 18 to 45.4 kg / 278.7 m2 (40 to 100 pounds / 3,000 square feet), typical permeabilities would be about 92 to 184 meters / minute (300 to 600 feet per minute ). The thickness of the media blade (s) obtained by wet spinning used to later form the medium stage described in the filter at 8.6 millibars (0.125 psi) will typically be at least 0.25 mm ( 0.01 inch) often on the order of about 0.45 to 1.53 mm (0.018 inch to 0.06 inch); typically 0.45 to 0.76 mm (0.018 to 0.03 inch).
[0104] [00104] The media according to the general definitions provided in this document, including a mixture of bicomponent fiber (s) and textile or media fiber (s), can be used as any stage of media in a filter according to generally described above. Typically and preferably, they will be used to form the tubular stage. When used in this way, they will be wrapped in a central core of the filtering structure, in multiple layers, for example, often at least 5 to 20 layers and typically 20 to 70 layers, although alternatives are possible. Typically, the total depth of the wrap will be about 6 to 51 mm (0.25 to 2 inches), usually 12.7 to 38.1 mm (0.5 to 1.5 inches) depending on the overall efficiency desired. Typically, sufficient media slides would be used in the final media stage to provide the media stage with efficiency thus measured at least 70%, at least 85% and typically 90% or more. In some instances, it would be preferable to have efficiency at 95% or more. In the context, the term "final medium stage" refers to a stage that results from the wrapping or winding of the media blade (s) obtained by wet spinning.
[0105] [00105] In crankcase ventilation filters, a pore size calculated within the range of 12 to 80 microns is generally useful. Typically, the pore size is within the range of 15 to 45 microns. Often, the portion of the media that first receives gas flow with entrained liquid for designs featured in the drawings, the portion adjacent to the inner surface of the tubular medium construction, through a depth of at least 6.4 mm (0.25 inches) , has a median pore size of at least 20 microns. This is due to the fact that in this region a first higher percentage of coalescence / drainage will occur. In outer layers, where less coalescent drainage occurs, a smaller pore size for more efficient filtration of solid particles may be desirable in some instances. The term pore size X-Y and variants thereof when used in this document should be understood as referring to the theoretical distance between fibers in filter media. X-Y refers to the surface direction versus the Z direction which is the thickness of the media. The calculation assumes that all fibers in the media are aligned parallel to the surface of the media, equally separated and arranged as a square when viewed in cross-section perpendicular to the length of the fibers. The X-Y pore size is a distance between the fiber surface in the opposite pipes of the square. If the media is composed of fibers of various diameters, the mean d2 of the fiber is used as the diameter. The mean d2 is the square root of the median of the squared diameters. It has been found that it is useful to have calculated pore sizes at the highest end of the range, typically 30 to 50 microns, when the medium stage in question has a total vertical height in the crankcase ventilation filter of less than 178 mm (7 inches) ); and, pore sizes at the small end, about 15 to 30 microns, are sometimes useful when the filter cartridge has a height at the long end, typically 178 to 305 mm (7 to 12 inches). Larger filter stages can provide a higher liquid top during coalescence, which can force the flow of coalesced liquid, by gravity, down through smaller pores, during drainage. Smaller pores allow for greater efficiency and fewer layers. In a typical operation where the same media stage is being built for use in a variety of filter sizes, typically for at least a portion of the media obtained by wet spinning used for coalescence / drainage at initial separation, a size median pore size of about 30 to 50 microns will be useful.
[0106] [00106] Solidity is the volume fraction of media occupied by fibers expressed as a percentage of volume (%). It is the ratio of the volume of the fibers per unit of mass divided by the volume of the media per unit of mass. Typical wet spinning materials preferred for use in medium stages according to the present disclosure, especially as the medium tubular medium stage in arrangements such as those described above in connection have a solidity percentage of 8.6 millibars ( 0.125 psi) of less than 10% and typically less than 8%, for example 6 to 7%. The thickness of the media used to make the media packs according to the present disclosure is typically measured using a dial indicator such as an Ames # 3W (BCA Melrose MA, USA) equipped with a 2, 54 cm2 (one square inch). A total of 56.7 g (2 ounces) of weight is applied along the presser foot. Typical wet spinning media blades usable for wrapping or overlapping to form media layouts, according to the present disclosure, have a thickness of at least 0.25 mm (0.01 inch) at 8.6 millibars (0.125 psi) at about 1.53 mm (0.06 inch), again at 8.6 millibars (0.125 psi). Generally, the thickness will be 0.44 to 0.76 mm (0.018 to 0.03 inch) under similar conditions.
[0107] [00107] The media described in this document have a preferred DOP efficiency of 3.2 m-min-1 (10.5 ft / minute) for 0.3 micron particles for media layers or sheets obtained by spinning via wet. This requirement indicates that several layers of the media obtained by wet spinning will typically be necessary in order to generate an overall desirable efficiency for the media stage of typically at least 70%, at least 85% or often 90% or greater, in some instances 95% or greater. In general, DOP efficiency is a fractional efficiency of a 0.3 micron DOP particle (dioctyl phthalate) channeling the media at 26.67 cm / minute (10.5 fpm). A TSI Bench 3160 model (TSI Incorporated, St. Paul, Minn., USA) can be used to evaluate this property. The dispersed DOP model particles are resized and neutralized before channeling the media. The wet spinning filtration media achieves strength through the use of added binders. However, this can compromise efficiency and permeability and increase strength. Thus, as indicated above, the blades and media stages obtained by wet spinning according to preferred embodiments in this document include no added binder or, if a binder is present, it is at a level not greater than 7% of the total weight fiber, typically not more than 3% of the total fiber weight.
[0108] [00108] The strength properties that generally define media grades include stiffness, tensile strength and compressive strength. In general, using bicomponent fibers and avoiding polymeric binders leads to less stiffness with a given or similar resistance to compression and also to good traction. Machine direction traction is the breaking force of a thin range of media evaluated in the machine direction (MD). The reference is the Tappi 494 using the following test conditions: sample width, 25.4 mm (1 inch); sample length, 101.6 mm (4 inch) range; pull rate of 50.8 mm / minute (2 inches / minute).
[0109] [00109] The modification of the surface characteristics of the fibers in media, such as increasing the angle of contact with water, should improve the drainage capacity of the filter media and, thus, the performance of a filter (reduced pressure drop and efficiency of enhanced mass). Fluoro-organic wetting agents useful in this invention for addition to the fiber layers are fluoro-organic C2-12 molecules. Preferably, a chemical substance with a chemically stable saturated perfluoroaliphatic organic group is used. However, hydrogen or chlorine atoms can be present as substituents on the structural chain. Several fibers are used in the design of, for example, filter media used for low pressure filters such as vaporization filters or others (terminal pressure drop of less than 0.07 bar (1 psi)).
[0110] [00110] One method for modifying the surface of the fibers is to apply a surface treatment such as a material containing fluorochemical or silicone, 0.001 to 5% or about 0.01 to 2.5% by weight of the media. The surface characteristics of the fibers can be modified in a layer obtained by wet spinning which can include bicomponent fibers, another secondary fiber such as synthetic, ceramic or metal fibers with and without additional resin binder. The resulting media can be incorporated into filter element structures with a thickness generally greater than 1.27 mm (0.05 inches) often about 2.54 mm (0.1 inch) to 6.35 mm (0.25 inch). The media would have XY pore size larger than conventional air media, generally greater than 10, often about 15 to 100 microns, and would be composed of fibers of larger size, generally greater than 6 microns, although in certain cases, fibers could be used to improve efficiency. The use of surface modifiers can allow the construction of media such as XY pore sizes smaller than untreated media, thereby increasing efficiency with the use of small fibers, reducing media thickness for more compact elements and reducing pressure drop of the element.
[0111] [00111] In the case of vaporization filtration, the system can be designed to drain the collected liquids. The opposite of drainage is mass gain or weight gain during filtration. Both maximum drainage and minimum weight are a desirable result of using the fiber media and arrangements described in this document. The media in both the primary element and the element prior to filtration are positioned so that the liquid can be drained from the media. Important performance properties for these two elements are: fractional equilibrium and initial efficiency, pressure drop and drainage ability. Important physical properties of the media are thickness, strength and strength.
[0112] [00112] The elements are typically aligned vertically, which improves the filter's ability to drain. In this orientation, any medium composition will exhibit an equilibrium liquid height that will be a function of XY powder size, fiber orientation and the interaction of the liquid with the fiber surface, measured as contact angle. The collection of liquid from the media will increase the height to a point balanced with the rate of drainage of the liquid from the media. Any portion of the media that is capped with the drainage liquid will not be available for filtration, thereby increasing the pressure drop and decreasing efficiency across the filter. Thus, it is advantageous to minimize the portion of the element that holds the liquid.
[0113] [00113] The three media factors that affect the drainage rate, XY pore size, fiber orientation and interaction of the liquid being drained with the fiber surface, can all be modified to minimize the portion of the media that is capped with the liquid. The XY pore size of the element can be increased to improve the drainage capacity of the media, but it must be balanced against the resulting effect of reducing the number of fibers available for filtration and thus the potential efficiency of the filter. To achieve the target efficiency, a relatively thick element structure may be required, typically larger than 3.18 mm (0.125 inch), due to the need for a relatively large XY pore size. The fibers can be oriented with the vertical direction of the media. The interaction of the liquid being drained with the fiber surface can be modified to improve the drainage rate.
[0114] [00114] In one application, filtration applications with crankcase, small oil particle vapors are captured, collected in the element and eventually drained from the element back to the collection well of the motor mechanism. The filtration systems installed in the breather with crankcase of diesel engine mechanisms can be composed of multiple elements, a pre-filter that removes large particles generally larger than 5 microns and a primary filter that removes the volume of residual contamination. The primary element can be composed of one or multiple layers of media. The composition of each layer can be varied to optimize efficiency, pressure drop and drain performance.
[0115] [00115] Due to the size restrictions of the filtration system, the pre-elements and primary elements must be designed for fractional efficiency of balance or increase in median mass. Fractional equilibrium efficiency is defined as the efficiency of the element once the element is draining a liquid at a rate identical to the collection rate. The three performance properties, fractional and initial efficiency, pressure drop and drainage capacity are balanced against the element design to achieve optimum performance. So, as an example, short elements in a high liquid loading environment must be designed to drain at a relatively quick rate.
[0116] [00116] In a preferred embodiment of the invention, the filter medium or means is provided with a thermally bonded blade. A blade is comprised of about 20 to 80% by weight of a first two-component core-coat binder fiber and about 5 to 20% by weight of an optional second two-component fiber. The first two-component fiber has a core polymer with a melting point of about 240 to 260 ° C and a coating melting point of about 140 to 160 ° C. The optional second two-component fiber has a core polymer with a melting point of 240 to 260 ° C and a coating polymer with a melting point of at least 10 ° C less than the first two-component fiber and can be in the range of about from 70 to 140 ° C, 75 to 120 ° C or 75 to 110 ° C. The means or blanket also comprise about 20 to 80% by weight of a medium or textile fiber. Each of the two-component binder fibers has a diameter of about 5 to 50 micrometers and a length of about 0.1 to 15 cm. The medium or textile fiber has a diameter of about 0.1 to 30 micrometers and an aspect ratio of about 10 to 10,000. The medium has a thickness of about 0.2 to 50 mm, a solidity of about 2 to 25%, a base weight of about 10 to 1000 gm-2, a pore size of about 0.5 to 100 micrometers and a permeability of about 5 to 500 feet-min-1. The means are comprised of about 0.5 to 15% by weight of a secondary fiber. The means are comprised of a single layer or two or more layers. The media are comprised of about 0.01 to 10% by weight of a fluororganic agent. The exemplary modalities of different media compositions are shown in Table 1 and Table 2:
[0117] [00117] A method of the invention incorporates the filtration of a liquid stream, in which the method is comprised by placing a filter unit in the stream and retaining the solid particulate trapped in the stream on the filter surface using media filter inside the filter unit. The filter means are comprised of a thermally bonded blade. The thermally bonded sheet is comprised of about 10 to 90% by weight of the total of a first and a second optional two-component binder fiber and about 10 to 90% by weight of a media fiber. The optional fiber is used between about 0 and 40% by weight, 2 and 30% by weight or 5 and 25% by weight. The bicomponent binder fiber has a diameter of about 5 to 50 micrometers and a length of about 0.1 to 15 cm. The media fiber has a diameter of about 0.1 to 5 micrometers and an aspect ratio of about 10 to 10,000. The media has a thickness of about 0.1 to 2 mm, a solidity of about 2 to 25%, a base weight of about 2 to 200 gm-2, a pore size of about 0.2 to 50 micrometers and a permeability of about 2 to 200 feet-min-1 (0.6 to 60 m-min-1). The liquid to be filtered can be an aqueous liquid or a non-aqueous liquid. The means are comprised of a single layer or two or more layers. The media are comprised of about 0.01 to 10% by weight of a fluororganic agent.
[0118] [00118] Another method of the invention incorporates the filtration of a gaseous fluid. The method is understood by passing a phase of gaseous mobile fluid containing a liquid aerosol contaminant (which can also contain a solid particulate) through a filter medium, the medium has a thickness of about 0.2 to 50 mm , the medium comprises a thermally bonded slide and the removal of the contaminant. The blade is comprised of about 10 to 80% by weight of a first and a second optional two-component binder fiber and about 20 to 80% by weight of a medium or textile fiber. The optional fiber is between about 0 to 40% by weight, 2 to 30% by weight or 5 to 25% by weight. The bicomponent binder fiber has a diameter of about 5 to 50 micrometers and a length of about 0.1 to 15 cm. The medium or textile fiber has a diameter of about 0.1 to 30 micrometers. The media have a solidity of about 2 to 25%, a base weight of about 10 to 1,000 gm-2, a pore size of about 0.5 to 100 micrometers and a permeability of about 5 to 500 feet- min-1 (1.5 to 152 m-min-1), the mobile fluid phase has a temperature higher than the melting point of the second component. In one embodiment of the method described, the fluid is either a gas or a liquid. In one embodiment of the method described, the liquid is an aqueous liquid, fuel, lubricating oil or hydraulic fluid. In one embodiment of the method described, the contaminant is a liquid or a solid.
[0119] [00119] Another method of the invention incorporates the filtration of a heated gas or liquid fluid. The method is comprised of passing a phase of a mobile fluid containing a contaminant through a filter medium, the medium has a thickness of about 0.2 to 50 mm, the medium comprises a thermally bonded slide and removing the contaminant . The blade is comprised of about 20 to 80% by weight of a two-component binder fiber and about 20 to 80% by weight of a medium or textile fiber. The bicomponent binder fiber has a first component with a melting point and a second component with a lower melting point. The bicomponent binder fiber has a diameter of about 5 to 50 micrometers and a length of about 0.1 to 15 cm. The medium or textile fiber has a diameter of about 0.1 to 30 micrometers. The media have a solidity of about 2 to 25%, a base weight of about 10 to 1000 gm-2, a pore size of about 0.5 to 100 micrometers and a permeability of about 5 to 500 feet- min-1 (1.5 to 152 m-min-1), the mobile fluid phase has a temperature higher than the melting point of the second component. In one embodiment of the method described, the fluid is a gas or liquid. In one embodiment of the method described, the liquid is an aqueous liquid, fuel, lubricating oil or hydraulic fluid. In one embodiment of the method described, the contaminant is a liquid or a solid.
[0120] [00120] The medium described in the present invention can be assembled with other conventional filter structures to produce a composite filter layer or filter unit. The medium can be assembled with a base layer which can be a membrane, a cellulosic medium, a synthetic medium, a talagarça or an expanded metal support. The medium can be used in conjunction with many other types of media, such as conventional media, to improve the performance or life of the filter.
[0121] [00121] A perforated structure can be used to support the media under the influence of fluid under pressure that passes through the media. The filter structure of the invention can also be combined with the additional layers of a perforated structure, a talag, such as a mechanically stable and high permeability talag, and the additional filtration layers such as a separate loading layer. In one embodiment, such a combination of media with multiple regions is housed in a filter cartridge commonly used in the filtration of non-aqueous liquids.
[0122] [00122] In one embodiment, a method of producing a non-woven blanket includes dispensing a fluid stream from a first source, in which the fluid stream includes the fiber. The method also includes collecting the fiber in a reception region located proximal and downstream from the source. The receiving region is designed to receive the flow current dispensed from the source and form a wet layer through the collection of the fiber. An additional step in the method is to dry the wet layer to form the nonwoven blanket.
[0123] [00123] In another embodiment, a method of producing a non-woven blanket includes providing a pulp from a source, where the pulp includes at least one first fiber and dispensing a chain of the pulp from an apparatus to produce a non-woven blanket . The method also includes collecting the fiber that passes through the opening in a receiving region located downstream from the source, collecting a remainder of the fiber in the receiving region in a portion downstream of the mixing partition and drying the wet layer to form the blanket non-woven.
[0124] [00124] In a wet spinning processing modality, the medium is produced from an aqueous paste that comprises a dispersion of fibrous material and other components as needed in an aqueous medium. The aqueous liquid of the dispersion is generally water, but can include various other materials such as pH adjusting materials, surfactants, foam-removing agents, flame retardants, viscosity modifiers, media treatments, dyes and the like. The aqueous liquid is usually drained from the dispersion by conducting the dispersion on a screen, angled screen or other perforated support that retains the dispersed solids and the passage of the liquid to produce a wet media composition. The wet composition, once formed on the support, is usually still dehydrated by vacuum or other pressure forces and further dried by evaporating the remaining liquid. Options for removing liquid include gravity drain devices, one or more vacuum devices, one or more table rollers, metal vacuum sheets, vacuum rollers or a combination thereof. The apparatus may include a proximal drying section and downstream of the receiving region. The options for the drying section include a drying container section, one or more IR heaters, one or more UV heaters, an air dryer, a transfer wire, a mat or a combination thereof.
[0125] [00125] After the liquid is removed, heating to induce thermal bonding may occur where appropriate by melting some portion of the thermoplastic fiber, resin or other portion of the formed mat material. Other post-treatment procedures are also possible in several modalities, including chemical treatment, resin curing steps. Pressing, thermo-treatment and additive treatment are examples of post-treatment that can occur before the yarn is collected. After collecting the yarn, additional treatments such as drying and grounding the fibrous tarpaulin can be carried out in finishing processes.
[0126] [00126] A specific machine that can be used as described in the present invention is the Deltaformer ™ machine (available from Glens Falls Interweb, Inc. of South Glens Falls, NY, USA), which is a machine designed to form aqueous slurries of fiber diluted in fibrous media. Such a machine is useful where, for example, inorganic or organic fibers with relatively long fiber lengths for a wet spinning process are used, due to the fact that large volumes of water need to be used to disperse the fibers and to maintain them intertwined in the folder. The long fiber in the wet spinning process typically means fiber with a length greater than 4 mm, which can be in the range of 5 to 10 mm and greater. Nylon fibers, two-component fiber, cotton lint, polyester fibers (such as Dacron®), regenerated cellulose fibers (rayon) fibers, acrylic fibers (such as Orlon®), cotton flax fibers, polyolefin fibers ( that is, polypropylene, polyethylene, copolymers thereof and the like), and abaca fibers (Manila Hemp) are examples of fibers that are advantageously formed in fibrous media with the use of such a modified inclined paper production machine.
[0127] [00127] The Deltaformer ™ machine differs from the traditional Fourdrinier machine in that the wire section is installed on an incline, which forces watery pastes to flow upwards against gravity as they leave the main box. The slope stabilizes the flow pattern of diluted solutions and helps control the drainage of diluted solutions. A multi-compartment vacuum forming box assists in controlling drainage. These modifications provide a means to form aqueous slurries diluted in fibrous media with improved uniformity of properties, along the mat when compared to a traditional Fourdrinier design.
[0128] [00128] In a wet section mode, mixtures of fibers and fluid are supplied as a pulp after a separate pulp production process. The paste can be mixed with additives before being passed on to the next step in the media formation process. In another embodiment, the dry fibers can be used to produce the pulp by sending the dry fibers and the fluid through a refiner that can be part of the wet section. In the refiner, the fibers are subjected to high pressure pulses between the bars on rotating refiner discs. This breaks up the dry fibers and further disperses them in fluid such as water that is supplied to the refiner. Washing and deaeration can also be performed at this stage.
[0129] [00129] After the paste production is completed, the paste can enter the structure that is the source of the flow stream, such as a main box. The structure of the fountain disperses the paste for a width, it loads it on a moving wire mesh mat with a jet of an opening. In some embodiments, described in the present invention, two sources or two main boxes are included in the apparatus. Different main box configurations are useful in providing means. In one configuration, top and bottom main boxes are stacked exactly on top of each other. In another configuration, the upper and lower main boxes are somewhat misaligned. The upper main box may still be below the machine direction, while the lower main box is upstream.
[0130] [00130] In one embodiment, the jet is a fluid that incites, moves or propels a paste, such as water or air. The jet transmission can create some fiber alignment, which can be partially controlled by adjusting the speed difference between the jet and the wire mesh conveyor. The wire revolves around a front driving roller, or bedside roller, from under the main box, in addition to the main box where the paste is applied and on what is commonly called the forming plate.
[0131] [00131] The formation plate works with the paste that is leveled and the fiber alignment can be adjusted in preparation for removing water. Further down the process line, the drain boxes (also called the drain section) remove the liquid from the medium with or without a vacuum. Near the end of the wire mesh conveyor, another roller, often called a resting roller, removes residual liquid with a vacuum that is a vacuum force greater than previously present in the line.
[0132] [00132] The medium described in the present invention can be assembled with other conventional filter structures to produce a composite filter layer or filter unit. The medium can be assembled with a base layer which can be a membrane, a cellulosic medium, a synthetic medium, a talagarça or an expanded metal support. The medium can be used in conjunction with many other types of media, such as conventional media, to improve the performance or life of the filter.
[0133] [00133] A perforated structure can be used to support the media under the influence of fluid under pressure that passes through the media. The filter structure of the invention can also be combined with additional layers of a perforated structure, a talag, such as a mechanically stable and high permeability talag, and additional filtration layers such as a separate loading layer. In one embodiment, such a combination of multi-region media is housed in a filter cartridge commonly used in the filtration of non-aqueous liquids.
[0134] [00134] The non-woven blankets of the invention include fibers in a thermally bonded blanket, wherein the blanket includes a bicomponent fiber that has a core polymer and a shell polymer, where the shell has a melting point that is greater than about 115 ° C, where the bicomponent fiber has a diameter of about 5 to 25 μm and a length of about 2 to 15 μm; and a synthetic or cellulosic polymer fiber; wherein the blanket is substantially free of fiberglass. The melting point of the shell polymer can be between 120 ° C and 180 ° C and in preferred embodiments about 140 ° C to 160 ° C. In core / shell modes, the melting point temperature of the core polymer is greater than the melting point of the shell. In some embodiments, the melting point of the second polymer or core is at least about 240 ° C. The diameter of the bicomponent fiber is about 5 to 50 micrometers, often about 10 to 20 micrometers, and typically a fiber shape usually has a length of 0.1 to 20 millimeters or often has a length of about 0.2 to about 15 millimeters.
[0135] [00135] In some embodiments, of the non-woven blankets of the invention described above, the thermally bonded blanket has about 1 to 30% by weight of the bicomponent fiber and 70 to 99% by weight of the textile fiber and the blanket has a thickness of about 0.2 to 2 mm, a solidity of about 1 to 20% or about 2 to 10%, a basis weight of about 45 to 150 gm-2, a pore size of about 12 to 50 microns and a permeability of about 1.5 to 3 m / s. In some embodiments, the thermally bonded blanket has about 0.1 to 50% by weight of the bicomponent fiber and about 50 to 99.9% by weight of the textile fiber. In some embodiments, the blanket has a thickness of about 0.1 mm to 2 cm. In some embodiments, the blanket has a solidity of about 1 to 20%. In some embodiments, the blanket has a base weight of about 20 to 300 g-m-2 or about 50 to 130 g-m-2. In some embodiments, the blanket has a pore size of about 5 to 150 microns. In some embodiments, the blanket has a permeability of about 0.5 to 10 m / s. In some embodiments, the textile fiber is about 1 to 20% by weight of a cellulosic fiber or about 10 to about 50% by weight of a polyester fiber.
[0136] [00136] In some modalities of a non-woven blanket described above, the textile fiber is a mixture of both cellulosic fiber and polyester fiber, in which the blend is composed of about 1 to 20% by weight of a cellulosic fiber and about 10 to about 50% by weight of a polyester fiber in relation to the weight of the blanket. In some embodiments, the textile fiber is about 5 to 15% by weight of a cotton lint fiber or about 10 to about 50% by weight of a polyester fiber. In some embodiments, the textile fiber is a blend of both cotton lint fiber and polyester fiber, where the blend is made up of about 5 to 15% by weight of a cotton lint fiber and about 10 to about 50% by weight of a polyester fiber in relation to the weight of the blanket. In some embodiments, the mat has about 1 to 30% by weight of the bicomponent fiber and 70 to 99% by weight of the textile fiber, and the mat has a thickness of about 0.2 to 2 mm, a solidity of about 1 to 20% or about 2 to 10%, a basis weight of about 45 to 150 gm-2, a pore size of about 12 to 50 microns and a permeability of about 1.5 to 3 m / s . In some embodiments, the thermally bonded blanket has about 0.1 to 50% by weight of the bicomponent fiber and about 50 to 99.9% by weight of the textile fiber. In some embodiments, the blanket has a thickness of about 0.1 mm to 2 cm. In some embodiments, the blanket has a solidity of about 1 to 20%. In some embodiments, the blanket has a base weight of about 20 to 300 g-m-2 or about 50 to 130 g-m-2. In some embodiments, the blanket has a pore size of about 5 to 150 microns. In some embodiments, the blanket has a permeability of about 0.5 to 10 m / s. In some embodiments, the textile fiber is about 1 to 20% by weight of a cellulosic fiber or about 10 to about 50% by weight of a polyester fiber.
[0137] (a) cerca de 1 a 30 % em peso com base no peso da manta de uma primeira fibra bicomponente que tem um primeiro polímero de núcleo e um primeiro polímero de casca, em que o primeiro polímero de casca tem um ponto de fusão de até 115 °C e a primeira fibra bicomponente tem um diâmetro de cerca de 5 a 25 μm e um comprimento de cerca de 2 a 15 mm; (b) cerca de 5 a 50 % em peso com base no peso da manta de uma segunda fibra bicomponente que tem um segundo polímero de núcleo e um segundo polímero de casca, em que o segundo polímero de casca tem um ponto de fusão de cerca de 120 °C a 170 °C e a segunda fibra bicomponente tem uma fibra diâmetro de cerca de 5 a 25 mícrons e um comprimento de fibra de cerca de 2 a 15 mm; e (c) cerca de 10 a 80 % em peso com base no peso da manta de uma fibra têxtil; em que a manta tem a espessura de cerca de 0,25 a 2 mm, uma solidez de cerca de 5 a 10%, um peso base de cerca de 45 a 150 g-m-2, um tamanho de poro de cerca de 12 a cerca de 50 mícrons e uma permeabilidade de cerca de 1,5 a 3 m/s. Em algumas de tais modalidades, o ponto de fusão do segundo polímero de casca é cerca de 140 °C a 160 °C. Em algumas de tais modalidades, a primeira fibra bicomponente e a segunda fibra bicomponente são fibras de núcleo/casca que têm primeiro e segundo polímero de núcleos que têm um ponto de fusão de 240 a 260 °C. Em algumas de tais modalidades, a manta tem um peso base de cerca de 50 a cerca de 130 g-m-2. Em algumas de tais modalidades, a manta é substancialmente isenta de vidro. Em algumas de tais modalidades, a fibra têxtil inclui cerca de 1 a 20% em peso de uma fibra celulósica e cerca de 10 a 50% em peso de uma fibra de poliéster. Em algumas de tais modalidades, a fibra têxtil inclui cerca de 5 a 15% em peso de uma fibra de línter de algodão e cerca de 10 a 50% em peso de uma fibra de poliéster.[00137] In embodiments, the non-woven blankets of the invention include fibers in a thermally bonded blanket, where the blanket includes (a) about 1 to 30% by weight based on the weight of the blanket of a first two-component fiber that has a first core polymer and a first shell polymer, where the first shell polymer has a melting point of up to 115 ° C and the first two-component fiber has a diameter of about 5 to 25 μm and a length of about 2 to 15 mm; (b) about 5 to 50% by weight based on the weight of the blanket of a second two-component fiber that has a second core polymer and a second shell polymer, wherein the second shell polymer has a melting point of about from 120 ° C to 170 ° C and the second two-component fiber has a fiber diameter of about 5 to 25 microns and a fiber length of about 2 to 15 mm; and (c) about 10 to 80% by weight based on the weight of the blanket of a textile fiber; where the mat is about 0.25 to 2 mm thick, about 5 to 10% solid, about 45 to 150 gm-2 base weight, about 12 to about 6 50 microns and a permeability of about 1.5 to 3 m / s. In some of these embodiments, the melting point of the second shell polymer is about 140 ° C to 160 ° C. In some of such embodiments, the first two-component fiber and the second two-component fiber are core / shell fibers that have first and second polymer cores having a melting point of 240 to 260 ° C. In some of these embodiments, the blanket has a base weight of about 50 to about 130 gm-2. In some of these embodiments, the blanket is substantially free of glass. In some of such embodiments, the textile fiber includes about 1 to 20% by weight of a cellulosic fiber and about 10 to 50% by weight of a polyester fiber. In some of these embodiments, the textile fiber includes about 5 to 15% by weight of a cotton lint fiber and about 10 to 50% by weight of a polyester fiber.
[0138] (a) cerca de 1 a 15 % em peso de uma primeira fibra bicomponente que tem um primeiro polímero de núcleo com um ponto de fusão de 240° a 260 °C e um primeiro polímero de casca com um ponto de fusão de 100° a 115 °C; em que a primei-ra fibra bicomponente tem um diâmetro de cerca de 10 a 15 μm e uma comprimento de fibra de cerca de 0,3 a 0,9 cm; (b) cerca de 5 a 50 % em peso de uma segunda fibra bicomponente que tem um segundo polímero de núcleo com um ponto de fusão de 240° a 260 °C e um segundo polímero de casca com um ponto de fusão de 120° a 160 °C; em que a segunda fibra bicomponente tem um diâmetro de cerca de 10 a 15 mícrons e um comprimento de fibra de cerca de 0,3 a 0,9 centímetros; (c) cerca de 1 a 20 % em peso de uma fibra de línter de algodão; e (d) cerca de 10 a 50 % em peso de uma fibra de poliéster. [00138] In embodiments, the non-woven blankets of the invention include fibers in a thermally bonded blanket that is substantially free of a glass fiber, wherein the blanket includes (a) about 1 to 15% by weight of a first two-component fiber that has a first core polymer with a melting point of 240 ° to 260 ° C and a first shell polymer with a melting point of 100 ° a 115 ° C; wherein the first two-component fiber has a diameter of about 10 to 15 μm and a fiber length of about 0.3 to 0.9 cm; (b) about 5 to 50% by weight of a second bicomponent fiber having a second core polymer with a melting point of 240 ° to 260 ° C and a second shell polymer with a melting point of 120 ° to 160 ° C; wherein the second two-component fiber has a diameter of about 10 to 15 microns and a fiber length of about 0.3 to 0.9 centimeters; (c) about 1 to 20% by weight of a cotton lint fiber; and (d) about 10 to 50% by weight of a polyester fiber.
[0139] [00139] In some of such embodiments, the melting point of the second shell polymers is about 140 ° to 160 ° C. In some of these embodiments, the polyester fiber comprises about 1 to 20% by weight of a textile fiber that has a diameter of 7 to 15 μm and a cotton or cellulosic fiber that has a diameter of 15 to 55 μm and the The ratio of diameters of the first polyester fiber to the second polyester fiber is about 1: 1.2 to 1: 5.
[0140] (a) formar uma pasta que inclui uma concentração aquosa de sólidos de cerca de 0,005 a 5 ou 0,005 a 7% em peso dos sólidos incluindo cerca de 20 a cerca de 60 % em peso de uma fibra bicomponente, cerca de 5 a cerca de 25 % em peso de uma fibra de línter de algodão e cerca de 10 a 50% em peso de uma fibra de poliéster têxtil que tem um diâmetro de cerca de 7 a cerca de 15 μm e um comprimento de fibra de cerca de 3 a cerca de 10 mm; (b) colocar em contato a pasta com uma tela inclinada para formar uma camada molhada; e (c) secar a camada molhada para formar uma manta. [00140] The modalities of the invention include the method of producing a non-woven blanket that includes a thermally bonded blanket, wherein the method involves: (a) forming a slurry that includes an aqueous solids concentration of about 0.005 to 5 or 0.005 to 7% by weight of the solids including about 20 to about 60% by weight of a two-component fiber, about 5 to about 25% by weight of a cotton lining fiber and about 10 to 50% by weight of a textile polyester fiber that has a diameter of about 7 to about 15 μm and a fiber length of about 3 to about 10 mm; (b) placing the paste in contact with an inclined screen to form a wet layer; and (c) drying the wet layer to form a blanket.
[0141] [00141] In some of these modalities, the polyester fiber includes about 1 to 20% by weight of a textile fiber that has a diameter of 7 to 15 μm and a cotton or cellulosic fiber that has a diameter of 15 to 55 μm and the ratio of the diameters of the first polyester fiber to the second polyester fiber is about 1: 1.2 to 1: 5.
[0142] [00142] Pastes were formulated to produce non-woven blankets that have improved properties. Examples 1 to 3 show compositional information about the paste formulations.
[0143] 1. Uma fibra de poliéster bicomponente conhecida como 271P disponível junto à E. I. DuPont Nemours, Wilmington DE, EUA com um temperatura de fusão de revestimento de cerca de 73 °C. O diâmetro médio de fibra de 271P é cerca de 13 mícrons e o comprimento é 6 mm. 2. Fibra bicomponente conhecida como uma fibra de corte curto produzida a partir de uma mistura de poliéster/copoliéster, que consiste em 49,5% de tereftalato de polietileno, 47% de copoliéster e 2,5% de copolímero de polietileno (BI-CO). Um exemplo de tal fibra é TJ04BN SD 2.2X5 disponível junto à Teijin Fibers Limited de Osaka, Japão com uma temperatura de fusão de revestimento de cerca de 155 °C. O diâmetro médio de fibra é 13 mícrons e o comprimento é 6 mm. 3. Fibra celulósica de línter de algodão Buckeye Corp Source Fiber. 4. Fibra de poliéster (P20FM) ou Invista 205 WSD disponível junto à Barnet USA de Arcadia, South Carolina, EUA. [00143] The following different fibers were used in the paste examples mentioned in Table 1, where an abbreviation for each fiber is provided in parentheses: 1. A bicomponent polyester fiber known as 271P available from EI DuPont Nemours, Wilmington DE, USA with a coating melting temperature of around 73 ° C. The average fiber diameter of 271P is about 13 microns and the length is 6 mm. 2. Two-component fiber known as a short-cut fiber produced from a polyester / copolyester mixture, consisting of 49.5% polyethylene terephthalate, 47% copolyester and 2.5% polyethylene copolymer (BI- CO). An example of such a fiber is TJ04BN SD 2.2X5 available from Teijin Fibers Limited of Osaka, Japan with a coating melting temperature of about 155 ° C. The average fiber diameter is 13 microns and the length is 6 mm. 3. Buckeye Corp Source Fiber cotton lint cellulosic fiber. 4. Polyester fiber (P20FM) or Invest 205 WSD available from Barnet USA of Arcadia, South Carolina, USA.
[0144] [00144] In these examples, sulfuric acid was added to adjust the pH to approximately 3.0 to disperse the fibers in the aqueous suspension. The fiber content was approximately 0.03% (% by weight) in the aqueous slurry suspensions used to produce the media in the examples. The pastes containing the dispersed fibers were stored in their respective machine bases (storage tanks) for subsequent use. During the manufacture of the media, the pulp streams were fed into their respective main boxes after the appropriate dilution.
[0145] [00145] Other variables on the machine that are adjusted during media formation include disaggregator consistency, angle of inclination of the initial mixing partition, angle of inclination of the machine, angle of inclination of the extended mixing partition, base weight, machine speed , standing height, paste flow, main cash flow, main cash consistency and drain cash collection. The resulting media can be post-treated, typically with a single mat treatment process step, for example, with chemical treatment, additives, calendering, heat or other methods and equipment familiar in the art to provide a finished fibrous gradient canvas.
[0146] [00146] The tensile strength of test and load sample strips and tensile strength are measured after the TAPPI T 404 procedure. Additional requirements for testing manual pulp blades are detailed in the TAPPI 220 standard. These include burst resistance evaluation, tensile breaking load; rupture length and tear factor. The Tensile Energy Absorption (TEA) of the paper is defined as the area under the elongation-load curve (ie energy) related to the surface area of the paper between the handles. This result is typically used to characterize the energy absorption capacity of the paper (see TAPPI T 494) and the use of a microprocessor or computer to calculate the energy considerably simplifies data reduction. Stretch Measurement - the amount of stretch on the paper and board is a critical measure of quality, as it is a necessary requirement for a blade to be well folded and resist local stresses when used in packaging, corrugated board and fabrics. It is suggested that after the initial grip of a sample on the upper handle, a small tension is applied to remove the ripple. The sample is then pulled to burst within a specified time, as detailed in T 457. When TEA measurement is required, a constant rate of stretch tester with a plotter according to the TAAPPI T494-os specification is used. A sample is produced using a 1 x 6 "die cutter. The sample is cured, if necessary, in an oven capable of maintaining 149 ° C. In the test, two representative samples that have dimensions of 178 x 178 mm are Care is taken to ensure that the samples were cured at or above the melting point of the microphone fiber. From the samples, three specimens in each of the machine direction and the machine cross direction that have dimensions of 25.4 x 152 mm are obtained.The specimens are dried for 24 hours.If the specimens are tested in a white condition, the specimens are immersed in distilled water containing 1% Triton-100 surfactant. the stains removed to remove excess liquid and tested. The samples are attached to the tester in the installed upper and lower jaw spaced 10.16 cm (4 inches) apart. The tester is installed to tension the sample to 5.08 cm / min (2 inches / min) .The tester is the and any specimen failure is observed. If no failure is observed, the tensile strength and the strength of pounds or kilograms is recorded. Using the data, the tensile strength or average TE resulting from three successful tests is reported along with the wet or dry nature of the sample in the machine direction and any other relevant notation.
[0147] [00147] In these tables, the resistance to bursting and the resistance to heat traction of the claimed materials are better than those of the comparative examples and the resistance improved as the temperature is increased is also seen.
[0148] [00148] Although the invention has been described in conjunction with the specific modalities thereof, it will be understood that it has the capacity for further modifications and this application is intended to cover any variations, uses or adaptations of the invention that generally follow the principles of the invention and include such deviations from the present disclosure insofar as they arise from the common or known practice of the technique to which the invention belongs and as may be applied to the prior essential resources of the present invention presented and below in the scope of the appended claims.

权利要求:
Claims (17)
[0001]
Non-woven blanket comprising fibers in a thermally bonded blanket CHARACTERIZED by the fact that it comprises: (a) a bicomponent fiber having a portion of structural polymer and a portion of thermoplastic binding polymer, the binding polymer having a melting point greater than 115 ° C; the bicomponent fiber having a diameter of about 5 to 25 μm and a length of about 2 to 15 mm; and (b) a textile fiber; wherein the blanket is substantially free of fiberglass; the blanket comprises: about 1 to 30% by weight of the bicomponent fiber having a portion of polymer binder having a melting point greater than 120 ° C; and about 70 to 99% by weight of the textile fiber, the textile fiber comprising a cellulosic or synthetic polymer fiber; where the blanket has a thickness of about 0.1 to 2 mm,
[0002]
Blanket according to claim 1, CHARACTERIZED by the fact that the melting point of the polymer binding portion is about 140 to 160 ° C and the melting point of the structural polymer portion is at least 240 ° C.
[0003]
Blanket, according to claim 1, CHARACTERIZED by the fact that it comprises: a solidity of about 2 to 10%, a base weight of about 45 to 150 g / m2 and a permeability of about 1.5 to 3 m / s.
[0004]
Blanket according to claim 1, CHARACTERIZED by the fact that the blanket has a base weight of about 50 to about 130 grams per square meter and a pore size of about 12 to 50 microns.
[0005]
Blanket according to claim 1, CHARACTERIZED by the fact that the textile fiber comprises a combination of about 1 to about 20% by weight of a cellulosic fiber and about 10 to about 50% by weight of a fiber polyester.
[0006]
Blanket according to claim 1, CHARACTERIZED by the fact that the textile fiber comprises a combination of about 5 to 15% by weight of a cotton lint fiber and about 10 to about 50% by weight of a fiber polyester.
[0007]
Blanket according to claim 1, comprising fibers in a thermally bonded blanket CHARACTERIZED by the fact that it comprises: (a) about 1 to 30% by weight, based on the weight of the mat, of a two-component fiber having a core polymer and a shell polymer, where the core polymer has a melting point of at least 240 ° C and the shell polymer has a melting point of up to 115 ° C; and the bicomponent fiber has a diameter of about 5 to about 25 μm and a length of about 2 to about 15 mm; (b) about 5 to 50% by weight, based on the weight of the mat, of a two-component fiber having a core polymer and a shell polymer, wherein the core polymer has a melting point of at least 240 ° C and the shell polymer has a melting point of 120 ° C to 170 ° C; and the bicomponent fiber has a diameter of about 5 to about 25 microns and a length of about 2 to about 15 mm; and (c) about 10 to 80% by weight based on the weight of the blanket of a textile fiber; where the blanket has a thickness of about 0.25 to about 2 mm, a solidity of about 5 to about 10%, a base weight of about 45 to about 150 grams per square meter, a size of pore of about 12 to about 50 microns and a permeability of about 1.5 to about 3 m / s.
[0008]
Blanket according to claim 7, CHARACTERIZED by the fact that it comprises about 0.5 to about 5% by weight of a C2 to C9 fluorochemical treatment, the weight percentage based on the blanket, in which the blanket is subs - substantially free of a fiberglass.
[0009]
Blanket according to claim 8, CHARACTERIZED by the fact that the fibers have a fiber treatment of about 0.1 to 5% by weight of a C6 fluoroalkyl acrylic polymer.
[0010]
Blanket according to claim 7, CHARACTERIZED by the fact that the core polymers of part (a) and part (b) have a melting point of 240 ° C to about 260 ° C.
[0011]
Blanket according to claim 7, CHARACTERIZED by the fact that the textile fiber comprises about 1 to 50% by weight of the blanket and comprises a cellulosic fiber or a polyester fiber, or a mixture thereof.
[0012]
Blanket according to claim 7, CHARACTERIZED by the fact that the textile fiber comprises a combination of about 5 to 15% by weight of a cotton lint fiber and about 10 to 50% by weight of a polyester fiber -to have.
[0013]
Blanket according to claim 1, CHARACTERIZED by the fact that it comprises fibers in a thermally bonded blade, the blade substantially free of a glass fiber, the blanket comprising: (a) about 1 to about 15% by weight of a two-component fiber having a first core polymer with a melting point of 240 ° C to 260 ° C and a shell polymer with a melting point of 100 ° C at 115 ° C; wherein the bicomponent fiber has a diameter of about 10 to about 15 μm and a length of about 0.3 to 0.9 cm; (b) about 5 to about 50% by weight of a two-component fiber having a core polymer having a melting point of 240 ° C to 260 ° C and a shell polymer having a melting point of 120 ° C at 160 ° C; wherein the bicomponent fiber has a diameter of about 10 to 15 microns and a length of about 0.3 to 0.9 centimeters; (c) a cotton lint fiber; and (d) a polyester fiber.
[0014]
Blanket according to claim 13, CHARACTERIZED by the fact that the polyester fiber comprises about 1 to 20% by weight of a polyester textile fiber having a diameter of 7 to 15 μm and about 10 to 50% by weight of the cotton lint fiber having a diameter of 15 to 55 μm, and the ratio between the diameters of the first polyester fiber and the second polyester fiber is about 1: 1.2 to 1: 5.
[0015]
Method for producing a non-woven blanket that comprises a thermally bonded blanket, as defined in claim 1, CHARACTERIZED by the fact that the method comprises: (a) forming a slurry comprising an aqueous solids concentration of about 0.005 to about 5% by weight; solids comprising about 20 to about 60% by weight of a bicomponent fiber; about 5 to about 25% by weight of a textile fiber comprising a cotton lint fiber; and cotton fiber having a diameter of less than about 80 μm and a fiber length of less than about 4 mm; (b) making contact of the paste with an inclined screen to form a moist layer; and (c) forming a blanket from the wet layer.
[0016]
Method according to claim 15, CHARACTERIZED by the fact that the textile fiber comprises about 1 to 20% by weight of a polyester textile fiber having a diameter of 7 to 15 μm, and a cotton fiber having a diameter of 15 to 55 μm, wherein the ratio of the diameters of the first polyester fiber to the second polyester fiber is about 1: 1.2 to 1: 5.
[0017]
A water-based paste suitable for forming a non-woven blanket, as defined in claim 1, CHARACTERIZED by the fact that it comprises a thermally bonded sheet comprising an aqueous medium comprising: (a) about 1 to 30% by weight of a first two-component fiber having a core polymer and a shell polymer with a melting point of up to 115 ° C; and a diameter of about 13 μm in the fiber length of about 0.6 cm; (b) about 20 to 50% by weight of a second two-component fiber having a core polymer and a shell polymer with a melting point of 115 ° C to 170 ° C; and having a fiber diameter of about 13 microns and a fiber length of about 0.6 centimeters; (c) about 20 to 50% by weight of a non-two-component textile polyester fiber having a fiber diameter of about 10 microns and a fiber length of about 0.6 cm having a melting point greater than about 250 degrees centigrade; (d) about 7.5% by weight of a textile cellulosic cotton linter fiber having a fiber diameter of about 29 microns and a fiber length of about 0.3 centimeters; and (e) the mat comprising a fiber treatment of about 0.5 to 5% by weight of a C2-6 fluorochemical; where weight percentages are based on solids content and the mat is about 0.7 millimeters thick, about 8 percent solid, about 65 g / m2 base weight, pore size of about 30 microns and a permeability of 2 meters per second, in which the paste is substantially free of fiber.

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法律状态:
2018-04-03| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|

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2019-07-16| B06T| Formal requirements before examination [chapter 6.20 patent gazette]|

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2020-07-28| B06A| Patent application procedure suspended [chapter 6.1 patent gazette]|

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2020-11-24| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|

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2021-01-12| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 16/03/2012, OBSERVADAS AS CONDICOES LEGAIS. |

优先权:

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申请号 | 申请日 | 专利标题

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US201161454171P| true| 2011-03-18|2011-03-18|

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US201161454172P| true| 2011-03-18|2011-03-18|

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US61/454.171|2011-03-18|

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US61/454.172|2011-03-18|

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PCT/US2012/029455|WO2012129094A1|2011-03-18|2012-03-16|High temperature treated media|

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