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    • 专利摘要:
    abstract the present invention provides paper products containing an increase in the cd stretch, which can be manufactured using a process in which the weave being produced is subjected to two separate running transfers. the first run transfer occurs when the weave is transferred from the forming fabric to the transfer fabric, that is, the "first position", and the second occurs when the weave is transferred from the transfer fabric to the pass-through fabric of air (tad), that is, the "second position". the general speed differential between the forming fabric and the tad fabric can be, for example, from about 10 to about 50%, with the amount of run transfer being divided between the first and second position in a sufficient way to obtaining the desired cd stretch and other sheet properties.
    公开号:BR112014006039B1
    申请号:R112014006039-8
    申请日:2012-08-09
    公开日:2021-03-30
    发明作者:Michael Alan Hermans；Samuel August Nelson；Mark William Sachs
    申请人:Kimberly-Clark Worldwide, Inc；
    IPC主号:
    专利说明:

    BACKGROUND OF THE INVENTION
    [1] In the field of paper products, such as facial tissue paper, bath tissue paper, table napkins, paper towels and the like, stretching in the transverse machine direction (CD) of a sheet of paper is a feature or property important. Since tissue paper products tend to fail in the transversal direction of the machine, an increase in the CD stretch will generally increase the durability and resistance of the tissue paper product to a given tensile strength. Similarly, increasing the CD stretch can also improve the tactile feel of the tissue paper product in use. An improved CD stretch can also improve the manufacturing efficiency of tissue paper products, particularly the efficiency of conversion operations, which would benefit from increases in strength and durability. Consequently, it may be desirable to increase the amount of CD stretch beyond that obtained by conventional methods and found in conventional sheets. For example, a creped paper can have a CD stretch of about 4 to about 5%. These CD stretch levels have been increased on non-creped papers with air passage, such as those disclosed in U.S. Patent No. 6,017,417, 7,156,953 and 7,294,229, to up to about 10%. Although these products have increased CD stretch, there remains a need for base sheets for tissue paper products containing higher degrees of CD stretch, while maintaining other important sheet properties.
    [2] In addition, many methods of increasing stretch tend to decrease tensile strength. For example, creping is often used to increase the stretch towards the machine, but creping tends to decrease the weft resistance. Similarly, shortening the weft in the transverse direction (CD) can reduce the tensile strength in the transverse direction (CD). Since both traction and stretching are important for the durability of the weave, it is desired to have both a high traction in the transverse direction (CD) and a high stretch in the transverse direction (CD) simultaneously to maximize the durability of the weave in the transverse direction (CD) . Although the traction in the machine direction (MD) and the traction in the transverse direction (CD) can be increased by refinement or reinforcing agents, it is not desirable to significantly increase the tensile strength in the machine direction (MD), as this reduces it excessively the smoothness of the plot. As such, there remains a need for base sheets of tissue paper products containing higher degrees of CD stretch and CD traction while maintaining other important sheet properties. SUMMARY
    [3] Recently, it was discovered with surprise that the levels of stretching in the direction of the machine (CD) can be increased by making a sheet of tissue paper using a process in which the fabric being produced is subjected to two distinct race transfers. The term "race transfer" generally refers to the process of holding the fabric being produced at different speeds, as it is transferred from one fabric in the papermaking process to another fabric. The present disclosure provides a process in which the fabric being fabricated is subjected to two distinct race transfers, the first occurring when the fabric is transferred from the forming fabric to the transfer fabric, that is, the "first position" and the second occurring when the weft is transferred from the transfer fabric to the fabric with drying by air passage (TAD), in other words, the "second position". The overall speed differential between the forming fabric and the TAD fabric can be, for example, from about 10 to about 50%, with the amount of run transfer being divided between the first and the second position sufficiently to obtain the desired CD stretch and other sheet properties.
    [4] Consequently, in certain applications, the present disclosure offers an improvement in papermaking methods and products, providing a tissue paper sheet and a method for obtaining a tissue paper sheet, with a better CD stretch. Thus, as an example, the present disclosure provides a sheet of tissue paper having a CD stretch greater than about 15% and a CD tensile strength greater than about 750 grams by 3 inches (76.2 mm).
    [5] The increase in CD stretch improves the tactile feel of the tissue paper product, while reducing the tendency to tear a sheet in the direction of the machine (MD) in use.
    [6] In another aspect, the present disclosure provides a method of fabricating a tissue paper sheet comprising the steps of: (a) depositing an aqueous suspension of papermaking fibers on a forming fabric moving at a first rate speed to form a wet web; (b) dehydrating the web to a consistency of about 20% or greater; (c) transferring the dehydrated web to a transfer fabric by running, the transfer fabric moving at a rate of speed of about 1 to about 30% less than the speed of the forming fabric; (d) transferring the weave to a fabric with forced drying, the fabric with forced drying moving at a speed rate of about 1 to about 30% less than the speed of the transfer fabric; and (e) forced drying of the web.
    [7] In still other aspects, the present disclosure provides a method of fabricating a tissue paper sheet with high cross-sectional stretch and high tension, the method comprising the steps of: (a) depositing an aqueous suspension of manufacturing fibers of paper on a forming fabric moving at a first rate of speed to form a wet web; (b) dehydrating the weft to a consistency of about 20% or greater; (c) transferring the dehydrated web to a transfer fabric by running, the transfer fabric moving at a rate of speed of about 1 to about 30% less than the speed of the forming fabric; (d) transferring the weave to a fabric with forced drying, the fabric with forced drying moving at a speed rate of about 1 to about 30% less than the speed of the transfer fabric; and (e) forced drying of the web to form a tissue paper sheet, the tissue paper sheet having a CD stretch percentage greater than about 15% and a CD tensile strength greater than about 800 grams by 3 inches (76 , 2 mm). DESCRIPTION OF THE DRAWINGS
    [8] FIGURE 1 illustrates a method of manufacturing a paper product in accordance with the present disclosure; FIGURE 2 illustrates the percentage of stretching in the transverse direction (vertical axis) in relation to the percentage of transfer per run at the second location (horizontal axis) for various tissue paper products prepared in accordance with the present disclosure; FIGURE 3 illustrates the percentage of stretching in the transverse direction (vertical axis) in relation to the percentage of transfer per run at the second location (horizontal axis) for various tissue paper products prepared in accordance with the present disclosure; FIGURE 4 illustrates the percentage of stretching in the transverse direction (vertical axis) in relation to the percentage of transfer per run at the second location (horizontal axis) for various tissue paper products prepared in accordance with the present disclosure; FIGURE 5 illustrates the percentage of stretching in the transverse direction (vertical axis) in relation to the percentage of transfer per run at the second location (horizontal axis) for various tissue paper products prepared in accordance with the present disclosure; FIGURE 6 illustrates TEA in the transverse direction (gf * cm / cm2) (vertical axis) as a function of the percentage of run transfer in the second location (horizontal axis) for various tissue paper products prepared in accordance with the present disclosure, and FIGURE 7 illustrates the TEA CD (gf * cm / cm2) (vertical axis) as a function of the percentage of transfer per run at the second location (horizontal axis) for various tissue paper products prepared in accordance with the present disclosure. DEFINITIONS
    [9] As used herein, the term "tissue paper product" refers to products made from basic wefts comprising fibers and includes, bath tissue paper, facial tissue paper, paper towels, industrial cleaners, hair cleaners food services, napkins, medical protections / supports, and other similar products.
    [10] As used herein, the terms "tissue paper weave" or "tissue paper sheet" refer to a cellulosic weave suitable for making or using as a facial tissue paper, bath tissue paper, paper towels, napkins or similar. It can be layered or non-layered, creped or non-creped, and can consist of a single layer or multiple layers. The aforementioned tissue paper wefts are preferably manufactured from sources of natural cellulosic fibers, such as short fibers, long fibers, and non-woody species, but can also contain significant amounts of recycled fibers, sized or chemically modified fibers, or synthetic fibers. .
    [11] As used herein, the term "Roll Volume," refers to the volume of paper divided by its mass in the wound roll. The volume of the roll is calculated by multiplying pi (3,142) by the amount obtained by calculating the difference between the diameter of the roll squared in cm squared (cm2) and the outside diameter of the core squared in cm squared (cm2) divided by 4, divided by the length of the leaf in centimeters multiplied by the leaf count multiplied by the dry basis weight of the leaf in grams (g) per square centimeter (cm2).
    [12] As used herein, the "geometric mean tensile strength (GMT)," refers to the square root of the product of the machine's tensile strength in the machine direction by the machine's tensile strength in the transversal direction of the machine . As used herein, tensile strength refers to the average tensile strength as would be evident to a person skilled in the art. Geometric values of tensile strength are measured using "MTS Synergy" stress test equipment using a 3-inch (76.2 mm) sample width, a 2-inch (50.8 mm) clamp opening, and a crosshead speed of 10 inches (254 mm) per minute, after holding the sample in TAPPI conditions for 4 hours before testing. A 50 Newtons limit load cell is used in the tensile test equipment.
    [13] As used herein, the term "Kershaw Test", refers to the firmness of the roll, as determined using the Kershaw Test as described in detail in U.S. Patent No. 6,077,590 by Archer, which is incorporated by reference. The device is available from Kershaw Instrumentation, Inc. (Swedesboro, NJ), and is known as a Roller Density Test Equipment, model RDT-2002.
    [14] As used herein, the term "stretch CD," refers to the maximum tensile stress developed in a weft or tissue paper product, in the transversal direction of the machine, before rupture in a tensile test carried out in accordance with with the TAPPI - T576 test method. The stretch is expressed as a percentage, that is, one hundred times the reason for the increase in the length of the weft or tissue product in relation to the original test length. DETAILED DESCRIPTION
    [15] Subjecting a weave being produced at a speed differential as it is passed from one fabric in the papermaking process to another fabric is known in the art and commonly referred to as race transfer. Running transfer is typically used to provide the machine-directed (MD) stretch in the web, and is normally performed when the web is transferred from the forming fabric to the transfer fabric. Speed differentials between the forming tissue and the transfer tissue of about 20 to about 30% are typical, and the resulting tissue paper generally has an MD stretch similar to the run transfer speed differential, expressed as a percentage, i.e. that is, an MD stretch of about 20 to about 30%. The amount of stretch in the machine's cross direction (CD), however, is significantly less, only about 5 to about 10%, and in general it does not increase with increasing amounts of run transfer. However, it has now been found that the CD stretch can be increased without adversely affecting other sheet properties by providing a second run transfer as the weft is transferred from the transfer fabric to the TAD fabric. By dividing the run transfer between two different positions, it was found that not only can an MD stretch be added to the sheet, but also the CD stretch can be increased.
    [16] Suitable papermaking processes useful for making tissue paper sheets according to the present invention include non-creped forced drying processes which are well known in the towel and tissue paper manufacturing art. Such processes are described in U.S. Patent Nos. 5,607,551, 5,672,248, and 5,593,545, all of which are incorporated herein by reference, in a manner consistent with the present disclosure.
    [17] With reference to FIGURE 1, a process for obtaining using the present invention will be described in more detail. The process shown illustrates a drying process, but it will be recognized that any known papermaking method or tissue papermaking method can be used in conjunction with the nonwoven fabricmaking fabric of the present invention. Related non-creped dry tissue processes are described for example in U.S. Patent Nos. 5,656,132 and 6,017,417, both of which are incorporated herein by reference, in a manner consistent with the present disclosure.
    [18] In FIGURE 1, a double-strand former having a papermaking inlet box 10 injects or deposits a mixture of an aqueous suspension of papermaking fibers onto a plurality of forming fabrics, such as woven fabric. external forming 5 and internal forming fabric 3, thus forming a wet web of tissue paper 6. The forming process of the present invention can be any conventional forming process known in the papermaking industry. Such forming processes include, but are not limited to, Fourdrinier machines, cover former, such as suction roll former, and gap former, such as double wire former and crescent former.
    [19] The wet tissue paper 6 forms on the inner fabric 3 as the inner fabric 3 rotates around a forming roll 4. The inner fabric 3 serves to support and transport the web of newly formed wet tissue paper 6 downstream in the process according to the wet tissue paper web 6 is partially dehydrated to a consistency of about 10% based on the dry weight of the fibers. Additional dehydration of the wet tissue paper 6 can be accomplished by known papermaking techniques, such as vacuum suction boxes, while the inner forming fabric 3 supports the wet tissue paper 6. The wet tissue web. 6 can be further dehydrated to a consistency of at least about 20%, more specifically between about 20 to about 40%, and more specifically about 20 to about 30%.
    [20] Forming fabric 3 can generally be made of any suitable porous material, such as metal threads or polymer filaments. For example, some suitable fabrics may include, but are not limited to, Albany 84M and 94M available through Albany International (Albany, NY) Asten 856, 866, 867, 892, 934, 939, 959, or 937; Asten Synweve Design 274, all of which are available through Asten Forming Fabrics, Inc. (Appleton, Wisconsin) and Voith 2164 available through Voith Fabrics (Appleton, Wisconsin). Forming fabrics or felts comprising the non-woven base layers can also be useful, including those from Scapa Corporation made with extruded polyurethane foams, such as from the Spectra Series.
    [21] Cellulosic fibers suitable for use in connection with this invention include secondary (or recycled) fibers for papermaking and virgin fibers for papermaking in all proportions. Such fibers include, without limitation, short fibers and long fibers as well as non-wood fibers. Synthetic cellulosic fibers can also be included as a portion of the mixture. It has been found that a high quality product having a unique balance of properties can be manufactured using predominantly secondary fibers or entirely secondary fibers.
    [22] Moisture-resistant resins can be added to the mixture as desired to increase the moisture resistance of the final product. Currently, the most used moisture resistance resins belong to the class of polymers called polyamide-polyamine epichlorohydrin resins. There are many commercial suppliers of these types of resins including Hercules, Inc. (Kymene (TM)), Henkel Corp (Fibrabond (TM)), Borden Chemical (Cascamide (TM)), Georgia-Pacific Corp and others. These polymers are characterized by having a polyamide structure containing reactive cross-linked groups distributed throughout the structure. Other useful moisture resistance agents are marketed by American Cyanamid under the trade name Parez (TM).
    [23] Similarly, dry strength resins can be added to the mixture as desired to increase the dry strength of the final product. Such dry strength resins include, but are not limited to, carboxymethyl cellulose (CMC), any type of starch, starch derivatives, gums, polyacrylamide resins, and others that are well known. Commercial suppliers of such resins are the same ones that supply the moisture resistant resins discussed above.
    [24] The wet weft 6 is then transferred from the forming fabric 3 to the transfer fabric 8 while at a consistency of solids between about 10 to about 35%, and especially between about 20 to about 30%. As used herein, a "transfer fabric" is a fabric that is positioned between the forming section and the drying section of the weft fabrication process.
    [25] The transfer to the transfer tissue 8 can be carried out with the aid of positive and / or negative pressure. For example, in one application, a vacuum shoe 9 can apply negative pressure so that the forming fabric 3 and the transfer fabric 8 converge and diverge simultaneously at the leading edge of the vacuum orifice. Typically, the vacuum shoe 9 provides pressure at levels between about 10 to about 25 inches (0.635 m) of mercury. As stated above, the vacuum transfer shoe 9 (negative pressure) can be supplemented or replaced by using positive pressure from the opposite side of the weft to blow the weft over the next fabric. In some applications, other vacuum shoes can also be used to assist in traction of the fibrous web 6 to the surface of the transfer fabric 8.
    [26] Transfer tissue 8 typically travels at a slower speed than forming fabric 3 to improve the MD and CD stretch of the weft, which generally refers to the elongation of a weft in its transverse direction (DC ) or in the machine direction (MD) (expressed as a percentage of elongation in the sample failure). For example, the relative speed difference between the two fabrics can be from about 1 to about 30%, in some applications from about 5 to about 20%, and in some applications, from about 10 to about 15% %. This is commonly referred to as the "race transfer". During the "race transfer", it is believed that many of the weft connections are broken, thus forcing the sheet to flex and bending in the depressions on the surface of the transfer fabric 8. Such molding to the contours of the surface of the transfer fabric 8 can increase the MD and CD stretch of the weft. The transfer of running from one fabric to another can follow the principles taught in any of the following U.S. Patent Nos. 5,667,636, 5,830,321, 4,440,597, 4,551,199, 4,849,054, all of which are incorporated herein by reference in a manner consistent with the present disclosure.
    [27] The wet weft 6 is then transferred from the transfer fabric 8 to a forced drying fabric 11. Typically, the transfer fabric 8 travels at approximately the same speed as the forced drying fabric 11. However , it has now been discovered that a second run transfer can be carried out as the weft is transferred from the transfer fabric 8 to a forced drying fabric 11. This transferred run is referred to here as occurring in the second position and is obtained through the operation of the fabric in forced drying 11 at a slower speed than the transfer fabric 8. When carrying out the run transfer in two different locations, that is, the first and the second position, a tissue paper product having a CD stretch increased can be produced.
    [28] In addition to the running transfer of the wet tissue paper web from the transfer tissue 8 to the forced drying tissue 11, the wet tissue paper web 6 can be macroscopically rearranged to mold to the surface of the forced drying tissue 11 with the aid of a vacuum transfer roller 12 or a vacuum transfer shoe like the vacuum shoe 9. If desired, the forced drying fabric 11 can be moved at a slower speed than the speed of the transfer fabric 8 to further increase the MD stretch of the resulting absorbent tissue paper product. The transfer can be performed with the aid of a vacuum to guarantee the conformation of the wet tissue paper 6 to the topography of the drying tissue 11.
    [29] While being supported by the drying fabric 11, the wet tissue paper web 6 is dried to a final consistency of about 94% or greater by a dryer 13. The web 15 then passes through the winding clamp between the drum of winding 22 and the reel 23 is wound on a roll of tissue paper 25 for subsequent conversion, such as guillotining, cutting, folding, and packaging.
    [30] The drying process can be any method of drying without compression that tends to preserve or increase the caliber or thickness of the wet weft including, without limitation, forced drying, infrared radiation, microwave drying, etc. Due to its commercial availability and practicality, forced drying is well known and is a preferred medium for drying without compression of the web for the purposes of the present invention. The forced drying process and equipment can be of a conventional type as is well known in the papermaking industry.
    [31] Since the wet tissue paper web 6 has been compressed dry, thus forming the dry tissue paper web 15, it is possible to crepe the dry tissue paper web 15 by transferring the tissue paper web 15 for a Yankee dryer prior to winding or using alternative methods such as micro creping as disclosed in U.S. Patent No. 4919877.
    [32] The basis weight of single layer tissue paper webs prepared in accordance with the present disclosure can be from about 10 to about 45 grams per square meter (gsm), more specifically from about 10 to about 40 gsm , even more specifically from about 15 to about 35 gsm, more specifically from about 20 to about 35 gsm and even more specifically from about 30 to about 35 gsm. Optionally, in some applications, the multilayer sheet with forced drying can be handled together to form a multilayer product having two, three, four or more layers. The base weight of a multilayer product depends on the number of layers and the base weight of each layer.
    [33] The tensile strengths MD and CD of the plots prepared in accordance with the present disclosure can be from about 400 to about 1800 grams or more per 3 inches (76, 2 mm) of sample width, more specifically about from 1000 to about 1600 grams per 3 inches (76, 2 mm) of sample width and even more specifically from about 1300 to about 1500 grams per 3 inches (76, 2 mm) of sample width. The ratio between MD traction and CD traction will generally be greater than 1, for example about 1.5 to about 2 and more specifically about 1.6 to about 1.8.
    [34] The geometric mean of the tensile strength (GMT) of wires prepared in accordance with the present disclosure can be about 500 to about 1500 grams by 3 inches (76.2 mm) wide, more specifically about 800 to about 1300 grams by 3 inches (76, 2 mm) wide and more specifically from about 900 to about 1200 grams by 3 inches (76, 2 mm) wide.
    [35] The MD stretch of wefts prepared in accordance with the present disclosure can be about 5% or greater, more specifically about 10% or greater, more specifically from about 10 to about 40% and more specifically from from about 15 to about 30%.
    [36] CD stretch fabrics prepared in accordance with the present disclosure may be about 5% or more, more specifically about 10% or more, more specifically about 5 to about 20%, more specifically about from 10 to about 20% and more specifically from about 15 to about 20%. The CD stretch of wefts prepared in accordance with the present disclosure can be substantially increased by several factors, primarily dividing the run transfer between two positions in the manufacturing process, and the MD stretch can be reduced by several factors in order to make the TEA - MD and TEA - CD substantially the same. In certain cases, the CD stretch can be approximately equal to the MD stretch.
    [37] The tissue paper webs of the present disclosure generally have a TEA - CD greater than about 6 grams-centimeters per square centimeter, more specifically from about 6 to about 8 grams-centimeters per square centimeter.
    [38] Plots prepared in accordance with the present disclosure may be layered or non-layered (combined). Layered tissue paper sheets can have two, three or more layers. For tissue paper sheets that will be converted into a single layer product, it may be advantageous to have three layers with the outer layers containing mainly short fibers and the inner layer containing mainly long fibers. Tissue paper sheets according to this invention would be suitable for all forms of tissue paper products, including, but not limited to, toilet tissue paper, kitchen towels, facial tissue papers and table napkins for consumer markets and services.
    [39] The various fabrics used to produce the towels of the present invention, particularly the paper with forced drying and the transfer fabric, have a topographic structure that transmits the three-dimensionality to the resulting tissue paper sheet or layer. This three-dimensionality in turn transmits the CD stretch to the sheet because the three-dimensional protrusions and / or elevations can be removed when the sheet is tensioned. This increased "topography" of the fabric is often referred to alternately as increased "effort" with respect to the fabric, and reflects the increased effort that is transmitted to the webs of material from which they are formed.
    [40] Suitable three-dimensional fabrics useful for the purposes of this invention are those fabrics with an upper surface and a lower surface. During moisture molding and / or forced drying, the upper surface supports the wet tissue paper web. The wet tissue paper web conforms to the top surface and during molding is stretched into a three-dimensional topographic shape corresponding to the three-dimensional topography of the upper surface of the fabric. Adjacent to the bottom surface, the fabric has a load-bearing layer, which integrates the fabric and provides a relatively smooth surface for contact with the various machine elements of tissue paper.
    [41] Fabrics can be woven or non-woven, or a combination of a fabric substrate with an extruded sculpture layer that provides the sculpted topographic layer. Fabrics can also be finished so that the meshes are parallel to the machine's transverse direction when moved on a tissue paper making machine, creating a series of protrusions in the machine's transverse direction, substantially continuous and separated by valleys.
    [42] The transfer fabrics and TAD fabrics used here have textured sheet contact surfaces comprising substantially continuous elevations in the machine direction separated by valleys and are similar to those described in U.S. Patent No. 6,673,202, incorporated herein by reference in a manner consistent with the present invention. In addition, such fabrics with layers carved into elevations can be extended to include elevations with a height of 0.4 to about 5 mm, an elevation width of 0.5 mm or more and a CD elevation frequency of about 1 , 5 to about 8 per centimeter. Specific styles of fabric described in this way include, for example, Voith Fabrics T1205-1, which has 3.02 ripples / cm and an elevation height of about 0.8 mm. Other fabrics with varying degrees of surface topography are also available.
    [43] In comparison, flat fabrics are commonly used in the manufacture of paper products, such as the 44GST fabric pattern available through Voith Fabrics have much less topography than TAD fabrics with textured sheet contact surfaces used on here. Such flat tissues do not have considerable topography. Subsequently, a low topography (or "flat") fabric will generally transmit very little CD tension to the weft fiber.
    [44] Other fabrics suitable for use as a transfer fabric or TAD fabric may have textured surfaces in contact with the sheet containing a pattern similar to a "waffle" consisting of elevations in the direction of both the machine and transverse to the machine with sculpted layers which have a peak height (from the lowest element in contact with tissue paper to the highest element) ranging from 0.5 to about 8 mm, and a frequency of occurrence of the two-dimensional pattern from about 0.8 to about 3.6 per square centimeter of fabric. EXAMPLES Example 1
    [45] The paper samples were produced as described in U.S. Patent No. 5,772,845, the disclosure of which is incorporated herein by reference, in a manner consistent with the present disclosure, on a paper machine with a fabric of formation, a transfer fabric and a fabric with forced drying. A single layer tissue paper was produced with a 40 gsm BW target using a combined mixture of 50% by weight of the "Northern Softwood" fiber and 50% of eucalyptus fibers. The mixture was not refined and no chemicals were added.
    [46] For all codes, the total transfer level per run was set at 28%, that is, the TAD fabric was adjusted to be moved at a speed that was 28% slower than the training fabric. For the control samples (Sample No. 1, 6, 9 and 14) the entire run transfer was performed as the weave was transferred from the transfer fabric (first position). For the samples of the invention a total transfer portion was performed as the weft was transferred from the transfer fabric to the TAD fabric (second position). In each example, it is not important whether the race transfer was performed in the first, second or both positions, the total race transfer was 28%. For the samples of the invention the race transfer was divided between the first and second positions, as follows: 7/21, 14/14, 7/21 and 0/28, where the first value represents the percentage of race transfer occurring in the the first position and the second represents the percentage of race transfer that occurs in the second position. The forming fabric was a Voith 2164, the TAD fabric was the fabric described as "Jack" in U.S. Patent No. 7,611,607, which is incorporated herein in a manner consistent with the present disclosure, and the transfer fabrics were a Voith 2164 or the fabric described as "Jetson" in U.S. Patent No. 7,611,607, as specified in Table 1 below.
    [47] For each sample, machine conditions and chemical additions were kept constant and no effort was made to compensate for changes caused by race transfer changes. Similarly, unless specified, other variables such as vacuum levels, TAD and coil settings, and shredder conditions were left constant, in order to observe only the changes caused by the changes in the race transfer locations. The resulting physical characteristics are summarized in Table 2, below. In Table 2, the designation of R or R2 after a code number reflects repeated production for a given code. For example, 1R is a repetition of code 1 and 1R2 is the second repetition of code 1. The repetitions were produced to ensure the reproducibility of the experimental data. TABLE 1
    TABLE 2

    [48] Additional parameters can be calculated from the data in Table 2, which are presented in Table 3, below. As shown below, in samples where the run transfer is split between the first and second positions, the ratio of the MD / CD slopes is reduced compared to the controls, with some samples of around 1 or less. MD / CD slope rates of about 1 or less suggest that the samples have approximately equal stiffness in both the DM and CD directions. Samples prepared according to the prior art methods, on the other hand, have MD / CD slope rates greater than 1 and in some cases around 2. TABLE 3

    [49] From the data in Tables 2 and 3, several graphs were constructed illustrating how the properties change with the transition of part of the race transfer from the first position to the second. Of particular interest is the change in the CD stretch, as the race transfer is transferred from the first position to the second. FIGURE 1 includes the first eight samples (samples 1-5 and also 1R, 2R and 1R2) and presents the CD stretch as a function of how much run transfer was done at the second location for the use of high transfer levels at vacuum and the fabric package. As shown in FIGURE 2, the CD stretch increased continuously as the percentage of total run transfer that occurs in the second position increases. A similar result is illustrated in FIGURE 3, which illustrates samples similar to those shown in FIGURE 2, but with the transfer voids reduced to a lower level. FIGURE 3 includes data from examples 6, 7 and 8, that is, the sample codes produced using the transfer vacuum levels of about 8 inches (203.2 mm) of mercury compared to 11 inches (279.4 mm) for the samples in FIGURE 2. A similar trend of increasing the CD stretch is seen in FIGURE 4, which illustrates, samples 9-13, plus code 9R, which were produced using the specific combination of tissue and levels of high transfer vacuum.
    [50] FIGURE 5 shows data similar to FIGURE 4, but for samples produced using low transfer vacuum levels similar to samples 6, 7 and 8, illustrated in FIGURE 3. FIGURE 5 illustrates samples prepared using the specified combination of fabric, with low levels of transfer vacuum, which apparently do not have as much impact on the CD stretch compared to the high vacuum levels, both in shape as well as in the absolute stretch levels.
    [51] In addition to the CD stretch, another property of the sheet important for durability is the TEA - CD. FIGURE 6 illustrates the effect on the TEA - CD as the percentage of total run transfer that occurs in the second position increases. As shown in FIGURE 6, the TEA - CD increases continuously with the greater run transfer from the second position, just as the CD stretch increases. Example 2
    [52] Samples of tissue paper products were manufactured, largely as described in Example 1 using the "Jetson" transfer fabric as specified in Table 1, above, with the exception that the base sheets had two layers and that each one of these was made up of three layers. The first layer contained eucalyptus (33% by weight of the total layer), the second layer composed of "Northern Softwood Kraft" (34% by total weight of the layer) and the third layer composed of eucalyptus (33% of the total weight of the layer) . The control tissue paper products were produced with various geometric mean values of tensile strength to allow a comparison with the codes of the invention in constant tensile strength. This was necessary because many properties of tissue paper products, such as stretching, are affected by the product's tensile strength. The traction was controlled by adding "Baystrength" additive for dry and refining resistance. The samples were prepared as indicated in Table 4. The resulting physical characteristics are summarized in Table 5, below. TABLE 4

    TABLE 6

    [53] As shown in Tables 5 and 6, the properties in the transverse direction of the base sheet have been improved by dividing the run transfer between the first and second positions. Comparing samples 4 and 5 to control sample 3, which has similar CD tensile strength (controls 1 and 2 are significantly less resistant in the CD direction), it can be seen that the CD stretch is improved through the run transfer operation divided. In addition, the CD slope and therefore the CD stiffness was also much lower. The same result is shown in the comparison of the control sample 6 with the samples of the invention 7, 8 and 9, which were all prepared by dividing the race transfer between the first and second positions. Again, the CD stretch is increased by dividing the run transfer and thus the CD slope is reduced.
    [54] A desirable result is also achieved in terms of optimizing the properties of the weave between the stretch MD and CD. Samples prepared in accordance with the present invention showed the additional benefit of having essentially equal MD and CD stretch, while maintaining high CD stretch values. This is characterized by the proportion of MDS / CDS, which may desirably be about 1 or less, such as about 0.9 or even more preferably about 0.8, while maintaining the desired desirable CD stretch greater. than about 15%.
    [55] The product was then converted into rolls of 2-layer tissue paper products using standard conversion technology. Each two-layer roll was converted without embossing or calendering and rolled to achieve a target "Kershaw" firmness of 5.5 to 7.5 with a roll diameter of about 125 mm. The properties of the roll after conversion and the sheet are shown in the table below. TABLE 7

    [56] Inventive samples (samples 13 and 15) have a higher volume / firmness ratio, and improved CD stretch. For example, inventive sample 13 has a higher volume (greater than 22 cc / g) and improved firmness (less than 7 mm, where a lower Kershaw firmness indicates a firmer, therefore preferred roll) compared to controls. The same comparison can be made between the inventive sample 15 and the control sample 14. The inventive samples also have a CD slope less than a constant CD pull. For example, the inventive sample 13 has a CD slope less than any of the control samples and the inventive sample 15 has the same CD slope as the control sample 14, despite being 65 grams less in CD tensile strength.
    [57] Although the invention has been described in detail with respect to its specific applications, it will be understood that those skilled in the art, once an understanding of the above has been achieved, can easily devise changes to, variations on, and equivalents to these applications. Consequently, the scope of the present invention must be assessed as that of the appended claims and any of their equivalents.
    权利要求:
    Claims (8)
    [0001]
    1. Method of fabricating a TISSUE paper web comprising the steps of: (a) depositing an aqueous suspension of paper-making fibers on a forming fabric (3) moving at a first rate of speed to form a web wet 96); (b) dehydrating the web to a consistency of about 20% or greater; characterized by the fact that it further comprises: (c) transferring the dehydrated web to a transfer fabric (8), the transfer fabric (8) moving at a speed rate of 1 to 30% lower than the speed of the formation fabric (3); (d) transferring the weft by running to a fabric in forced drying (11), the fabric in forced drying (11) moving at a rate of speed lower than the speed of the transfer fabric (8); and (e) forcibly drying the web.
    [0002]
    Method according to claim 1, characterized in that the transfer tissue moves at a rate of speed of 5 to 15% lower than the speed of the forming tissue.
    [0003]
    Method according to claim 1 or 2, characterized by the fact that the fabric with forced drying moves at a speed rate of 5 to 15% lower than the speed of the forming fabric.
    [0004]
    Method according to any one of claims 1 to 3, characterized in that it additionally comprises the step of calendering the web with forced drying.
    [0005]
    Method according to any one of claims 1 to 4, characterized in that it additionally comprises the step of creping the web with forced drying.
    [0006]
    Method according to any one of claims 1 to 4, characterized in that the weft with forced drying is not creped.
    [0007]
    Method according to any one of claims 1 to 6, characterized in that it forcibly dries the web to form a TISSUE paper product having a CD stretch greater than 5% and a CD tensile strength greater than 800 grams per 3 inches (7.62 mm).
    [0008]
    Method according to any one of claims 1 to 7, characterized in that the general speed differential between the forming fabric (3) and the forced drying fabric (11) is 10 to 50%.
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    同族专利:
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    法律状态:
    2017-04-11| B15I| Others concerning applications: loss of priority|Free format text: PERDA DA PRIORIDADE REQUERIDA US 13/238,798 DE 21.09.2011, POIS POSSUI DEPOSITANTE DIFERENTE DO INFORMADO NA ENTRADA NA FASE NACIONAL E SUA RESPECTIVA CESSAO NAO FOI APRESENTADA, MOTIVO PELO QUAL SERA DADA PERDA DESTA PRIORIDADE, CONFORME AS DISPOSICOES PREVISTAS NA LEI 9.279 DE 14/05/1996 (LPI) ART. 167O. |
    2017-06-27| B12F| Other appeals [chapter 12.6 patent gazette]|
    2019-01-08| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|
    2019-07-30| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|
    2020-11-03| B06A| Patent application procedure suspended [chapter 6.1 patent gazette]|
    2021-02-17| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|
    2021-03-30| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 09/08/2012, OBSERVADAS AS CONDICOES LEGAIS. |
    优先权:
    申请号 | 申请日 | 专利标题
    US13/238,798|2011-09-21|
    US13/238,798|US8574399B2|2011-09-21|2011-09-21|Tissue products having a high degree of cross machine direction stretch|
    PCT/IB2012/054069|WO2013041988A2|2011-09-21|2012-08-09|Tissue products having a high degree of cross machine direction stretch|
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