Methods of making cotton blend glue brassieres

CA 02490785 2009-11-23

METHODS OF MAKING COTTON BLEND GLUE BRASSIERES

BACKGROUND OF THE INVENTION

1. Field of the Invention

[0001] The present invention relates to brassieres. More particularly, the present invention relates to methods of making cotton blend glue brassieres. Such brassieres include a finished edge that does not require separate binding or narrow edge finishing.

. Description of Related Art

[0002] It is well known that the comfortability of wearing of a brassiere is improved when the brassiere is made of a material that is soft and supple, yet capable of providing shape and control to support the breasts of the wearer. Natural fabrics, such as cotton, and blends of natural and synthetic fabrics, such as cotton, polyester and spandex, are a popular choice for making brassieres. These fabrics are soft and flexible, yet they shape and contour the breasts of the wearer. The comfortability of a brassiere is also improved when a brassiere does not have seams or elastic bands that may dig in and constrict the blood flow in the torso area of the wearer.

[0003] Advances have been made in the use of adhesives to bind fabrics. However, prior laminates bind natural fibers, such as cotton, together in such a manner as to lock up the fibers, and, this, prevent the laminates from stretching. As a result, such brassieres still require several finishing steps in order to

CA 02490785 2009-08-25 complete the manufacturing of the brassiere. Such finishing steps include the addition of binding materials, such as elastic, to provide support, stretch, and a finished edge.

[0004] Given the foregoing, there is a need for methods of making brassieres made of a material that is soft and supple, yet is capable of providing shape and control to support the breasts of the wearer, without seams or elastic.

SUMMARY OF THE INVENTION

[0005] It is an object of the present invention to provide a method of forming a cotton blend brassiere from a multi-layered fabric laminate.

[0006] It is still another object of the present invention to provide such a method where the brassiere has a finished edge that does not require separate binding or narrow edge finishing.

[0007] These and other objects and advantages of the present invention are achieved by a method of forming an undergarment.

The method includes inserting an adhesive layer between a first fabric layer and a second fabric layer to form a fabric subassembly. The sub-assembly has a periphery that is larger than an entire outer periphery of the undergarment. The method further includes causing the adhesive layer to form a laminate from the sub-assembly and removing a trim from the laminate at the entire outer periphery to form a finished edge of the undergarment. Preferably, the first and second fabric layers include at least one cotton material.

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[0008] These and other objects and advantages of the present invention are also achieved by a method including applying an adhesive layer to a first fabric layer; overlying the adhesive layer with a second fabric layer; causing the adhesive layer to bond the first and second fabric layers together to form a stretchable laminate; and cutting the stretchable laminate along the entire outer periphery to form a finished edge of the undergarment that resists unraveling. The stretchable laminate has a periphery that is larger than an entire outer periphery of the undergarment. Preferably, the first fabric layer is a first cotton blend fabric and the second fabric layer is a second cotton blend fabric.

[0009] Still further, these and other objects and advantages of the present invention are achieved by a method including forming an adhesive layer having an adhesive-free portion; surrounding the adhesive layer with a first fabric layer and a second fabric layer; causing the adhesive layer to bond the first and second fabric layers together to form a stretchable laminate having a periphery that is larger than an entire outer periphery of the undergarment; and cutting the stretchable laminate along the entire outer periphery to form a finished edge of the undergarment that resists unraveling. The adhesive layer is a layer of thermally actuated polyethylene and ethylene vinyl acetate copolymer. The stretchable laminate has a periphery that is larger than an entire outer periphery of the undergarment.

[0010] The above-described and other features and advantages of the present invention will be appreciated and understood by those skilled in the art from the following detailed description, drawings, and appended claims.

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BRIEF DESCRIPTION OF THE DRAWINGS

[0011] FIG. 1 is a top plan view of an exemplary embodiment of a brassiere according to the present invention;

[0012] FIG. 2 is an exploded sectional view taken along line 2-2 of FIG. 1; and

[0013] FIGS. 3-4 schematically illustrate a method according to the present invention of forming the brassiere of FIG. 1.

DETAILED DESCRIPTION OF THE INVENTION

[0014] Referring to the drawings, and, in particular, FIG. 1, there is provided a brassiere according to the present invention, generally represented by reference numeral 10. Brassiere 10 includes a pair of breast cups 12 that can be readily molded into a three dimensional cup shape, a central portion 14 extending between the breast cups; a bottom portion 16 that can lie flat against the chest wall of a wearer beneath the cups; and a pair of side panels 18 that extend from the breast cups 12 and provide a body circling arrangement. Preferably, brassiere 10 has a pair of shoulder straps 20 and a set interconnecting clasps 22.

[0015] Brassiere 10 can preferably have a pair of underwire channels 24 provided therein to receive a pair of underwires 26. Each underwire 26 is preferably an arcuate, U-shaped member.

Each channel 24 is typically stitched to brassiere 10. However, each channel 24 may be glued or ultrasonically welded to

Each channel 24 may be made from cotton, polyester brassiere 10 or spandex.

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[0016] Brassiere 10 can also include a central gore 28 to reinforce central portion 14 and provide additional separation between breast cups 12. Preferably, central gore 28 is made from a non-stretchable material, such as cotton, polyester or nylon. More preferably, central gore 28 is made from 100 percent cotton.

[0017] Further, brassiere 10 includes a finished edge 30 defined about the periphery of the brassiere. Finished edge 30 can be a straight edge, a scalloped edge, and any combination of the foregoing. Preferably, finished edge 30 has a decorative pattern such as the scalloped pattern illustrated in FIG. 1.

[0018] Brassiere 10 is, preferably, a fabric laminate of two or more layers as illustrated in FIG. 2. Thus, brassiere 10 has a first layer 32 and a second layer 34 adhered to one another by an adhesive layer 36. First and second layers 32, 34 each have a inner surface 38 and an outer surface 40. Depending upon the construction of the brassiere, adhesive layer 36 may be applied to cover inner surface 38 of first and second layers 32, 34 entirely or only over selected portions of the inner surfaces.

[0019] For example, it is contemplated by the present invention for adhesive layer 36 to cover only selected regions of inner surfaces 38 so that an adhesive free region 42 of the adhesive layer is defined. Adhesive free region 42 is illustrated in phantom in FIG. 3 and, thus, can form a non-bonded region (not shown) between first and second layers 32, 34. Preferably, adhesive free region 42 is defined at breast cups 12 so that first and second layers 32, 34 have the non-bonded region in the breast cups 12.

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[0020] First layer 32 and second layer 34 are made from natural fibers or blend of natural and synthetic fibers. Preferably, first layer 32 and second layer 34 are made of a blend of cotton, polyester and spandex. More preferably, first layer 32 and second layer 34 are made of a blend having approximately 44% to 50% cotton, approximately 44% to 50% polyester and approximately 3% to 9% spandex. Even more preferably, first layer 32 and second layer 34 are made of a blend having 47% cotton, 47% polyester and 6% spandex.

[0021] Adhesive layer 36 is a thermoplastic adhesive.

Preferably, adhesive layer 36 is a thermally actuated polyethylene and ethylene vinyl acetate copolymer. More preferably, adhesive layer 36 is a thermally actuated polyethylene and ethylene vinyl acetate copolymer that is sold under the trade name Delnet® EP by Delstar Technologies, Inc. Delnet® EP is made from high density polyethylene (HDPE) with an EVA skin layer on both sides to enable easier bonding. Adhesive layer 36 has a base weight of approximately 0.45 oz/yd²; a thickness of approximately 5.5 mils; a material direction (MD) boss count of approximately 24 per inch; a course direction (CD) boss count of approximately 25 per inch; a porosity of approximately 1000 cfm/ft²; an MD tensile strength of approximately 2.4 lbs/in; a CD tensile strength of approximately 4.0 lbs/in; a skin soft point of approximately 110 degrees Celsius; and a processing range of greater than 123 degrees Celsius .

[0022] It has been found that Delnet® is the preferred adhesive for use in adhesive layer 36 as it does not lock up

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PCT/US2003/020643 the cotton fibers in first layer 32 and second layer 34, thus allowing the first and second layers to maintain stretchability. Specifically, it has been found that adhesive layer 36 including a net of adhesive strands of yarn (not shown) that cross over each other in a configuration that resembles a diamond shape allows brassiere 10 to maintain its stretch. The diamond can be further identified with dots (not shown) interconnecting the strands. It is believed that when adhesive layer 36 is activated, the corners of the diamond or strands draws back to the crossover dots, which secure first layer 32 to second layer 34. It is also believed that this pulling back of the strands to the dots facilitates first and second layers 32, 34 maintaining their stretch.

[0023] A method 50 of forming brassiere 10 having fabric layers 32, 34 and adhesive layer 36 is shown in FIGS. 3 and 4. Method 50 includes a first or cutting step 52, a second or assembly step 54, a third or activation step 56, and a fourth or trimming step 58.

[0024] In the first step 52, first and second fabric layers 32, 34, as well as adhesive layer 36 are cut to a shape 60 that generally follows and approximates the outline of brassiere 10. Shape 60 is slightly larger than finished edge 30 to be defined about the periphery of brassiere 10 so that a selvage or trim 62 remains in the shape for later removal during manufacture.

[0025] The individual pieces of brassiere 10 are assembled in second step 54. Specifically, first layer 36 is positioned atop second layer 34, then first layer 32 is positioned atop adhesive layer 36 to form a sub-assembly 64.

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[0026] Adhesive layer 36 is activated at third step 56 to cause sub-assembly 64 to form a laminate 66. For example, third step 56 can be heat treatment step in which adhesive layer 36 is thermally actuated causing first and second layers 32, 34 to adhere to one another and form laminate 66.

[0027] Trim 62 is removed from laminate 66 at fourth step 58 to provide finished edge 30 and, thus, to complete brassiere 10.

For example, fourth step 58 can reciprocate a die and press into one another to die cut trim 62 from laminate 66. At this stage, brassiere 10 is fully glued around the perimeter of the garment (e.g., edge 30) and, thus, does not require any additional finishing step to prevent the edge from unraveling. In addition, edge 30 can include the decorative pattern that enhances the aesthetic appeal of brassiere 10 as well allows the brassiere to better engage the body of the wearer. Typically, shoulder straps 20 and interconnecting clasps 22 are attached to brassiere 10 after removal of trim 62.

[0028] In some embodiments of the present invention, method 50 can include a fifth or molding step 68. In fifth step 68, laminate 66 can be introduced to a molding machine 70 for molding breast cup portions 12 into the laminate to give the cups a predetermined shape .

[0029] In other embodiments of the present invention, method can include a sixth or underwire insertion step 72. During second step 54, channels 24 and gore 28 are assembled into subassembly 64. For example, channels 24 are typically stitched to inner surface 40 of second layer 34, but alternatively may be

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PCT/US2003/020643 glued or ultrasonically welded to the inner surface. Central gore 28 is then positioned between channels 24. Thus, laminate 66 presented to sixth step 72 includes channels 24 having open ends 74. Sixth step 72 inserts each underwire 26 into each channel 24 through its open end 74. Sixth step 72 then closes open ends 74 by stitching, gluing, or ultrasonic welding.

[0030] It should be recognized that sixth step 72 is illustrated by way of example inserting underwires 26 after subassembly 64 is exposed to third step 56 to form laminate 66. However, it is contemplated by the present disclosure for sixth step 72 to be prior to third step 56 so that the third step not only forms laminate 66, but also closes open ends 74.

[0031] Brassieres constructed from fabric laminates made according to the present invention are highly resistant to unraveling due to the polyethylene and ethylene vinyl acetate copolymer used as an adhesive. This adhesive permits the use of natural fibers, such as cotton, in manufacturing the brassiere as this particular adhesive does not lock up the cotton fibers and allows the material to maintain a degree of stretchability. Because of the construction of the fabric laminate, brassieres made from this fabric laminate do not require seams thus giving them an aesthetically pleasing seamless appearance. In addition, such brassieres are easier and less expensive to manufacture as construction involves a minimum of labor intensive assembly steps .

[0032] It should be recognized that method 50 is illustrated by way of example as forming brassiere 10. Of course, it is contemplated by the present invention for method 50 to find equal

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PCT/US2003/020643 use in the manufacture of other undergarments.

[0033] While the present invention has been described with reference to one or more exemplary embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the present invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the disclosure without departing from the scope thereof. Therefore, it is intended that the present invention not be limited to the particular embodiment(s) disclosed as the best mode contemplated for carrying out this invention, but that the invention will include all embodiments falling within the scope of the appended claims.