surface bonded laminate and method of bonding at least one fibrous mat to at least one substrate

专利摘要:
LINKED SUBSTRATES AND METHODS FOR LINKING SUBSTRATES. The present invention relates to apparatus and methods for impacting heated fluids against substrate surfaces to heat the substrate surfaces for the purpose of facilitating the melt bonding of the substrates together to form a laminate. Also described is laminate in which a fibrous mat is bonded to a substrate in a surface bonded fashion and/or is bonded in a thickness retainer fashion. The substrate may comprise protrusions on the surface of the substrate opposite the surface that is attached to the fibrous web.
公开号:BR112012015372B1
申请号:R112012015372-2
申请日:2010-12-20
公开日:2021-04-20
发明作者:Biegler Kristopher K.；Ferreiro Jorge A.；Serra Gabriela F.；Unruh William C.；Parodi Omar A.；Panza Victor F.；Gorman Michael R.
申请人:3M Innovative Properties Company；
IPC主号:

专利说明:

Background
[001] Often, heat is used in the bonding of substrates, including substrates that comprise, for example, non-woven mats. Such heating can be carried out, for example, through radiative heating, ultrasonic vibration, placing substrates in contact with heated surfaces, and the like. Often, in these heating processes, heat is directed onto the substrate from the side of the substrate opposite the side to be bonded, resulting in full-thickness heating of the substrate. Often, in this connection, the structure of one or both substrates can be significantly altered. summary
[002] In this document, apparatus and methods for impacting heated fluids against substrate surfaces to heat substrate surfaces for the purpose of facilitating the melt bonding of substrates together to form a laminate are described. Also described are laminates in which a fibrous batt is bonded to a substrate in surface bonded fashion and/or is thickened retainer bonded. The substrate may comprise protrusions on the surface of the substrate opposite the surface that is attached to the fibrous web.
[003] In one aspect, a surface bonded laminate is described comprising a fibrous mat with a first and second oppositely facing main surfaces; and, a substrate with oppositely facing first and second main surfaces; wherein the first major surface of the fibrous batt is surface bonded to the first major surface of the substrate.
[004] In another aspect, a melt bonded laminate is described comprising a non-woven fibrous mat with a first and second oppositely facing main surfaces; and, a pre-formed substrate with oppositely facing first and second main surfaces; wherein the first major surface of the non-woven fibrous batt is melt bonded to the first major surface of the preformed substrate such that the bond between the fibrous batt and the preformed substrate is a thick retaining bond.
[005] In another aspect, a method of attaching at least one fibrous batt to at least one substrate is described, comprising impacting the heated fluid against a first main surface of a moving fibrous batt; impacting the heated fluid against the first main surface of a moving substrate; and, placing the first major surface of the fibrous batt in contact with the first major surface of the substrate such that the first major surface of the fibrous batt is melt bonded to the first major surface of the substrate. Brief Description of Drawings
[006] Figure 1 is a side view of an exemplary laminate comprising an exemplary fibrous mat that is surface bonded to an exemplary substrate with a thick retainer bond.
[007] Figure 2 is an illustrative description, in schematic side view in partial cross section, of a portion of a laminate comprising a fibrous mat with fiber portions bonded by surface to a substrate.
[008] Figure 3 is an illustrative description, in schematic side view in partial cross section, of a portion of a laminate comprising a fibrous mat with a portion of fiber embedded in a substrate.
[009] Figure 4 is an illustrative description, in schematic side view in partial cross section of a laminate comprising a fibrous mat with a portion of fiber fused to a substrate.
[0010] Figure 5 is a scanning electron micrograph taken at 130X magnification of an exemplary laminate comprising a non-woven fibrous mat surface bonded to a substrate.
[0011] Figure 6 is a scanning electron micrograph taken at 180X magnification of an exemplary laminate comprising a non-woven fibrous mat surface bonded to a substrate.
[0012] Figure 7 is a top view of two exemplary substrates bonded to an exemplary fibrous mat.
[0013] Figure 8 is a side view of an exemplary apparatus and method that can be used to bond a first substrate to a second substrate.
[0014] Figure 9 is an expanded side view in partial cutout of a portion of the exemplary apparatus and process of Figure 8.
[0015] Figure 10a is a diagrammatic cross-sectional illustration of a portion of an exemplary apparatus and process that can be used to impact heated fluid against a substrate and locally remove the impacted fluid.
[0016] Figures 10b and 10c describe additional ways where the exemplary apparatus and process of Figure 10a can be operated.
[0017] Figure 11 is a partial cutaway side view of an exemplary apparatus and process that can be used to impact the heated fluid against two substrates and locally remove the impacted fluid, and bond the two substrates together.
[0018] Figure 12 is a diagrammatic cross-sectional illustration of a portion of another exemplary apparatus and process that can be used to impact heated fluid against a substrate and locally remove the impacted fluid.
[0019] Similar reference numbers in the various figures indicate similar elements. Some elements may be present in similar or identical multiples; in these cases, the elements may comprise the same reference number, with one or more of the elements designated by an apostrophe (’) for reasons of convenience in description. Except where otherwise indicated, all figures and drawings in this document are not to scale and are selected for the purpose of illustrating different embodiments of the invention. In particular, the dimensions of the various components are shown for illustrative purposes only and no relationship between the dimensions of the various components should be inferred from the drawings, unless indicated. Although terms such as "top", "bottom", "top", "bottom", "below", "above", "front", "back", "outside", "inside", "top" and " below", and "first" and "second" may be used in this description, it is to be understood that these terms are used in their relative sense only, except where otherwise specified. Detailed Description
[0020] Shown in Figure 1 is a side perspective view of an exemplary laminate 150 comprising a fibrous batt 110 that is bonded to substrate 120. The fibrous batt 110 is composed of fibers 111, and comprises a first main surface 112. and an oppositely facing second main surface 113. (Those skilled in the art will recognize that surfaces 112 and 113 of mat 110 may not be perfectly flat and/or continuous physical surfaces as they are collectively defined by the outermost portions of certain fibers 111 of the blanket 110). Laminate 150 further comprises a substrate 120, which comprises first main surface 121 and an oppositely facing second main surface 122. Substrate 120 may optionally comprise protrusions 123 that project from main surface 122.
[0021] In the illustrated embodiment, the fibrous batt 110 is surface bonded to the substrate 120 (specifically, the first main surface 112 of the fibrous batt 110 is surface bonded to the first main surface 121 of the substrate 120). This means that the fibrous batt 110 is secured to the substrate 120 by means of some fibers 111 of the surface 112 of the batt 110 being surface-bonded to the first main surface 121 of the substrate 120. As shown illustratively in Figure 2, the designation that the fibers 111 are surface bonded to the first main surface 121 of the substrate 120 means that portions of the fiber surfaces 115 of fiber portions 114 of the fibers 111 are fusion bonded to the first main surface 121 of the substrate 120 in such a way as to substantially preserve the original (pre-bonded) shape of the first major surface 121 of the substrate 120, and substantially preserve at least some portions of the first major surface 121 of the substrate 120 in an exposed condition, in the bonded area per surface.
[0022] The requirement that surface bonding substantially preserve the original shape of the first main surface 121 means that surface bonded fibers can be distinguished from fibers that are bonded to a substrate in a way that results in fiber portions being fouled (by example, partially or completely encapsulated) in the substrate (as illustratively shown in Figure 3) at least by penetration of the fibers into the substrate, deformation of the substrate, and the like. Quantitatively, surface bonded fibers can be distinguished from embedded fibers 116 by at least about 65% of the surface area of the surface bonded fiber being visible above the substrate surface in the bonded portion of the fiber (although an inspection of more than an angle may be needed to visualize the entire surface area of the fiber). The substantial preservation of the original (pre-alloyed) shape of the substrate 120 may also be manifested by the absence of any gross change in the physical shape of the first main surface 121 (e.g., crimping, distortion, penetration of portions of substrate 120 into the interstitial spaces of the blanket 110, etc.).
[0023] The requirement that surface bonding substantially preserve at least some portions of the first main surface 121 in an exposed condition means that surface bonded fibers can be distinguished from fibers that are bonded to a substrate such that it results in fibers being sufficiently melted, densified, compacted, mixed etc. to form a continuous bond. A continuous bond means that the fibers immediately adjacent to the first main surface 121 of substrate 120 have mixed and/or densified sufficiently (eg, melted together so as to partially or completely lose their identity as individual fibers) to form a continuous layer of material at the top of, and in contact with, the first main surface 121. (Artists skilled in the art will recognize the possibility of occasional gaps, and the like, in a "continuous" layer, and will appreciate that, in this context, the term continuous can be interpreted to mean that, in a bonded area, the continuous densified fiber layer is on top of, and in contact with, at least about 95% of the area of the first major surface 121 of substrate 120). Therefore, surface bonded fibers can be distinguished from fibers bonded in a continuous bond by the presence of several exposed areas where the first main surface 121 of the substrate 120' is visible between the surface bonded fibers constituting the first main surface 112 of the fibrous blanket 110.
[0024] Scanning electron micrographs (at 130X and 180X magnification, respectively) of exemplary non-woven fibrous mats surface bonded to substrates are shown in Figures 5 and 6. In these micrographs, the previously described surface bonding of portions of fiber to the substrate surface is readily apparent, with minimal deformation or damage to the bonded fiber portions or the substrate, and with multiple exposed areas of the substrate surface being visible among the surface bonded fibers.
[0025] As defined herein, the term "surface bonded" means that a mat is melt bonded to a substrate primarily by the surface bonded fiber portions described above, and furthermore means that in the absence of such surface bonds to fibrous mat and the substrate would not remain attached to each other. Those skilled in the art will recognize that the term "surface bonded" as used in this manner does not cover situations where primary bonding between a fibrous web and a substrate occurs by some other fusion bonding mechanism (e.g., by fiber encrustation in the substrate, and the like), wherein the surface-bonded fiber portions are only occasionally found within the bonded area or areas of the mat. Therefore, those skilled in the art will appreciate that surface bonding as described in the present invention does not encompass such fusion bonding as is commonly obtained, e.g., by ultrasonic bonding, by compaction bonding (e.g., as obtained passing the substrates through a contact line heated at a relatively high pressure), extrusion lamination, and the like. These processes are well known to result in large scale deformation and/or physical changes of the fiber and/or substrate portions in bond formation. The elements skilled in the art will further assess that fibrous mats that are bonded to substrates that are still in a molten, semi-cast, soft, etc. state (such as extruded materials that have not yet been cooled, for example, in a solid condition), may not comprise a surface bond, as bonding to a substrate that is still at a high temperature and/or still considerably deformable can cause the fibers to become encrusted, can cause formation of a continuous link, or both.
[0026] Those of skill in the art will further recognize that although the embedded fiber portions, small-scale almost continuously bonded regions, and the like, may occasionally occur in a mat that has been surface bonded to a substrate as described in In the present invention, these features may only represent the inherent sporadic occurrence of such features in the binding process. As stated above, the term surface bonded means that although such embedded fiber portions and/or nearly continuously bonded fiber regions may be present to a small extent, most bonds between the fiber portions and the substrate are surface bonds so that in the absence of such surface bonds, any unforeseen bonding by way of embedded fibers and/or almost continuously bonded regions would be so insignificant that the fibrous mat and substrate would not remain bonded together.
[0027] Those skilled in the art will further recognize that although surface bonding of the fiber portions to a substrate as described in the present invention may lead to individual bonds that are weaker than the bonds obtained by embedding the fibers in the substrate or by continuously bonding the fibers to the substrate, surface bonding as described in the present invention can provide an acceptable bond between a fibrous mat and a substrate if performed over a sufficiently large area or areas. That is, surface bonding can advantageously be performed over a large area or areas (herein referred to as "area bonding"), as opposed to small area bonding (often called dot bonding) which is usually achieved by ultrasound bonding, and the like. Such bonding by area means that the large number of surface bonded fiber portions (which may be randomly and/or uniformly present in the bonded area) can collectively provide an adequate bond strength to the laminate 150 to be handled and performed satisfactorily in various uses finals. In various embodiments, such surface bonded areas between fibrous batt 110 and substrate 120 can comprise an area of at least about 100 mm square, at least about 400 mm square, or at least 1000 mm square. Therefore, the person skilled in the art will again be able to readily distinguish such area binding from site binding or point binding which are generally employed in other fusion binding processes.
[0028] At least through the methods presented here, surface bonding can be easily accomplished over a large proportion of the area of overlap or contact between a fibrous mat and a substrate. Specifically, fibrous batt 110 and substrate 120 may comprise an overlapping area (e.g., in which a first surface 112 of batt 110, and a first surface 121 of substrate 120, face each other and/or are in contact with each other). Of this overlapping area, at least about 70%, at least about 80%, at least about 90%, or substantially all of it may comprise an area or areas bonded by surface.
[0029] Surface bonding as presented herein may provide advantages over other fusion bonding methods. Specifically, within the bonded area, surface bonding can minimize any deformation of substrate 120 and can minimize the number of fibers 111 that become embedded in substrate 120 and/or are continuously bonded to substrate 120. Therefore, laminate 150 can remain quite flexible even in the connected area.
[0030] The surface bonding as presented herein can be accomplished to the point where the substrate 120 and the fibrous web 110 are not separable from each other, or without severely damaging one or both of the substrate 120 and the fibrous web 110.
[0031] In some embodiments, surface-bonded fibers may generally, or substantially, retain their original (pre-bonded) shape. In these embodiments, fibers bonded by shape-retaining surfaces can be distinguished from fibers that are bonded to a substrate by means of a fiber portion being fused to the substrate, (the term fused means that in the process of bonding the fiber portion has become substantially deformed from its original prebonded physical structure and shape, e.g., the fiber portion has become substantially flattened), as shown illustratively in Figure 4. Quantitatively, shape-retaining surface-bonded fibers can be distinguished from fused fibers 117 by surface-bonded fibers that remain sufficiently circular in cross-section by exhibiting an aspect ratio (i.e., a ratio of the longest cross-sectional dimension of the fiber to the smallest cross-sectional dimension) in the bonded portion of the fiber no greater than about 2.5:1 (as obtained by an average based on a series of fibers. presentations). In various embodiments, the fibers can comprise an aspect ratio no greater than about 2:1, or no greater than about 1.5:1. Those skilled in the art will appreciate that this method of identifying fibers bonded by shape retaining surfaces may only be suitable for fibers of generally circular cross-sectional shapes as originally produced; if fibers of other shapes are used, it may be necessary to compare the cross-sectional shape of the fibers as originally produced with the shape after a binding operation, in order to make the determination. Likewise, those skilled in the art will recognize that some cross-sectional shape deformation of some portion of some fibers bonded by shape-retaining surfaces may occasionally occur due to the presence of other fibers in contact with the fiber portions while the fibers are at a high temperature (some of these occurrences are visible in Figure 6). Shape-retaining surface-bonded fibers that exhibit a deformation for this reason should not be considered to be the same as fused fibers.
[0032] In the illustrated embodiment of Figure 1, the fibrous batt 110 is attached to the substrate 120 by means of a thick retainer connection. This means that the fibrous web 110 is melt bonded to the substrate 120 such that the fibrous web 110 retains a significant amount of the thickness exhibited by the fibrous web 110 prior to the bonding process. Thickness is a term of the art in relation to fibrous mats, and is a measure of the degree of openness, lack of compaction, presence of interstitial spaces, etc., within a fibrous mat. As such, any common thickness measurement can be used. For reasons of convenience, in this document, the thickness of a fibrous mat will be represented by the ratio between the volume occupied by the mat (including fibers as well as the interstitial spaces of the mat that are not occupied by fibers) and the volume occupied only by the material of the fibers. Using this measurement, a thickness retaining bond as described in the present invention is defined as one in which the bonded fibrous batt 110 comprises a thickness that is at least 80% of the thickness exhibited by the batt before, or in the absence of, a process. binding. If only a portion of the fibrous batt 110 has substrate 120 bonded thereto, the retained thickness can be easily ascertained by comparing the thickness of the batt in the bonded area to that of the batt in an unbonded area. If the entire fibrous batt 110 has substrate 120 bonded to it (or if the batt in an unbonded area has also undergone compaction during the bonding process), it may be necessary to compare the thickness of the bonded batt to that of a sample of the same blanket before being turned on. In various embodiments, laminate 150 comprises a thickness retaining bond such that fibrous batt 110 comprises at least 90%, at least 95%, or substantially all of its prebonded thickness.
[0033] Those skilled in the art will recognize that in some embodiments the laminate 150 may not comprise a surface bonded laminate as described in the present invention (e.g., a significant number of fibers 111 comprising the first main surface 112 of fibrous batt 110 may be embedded in substrate 120 and/or continuously bonded to substrate 120), however, in such cases, fibrous batt 110 may be bonded to substrate 120 in a thick retaining bond.
[0034] Thickness retaining bond as shown herein may provide advantages over other fusion bonding methods. Specifically, within the bonded area, the thick retaining bond can leave the fibers of the fibrous batt 110 that are not on the first major surface 112 of the batt 110 intact and/or non-fusion bonded to the substrate 120. Therefore, the batt fibrous mat 110 may remain thick, resilient and/or flexible even in the bonded area (in these cases, the fibrous mat 110 may be more easily engageable by male fasteners, may have a tactile feel and/or a more pleasing appearance, etc.) . In contrast, other bonding methods may disadvantageously crush or densify all or nearly all of the fibers in the bonded area and/or may melt bond them to the substrate, with loss of desirable properties such as thickness and flexibility. Therefore, those skilled in the art will appreciate that the thickness retaining bond as described in the present invention does not encompass such fusion bonding as is commonly obtained, e.g., by ultrasonic bonding, by bonding by compaction (e.g., as per obtained by passing the substrates through a contact line heated at a relatively high pressure), by extrusion lamination and the like, when such processes result in significant crushing and/or densification of the bonded mat.
[0035] Those skilled in the art will recognize that other bonding methods, e.g., supplemental stitch bonding, may be used at certain locations on the laminate in addition to the surface bonding and/or thick retaining bonding described herein, e.g. if you want to accentuate the link as a whole.
[0036] Although the methods presented here (e.g., collision of heated fluid on the surfaces of two converging substrates; or, collision of heated fluid on the surfaces of two converging substrates with local removal of the impacted heated fluid) may be particularly suitable for the production of surface bonded laminates, bonded laminates with retained thickness, or both, the elements skilled in the art will appreciate, based on the descriptions contained herein, that other methods may also be suitable. Such methods can include any process by which heat can be imparted to the first surfaces of two substrates such that the first surfaces of the two substrates can be melt bonded together to obtain the structures described herein.
Substrate 120 may be any substrate to which it is desired to surface bond fibrous web 110. Substrate 120 may be produced from any suitable thermoplastic polymeric material (e.g., a material that is melt bondable). Such materials can include, for example, polyolefins, polyesters, polyamides, and various other materials. Examples of suitable polyolefins include polyethylene, polypropylene, polybutylene, ethylene copolymers, propylene copolymers, butylene copolymers, and copolymers and blends of these materials. The substrate can comprise various additives and the like, as are well known in the art, so long as such additives do not unacceptably reduce the ability of the substrate to be melt bonded. Substrate 120 may be multilayer, e.g., a coextruded multilayer film, as long as the first major surface 121 is capable of being melt bonded to at least some of the fibers of fibrous batt 110.
[0038] In some embodiments, substrate 120 may comprise a preformed substrate, this means that substrate 120 is a pre-existing film previously produced whose physical properties in general have been fully developed. This should be contrasted, for example, with a case where a substrate is produced (eg extruded) and generally taken directly in the bonding process described here in a condition in which it is still generally molten, semi-molten, soft, or similar.
[0039] The substrate 120 can have any desired thickness. In various embodiments, the thickness of substrate 120 (not including the height of the protrusions) can be less than about 400 microns, less than about 200 microns, less than about 100 microns, or less than about 50 microns. In some embodiments, substrate 120 does not comprise any adhesive (i.e., hot-melt adhesive, pressure-sensitive adhesive, and the like), e.g., in the form of coatings on a major surface of the mat.
[0040] In some embodiments, the substrate 120 may be continuous, that is, without any penetrating through holes. In other embodiments, substrate 120 can be discontinuous which comprises, for example, penetrating through perforations and the like. In some embodiments, substrate 120 can be composed of a dense, non-porous material. In some embodiments, substrate 120 can be composed of dense, porous material. In particular embodiments, substrate 120 can comprise a fibrous batt, for example, a non-woven fibrous batt.
[0041] In some embodiments, the first main surface 121 and the opposite second main surface 122 of the substrate 120 may be free of protrusions. In other embodiments, the optional protrusions 123 may protrude from the second main surface 122 of the substrate 120, as shown in the exemplary design of Figure 1. (In this particular design, the protrusions 123 are on the opposite side of the substrate 120 from the side to which it should be connected). Protrusions 123 can be of any desired type, shape or design, present and any desired density per area of substrate 120, as desired for any suitable purpose. Protrusions 123 can be integral (i.e., of the same composition, and formed at the same time as a unit) to substrate 120.
[0042] In various embodiments, the protrusions 123 can comprise a maximum height (above surface 122) of at most about 3 mm, about 1.5 mm, about 0.8 mm, or about 0.4 mm . In additional embodiments, the protrusions 123 can comprise a minimum height of at least about 0.05 mm, about 0.1 mm, or about 0.2 mm. In various embodiments, the protrusions 123 can comprise an aspect ratio (the ratio of the height of the protrusion to the largest width of the protrusion) of at least about 2:1, at least about 3:1, or at least about 4:1.
[0043] In some embodiments, the protrusions 123 comprise male fastening elements, for example, hooks, of the type that are capable of interconnecting with a fibrous material and that can serve as the hook component of a supposed hook closure system and snare. Any male fastening elements can be used. In particular embodiments, fastening elements comprising a rod and a relatively large head (which may, for example, have a generic mushroom shape, a flat disc, and the like) of the general type described in US patents 6,558 may be used. .602, 5,077,870, and 4,894,060. Suitable substrates with protrusions comprising male fasteners include, for example, those products available from the 3M Company, St. Paul, MN, USA, under the trade designations CS200 and CS 600. Other suitable substrates include, for example, those described in US Patents 7,067,185 and 7,048,984.
[0044] The bonding as described in the present invention may be particularly advantageous in melt bonding a fibrous mat 110 to a substrate 120 comprising protrusions 123 (in particular, male fasteners), because bonding may be able to be performed no significant damage (eg, deformation, crushing, flattening, etc.) to the lumps in the bonded area. Therefore, in some embodiments, the bonding processes as described in the present invention are performed such that the substrate 120 of laminate 150 comprises protrusions 123 that have not been significantly damaged. The term "not significantly damaged" means that upon visual inspection (eg, using a microscope powerful enough to reveal details of individual protrusions), no more than one protrusion out of ten protrusions exhibits any damage such as deformation, crushing, melting, and the like, when compared to lumps that have not been subjected to the bonding process. In additional embodiments, less than one bulge in twenty exhibits damage. In a further modality, substantially all of the bulges are undamaged. For the particular case where the substrate protrusions are male fasteners, the absence of significant damage to the protrusions can also be manifested in the retained peel performance of the substrate. For example, when fitted to any suitable loop component and subjected to any of the well-known peel tests for quantitatively characterizing the performance of components of hook and loop closure systems, the substrate, after being subjected to the bonding processes described herein , can retain at least about 80 percent of the peel performance of the originally produced substrate. In various embodiments, the peel performance of the substrate can remain at least about 90%, or at least about 95%, of the peel performance of the originally produced substrate. Those skilled in the art will appreciate that many bonding processes significantly or even completely compress all of the bulges in the process of obtaining a bond and will therefore re-evaluate the fundamental differences between the bonding methods and bonded laminates presented herein, and those presented in technique.
The fibrous batt 110 may be any suitable fibrous batt with sufficient mechanical strength to be handled as a self-supporting batt and subjected to the bonding processes described herein. As such, it will be understood that laminate 150 as described in the present invention does not encompass any article that does not comprise a pre-existing self-supporting fibrous batt that is laminated to a substrate (such non-covered articles may include, for example, blown fibers melt (meltblown) deposited on a scrim, and the like).
[0046] In some embodiments, the fibrous mat 110 may comprise woven fibers such as those obtained by weaving, knitting, suturing and the like. As such, the fibrous batt 110 may be composed of a suitable fabric or textile, provided the materials comprising the fibers are suitable for the bonding described herein. Therefore, although batt 110 may occasionally be, for the sake of illustrative convenience, called a non-woven fibrous batt, it is understood that batt 110 may comprise any suitable fibrous material.
[0047] In some embodiments, the fibrous batt 110 comprises a non-woven fibrous batt. Any suitable self-supporting non-woven fibrous mat 110 can be used, produced from any desired material, so long as the bonding described herein can be made. The non-woven fibrous batt 110 may be, for example, a carded batt, a continuous spinning batt, a hydro-entangled batt, a batt produced by airlaid, or a batt produced by extrusion into blocks with air passage hot at high speed (meltblown) (ie, provided such mat has undergone sufficient processing to make it self-supporting). The non-woven fibrous batt 110 may be a multilayer material with, for example, at least one layer of a batt produced by extrusion into blocks with high velocity hot air flow (meltblown) and at least one layer of a spinning batt. continuous, or any other suitable combination of non-woven mats. For example, the non-woven fibrous batt 110 can be a continuous-spin-fusion-bonded-continuous spinning, continuous-spinning-continuous-spinning, or continuous-spinning-continuous-spinning multilayer material. Or, the mat may be a composite network comprising a non-woven layer and a dense film layer, as exemplified by mats comprising non-woven fibers bonded in loops that protrude in an arc shape to a dense film backing and available from 3M Company, St. Paul, MN, USA under the tradename Extrusion Bonded Loop.
[0048] The fibrous batt 110 may be produced from any suitable thermoplastic polymeric material (eg, a material that is melt bondable). Such materials can include, for example, polyolefins, polyesters, polyamides, and various other materials. Examples of suitable polyolefins include polyethylene, polypropylene, polybutylene, ethylene copolymers, prolylene copolymers, butylene copolymers, and copolymers and blends of these materials. Those skilled in the art will appreciate that the composition of the fibrous batt 110 can be advantageously chosen in order to improve the melt bonding to the substrate 120. For example, at least the main surface 121 of the substrate, and at least some of the fibers of the batt fibrous, may, for example, be substantially composed of a polypropylene.
[0049] The fibrous batt 110 may have any suitable weight basis as desired for a particular application. Suitable weight bases can range, for example, from at least about 20, 30 or 40 grams per square meter, to at most about 400, 100 or 100 grams per square meter. The fibrous batt 110 may comprise any suitable thickness as described above in the present invention. The fibrous batt 110 can comprise any suitable thickness. In various embodiments, the fibrous batt 110 can be at most about 5 mm, about 2 mm, or about 1 mm, thick. In additional embodiments, fibrous batt 110 can be at least about 0.1, about 0.2, or about 0.5 mm thick.
[0050] In some embodiments, some or all of the fibers 111 of the fibrous batt 110 may comprise monocomponent fibers. In some embodiments, fibrous batt 110 may also comprise bicomponent fibers, for example, which comprise a sheath of a lower melting point material that surrounds a core of higher melting point material. If desired, the wrapper material can be chosen in order to improve its melt bonding ability to substrate 120. Other fibers (eg staple fibers and the like) may be present. In some embodiments, the fibrous batt 110 does not comprise adhesives (i.e., hot-melt adhesive, pressure-sensitive adhesive, and the like) that may be present in the form of adhesive particles, binders, or the like, distributed along the batt or in a main surface of the blanket. In some embodiments, the fibrous batt 110 comprises certain fibers having a composition advantageously suitable for the surface bonding described herein, and other fibers having a different composition than the surface bonding fibers.
[0051] In certain embodiments, the fibrous batt 110 comprises an extended portion that is not overlapping with the substrate 120. (Through the methods described herein, the exposed surface of the extended portion of the fibrous batt 110 may remain generally unaffected by the exposure. to heat during the bonding process (ie, the exposed surface is not burned or glassy or any similar condition indicative of an unacceptably high heat exposure). This extended portion of the fibrous batt 110 can be used, for example, as an attachment area through which laminate 150 can be attached to an item. A configuration of this type is shown exemplarily in Figure 7, where at least one substrate 120 is present as a narrow strip over a greater width of fibrous batt 110. An individual piece 160 of laminate 150 can be removed by cutting along the length. phantom line shown, the individual piece 160 comprising an extended portion 161 that can be used to secure the piece 160 to an item. In the particular embodiment shown in Figure 7, an additional extended portion 162 of fibrous batt 110 is provided which extends in the opposite direction to the extended portion 161, and may serve, for example, as a lifting tab in the case where the piece 160 is used as a hook-lift component of a hook-and-loop closure system (ie, as a hook-lift flap). As may be useful in this application, the exemplary substrate of Figure 7 comprises protrusions 123 (which may be male fasteners, for example) that project from the second major surface 122 of substrate 120.
[0052] In the particular embodiment illustrated in Figure 7, the substrate 120 is present as two strips over a greater width of fibrous batt 110, with a laterally extending portion of fibrous batt 110 externally delimiting each strip of substrate 120 and with an extended portion additional fibrous batt 110 laterally between the substrate strips. From this laminate, individual pieces 160 can be cut, each piece with a fastening portion 161 and a lifting flap portion 162, for example, for fastening to items such as toiletries (e.g. diapers, care products personal, and the like). Attachment of portion 161 to an item can be accomplished by any method known in the art, e.g., ultrasonic attachment, adhesive attachment, etc.
[0053] In summary, the bonding processes described herein involve impacting the heated fluid (i.e., gaseous fluid) against a first main surface of a moving first substrate and impacting the heated fluid against a first main surface of the moving second substrate . In some embodiments, the moving substrates can be converging substrates, meaning the substrates are moving on a converging path in which the first major surface of the first substrate contacts the first major surface of the second substrate. As shown herein, the collision of heated fluid against a first surface of a moving substrate can raise the temperature of the first surface of the substrate sufficiently for bonding to be achieved, without necessarily raising the temperature of the remaining portions of the substrate (e.g., the interior of the substrate and/or the opposite second main surface of the substrate) to a point sufficient to cause unacceptable physical changes or damage. In the specific case of bonding a fibrous web to a substrate, in some embodiments, the temperature of the fluid impacted surfaces of the fibrous web and the substrate can be high enough to obtain the surface bonding described above, for example, without causing the fibers become embedded in the substrate, and/or without causing melting, densification and/or solidification of the fibers immediately adjacent to the substrate surface to cause the formation of a continuous bond.
[0054] Those skilled in the art will recognize the bond described herein as a fusion bond, that is, where the molecules of the first surface material and the substrate surface material intermix while in a heated state achieved by the collision of the heated fluid and then remain intermixed upon cooling and solidification. Those skilled in the art will also appreciate that the heated fluid collision methods described herein are not limited to forming surface bonded laminates as described in the present invention, and can be used for additional purposes, for example, to achieve a melt bond which does not fall within the definition of surface bonding for use in the present invention, and even for purposes other than fusion bonding.
[0055] In some embodiments, the collision of the heated fluid against a first main surface of a first moving substrate and the collision of the heated fluid against a first main surface of a second moving substrate are performed simultaneously, with the fluid collision heating continues substantially until such time as the first main surfaces of the substrate are brought into contact with each other.
[0056] Shown in Figure 8 is an exemplary apparatus 1 that can be used at least to obtain a surface bonding described above. In these embodiments, the first substrate 110 (e.g., a fibrous mat) and the second substrate 120 (e.g., a substrate optionally containing bulges) are each in contact with a respective support surface during fluid collision. heated against the first main surface of each substrate. This support surface can serve to support the substrate, and it can also be cooled to a certain degree (eg 100, 200, or 300 or more degrees C below the collision temperature of the heated fluid) to aid in maintaining the rest of the substrate cool enough to prevent or minimize damage, melting, etc., of the substrate, during the time the first main surface of the substrate is heated in order to facilitate surface bonding. If a substrate is discontinuous or porous (for example, if the substrate is a fibrous mat) such support surface may also serve to occlude the second main surface of the substrate such that collision fluid does not penetrate through the thickness of the substrate and exit through the second main surface. Therefore, in these embodiments, heating a main surface of a substrate through the collision of heated fluid as described in the present invention does not encompass methods in which the heated fluid is impacted against a main surface of a substrate and passed through the substrate with the purpose of exiting through the opposite main surface.
[0057] In some embodiments, the support surface may be provided by a support cylinder. Therefore, in the exemplary illustration of Figure 8, the second main surface 113 of the substrate 110 is in contact with the surface 231 of the support cylinder 230 during the collision of the heated fluid against the first main surface 112 of the substrate 110. Similarly, the second main surface 122 of the substrate 120 (or the outermost surface of the protrusions 123, if such protrusions are present) is in contact with the surface 221 of the support cylinder 220 during the collision of the heated fluid against the first main surface 121 of the substrate 120.
[0058] In some embodiments, a preheat cylinder can be used to preheat a surface of one or both substrates 110 and 120 prior to collision of the heated fluid. In the exemplary illustration of Figure 8, the main surface 121 of the substrate 110 is placed in contact with the surface 211 of the preheat cylinder 210 before the heated fluid collides with the main surface 121 of the substrate 110.
[0059] In the illustrated embodiment of Figure 8, the support roller 220 and the support roller 230 combine to form a lamination contact line 222 in which the first main surface 112 of the substrate 110 and the first main surface 121 of the substrate 120 are placed in contact with each other while at a temperature (set by the collision of heated fluid) sufficient to cause at least one surface bond of substrates 110 and 120 to each other. As mentioned earlier herein, it may be advantageous to perform such bonding under conditions that minimize damage, crushing and the like, to any component of substrates 110 and 120. This may be particularly useful in the case where, as shown in Figure 8, substrate 120 comprises bulges (for example, which may be susceptible to being deformed or crushed). Therefore, support cylinders 230 and 220 can be arranged so that they operate contact line 222 at a very low pressure compared to pressures normally used in rolling materials (for which a relatively high pressure is generally preferred). In various embodiments, bonding the substrates 110 and 120 together can be accomplished with a rolling contact line pressure less than about 27 Newtons per linear cm (15 pounds per linear inch), less than about 18 Nlc (10 pli), or less than about 9 Nlc (5 pli). In other embodiments, support roller 230, support roller 220, or both, may comprise at least one surface layer of a relatively soft material (e.g., a rubber material with a hardness content of less than 70 on the scale. Shore A). Such a relatively soft surface layer can be obtained, for example, through the use of a cylinder with a permanently attached soft surface coating, through the use of a removable sleeve of soft material, by coating the surface of the support cylinder with a resilient and relatively soft tape, and the like. If desired, the surface of one or both support rolls can be staggered along the face of the roll to selectively provide rolling pressure at certain locations.
[0060] Upon the output of the lamination contact line 222, the laminate 150 (which in some modes can be surface bonded, bonded with thickness retention, or both) can be cooled if desired, for example, by placing one or both of the main surfaces of laminate 150 in contact with a cooling cylinder, by the collision of a cooling fluid against one or both surfaces of laminate 150, and the like. Thereafter, laminate 150 can be processed through any suitable mat handling process, rolled, stored, etc. For example, additional layers can be coated or laminated onto laminate 150, individual pieces can be cut therefrom as described above, and so on.
[0061] As mentioned, the attachment apparatus and methods described herein may be particularly advantageous for bonding substrates comprising easily crushed protrusions. Furthermore, the apparatus of bonding methods described herein may be particularly suitable for bonding porous materials such as fibrous batts. Such mats may comprise a self-insulating capability such that the first main surface of the fibrous mat can be heated by the collision of the heated fluid, while the remainder (second inner and main surface) of the mat remains relatively cool. (Some unforeseen additional fiber-fiber bonding may occur in the fibrous mat during heat exposure). The bonding processes as described in the present invention may also be especially suitable for bonding fibrous batts to a substrate while retaining the fibrous batt thickness as mentioned above.
[0062] Those skilled in the art will appreciate that heating multiple substrates, e.g., converging substrates, by impacting the heated fluid against a first main surface of a moving first substrate and impacting the heated fluid against a first surface principal of a second moving substrate (in particular as obtained by using the nozzles described below in this document), may be suitable for many uses, including uses other than the aforementioned bonding or surface bonding. For example, these methods can be used to evaporate liquids from substrates, modify the surface structure of substrates through annealing or the like, promote a chemical reaction or surface modification, dry, harden, and/or crosslink a coating present on the surface, and so on.
[0063] The collision of the heated fluid against the first main surface 112 of the substrate 110, and the collision of the heated fluid against the first main surface 121 of the substrate 120, can be achieved through the use of the nozzle 400. An exemplary type nozzle 400 shown in figure 8 is shown in greater detail in figure 9. As shown in side view in figure 9 (observed along an axis transverse to the direction of movement of substrates 110 and 120, i.e. an axis aligned with the long axes of the substrates 110 and 120). support cylinders 220 and 230), the nozzle 400 comprises at least a first fluid dispensing outlet 420, through which the heated fluid can be impacted against the first main surface 112 of the substrate 110, and a second fluid dispensing outlet 430 through which the heated fluid can be impacted against the first main surface 121 of the substrate 120. fluids, second outlet for fluid dispensing, etc. are used for the convenience of differentiating separate outputs, etc. from each other, and should not be interpreted as requiring that fluids distributed through different outlets etc. must be different in composition). The first fluid distribution outlet 420 is supplied with heated fluid from the first fluid distribution channel 421 to which it is fluidly connected, and the second fluid distribution outlet 430 is supplied with heated fluid from the second fluid distribution channel 431 to which it is fluidly connected. In some embodiments, the nozzle 400 may comprise a single internal filled space (chamber) supplied with heated fluid from an external source (not shown) via feed line 410, with the heated fluid being directed to the first and second fluid dispensing outlets 420 and 430 from the single common filled space and the first and second fluid dispensing outlets 420 and 430 therefore comprise first and second portions of a single continuous fluid dispensing outlet. Therefore, in these embodiments, the first and second fluid distribution channels 421 and 431 are portions of a single common filled space rather than being physically separate channels, and the first and second fluid distribution outlet portions 420 and 430 will deliver the heated fluid from a common source under similar or identical conditions (in this case, outlet portions 420 and 430 may simply be opposite portions of a single outlet).
[0064] In alternative embodiments, the interior of the nozzle 400 may be divided (e.g., by an optional interior partition 422 of Figure 9) into the first fluid distribution channel 421 and the second fluid distribution channel 431 which are physically separate and they are not fluidly connected to each other. In this case, the second fluid distribution channel 431 and the second fluid distribution outlet 430 can be supplied, through the second fluid supply line 411, with a heated fluid that is different (e.g., air in a different temperature, pressure, speed, etc.) of the heated fluid supplied to the first fluid distribution channel 421 and the first fluid distribution outlet 420.
[0065] Although the exemplary nozzle 400 of Figures 8 and 9 is shown as a single unit from which the heated fluid can be impacted against the first main surface 112 of the substrate 110 and against the first main surface 121 of the substrate 120, it will be appreciated that the collision discussed herein can be accomplished, for example, through the use of two adjacent but physically separate units, one of which impacts the heated fluid through the fluid delivery outlet 420 against the first main surface 112 of the substrate 110 and the other impacts the heated fluid through fluid delivery outlet 430 against the first main surface 121 of substrate 120. Therefore, although the term "nozzle" is used herein for convenience of discussion, it should be understood that the apparatus (eg, nozzle) encompasses apparatus in which a single unit impacts the fluid against both substrates as well as an apparatus of and multiple units in which one unit impacts fluid against one substrate and the other unit (which may be a physically separate unit) impacts fluid against the other substrate.
[0066] Typically, the nozzle 400 will comprise solid (i.e., waterproof) partitions 442 and 442' which collectively define the fluid distribution channels 421 and 431. The terminal ends of the partitions 442 and 442' that are closest to the substrate 110 may collectively define fluid dispensing outlet 420 (and may be the only elements defining fluid dispensing outlet 420 if outlet 420 does not comprise a fluid permeable sheet (described in detail later) on its working face. Similarly, the terminal ends of partitions 442 and 442' that are closest to substrate 120 can collectively define fluid dispensing outlet 430.
[0067] The partitions 442 and 442' may be positioned generally parallel to each other (e.g., similarly as shown in Figure 10a for the partitions 542 and 542', which define the fluid distribution channel 521 of the nozzle 500 in a manner similar to that where partitions 442 and 442' define the fluid distribution channel 421 of the nozzle 400), if it is desired that the fluid distribution channels 421 and/or 431 have a constant width. Or, the width between partitions 442 and 442' may vary if desired, for example, to provide a fluid distribution channel that narrows or expands as the fluid progresses along the channel. In addition to the partitions 442 and 442', the nozzle 400 may comprise one or more partitions 415 that define the rear portion of the nozzle 400 (distanced from the fluid dispensing outlets). Therefore, the nozzle 400 may comprise at least partitions 442, 442', and 415, which collectively provide an enclosure in which heated fluid can be supplied from feed line 410 (and feed line 411, if present), with the primary, or unique, paths for the heated fluid to exit nozzle 400 being through fluid dispensing outlets 420 and 430.
[0068] For convenience of description, the first fluid dispensing outlet 420 is characterized by comprising a working face 424, which may more conveniently be considered to be the surface through which the heated fluid passes as it exits output 420. Working face 424 may be an imaginary surface, such as an imaginary arcuate surface (eg, a section of a cylindrical surface) defined by terminal ends of partitions 442 and 442'. Or, working face 424 may comprise a physical layer, e.g., a fluid permeable sheet, as discussed later in this document in greater detail. The second fluid dispensing outlet 430 is similarly characterized by comprising a working face 434.
[0069] Each output and working face thereof may have a circumferential length, and a lateral width (extending in a direction transverse to the direction of movement of the adjacent substrate, that is, extending in a direction aligned with the long axes adjacent support cylinder). In some embodiments, the circumferential length may be longer than the lateral width such that the outlet is circumferentially aligned. Although in the exemplary illustration of Figure 8, the first fluid dispensing outlet 420 extends along the entire circumferential length of the face of the nozzle 400 that is adjacent to the cylinder 230 (with the second fluid dispensing outlet 430 extending from similarly along the entire circumferential length of the face of the nozzle 400 that is adjacent to the cylinder 220), in some embodiments, each face of the nozzle 400 may comprise multiple separate fluid delivery outlets. These multiple outlets can be defined by laterally oriented dividers and can be spaced along the circumferential length of one face of the nozzle, as shown in Example Set 3.
[0070] The first fluid dispensing outlet 420, and the second fluid dispensing outlet 430, are in a divergent relationship. The term divergent relationship can be defined by means of shaft 423 drawn normal to working face 424 of first fluid dispensing outlet 420, and shaft 433 drawn normal to working face 434 of second fluid dispensing outlet 430, as described in Figure 9. The term divergent relationship means that the normal shaft 423 of the first fluid distribution outlet 420, and the normal shaft 433 of the second fluid distribution outlet 430, when extended from their respective working faces in one direction away from mouthpiece 400, do not intersect Regardless of how extended they are. The term divergent relationship further means that the normal axis 423 and the normal axis 433 are oriented at least 25 degrees away from each other (by way of example, in Figure 9, the normal axis 423 and the normal axis 433 are oriented approximately 90 degrees apart). In various embodiments, the normal axes 423 and 433 are oriented at least about 40, at least about 60, or at least about 80 degrees apart. In additional embodiments, the normal axes 423 and 433 are oriented at most about 140, at most about 120, or at most about 100 degrees apart.
[0071] Those skilled in the art will realize that in modalities with arcuate fluid distribution outlets (described in more detail below), the relative orientation of the normal axes 423 and 433 may vary with the circumferential location along each outlet in which the normal axis is positioned. In such cases, the denotation that two outlets for fluid distribution are in a divergent relationship means that at least the portions of the two outlets are in close proximity to each other (for example, the portions of outlets 420 and 430 that are proximal to the protrusion 435) find themselves in a divergent relationship. In some cases, for example, where at least one of the fluid dispensing outlets is circumferentially extended to form, for example, an almost semi-cylindrical shape, a portion of such a fluid dispensing outlet that is distal to the other dispensing outlet of fluids (eg, distal to protrusion 435) may not be in a divergent relationship with any or none of the portions of the other fluid dispensing outlet. This case will be described below with reference to Examples 1-3. However, in these cases, provided that the condition described above is met in which at least the portions of the two outlets that are in close proximity to each other are in a divergent relationship, the fluid distribution outlets are still considered to be in a divergent relationship as defined here.
[0072] The first and second fluid distribution outlets 420 and 430 arranged in a divergent relationship as described herein may be particularly advantageous for directing heated fluid over two converging substrates. In particular, these outlets for dispensing fluids in a diverging relationship allow the nozzle 400 to be placed closely adjacent to a rolling contact line established by support rollers, for example, in the manner described in Figures 8 and 9. Although it is discussed primarily in the context of bonding substrates together, it will be appreciated that the use of fluid dispensing outlets arranged in a divergent relationship may find other uses in heating substrates for other purposes.
[0073] In the exemplary illustration of Figures 8 and 9, the first fluid dispensing outlet 420 is arcuate with the working face 424 which is generally congruent (i.e., generally similar in shape and parallel) to the adjacent surface of the cylinder. support 230. This may be advantageous in allowing the working face 424 of the first fluid dispensing outlet 420 to be placed in close proximity to the support cylinder 230. working 424 of the first fluid dispensing outlet 420 may be less than about 10, 5 or 2 mm from the first main surface 112 of the substrate 110 at the closest approach point. Similarly, in the exemplary illustration of Figures 8 and 9, the second fluid dispensing outlet 430 is arcuate with a working face 434 that is generally congruent to the adjacent surface of support cylinder 220. This may be advantageous in allowing the working face 434 of second fluid dispensing outlet 430 is placed in close proximity to support cylinder 220. In various embodiments, in operation of nozzle 400, working face 434 of second fluid dispensing outlet 430 may be smaller than about 10, 5 or 2 mm from the first main surface 121 of substrate 120 at the closest approach point.
[0074] In particular embodiments, the first fluid dispensing outlet 420 is arcuate to a working face 424 that is generally congruent to the adjacent surface of the support cylinder 230, and the second fluid dispensing outlet 430 is arcuate to a face 434 which is generally congruent to the adjacent surface of support cylinder 220. This can allow the nozzle 400 to be positioned such that each working face of each fluid delivery outlet is fairly close to the first main surface of its respective substrates.
[0075] In embodiments in which outlets 420 and 430 are desired to be closely fitted to the adjacent surface of the (cylindrical) support cylinders, the working face of each outlet may comprise an arcuate shape that is a section of a generally cylindrical surface with a radius of curvature compatible with that of the surface of the support cylinder to which the outlet is to be fitted. In situations where support cylinder 220 and support cylinder 230 have the same diameter, the two fluid delivery outlets may be symmetrical with the same radius of curvature. However, if support cylinder 220 and support cylinder 230 have different diameters, as in the embodiment shown in Figures 8 and 9, the curvature of the first fluid dispensing outlet 420 may be different from that of the second fluid dispensing outlet 430 .
[0076] The circumferential length of each arcuate exit can be different if desired. For example, in Figures 8 and 9, the circumferential length of outlet 420 is longer than that of outlet 430. Optionally, one or both outlets may comprise an adjustable shutter (not shown in any figure) that can be adjusted for purpose. to change the circumferential length of the output. This shutter can be used to adjust the dwell time of a substrate in the collision of heated fluid, for example, independently of the substrate's moving speed. In operating apparatus 1, the position of the shutter, as well as other process variables such as fluid temperature, fluid flow rate, support cylinder temperatures, etc., can be manipulated as desired, for example, with a view to linear speed, thickness and other properties of the particular substrates being processed.
[0077] The fluid dispensing outlet 420 and the fluid dispensing outlet 430 can be chosen as having any suitable lateral width. For use in the present invention, lateral means the direction transverse to the direction of movement of a substrate to be heated and in a direction parallel to the long axis of the support cylinder (i.e., the in-plane and out-of-plane direction in Figures 8 and 9) . In some embodiments, particularly those where at least one of the substrates to be bonded is in the form of a narrow strip (e.g., as in the exemplary embodiment of Figure 7), it may be desirable that the lateral width of the fluid distribution outlet be relatively narrow (for example, chosen in consideration of the width of the substrate to be bonded). In this case, it may be additionally desirable that the fluid dispensing outlet be elongated (e.g. circumferentially elongated) in a direction substantially aligned with the long axis, and in the direction of movement, of the substrate to be bonded (keeping in mind that the axis length and the direction of movement of the substrate can be arched when the moving substrate is supported by a support roller). For example, in Figure 9, the working face 424 of the outlet 420 is circumferentially elongated along an axis that is substantially aligned with the long axis and direction of movement of the substrate 110.
[0078] A circumferential end of the first fluid dispensing outlet 420, and a circumferential end of the second fluid dispensing outlet 430, may be positioned adjacent to each other to form a protruding protrusion 435, as shown exemplarily in Figure 9. The angle of approach of the two outlets to each other can be such that the protrusion 435 takes the form of a relatively sharp protrusion, with the working face 424 of the outlet 420, and the working face 434 of the outlet 430 being at an acute angle to each other at their closest point of approach or contact. Such a sharply protruding design can advantageously allow the protrusion 435 to be positioned deep in the converging contact line region between the support rollers 220 and 230 and can allow the heated fluid to be impacted against the substrates substantially up to instant in which the substrates come into contact with each other. In various embodiments, at their closest approach point, the closest approach work face 424 of the exit 420 and the work face 434 of the exit 430 may be at an angle to each other of less than about 70, less than about 50, or less than about 30 degrees.
[0079] In some embodiments, the work surface of an outlet for fluid distribution may not be congruent to the support cylinder to which it is fitted. For example, one or both of the outlets 420 and 430 may be generally flat (smooth) rather than arcuate as shown in Figures 8 and 9. Although this may mean that the fluid dispensing outlet may not be able to be positioned so closely together. to the support cylinder, and the distance from the working face to the support cylinder may vary along the length of the fluid dispensing outlet, may still be acceptable in some cases.
[0080] As mentioned, the working face of an outlet for fluid distribution can be opened; or, it can comprise a fluid permeable sheet through which the heated fluid can be passed. Such a fluid permeable sheet can make the heated fluid flow through the outlet more uniform, for example, along the circumferential length of the outlet. Additionally, depending on the characteristics of the sheet, it may redirect the fluid in some way away from its original direction of flow through the fluid distribution channel. For example, with reference to Figure 9, heated fluid from supply 410 may flow through fluid distribution channel 421 in a direction generally aligned with partition long axis 422, however, in passing through a fluid permeable sheet in the working face 424 of fluid dispensing outlet 420 the fluid may be at least somewhat directed to flow in a direction more strictly aligned with the normal axis 423 of working face 424 (e.g., as shown by the multiple arrows denoting the fluid flow in figure 9). This design can have advantages over causing the heated fluid to be impacted against substrate 110 in a direction closer to the direction normal to the substrate, as opposed to impacting against substrate 110 in a more tangential orientation. Similar considerations apply to the presence of a fluid permeable sheet on the working face 434 of the outlet 430. Internal baffles (not shown in the figures) may also be used within the fluid distribution channels 421 and/or 431 to direct the heated fluid in a desired direction.
[0081] In various embodiments, the fluid permeable sheet may comprise through openings that collectively provide the sheet with a percentage open area of at least about 20, at least about 30, or at least about 40. In additional embodiments, the fluid permeable sheet may comprise a percentage open area of at most about 90, at most about 80, or at most about 70. In specific embodiments, the fluid permeable sheet may comprise a perforated screen with through holes through a diameter of at least about 0.2 mm, at least about 0.4 mm, or at least about 0.6 mm. The fluid permeable sheet may comprise, for example, a perforated screen having through holes of a diameter of at most about 4 mm, at most about 2 mm, or at most about 1.4 mm. The through holes may be in the form of elongated slits, e.g. laterally elongated, as described below in Example 1. The combination of percentage open area and through hole size may be chosen to enhance uniform heating of the substrate. The screen can be composed of any material with sufficient durability and resistance to temperature for the uses presented here. For example, a metal screen might be suitable.
[0082] The heated fluid may exit the working face of the fluid dispensing outlet at any suitable linear velocity. The velocity can be affected and/or determined by the volumetric flow rate of the heated fluid supplied to the nozzle 400 by the supply line 410 (and supply line 411, if present), by the size of the fluid distribution outlets, by the percentage of open area and/or by the diameter of through holes in a fluid permeable sheet (if present) on the working face of the outlet, etc. As mentioned, in the case where partition 422 is present, during operation of apparatus 1 the linear velocity of the heated fluid leaving nozzle 400 through outlet 430 can be controlled independently of that exiting through outlet 420. The linear velocity will be, generally in the low subsonic range, eg less than Mach 0.5, typically less than Mach 0.2. Often the linear velocity will be in the range of a few meters per second; for example, less than 50, less than 25, or less than 15 meters per second. As such, the heated fluid collision apparatus and methods used here can be distinguished from the use of, for example, hot air knives, which generally rely on a linear velocity approaching or exceeding sonic velocity.
[0083] The area of the working faces 424 and 434 of the outputs 420 and 430, respectively, can be chosen so as to heat an area of the desired size, and can be chosen taking into account the characteristics of the substrates to be heated ( for example, its width, thickness, density, heat capacity, etc.). Often, outputs with working faces in the range of about 5 to 50 centimeters square can be used. The volumetric flow rate of the heated fluid, and the temperature of the heated fluid, can be chosen as desired. For melt bonding applications, the temperature of the heated fluid can be chosen to be at least equal to, or somewhat greater than, the softening point or melting point of a component of the substrates.
[0084] Any suitable heated gaseous fluid can be used, with ambient air being a convenient choice. However, dehumidified air, nitrogen, an inert gas, or a gas mixture chosen to have a specific effect (eg, promotion of binding capacity, hydrophobic capacity, etc.) can be used as desired. The fluid may be heated by an external heater (not shown in any figure) before being delivered to nozzle 400 via supply line 410 (and 411 if present). Additionally, or instead, heating elements may be provided within the nozzle 400; or additional heating (eg resistance heating, infrared heating, etc.) of the nozzle 400 may be applied.
[0085] Although heating the substrates and/or bonding the substrates as described in the present invention can be performed without any special handling of the fluid after it has been impacted against the substrates (as evidenced by Example Set 3), in certain In embodiments, it may be advantageous to provide local removal of the impacted fluid. Local removal means that fluid that has been impacted against the surface of a substrate through a nozzle is actively removed from the local vicinity of the fluid impact nozzle. This should be contrasted with processes in which the impacted fluid is passively allowed to escape from the nozzle's local surroundings, to be dissipated into the surrounding atmosphere, or removed by a device (eg, a cover, cover, duct, etc.) that is positioned there. a distance (eg, at least one decimeter) away from the fluid impact nozzle. Such local removal can be achieved through the use of a nozzle of the general type previously described in this document, which comprises a fluid distribution channel with an outlet for fluid distribution, with the addition of at least one fluid capture inlet that remains. positioned locally in relation to the fluid dispensing outlet. Locally positioned means that at its closest point of approach to each other, the fluid capture inlet is located less than 10 mm from the fluid dispensing outlet. In various embodiments, at its closest point of approach, the fluid capture inlet is located less than about 5 mm, or less than about 2 mm, from the fluid delivery outlet. The fluid capture inlet is in fluid communication with a fluid removal channel, through which fluid that has been captured by the fluid capture inlet can be actively removed (for example, by means of an exhaust line fluidly connected to the an external suction blower, not shown in any figure). The fluid capture inlet can locally remove a substantial volume percentage of the impacted fluid from the local vicinity of the nozzle before the impacted fluid is able to exit the local vicinity of the substrate and irreversibly disperse into the surrounding atmosphere so that it does not be more locally removable. In various embodiments, at least about 6%, at least about 80%, or substantially all of the volumetric flow of the impacted fluid is locally removed by the apparatus and methods described herein.
[0086] Nozzle 500 with a locally positioned fluid capture inlet is shown representatively in Figure 10a, which is a partial cross-sectional view along the machine direction of substrate 100 as it passes adjacent nozzle 500 (with substrate 100 moving direction being out of plane). For the sake of simplicity of description, Figure 10a shows only a single fluid dispensing channel 521, a single fluid dispensing outlet 520, and a single substrate 100 (in contact with the support surface 201, for example, of the support cylinder 200), however, it should be understood that when used to impact the heated fluid against two converging substrates in a manner similar to that described for nozzle 400, nozzle 500 will comprise two fluid distribution channels, two outlets for distributing fluid. fluids, etc., as will be discussed in more detail in relation to figure 11.
[0087] Although in the exemplary embodiment of Figure 10a, the fluid distribution outlet 520 and the fluid distribution channel 521 thereof, and the fluid capture inlets 540/540' and the fluid removal channels 541/541 'of these, are shown as a unit, with the common partitions 542 and 542' between them, it should be understood that the impact and fluid removal discussed herein can be accomplished through the use of two or more adjacent units, however, physically separated, at least one of which impacts the heated fluid through fluid delivery outlet 520 and at least one of these locally captures the impacted fluid through fluid capture inlet 540 or 540'. Therefore, although the term "nozzle" is used herein for the sake of discussion convenience, it is to be understood that the apparatus (eg, nozzle) described herein encompasses apparatus in which a single unit both impacts the fluid and captures the impacted fluid, as well as multi-unit apparatus in which one or more units impact fluid and one or more additional units (which may be physically separate units) capture the impacted fluid.
[0088] Similar to nozzle 400, nozzle 500 comprises a fluid dispensing outlet 520 comprising a working face 524 (which in this case comprises a perforated screen 525), the fluid dispensing outlet 520 is fluidly connected to fluid dispensing channel 521 (of which only the portion adjacent to fluid dispensing outlet 520 is shown in Figure 10a). Additionally, the nozzle 500 comprises fluid capture inlets 540 and 540', each of which is positioned locally relative to the fluid dispensing outlet 520. The fluid capture inlets 540 and 540' are fluidly connected to the fluid removal channels 541 and 541', respectively. In the example configuration shown, fluid capture inlets 540 and 540' flank laterally (i.e. they are located on either side, in a direction transverse to the direction of movement of substrate 100, for example, in a direction along the long axis of the support cylinder 200) the fluid distribution outlet 520. Similarly, the fluid removal channels 541 and 541' laterally flank the fluid distribution channel 521, being separated from it only by the (solid) partitions 542 and 542', respectively. Therefore, fluid removal channel 541 is defined on one side by partition 542, and on the other side by partition 543 (which, in this embodiment, comprises the outer compartment of the nozzle 500 in this area). Similarly, fluid removal channel 541’ is defined by partitions 542’ and 543’.
[0089] Again with reference to the simplified illustration of an outlet for dispensing and a substrate of Figure 10a, when active suction is applied to fluid removal channels 541 and 541' (e.g., through an external suction fan or blower ), a substantial volume percentage of the heated fluid exiting the working face 524 of the fluid dispensing outlet 520 and impacted against the first main surface 101 of the substrate 100 may be locally captured by the fluid capture inlets 540 and 540' and removed via fluid removal channels 541 and 541'. It has been found that such spot capture of impacted fluid can alter fluid flow patterns after, during, or possibly before it impacts against the surface 101 of substrate 100. For example, such spot capture can modify, reduce or substantially eliminate the fluid flow stagnation phenomena where the fluid impacts against the substrate in such a way that it drastically reduces or even stops fluid flow at certain locations. In changing flow patterns, local capture can advantageously modify (e.g., increase) the heat transfer coefficient between the impact fluid and the substrate at certain locations and/or can provide uniform heat transfer across a wider substrate area. As evidenced by Examples 1-2, local capture of impacted fluid can further allow heated fluid of lower, e.g. considerably lower, temperature to be used while still heating the substrates sufficiently to allow a bond, compared to the fluid temperature. impact required in the absence of such local capture. This local capture can also allow a faster linear speed of the substrates to be used.
[0090] The working faces 544 and 544' of the fluid capture inlets 540 can be approximately positioned even with the working face 524 of the fluid distribution outlet 520, such that the working faces 544, 544' and 524 are generally equidistant from surface 101 of substrate 100, as represented by distance 545 in Figure 10a (in the design of Figure 10a, working faces 544 and 544' of fluid capture inlets 540 and 540' comprise imaginary surfaces rather than fluid permeable screens). Nozzle 500 may be positioned such that working face 524 of fluid dispensing outlet 520, and working faces 544 and 544' of fluid capture inlets 540, are positioned within about 10, about 5, or about 2 mm, from the first major surface 101 of substrate 100. The terminal ends (closer to substrate 110) of partitions 542 and 543 may be generally equidistant from substrate 100, as shown in Figure 10a. Or, the terminal end of outwardly flanking partition 543 may be extended closer to substrate 110, which may improve the capture of fluid impacted by fluid capture inlet 540 (similar considerations apply to fluid capture inlet 540').
[0091] Figures 10a, 10b and 10c illustrate modalities in which the working faces 544 and 544' of the fluid capture inlets 540 and 540' are open and do not comprise a perforated screen or any other type of fluid permeable sheet. In these instances, the working face of a fluid capture inlet may be primarily defined by the terminal ends of the partitions. For example, the working face 544 may be defined at least in part by the terminal ends of the partitions 543 and 542, for example, in combination with the terminal ends of the laterally extending partitions not shown in Figure 10, such as the compartment 415 shown. in figure 9). However, in various embodiments, a fluid permeable sheet may be provided on the working face of one or more fluid capture inlets. Such a fluid permeable sheet may comprise similar properties (e.g. percentage open area etc.) to those of a fluid permeable sheet provided on the working face of the fluid distribution inlet to which the fluid capture outlet is locally positioned , and may be a continuation of the fluid permeable sheet of the fluid distribution inlet (for example, as shown in Example 1). In other embodiments, the fluid permeable sheet of the fluid capture inlet may have different properties, and/or be composed of different materials, than the fluid permeable sheet of the fluid distribution inlet.
[0092] Figure 10a illustrates an embodiment in which the configuration of the nozzle 500, the distance from the nozzle 500 to the substrate 100, the velocity of the used impact fluid, etc., combine to provide that substantially all of the exiting fluid through outlet 520 and impacts against substrate 100 is captured by inlets 540 and 540' before the impacted fluid is able to penetrate laterally beyond the boundaries of inlets 540 and 540' to any significant extent. This phenomenon is represented by the arrows denoting the direction of fluid flow in figure 10a. (Of course, some small portion of the fluid exiting outlet 520 may be removed through inlets 540 or 540' before impacting against substrate 100). Figure 10b illustrates an embodiment in which the nozzle 500 is operated such that some portion of the impacted fluid is able to penetrate laterally beyond the limits of inlets 540 and 540' (and therefore can locally mix with ambient air to at least a small extent), however, in which the suction provided by capture inlets 540 and 540' is strong enough so that substantially all of the impacted fluid is still captured by capture inlets 540 and 540'. Figure 10c illustrates an embodiment in which the nozzle 500 is operated such that substantially all of the impacted fluid is captured by the capture inlets 540 and 540', and in which some portion of the ambient air is also captured by the capture inlets (the ambient air flow in Figure 10c is indicated by the dashed arrows). When nozzle 500 is operated in this manner, in various embodiments, the volumetric flow rate of the captured ambient air can vary up to about 10%, up to about 20%, or up to about 40%, of the volumetric flow rate of the fluid impacted captured.
[0093] Those skilled in the art will appreciate that through the methods of the present invention, the impacted fluid can be circulated at least slightly laterally beyond the limits of the fluid capture inlets and still locally captured by the fluid capture inlets and removed . It has been found that adjusting the design of the nozzle 500 and the operating parameters of the system (eg, heated fluid flow rate, the suction applied through the fluid removal channels, etc.) can change the extent to which the fluid Impacted heated is capable of laterally penetrating beyond the limits of the fluid capture inlets before being captured by the capture inlets, and/or may alter the extent to which ambient air is captured in addition to the impacted fluid, any or both of which may advantageously improve the uniformity of heating experienced by substrate 100.
[0094] Examining figures 10a, 10b, and 10c, those skilled in the art can see that in these exemplary illustrations, the fluid distribution outlet 520 is only surrounded by the fluid capture inlets 540 and 540' laterally, not having provisions for the fluid capture inlets that surround the fluid distribution outlet 520 in the direction of movement of the substrate 100 for the purpose of completely surrounding the perimeter of the fluid distribution outlet 520. However, in a similar manner as discussed in connection with to nozzle 400, and as discussed below in relation to Figure 11, the inlets and outlets of the nozzle 500 may comprise circumferentially elongated arcuate shapes with the elongated axis of the inlets and outlets aligned in the direction of movement of substrate 100. Therefore, in various embodiments , provide fluid capture inlets 540 and 540' that laterally flank the fluid dispensing outlet 520 may sr sufficient to surround at least about 70%, at least about 80%, or at least about 90%, of the perimeter of the fluid delivery outlet 520 with the fluid capture inlets. Those skilled in the art will also appreciate that when using the nozzle 500 to connect two substrates as described in detail with reference to Figure 11, two fluid distribution outlets, each laterally flanked by fluid capture inlets, can be positioned in their circumferential end ends in close proximity, which, for the combined outlets, will further minimize the outlet area that is not surrounded by a fluid capture inlet).
[0095] Although Figures 10a, 10b, and 10c show only a single fluid capture inlet and a single substrate for the convenience of describing the basic premise of local fluid capture, it is understood that the nozzle 500 may be used to impact the heated fluid against two converging substrates and locally remove the impacted fluid from the local vicinity of the nozzle. This embodiment is illustrated illustratively in Figure 11. In the illustrated embodiment, the nozzle 500 comprises the first fluid dispensing outlet 520 with a working face 524, the outlet 520 being fluidly connected to the first fluid dispensing channel. fluids 521, and laterally flanked by first fluid capture inlets 540 and 540' which are fluidly connected to first fluid removal channels 541 and 541' (all as described in relation to Figure 10a).
[0096] The nozzle 500 further comprises a second fluid distribution outlet 550 with a working face 554, the outlet 550 being fluidly connected to the second fluid distribution channel 551, and laterally flanked by the second capture inlets of fluids 560 and 560' with working faces 564 and 564' respectively and which are fluidly connected to second fluid removal channels 561 and 561' respectively. All of these features are analogous to nozzle 400 in figure 9, with the addition of fluid capture inlets and fluid removal channels. As such, fluid distribution channels 521 and 551 can be considered to be substantially equivalent to fluid distribution channels 421 and 431 of nozzle 400, and fluid distribution outlets 520 and 550 can be considered to be substantially equivalent to outlets for fluid distribution 420 and 430 of the nozzle 400. Therefore, it is understood that the relevant descriptions of the features of the nozzle 400, for example, the circumferentially elongated and/or arcuate nature of the outlets, their positioning close to the substrate, the arrangement of the outlets for forming a protruding protrusion 535, etc., apply in the same way as the nozzle features 500. In particular, the fluid dispensing outlets 520 and 550 of the nozzle 500 are in a divergent relationship in the manner previously described. In particular embodiments, fluid capture inlets 540 and 540' may be congruent to fluid dispensing outlet 520, all of which may be congruent to adjacent surface 201 of support cylinder 200 (i.e., the arcuate shapes of all these elements can be similar and generally parallel to each other). Similar considerations apply for fluid capture inlets 560 and 560’, and fluid dispensing outlet 550, relative to each other and to surface 206 of support cylinder 205.
[0097] In Figure 11, only a heated fluid supply line (510) is shown, and the fluid distribution channels 521 and 551 are shown comprising portions of a single filled space without partitions (analogous to the partition 422 of the nozzle 400 ) between them. It is understood that such partition can be used if desired, and a heated fluid supply line may be used for a fluid distribution channel 551 that is separate from the heated fluid supply line used for the fluid distribution channel. 521 (in a manner similar to that described for nozzle 400).
[0098] At least one fluid exhaust line 511 is used to remove captured fluid from the nozzle fluid removal channels 500. In the illustrated embodiment, the fluid removal channels 541 and 561 comprise portions of a single removal channel of fluids, with no partitions between them. Therefore, in this embodiment, a single fluid exhaust line can be used to remove captured fluid from channels 541 and 561. If a partition is provided between fluid removal channels 541 and 561, separate fluid exhaust lines can be provided for each fluid removal channel. Similar considerations apply to channels 541’ and 561’.
[0099] If desired, separate fluid exhaust lines can be connected to fluid removal channels 541 and 541'. Alternatively, passages may be provided within the nozzle 500 (e.g., passing laterally through the fluid distribution channel 521), which interconnect the fluid removal channels 541 and 541', such that a single exhaust line of fluids can be used for both. Similar considerations apply to channels 561 and 561’.
[00100] Fluid dispensing outlet 520 can be used to impact heated fluid against main surface 101 of substrate 100 while substrate 100 is in contact with support surface 201 (e.g., support cylinder 200) . Similarly, fluid dispensing outlet 550 can be used to impact heated fluid against main surface 106 of substrate 105 while substrate 105 is in contact with support surface 206 (e.g., support cylinder 205). These operations can be conducted in a manner similar to that described for nozzle 400, except that fluid capture inlets 540, 540', and 560 and 560' are used as described above, in order to locally capture the impacted fluid .
[00101] In some cases, it may be desirable to provide multiple laterally spaced fluid distribution outlets, each fluidly connected to a fluid distribution channel. As described elsewhere herein, laterally means a direction transverse to the direction of movement of the substrate to be heated, for example along the long axis of a support roller. Figure 12 shows each exemplary configuration, again in the simplified context of a single substrate 100 with the direction of movement of the substrate being out of plane of Figure 12. Exemplary nozzle 600 comprises laterally spaced first and second fluid dispensing outlets. 620 and 620' with working faces 624 and 624', respectively, and fluidly connected to fluid distribution channels 621 and 621', respectively. In the illustrated embodiment, the working faces 624 and 624' comprise perforated screens 625 and 625', respectively. External fluid removal outlets 640 and 640’ are provided that flank the 620 and 620’ fluid distribution outlets laterally outward. An additional internal fluid capture inlet 670 is also provided which is laterally sandwiched between the fluid dispensing outlets 620 and 620'. Fluid capture inlets 640, 640', and 670 comprise working faces 644, 644', and 674, respectively, and are fluidly connected to fluid removal channels 641, 641' and 671 respectively. External fluid removal channels 641 and 641' are separated from fluid distribution channels 621 and 621' by partitions 642 and 642', respectively. External fluid removal channels 641 and 641' are further defined by partitions 643 and 643', respectively, which may comprise part of the nozzle housing 600 at these locations. Inner fluid removal channel 671 is separated from fluid distribution channels 621 and 621' by partitions 672 and 672', respectively.
[00102] The descriptions of the various fluid distribution and removal channels, fluid distribution outlets and fluid capture inlets provided above in relation to nozzles 400 and 500, are applicable to the various channels, outlets and inlets of nozzle 600. , of course, although shown (for convenience of description) in Figure 12 in relation to a single substrate 100, it should be understood that when used to impact heated fluid against the two converging substrates in a manner similar to that described for the nozzle 400 and for the nozzle 500, the nozzle 600 will comprise channels, outlets, inlets, etc., as needed to impact heated fluid against the two substrates. In particular, the nozzle 600 may comprise two laterally spaced pairs of fluid distribution outlets with each outlet of a given pair being in divergent relationship, and with the laterally spaced pairs of fluid distribution outlets being laterally flanked outwardly by pairs. of fluid capture inlets and having an additional pair of fluid capture inlets laterally sandwiched therebetween.
[00103] As illustrated in Figure 12, the heated fluid that exits the working faces 624 and 624' of the fluid distribution outlets 620 and 620' and impacts against the substrate 100 is locally captured by the fluid capture inlets 640, 640 ' and 670. Those skilled in the art will appreciate that interposing the internal fluid capture inlet 670 laterally between the fluid distribution outlets 620 can reduce or eliminate any stagnation points that might otherwise result from the collision. of the fluid from the two outlets. Designs of the type shown in Figure 12 can provide improved uniformity in heating wide-width substrates. Additionally, designs of this type may be advantageous in the case where it is desirable to heat two substrates in parallel strips (for example, to produce laminates of the type shown in figure 7). In this case, fluid dispensing outlet 620 may be generally centered on one strip of substrate, and fluid dispensing outlet 620' may be centered on the other.
[00104] The basic design of the nozzle 600, where multiple laterally spaced fluid distribution outlets are used, with the fluid capture inlets positioned laterally outward flanking the fluid distribution outlets, and a fluid capture inlet additional is positioned laterally between the fluid dispensing outlets, can be extended as desired. That is, a nozzle can be produced with any number of fluid dispensing outlets (on its long axis generally aligned in the direction of web movement), laterally interspersed in alternation with the fluid capture inlets. As mentioned above, multiple physically separate fluid dispensing outlets and fluid capture inlets can be provided, for a similar purpose. Any such design can allow wide-width substrates to be heated by the methods described herein.
[00105] Those of skill in the art will appreciate that while apparatus and methods for local removal of impacted fluid can be particularly advantageous for applications such as heating substrates to achieve a surface bond as described in the present invention, many other uses are possible. Examples Example 1
[00106] A continuous spinning non-woven mat was obtained from First Quality Nonwovens under the trade name Spunbond 50 gsm (SSS). The mat was 50 gsm with a 15% stitch binding stitch pattern and a width of 100 mm, and was composed of polypropylene. A substrate was obtained from the 3M Company, St. Paul, MN, USA under the trade designation CS600 (of the general type described in US patent 6000106). A first surface of the substrate was generally smooth and the second surface of the substrate had bulges at a density of approximately 2300 per square inch, (the bulges being male fasteners with a generally enlarged disk-shaped head). The substrate thickness was approximately 100 microns (not counting the height of the bulges) and the height of the bulges was approximately 380 microns. The support and protuberances are integrally constructed and both composed of polypropylene/polyethylene copolymer. The substrate was obtained as elongated strips each being 24 mm wide.
[00107] A mat handling apparatus with a laminating nip was set up in a manner similar to that shown in figure 8. Two elongated strip substrates were bonded to the first surface of a single non-woven mat as described in the present invention . While for convenience the description below has occasionally been formulated in terms of one substrate, it is understood that two identical substrates were handled identically, moving in parallel.
[00108] In using the apparatus, the substrate was oriented over a 10.2 cm radius chrome preheat cylinder (analogous to cylinder 210 of figure 8) with a first surface of the substrate (i.e., the opposite surface the surface supporting the protrusions) in contact with the surface of the preheat cylinder. The preheat cylinder was internally heated by hot oil to comprise a nominal surface temperature of approximately 118 degrees C. Upon obtaining steady-state operating conditions, it was found that a first surface of the substrate reached a temperature of approximately 113 degrees C (as monitored by a non-contact thermal measurement device).
[00109] From the preheat cylinder, the substrate traveled a distance of approximately 5.1 cm to a first support cylinder (analogous to cylinder 220 in figure 8) with a radius of 3.2 cm, which was not actively cooled or heated. On its surface, the cylinder comprised a surface layer with a nominal thickness of 0.64 cm of silicone rubber impregnated with aluminum particles. The surface layer comprised a Shore A hardness of 60. The surface layer comprised two raised plateaus extending completely circumferentially around the cylinder (the plateaus were raised approximately 2.2 mm above the surrounding surface of the cylinder), each one with a width of approximately 27 mm, with the lateral distance (along the face of the cylinder, in a direction aligned with the long axis of the cylinder) between its edges close to approximately 8 mm. The parallel displacement substrates were oriented on the plateaus of the first support cylinder such that the mushroom-shaped heads of the protrusions on the second surface of the substrate contacted the plateau surface. (Substrates were raised over the plateaus to minimize the chances of the non-woven mat coming in contact with the surface of the first support roll.) After the surface of the first support roll surface, the substrates circumferentially traversed an arc of approximately 180 degrees around the first support cylinder to be heated and connected as described in the present invention.
[00110] When using the device, the non-woven mat was oriented over a second support cylinder, with a radius of 10.2 cm (similar to cylinder 230 in figure 8). The second support cylinder comprised a metal surface and was controlled by internal fluid circulation at a nominal temperature of 38 degrees C. The non-woven mat circumferentially ran an arc of approximately 90 degrees around the second support cylinder to be heated and bound as described in the present invention. The trajectory of the non-woven web was aligned with the trajectories of the two substrate strips in such a way that when the two substrates came into contact with the non-woven web at the contact line between the two supporting cylinders, the substrate strips lined up with the non-woven blanket.
[00111] The support cylinders were positioned in a horizontal pile, similar to the arrangement shown in figure 8. A hot air stream impact nozzle capable of locally capturing/removing the impacted air was constructed and placed vertically above the pile. of support cylinder, adjacent to the contact line, in a manner analogous to the placement of the nozzle 400 in figure 8. As seen from the side along an axis transverse to the movement of the mat (i.e., as seen in figure 8), the nozzle comprised a first surface and a second surface, the first and second surfaces being in a divergent relationship (as defined above). Each surface comprised a generally cylindrical section, with the curvature of the first surface generally compatible with the curvature of the first support cylinder (with the radius of curvature of the first surface being approximately 3.2 cm) and the curvature of the second surface generally compatible with the curvature of the second support cylinder (with the radius of curvature of the second surface being approximately equal to 10.2 cm). The circumferential length of the first surface was approximately 75 mm and the circumferential length of the second surface was approximately 50 mm. The two surfaces meet on a protruding protrusion analogous to protrusion 435 in figure 9.
[00112] As observed from an aligned direction of movement of the two strips of substrate, the first divergent surface of the nozzle comprised two air distribution outlets, each having a lateral width of approximately 25 mm. The two air distribution outlets were laterally outwardly flanked by the two air capture inlets, having a lateral width of approximately 21 mm. Sandwiched laterally between the two air distribution outlets was an additional air capture inlet, having a lateral width of approximately 4mm. A perforated metal screen comprising elongated slit openings has been positioned to extend transversely across the first divergent surface for the purpose of lining the two air distribution outlets and the air capture inlet between them, however, not lining the two air-capture inlets that flank out to the side. The slit openings were elongated in the lateral direction, were approximately 0.9 mm wide, and were circumferentially spaced at a center-to-center spacing of approximately 3.0 mm. The perforated metal screen comprised an open area percentage of approximately 28%. Therefore, the first surface of the mouthpiece comprised a configuration analogous to that shown in Figure 12, except that the perforated metal screen defined the sandwiched air capture inlet in addition to defining the working surfaces of the air distribution outlets.
[00113] When viewed from a direction aligned with the movement of the non-woven mat, the second divergent surface of the nozzle comprised a similar arrangement of two air distribution outlets, two laterally flanking air capture inlets, and a laterally sandwiched air capture inlet. The lateral widths of the exits and entrances were the same as those of the first diverging surface. The second divergent surface comprised an adjustable shutter that extended laterally so as to laterally coat the width of both the air distribution outlets and those that can be moved circumferentially along the second surface for the purpose of controlling the circumferential length of the distribution outlets of air. The obturator was positioned such that the circumferential length of the second divergent surface air distribution outlets was approximately 40 mm. The perforated metal screen described above lined the two air distribution outlets and the air capture inlet therebetween of the second divergent surface, in a similar manner to the first divergent surface.
[00114] All the air distribution outlets and inlets of the first and second diverging surfaces were fluidly connected to the air distribution channels and the air removal channels, respectively. The air distribution outlets were all fed by the same air distribution conduit attached to the nozzle, such that the substrates, and the non-woven mat, received air at generally similar temperatures. The temperature and volumetric flow rate of the heated air supplied to the nozzle could be controlled as desired (using a heater available from Leister, of Kaegiswil, Switzerland, under the trade designation Lufterhitzer 5000). The volumetric rate of removal of trapped air (via a removal conduit attached to the nozzle) could be controlled as desired.
[00115] The nozzle was positioned close to the first and second support cylinders in a manner analogous to the position of the nozzle 400 in figure 9. The first divergent surface of the nozzle was at a distance estimated to be approximately 1.5 to 2 mm from the surface of the first support cylinder, along an arc extending approximately 128 degrees circumferentially around the first support cylinder. The second divergent surface of the nozzle was at a distance estimated to be approximately 1.5 to 2 mm from the surface of the second support cylinder, along an arc extending approximately 28 degrees circumferentially around the second support cylinder. The protruding protrusion was centered over the contact line (the closest point of contact between the surfaces of the two cylinders), again analogous to the configuration shown in figure 9.
[00116] The heated air supply temperature was measured at 19°C (39°F) through the use of various thermocouples and associated physical components. The volumetric flow rate of the heated air and captured air was determined using a hot wire anemometer and associated physical components. The volumetric flow of heated air was approximately 1.0 cubic meter per minute. With the total area of the air distribution outlets being approximately equal to 54 cm2, and with the perforated metal screen comprising an open area percentage of approximately 28, the linear velocity of the heated air on the working face of the outlets was estimated to be approximately equal to 11 meters per second. The return supply volume was approximately 1.14 cubic meters per minute, therefore corresponding to the capture of ambient air at a volumetric flow rate of approximately 14% of that of the impacted captured air.
[00117] The apparatus and methods described above were used to guide the elongated strip substrates and the non-woven web in an arcuate path along the surface of the first and second support rollers respectively, during which they passed closely through the first and second divergent surfaces (respectively) of the nozzle, to be impacted with heated air with local capture of impacted air. Then, the substrates and the non-woven mat entered the contact line between the two support rollers where the first substrate surfaces and a first support surface were brought into contact. The line of contact between the two support cylinders has been set to a low pressure, the pressure being estimated to be 5 pli (pounds per linear inch), or approximately 9 N per linear centimeter. The linear velocity of the two substrates and the non-woven mat was adjusted to a nominal 70 meters per minute.
[00118] After being placed in contact with each other, the substrates and the non-woven mat circumferentially followed the surface of the second support roller along an arc of approximately 180 degrees before being removed from contact with the support roller.
[00119] This process resulted in the bonding of two parallel strips of substrate to the first surface of the non-woven mat, with a strip of the first surface of the non-woven mat being exposed between the edges near the substrate strips, and with the strips of the first surface of the non-woven mat exposed beyond the far edges of the strips (analogous to the arrangement shown in figure 7).
[00120] Upon inspection, it was found that bonding between the substrate strips and the non-woven mat was excellent, and that it was difficult or impossible to remove the substrate from the non-woven mat without significantly damaging or destroying one or both. Notably, the bonded area extended completely across the contact area between the substrate and the non-woven mat, including the edges of the substrate. It was also noted that the second surface of the non-woven mat (the surface opposite the surface to which the substrate was bonded) in areas where the substrate was bonded was not significantly different from areas without the substrate. That is, it did not appear that the bonding process significantly altered the thickness, density, or appearance of the non-woven mat. It was also noted that the bonding process did not appear to affect or alter the protruding male fasteners. That is, no physical damage or deformation of the elements was observed. Qualitatively, no difference was observed in the thickness of the fibrous mat as a result of having been subjected to the bonding process. Qualitatively, no differences were observed in the engagement performance of the fasteners to the fibrous materials as a result of having been subjected to the bonding process. Upon close inspection, it was observed that the non-woven mat and substrate were surface bonded to each other as described in the present invention. Example 2
[00121] A composite non-woven mat was obtained from 3M under the trade name EBL Bright (of the general type described in US patent 5616394), which comprised approximately 35 gsm of polylene fiber (4 denier) bonded in arcuately protruding loops to a 35 gsm polypropylene support. The strips of substrate material from Example 1 were bonded to the fiber side of the non-woven mat, using substantially the same conditions as for Example 1. Again, excellent results were obtained, with excellent surface bonding along. of the entire contact area between the non-woven mat and the substrate, and with no apparent damage or densification of the non-woven mat and no apparent damage or deformation to the male fasteners. Example Set 3
[00122] A continuous spinning non-woven mat - produced by extrusion into blocks with hot air flow at high speed (meltblown) - 50 gsm continuous spinning (SMS) was obtained from PGI Nonwovens, Charlotte, NC, USA , under the tradename LC060ARWM. Various widths of blanket were used, usually in the 10 cm range. A substrate was obtained from the 3M Company, St. Paul, MN, USA as described in Example 1. The substrate was obtained as an elongated strip 20 mm wide.
[00123] A mat handling apparatus with a rolling contact line has been established. The apparatus had a first support cylinder produced from metal and a second support cylinder produced from wood, with the surface of the wooden cylinder coated with a silicone tape (obtained from Tesa, Hamburg Germany, under the name commercial 04863). The support cylinders were placed in a vertical stack with the wooden cylinder on top of the metal cylinder, defining a line of contact between them. The temperature of the support cylinders was not controlled. The non-woven mat was oriented over the first metal support roll and the substrate was oriented over the second silicone coated wooden support roll, with the protrusions facing the support roll. Auxiliary rollers were placed next to the support rollers to orient the substrate and nonwoven web such that each traversed an arc of approximately 130 degrees around its respective support roller.
[00124] The heated air was supplied by a heater available from Leister, of Kaegiswil, Switzerland, under the trade designation LHS System 60 L. The heated air was impacted against the substrates through a custom nozzle. The mouthpiece was manufactured from metal and had a feed inlet (opening system) at the rear of the mouthpiece that could be coupled to a heated air supply duct. The nozzle body was produced from two laterally spaced and generally parallel side walls that extended horizontally along the long axis of the nozzle from the feed inlet at the rear of the nozzle to a tip at the front of the nozzle (closest to the tip). The side walls were substantially identical in shape; each having upper and lower edges with a defined sidewall height therebetween at any given location along the long axis of the mouthpiece. Along the distance from the rear of the nozzle to a location approximately halfway between the front and the rear of the nozzle, the top and bottom edges of each sidewall diverged such that the sidewall height was increased to a maximum level. Over the distance from this location (maximum sidewall height) to the front of the nozzle, the sidewall height decreased as the top and bottom edges of the sidewalls followed a smoothly arcing converging trajectory to meet at a point that defined the front of the mouthpiece. The arcuate shape of the upper and lower edges of the side walls is made to generally conform to the curvature of the wooden support cylinder and the metal support cylinder, respectively. Therefore, the mouthpiece comprised an upper anterior face and a lower anterior face, the faces in a divergent relationship with the front end of the mouthpiece comprising a protruding protrusion.
[00125] On the upper and lower anterior faces of the mouthpiece, the lateral spacing between the side walls was approximately 20 mm. The interior of the nozzle was divided by metal partitions to provide six rectangular air distribution outlets each provided by an air distribution channel (with all channels being supplied with heated air from the same supply inlet in the part. rear of the nozzle). Each air distribution outlet was approximately 20mm in lateral width, with the vertical height of the outlets ranging from approximately 2.5mm to 4.0mm (since the nozzle was customised, there was some variability in dimensions). One of the air distribution outlets was the protruding tip on the front of the mouthpiece, and was oriented to distribute the heated air generally directly towards the line of contact established by the two support cylinders. The top face of the nozzle had three air distribution vents, oriented to distribute heated air to the substrate as it traversed an approximately 45 degree arc around the upper support cylinder just before passing through the contact line. The underside of the nozzle had two air distribution vents, oriented to distribute the heated air over the non-woven mat as it traversed an approximately 45 degree arc around the lower support cylinder just before passing through. from the contact line. The air distribution vents were opened without any perforated metal screens being present. Between the air distribution channels inside the mouthpiece there were dead spaces (through which the heated air did not pass). Holes were provided in the side walls of the mouthpiece in these dead space locations to provide ventilation. The nozzle contained no air capture inlet and no provision was made for local removal of impacted air.
[00126] In several experiments using the device, the mouthpiece was positioned in such a way that the air distribution outlets from the top face of the mouthpiece were estimated to be in the range 3-4 mm from the face of the top support cylinder , and such that the air distribution outlets from the lower face of the mouthpiece were similarly estimated at 3-4 mm from the face of the lower support cylinder. In these experiments, heated air was provided at various volumetric flow rates. It was not possible to measure actual volumetric flow rates during the experiments, however, offline testing indicated that volumetric flow rates were in the range of several hundred liters per minute. In these experiments, heated air was provided at various temperatures, ranging from approximately 500 degrees C to approximately 700 degrees C. In these experiments, the substrate and the non-woven mat were oriented over their respective support cylinders, passed in front of the nozzle, and placed in contact with each other, at various linear speeds over the range of 105-210 meters per minute. Under these general conditions, the non-woven mat and substrate were able to be bonded together to provide a surface bonded laminate as described in the present invention, without apparent damage or densification of the non-woven mat and without apparent damage. or deformation to the male fasteners. Under these general conditions, it was found that, with the combination of substrates and nozzle used in these experiments, a more robust bond was obtained at higher temperatures and/or at lower linear velocities. However, the degree of bonding that is suitable may vary with the particular application for which the laminate is to be used.
[00127] The tests and test results described above are intended to be illustrative only, not predictive, and it can be expected that variations in the test procedures will produce different results. All quantitative values in the Examples section are understood to be approximate in view of the commonly known tolerances involved in the procedures used. The detailed description and examples given above are provided for clarity only. No unnecessary limitations should be inferred from them.
[00128] It will be evident to those skilled in the art that the exemplary structures, features, specific details and configurations, among others, that are presented in the present invention can be modified and/or combined in numerous modalities. All these variations and combinations are contemplated by the inventor as being within the scope of the conceived invention. Therefore, the scope of the present invention is not to be limited to the specific illustrative structures described herein, but rather by the structures described by the language of the claims, and the equivalents of those structures. To the extent that there is a conflict or discrepancy between this descriptive report and the presentation in any document incorporated by reference herein, this descriptive report shall have authority. This application refers to provisional patent application US Serial No. xx/xxx.xxx entitled APPARATUS AND METHODS FOR IMPINGING FLUIDS ON SUBSTRATES, Precedent No. 66031US002, filed on the same date hereof, which is incorporated herein by reference , in its entirety.

权利要求:
Claims (11)
[0001]
1. Surface bonded laminate (150), CHARACTERIZED in that it comprises: a fibrous batt (110) comprising fibers (111) and having first and second opposing main surfaces (112, 113); and, a substrate (120) with opposite first and second main surfaces (121,122); wherein some fibers (111) of the first main surface (112) of the fibrous batt (110) are surface bonded to the first main surface (121) of the substrate (120), wherein fibers (111) are surface bonded to the first surface main (121) of the substrate (120) means that portions of fiber surfaces (115) of fiber (114) portions of fibers (111) are fusion bonded to the first main surface (121) of the substrate (120), so to substantially preserve the original prebonded shape of the main surface (121) of the substrate (120), and to substantially preserve at least some portions of the first main surface (121) of the substrate (120) in an exposed condition, in the area bound by surface.
[0002]
2. Laminate, according to claim 1, CHARACTERIZED by the fact that the fibrous mat (110) is a non-woven fibrous mat.
[0003]
3. Laminate, according to claim 1, CHARACTERIZED by the fact that the substrate (120) comprises protrusions (123) on the second main surface (122) of the substrate (120) in areas connected by surface of the substrate.
[0004]
4. Laminate, according to claim 1, CHARACTERIZED by the fact that the fibrous batt (110) and the substrate (120) comprise an overlapping area in which the first main surface (112) of the fibrous batt (110) and the first The main surface (121) of the substrate (120) are in an overlapping relationship with each other, and wherein the fibrous batt (110) and the substrate (120) are surface bonded to each other over at least 70% of the overlapping area.
[0005]
5. Laminate, according to claim 4, CHARACTERIZED by the fact that the fibrous mat (110) and the substrate (120) are surface-bonded to each other substantially throughout the overlapping area.
[0006]
6. Laminate, according to claim 5, CHARACTERIZED by the fact that the fibrous mat (110) comprises at least a first extended portion that is not in an overlapping relationship with the substrate (120).
[0007]
7. Laminate, according to claim 1, CHARACTERIZED by the fact that the surface bonding of the first main surface (112) of the fibrous mat (110) to the first main surface (121) of the substrate (120) does not provide continuous connections in that the fibers immediately adjacent to the first main surface (121) of the substrate (120) form a continuous layer of material above and in contact with the main surface (121) of the substrate (120).
[0008]
8. Laminate, according to claim 1, CHARACTERIZED by the fact that the fibers (111) of the first main surface (112) of the mat (110) that are surface-bonded to the first main surface (121) of the substrate (120) they are not ultrasound bound fibers or compression bound fibers.
[0009]
9. A method of attaching at least one fibrous batt (110) to at least one substrate (120), CHARACTERIZED in that it comprises: impacting the heated fluid against a first main surface (112) of a moving fibrous batt (110 ); impacting the heated fluid against a first main surface (121) of a moving substrate (120); and, placing the first main surface (112) of the fibrous batt (110) in contact with the first main surface (121) of the substrate (120) such that the first main surface (112) of the fibrous batt (110) is bonded. by fusion to the first main surface (121) of the substrate (120), wherein the fusion bonding of the first main surface (112) of the fibrous batt (110) to the first main surface (121) of the substrate (120) is surface bonded of some fibers (111) from the first main surface (112) of the fibrous batt (110) to the first main surface (121) of the substrate (120), wherein the fibers (111) being surface bonded to the first main surface (121) of the substrate (120) means that portions of fiber surfaces (115) of fiber portions (114) of fibers (111) are fusion bonded to the first main surface (121) of the substrate (120), so that they substantially preserve the original pre-bonded shape of the first main surface. pal (121) of the substrate (120), and to substantially preserve at least some portions of the first main surface (121) of the substrate (120) in an exposed condition, in the surface bonded area.
[0010]
10. The method according to claim 9, CHARACTERIZED in that the fibrous mat (110) comprises an opposing second main surface (113) that is in contact with a first support surface during the impact of the heated fluid against the the first main surface (112) of the fibrous batt (110), and the substrate (120) comprising an opposite second main surface (122) which is in contact with a second support surface during the impact of heated fluid against the first. main surface (121) of the substrate (120).
[0011]
11. Method according to claim 9, CHARACTERIZED by the fact that the heated fluid that is impacted against the first main surface of the fibrous batt does not pass through the thickness of the fibrous batt in order to exit the second main surface of the fibrous batt .

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US20180229490A1|2018-08-16|

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MY161587A|2017-04-28|

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MX2012007297A|2012-07-04|

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JP2013514917A|2013-05-02|

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TW201144060A|2011-12-16|

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JP2016130021A|2016-07-21|

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IL220518A|2017-08-31|

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EP2516150A4|2013-07-17|

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PL2516150T3|2017-01-31|

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法律状态:
2020-12-08| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|

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2020-12-22| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|

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2021-04-06| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|

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2021-04-20| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 10 (DEZ) ANOS CONTADOS A PARTIR DE 20/04/2021, 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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US28895209P| true| 2009-12-22|2009-12-22|

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US61/288,952|2009-12-22|

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PCT/US2010/061253|WO2011087752A2|2009-12-22|2010-12-20|Bonded substrates and methods for bonding substrates|

---