CN111976240A - Composite fabrics and bras made from the same materials and related methods - Google Patents

Abstract

The present invention relates to composite fabrics and brassieres made from such materials and related methods, and more particularly to a fabric sheet comprising a knitted first yarn for defining a first face of the sheet and comprising Thermoplastic Polyurethane (TPU) elastomeric monofilaments and a knitted second yarn for defining an opposite second face of the sheet and comprising fibers, the second yarn knitted with the first yarn to join the first and second yarns together.

Description

Composite fabrics and bras made from the same materials and related methods

technical field

The present invention relates to composite fabrics and bras made from such materials and related methods.

Background technique

One-piece molded bras currently exist on the market. They are called "one piece bras" because the cup area of the bra is formed from a single piece (which may be a laminated construction), although other accessories such as clasps, straps and reinforcements are also used. This bra is usually made by gluing two pieces of fabric together. This glue bond is usually made effective by applying some pressure and heat. The glue usually used is of industrial grade. Glue can be applied to desired areas on the inside of one of the two pieces of fabric, such as along certain edges of the intended bra to be cut from the sheet and then formed into the shape of a bra. However, using this glue can increase the manufacturing time and cost (labor and materials) of a one-piece bra. In addition, industrial glues usually contain chemical solvents, which are not environmentally friendly when used in large quantities. Another time-consuming aspect of making a one-piece bra is providing the bra's covered edges. It is often necessary to avoid fraying along some of the edges of the bra. The edges need to be covered, eg by fabric folding, further increasing the time and cost (labor and materials) of manufacture.

SUMMARY OF THE INVENTION

In this specification, patent specifications, other external documents, or other sources of information are generally cited to provide a context for discussing the features of the invention. Unless specifically stated otherwise, references to these external documents should not be construed as an admission that these documents or such sources of information are prior art or form part of the common general knowledge in the field in any jurisdiction.

For the purposes of this specification, where method steps are described sequentially, that order does not necessarily imply that the steps are chronologically ordered in that order, unless there is no other logical way to explain the order.

Accordingly, it is an object of the present invention to provide a composite fabric and related method that overcomes or at least partially ameliorates some of the above disadvantages or at least provides the public with a useful choice. It is also an object of the present invention to provide a brassiere made from a composite fabric that overcomes or at least partially ameliorates some of the above disadvantages, or at least provides the public with a useful choice.

In a first aspect, the present invention relates broadly to fabric sheets comprising:

a. a knitted first yarn for defining a first face side of the sheet and comprising thermoplastic polyurethane (TPU) elastic monofilaments,

b. Knitted second yarn for defining the opposite second face side of the sheet and including fibers, the second yarn knitted with the first yarn to make the first yarn and the second yarn Yarns are joined together.

Preferably, the second yarn comprises fibers selected from rayon.

Preferably, the second yarn comprises fibers selected from at least one of nylon, polyester and acrylic.

Preferably, the second yarn comprises a plurality of fibers selected from at least two of nylon, polyester and acrylic.

Preferably, the second yarn comprises fibers selected from natural fibers.

Preferably, the second yarn comprises fibers selected from at least one of cotton and wool.

Preferably, the second yarn comprises a variety of fibers selected from wool and cotton.

Preferably, the second yarn comprises a plurality of fibers selected from at least two of wool, cotton, nylon, polyester and acrylic.

Preferably, the monofilaments of the first yarn comprise monofilaments of melt-spun fibers made from a resin comprising the reaction product of:

(i) a hydroxyl terminated polyester intermediate derived from a dicarboxylic acid and a blend of at least two alkylene glycols, wherein the number average molecular weights of the two alkylene glycols differ by at least 20%;

(ii) diisocyanates, and

(iii) linear alkylene glycol chain extenders;

wherein the resin has a weight average molecular weight of at least 600,000; and wherein the resin is further reacted with the following reagents:

(iv) reagents comprising the reaction product of polyalkylene ether glycol and diisocyanate;

wherein the fibers have a weight average molecular weight of at least 700,000.

Preferably, the monofilaments of the first yarn consist of monofilaments of melt-spun fibers made from a resin comprising the reaction product of:

(i) a hydroxyl terminated polyester intermediate derived from a dicarboxylic acid and a blend of at least two alkylene glycols, wherein the number average molecular weights of the two alkylene glycols differ by at least 20%;

(ii) diisocyanates, and

(iii) linear alkylene glycol chain extenders;

wherein the resin has a weight average molecular weight of at least 600,000; and wherein the resin is further reacted with the following reagents:

(iv) reagents comprising the reaction product of polyalkylene ether glycol and diisocyanate;

wherein the fibers have a weight average molecular weight of at least 700,000.

Preferably, the monofilament is as described in claim 1 of US Pat. No. 9,688,805, in particular, it is made of a resin comprising the reaction product of:

(i) a hydroxyl terminated polyester intermediate derived from a dicarboxylic acid and a blend of at least two alkylene glycols, wherein the number average molecular weights of the two alkylene glycols differ by at least 20%;

(ii) diisocyanates, and

(iii) linear alkylene glycol chain extenders;

wherein the resin has a weight average molecular weight of at least 600,000; and wherein the resin is further reacted with the following reagents:

(iv) Reagents comprising the reaction product of polyalkylene ether glycol and diisocyanate.

Preferably, the first and second yarns are connected by knitting.

Preferably, the first and second yarns are joined without the use of an adhesive.

Preferably, the first and second yarns are connected only by knitting.

Preferably, the first yarn consists of thermoplastic polyurethane (TPU) elastic monofilaments.

Preferably, the first yarn is a knitting yarn composed of thermoplastic polyurethane (TPU) elastomeric monofilaments.

Preferably, the second yarn is a monofilament.

Preferably, the second yarn is provided as a multifilament.

In a second aspect, the present invention provides a composite fabric comprising a first layer of a fabric sheet as defined herein and a second layer of a fabric sheet as defined herein, the second layer using its first yarns with the first layer's The first yarn is melt-bonded.

Preferably, the composite fabric is formed by applying pressure and heat to the first and second layers to press and bond them together.

Preferably, when the first and second layers are pressed together, at least one of the two plies of the first and second layers has more Embossed area resulting from greater pressure.

Preferably, the composite fabric consists of a first layer of fabric sheet as defined herein and a second layer of fabric sheet as defined herein, said second layer being fusion bonded with its first yarns to the first yarns of said first layer .

Preferably, the first layer is bonded to the second layer by applying pressure and heat to the first and second layers while bonding the layers together.

Preferably, the first layer is bonded to the second layer without the use of an adhesive.

Preferably, the surface of the fabric that has been embossed has a different texture than areas not so embossed.

Preferably, the different textures are caused by embossing.

Preferably, the composite fabric is used as a component of a one-piece formed brassiere.

In another aspect, the present invention provides a method of forming a composite fabric, the method comprising applying heat and pressure to two layers of fabric as defined herein, the two layers of fabric being positioned with their first faces abutting each other to The first yarns of the two layers are melt bonded to each other.

Preferably, at least one region of the two layers is subjected to greater pressure than the other regions of the two layers.

Preferably, at least one region of the two layers is subjected to greater pressure than the other regions, so that at least one of the layers is imprinted at the at least one region.

Preferably, at least one region of the two layers is subjected to greater pressure than the other regions to induce a texture change on at least one of the layers at the at least one region.

The invention may also broadly include the components, elements and features referred to or indicated in the specification of this application, individually or collectively, and any and all combinations of any two or more of said components, elements or features, and herein References to specific integers having equivalents known in the art to which this invention pertains are considered to be incorporated herein as if individually listed.

To those skilled in the art to which this invention relates, the many variations and widely different embodiments and applications of the present invention will suggest themselves without departing from the scope of the invention as defined by the appended claims. The disclosure and description herein are purely illustrative and are not intended to be limiting in any way.

As used herein, the term "and/or" means "and" or "or", or both.

As used herein, an "s" following a noun indicates the plural and/or singular form of the noun.

As used in this specification and claims, the term "comprising" means "consisting, at least in part, of." When interpreting each expression in this specification and the claims including the term "comprising", there are also features other than that feature or features guided by this term. Related terms such as "including" and "comprising" are to be interpreted in the same manner.

Other aspects of the invention will become apparent from the following description, given by way of example only and with reference to the accompanying drawings.

Description of drawings

Preferred embodiments of the present invention will be described, by way of example only, with reference to the accompanying drawings, wherein:

Figure 1 shows a fabric sheet in perspective, partially exploded to show its preferred 2-yarn configuration,

Figure 2 is an exploded cross-sectional view through the fabric sheet of Figure 1 showing the knitting properties of the first and second yarns,

Figure 3a is a cross-sectional view through section X-X of Figure 2 showing a first yarn comprising monofilaments,

Figure 3b is a cross-sectional view through section X-X of Figure 2, showing a first yarn comprising monofilaments and a second yarn comprising monofilaments as an alternative to that shown in Figure 3a,

Figure 4 is a perspective view of a composite fabric comprising two layers of the fabric sheet of Figure 1,

Figure 5 is a close-up view of the composite fabric of Figure 4,

Figure 6 shows a view through section AA of Figure 4 to illustrate that pattern B is imprinted into the surface of the composite fabric,

Figure 7 shows a consolidation press for loosely joining two fabric sheets together prior to subsequent adhesive consolidation of the two sheets in a hot press,

Figure 8 shows the loosely consolidated fabric sheet before entering the heat press,

Figure 9 shows a heat press that can be used to bond and consolidate a fabric sheet with an optional forming insert that can be used to define color and/or surface texture changes on the surface of the fabric sheet, which can be on the fabric piece during the knotting process,

Figure 10 shows the composite fabric and the outlines of the pattern and bra assembly that have been defined on the outer surface of the composite fabric,

Figure 11 shows a bra assembly cut (eg by laser cutting) from a composite fabric,

Figure 12 shows a knitted diagram showing two plies and their assembly, together showing a cross section of each row.

Detailed ways

The present invention relates to fabric sheets, composite fabrics, methods of construction and uses thereof including, but not limited to, use as components in bras. In a preferred form, the bra is a formed bra, which may be of the type known as a one-piece formed bra.

Referring to Figure 1, a fabric sheet 1 is shown. The fabric pieces can have a wide range of sizes and can be trimmed or cut for subsequent use for a specific purpose or application. For example, it is available as a roll.

The fabric sheet includes a knitted first yarn 2 and a knitted second yarn 3 . The knitted first yarn 2 preferably defines the first face 2A of the fabric sheet 1 . The knitted second yarn 3 preferably defines a second face 3A opposite the first face 2A. Preferably, these two yarns are the only yarns of the fabric sheet. The first yarn 2 is preferably a knitting yarn. The second yarn 3 is also a knitting yarn.

The first yarn 2 and the second yarn 3 are mechanically connected. This can be achieved, for example, by knitting processes well known in the industry. The knitting used to connect the first and second yarns may be warp knitting and/or weft knitting. An example of this configuration can be seen in FIG. 12 . Preferably no adhesive is used to join the yarns together.

The first yarn includes thermoplastic polyurethane (TPU) elastic monofilaments. The first yarn preferably consists only of this monofilament.

This can be seen in the cross section in Figure 3, where the monofilament 6 is shown. A monofilament is still a monofilament, rather than a yarn spun into multiple monofilaments to form a multifilament yarn. The thermoplastic polyurethane elastomer monofilament is preferably of the kind described in US Pat. No. 9,688,805, in particular, the thermoplastic polyurethane elastomer monofilament is made from a resin comprising the reaction product of (i) a hydroxyl terminated poly an ester intermediate derived from a dicarboxylic acid and a blend of at least two alkylene glycols, wherein the number average molecular weights of the two alkylene glycols differ by at least 20%; (ii) a diisocyanate, and (iii) a linear alkylene glycol chain extender; wherein the resin has a weight average molecular weight of at least 600,000; and wherein the resin is further reacted with: (iv) a polyalkylene ether glycol and a diisocyanate reagents for the reaction product. Fibers under the trademark X4zol ^™ -J can be used. It is a TPU elastomeric monofilament that is manufactured differently than elastane. It can be produced by melt extrusion, which does not require the use of solvents. The entire content of US9688805, published June 27, 2017, is incorporated herein by reference. Preferably, the monofilament of the first yarn as claimed herein is defined as a melt-spun fiber in the claims of US9688805 published on June 27, 2017, in particular, the melt-spun fiber is composed of a reaction product comprising: resins made from: (i) a hydroxyl terminated polyester intermediate derived from a blend of a dicarboxylic acid and at least two alkylene glycols, wherein the number average molecular weight of two of said alkylene glycols differ by at least 20%; (ii) a diisocyanate, and (iii) a linear alkylene glycol chain extender; wherein the resin has a weight average molecular weight of at least 600,000; and wherein the resin is further reacted with: ( iv) A reagent comprising the reaction product of a polyalkylene ether glycol and a diisocyanate; wherein the fibers have a weight average molecular weight of at least 700,000. In one embodiment, component (iv) is derived from a polyalkylene ether glycol comprising polytetramethylene ether glycol. In one embodiment, component (iv) is derived from a diisocyanate comprising methylene diphenyl diisocyanate. In one embodiment, component (i) is derived from a carboxylic acid comprising adipic acid. In one embodiment, component (i) is derived from a mixture of 1,4-butanediol and 1,6-hexanediol in a mixing ratio of 25:75 to 75:25 by weight. In one embodiment, component (ii) comprises methylene diphenyl diisocyanate. In one embodiment, component (iii) comprises 1,4-butanediol, 1,6-hexanediol, or a combination thereof.

The second yarn may comprise fibers selected from natural fibers. For example, the fibers can be cotton or wool.

Alternatively, the second yarn may comprise rayon. Man-made fibers can be nylon, polyester or acrylic. The second yarn can be made from a blend of these materials.

The second yarn may present itself as a multifilament. It can be made from yarn of a single type of fiber, or from a blend of fibers. Or it can be made of monofilament. The denier of the second yarn may be approximately between 20 denier and 350 denier.

The denier of the first yarn monofilament may be between 20 denier and 50 denier.

The fabric sheet of FIG. 1 can be used to construct the composite fabric 10 shown in FIG. 4 . The composite fabric preferably comprises two sheets of Figure 1, as shown in Figure 4, connected in overlapping relationship to each other. For illustrative purposes only, FIG. 4 shows the first sheet 1A peeled from the second fabric sheet 1B. As shown in Figure 4, the two fabric sheets 1A and 1B are bonded together by the first front faces 2A and 2B of the sheets facing each other. The second front faces 3A and 3B define opposing outwardly facing surfaces of the composite fabric 10 .

The two sheets 1A and 1B are bonded in a process to be described below.

Referring to Figures 4-6, sheet 1 may be used in a fabric composite. In a preferred form, this is achieved by pressing the two sheets 1A and 1B together with their first faces. This means that the first yarn of one sheet is pressed against the first yarn of another sheet of the same material. See Figures 4-6. The process may involve placing two fabric pieces back-to-back with their first fabric layers in contact with each other. A first consolidation step may be employed and may involve the use of a press 20 as shown in FIG. 7 .

The two sheets 1A and 1B are placed in a press and then pressure is applied to the two sheets 1A and 1B to bond them together. This bond may be a weak bond for subsequent placement of the consolidated sheet in another press or pressing operation. This weak bond holds the sheets together so that they do not slip away from each other during the next heating step. Sheets of paper can be placed on the bottom and top of the bonded sheet to avoid dirt from adhering to the surface of the bonded fabric.

Such a consolidated sheet 1C as shown in FIG. 8 can be taken out from the press 20 and placed in the press 21 .

Press 21 may be a press that may apply pressure and/or heat to the consolidated sheets to further consolidate them together. It can be an electric press. Consolidation will fusion bond the two sheets 1A and 1B together. In particular, it is the front faces 2A and 2B of the two sheets that are fused together. There is no fusion bond between the first and second yarns of each sheet. Only the first yarns are melt-bonded together.

As in the previous step, a sheet of paper can be used to prevent soils from adhering to the surface of the combined fabric/new fabric.

In a preferred form, a forming insert 23 may be placed at a desired location on the outer surface of the second yarn of a sheet (eg, sheet 1A as shown in Figure 9). The insert can be made of thin materials such as cardboard or silicon or metal. The insert has a preselected shape (and may include an internal cutout) and is placed on the appropriate portion of the consolidation sheet so that when the press applies heat and/or pressure to the consolidation sheet, the insert 23 is trapped in the press and consolidation sheet in between to put extra pressure on the area it's in. This will cause the material in this area to become more compact during the pressing process. The result is an imprint, as shown in area B in the figure. This results in a fabric with embossed/embossed areas. This may also be accompanied by a change in the texture of the yarn, making the pattern texturally and optically different from the rest of the outer surface of the second yarn of the sheet. Such texture changes can lead to changes in visual appearance.

The first yarn can be white, which is the color of X4zol ^™ -J, and the second yarn can be any color, depending on the fiber material used to construct the second yarn.

Regardless of whether any part of the bonded fabric is covered by the silicone sheet during hot pressing, the two sheets are thereby thermally bonded together by melting, forming a new fabric with its own technical characteristics.

Once pressed, the pressed sheet 1D can be removed from the mold and subsequently cut, for example along cutting line 26, to remove components used as part of an undergarment such as a bra. As an example, assembly 28 may have a shape that defines portions of the cups and/or shoulder and chest straps of a bra. For example, the cutting assembly can be 3D shaped to form a breast cup. Bras are one example of garments that may be constructed using the composite fabrics described herein. Thereafter, the hooks/eyes/straps of the bra can be sewn or attached by any common method. If desired, the upholstery fabric or other components can be sewn or attached to the top of the composite fabric by any conventional method. It is contemplated that the upholstery fabric could be folded around the perimeter of the bra to cover the perimeter of the bra for a smoother edge.

Composite fabrics and components cut from the fabric constructed in this manner may not require any edge covering steps to prevent or reduce abrasion of material at the edges. The edges of the new fabric thus formed will not fray even after being cut by different common methods (eg mechanical cutters, scissors, ultrasonics, laser cutters). The monofilament layers are already melted and fused together, which helps prevent fraying since the other yarns cannot unravel after the first fabric layer (ie, the monofilament layer) is melted.

Since the two sheets are thermally bonded together by fusion, the composite fabric has its own technical properties. These properties may mainly depend on what the material of the second yarn is.

The fusion bonding of the monofilaments of the first yarn knitted changed the properties, but the composite fabric remained elastic in all directions.

In the foregoing description, reference is made to elements or integers having known equivalents, and then such equivalents are included as if they were individually listed.

While the invention has been described by way of example and with reference to specific embodiments, it should be understood that modifications and/or improvements may be made without departing from the scope or spirit of the invention.

Additionally, where features or aspects of the invention are described in terms of a Markush group, those skilled in the art will recognize that the invention is thus also described in terms of any individual member or subgroup of members of the Markush group.

Claims (31)

1. A fabric sheet comprising:

a. a knitted first yarn for defining a first face side of the sheet and comprising Thermoplastic Polyurethane (TPU) elastomeric monofilaments,

b. a knitted second yarn for defining an opposite second face of the sheet and comprising fibers, the second yarn knitted with the first yarn to join the first and second yarns together.

2. The fabric sheet of claim 1 wherein said second yarns comprise fibers selected from rayon.

3. The fabric sheet of claim 1 wherein said second yarns comprise fibers selected from at least one of nylon, polyester, and acrylic.

4. The fabric sheet of claim 1 wherein said second yarns comprise a plurality of fibers selected from at least two of nylon, polyester, and acrylic.

5. The fabric sheet of claim 1 wherein said second yarns comprise fibers selected from natural fibers.

6. The fabric sheet of claim 1 wherein said second yarns comprise fibers selected from at least one of cotton and wool.

7. The fabric sheet of claim 1 wherein said second yarns comprise a plurality of fibers selected from the group consisting of wool and cotton.

8. The fabric sheet of claim 1 wherein said second yarns comprise a plurality of fibers selected from at least two of wool, cotton, nylon, polyester, and acrylic.

9. The fabric sheet of claim 1 wherein the filaments of the first yarns comprise filaments of meltspun fibers made from a resin comprising the reaction product of:

(i) a hydroxyl terminated polyester intermediate derived from a blend of a dicarboxylic acid and at least two alkylene glycols, wherein the number average molecular weights of the two alkylene glycols differ by at least 20%;

(ii) A diisocyanate, and

(iii) a linear alkylene glycol chain extender;

wherein the weight average molecular weight of the resin is at least 600,000; and wherein the resin is further reacted with:

(iv) a reagent comprising the reaction product of a polyalkylene ether glycol and a diisocyanate;

wherein the fibers have a weight average molecular weight of at least 700,000.

10. The fabric sheet of claim 1 wherein the filaments of the first yarns are comprised of filaments of meltspun fibers made from a resin comprising the reaction product of:

(i) a hydroxyl terminated polyester intermediate derived from a blend of a dicarboxylic acid and at least two alkylene glycols, wherein the number average molecular weights of the two alkylene glycols differ by at least 20%;

(ii) a diisocyanate, and

(iii) a linear alkylene glycol chain extender;

wherein the weight average molecular weight of the resin is at least 600,000; and wherein the resin is further reacted with:

(iv) a reagent comprising the reaction product of a polyalkylene ether glycol and a diisocyanate;

wherein the fibers have a weight average molecular weight of at least 700,000.

11. The fabric sheet of claim 1 wherein said monofilaments are made of a resin comprising the reaction product of:

(i) A hydroxyl terminated polyester intermediate derived from a blend of a dicarboxylic acid and at least two alkylene glycols, wherein the number average molecular weights of the two alkylene glycols differ by at least 20%;

(ii) a diisocyanate, and

(iii) a linear alkylene glycol chain extender;

wherein the weight average molecular weight of the resin is at least 600,000; and wherein the resin is further reacted with:

(iv) a reagent comprising the reaction product of a polyalkylene ether glycol and a diisocyanate.

12. The fabric sheet of claim 1 wherein said first and second yarns are joined by knitting.

13. The fabric sheet of claim 1 wherein said first and second yarns are joined without the use of an adhesive.

14. The fabric sheet of claim 1 wherein said first and second yarns are connected only by knitting.

15. The fabric sheet of claim 1 wherein said first yarns are comprised of Thermoplastic Polyurethane (TPU) elastomeric monofilaments.

16. The fabric sheet of claim 1 wherein said first yarn is a knitting yarn comprised of Thermoplastic Polyurethane (TPU) elastomeric monofilament.

17. The fabric sheet of claim 1 wherein said second yarns are monofilaments.

18. The fabric sheet of claim 1 wherein said second yarns are provided as multifilaments.

19. A composite fabric comprising a first layer of the fabric sheet of claim 1 and a second layer of the fabric sheet of claim 1, the second layer being melt bonded with its first yarns to the first yarns of the first layer.

20. The composite fabric of claim 19, formed by applying pressure and heat to the first and second layers to press them together and bond them together.

21. The composite fabric of claim 19, wherein at least one of the second plies of the first and second layers has an embossed area created by applying greater pressure in the embossed area than in the non-embossed area when the first and second layers are pressed together.

22. The composite fabric of claim 19, wherein the first layer is bonded to the second layer by pressure and heat that has been applied to the first and second layers while the layers are bonded together.

23. The composite fabric of claim 19, wherein the first layer is bonded to the second layer without the use of an adhesive.

24. The composite fabric of claim 19, wherein the fabric surface that has been embossed has a different texture than the areas that have not been so embossed.

25. The composite fabric of claim 24, wherein the different texture is caused by embossing.

26. The composite fabric of claim 19, for use as a component of a one-piece molded brassiere.

27. A composite fabric, wherein the composite fabric is comprised of a first layer of fabric sheets and a second layer of fabric sheets, the first layer of fabric sheets comprising:

a. a knitted first yarn for defining a first face side of the sheet and comprising Thermoplastic Polyurethane (TPU) elastomeric monofilaments,

b. a knitted second yarn for defining an opposite second face of the sheet and comprising fibers, the second yarn knitted with the first yarn to join the first yarn and the second yarn together,

the second layer of fabric sheet comprises:

c. a knitted first yarn for defining a first face side of the sheet and comprising Thermoplastic Polyurethane (TPU) elastomeric monofilaments,

d. a knitted second yarn for defining an opposite second face of the sheet and comprising fibers, the second yarn knitted with the first yarn to join the first and second yarns together,

The second layer is melt bonded with its first yarns to the first yarns of the first layer.

28. A method of forming a composite fabric comprising applying heat and pressure to two layers of the fabric sheet of claim 1, the two layers of fabric sheet being positioned with their first face sides abutting each other such that the first yarns of the two layers are melt bonded to each other.

29. The method of claim 28, wherein at least one region of the two layers is subjected to a greater pressure than the other regions of the two layers.

30. The method of claim 28, wherein at least one region of the two layers is subjected to a greater pressure than the other regions, such that at least one of the layers is imprinted at the at least one region.

31. The method of claim 28, wherein at least one region of the two layers is subjected to greater pressure than the other regions to cause texture variations on at least one of the layers at the at least one region.

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