shorts

Abstract

To provide shorts having both flexibility and waterproofness in a gusset part, and further having cut edges of the gusset part that do not fray even after many washings, so that the gusset part can maintain its original appearance for a long period of time. [Solution] Shorts A are composed of a shorts body 1, a gusset cloth 10, and an adhesive layer 20 that bonds the two together. The adhesive layer 20 is composed of an inner adhesive layer 25 that is provided in a dotted or zigzag pattern along the cut edge 11 of the gusset cloth 10 at a predetermined distance W inward from the cut edge 11, and an outer adhesive layer 28 that is provided all around the area between the cut edge 11 and the inner adhesive layer 25 around the entire circumference of the gusset cloth 10. The entire circumference of the outer edge 21 of the outer adhesive layer 28 is aligned with the entire circumference of the cut edge 11 of the gusset cloth 10.

Description

[Technical Field]

[0001] This invention relates to shorts with an adhesive structure that prevents fraying at the cut edges of the gusset fabric. [Background technology]

[0002] Traditionally, underwear has been manufactured by sewing the connections and overlapping parts of its components. However, the seams are visible on the surface of the fabric, and when underwear has many parts that directly touch the skin, they can rub against the skin and cause a tingling or itchy feeling. For this reason, people with sensitive skin tend to avoid sewn underwear. Also, when wearing a thin outer layer, the seams can be visible on the outer layer, so recently, consumers have tended to prefer seamless underwear that is glued instead of sewn. In addition, sewing requires raw edge processing to prevent fraying, which is time-consuming, increases manufacturing costs, and places many restrictions on design.

[0003] In the case of seamless shorts, a gusset cloth cut to a predetermined shape is overlapped on the crotch portion of the main body portion, and then the gusset cloth is heat-pressed with a dot pattern hot melt adhesive applied to the adhesive area, and then the side portions of the front and back body portions of the main body portion are bonded together (Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] WO2020 / 245955 publication Summary of the Invention [Problem to be solved by the invention]

[0005] For the gusset cloth, pure cotton or cotton blend woven or knitted fabric is used from the viewpoints of feel and moisture absorption. And for the reason mentioned above (no stitching), the outer periphery of the gusset cloth is left uncut. The dotted hot melt adhesive is applied in multiple rows to the adhesive area of ​​a predetermined width on the outer periphery of the gusset cloth using a dispenser, but due to the structure of the device, even the dots of adhesive closest to the outer edge of the gusset cloth are applied at a position slightly away from the outer edge of the gusset cloth, resulting in the threads located on the outer edge, which is the cut edge of the gusset cloth, not being fixed with the adhesive. In addition, the spaces between the dots are free, so the ends of the threads that make up the gusset fabric are not constrained in these areas. As a result, as the number of times the shorts are washed increases, the cut edges of the gusset fabric gradually begin to fray, damaging the appearance of the shorts.

[0006] Furthermore, in the case of dot adhesion, as described above, there is no adhesive layer between the dots, so when the gusset portion is stretched, the spaces between the dots where there is no adhesive layer stretch, which has the advantage that the flexibility of the gusset portion is not impaired.However, on the other hand, there is also the problem that if urine leaks, the urine will seep in between the dots and leak to the outside.

[0007] To provide shorts having both flexibility and waterproofness in the gusset portion, and in which the cut edges of the gusset portion do not fray even after multiple washings, and the gusset portion can maintain its original appearance for a long period of time. [Means for solving the problem]

[0008] In order to solve the above problem, claim 1 is as follows: A shorts body 1 is composed of a front body 2 and a back body 3 connected by a crotch portion 4; A gusset cloth 10 formed by cutting a woven or knitted fabric into a predetermined shape and having cut edges 11 left uncut; In the shorts A, which are composed of an adhesive layer 20 that adheres the gusset cloth 10 to the inner surface of the crotch portion 4, The adhesive layer 20 is composed of an inner adhesive layer 25 provided in a dotted or zigzag line pattern along the cut edge 11 of the gusset cloth 10 at a predetermined interval W from the cut edge 11 toward the inside, and an outer adhesive layer 28 provided over the entire area between the cut edge 11 and the inner adhesive layer 25 around the entire periphery of the gusset cloth 10, The outer peripheral edge 21 of the outer adhesive layer 28 is provided so as to coincide with the cut edge 11 of the gusset cloth 10 over its entire periphery.

[0009] Claim 2 provides the shorts A according to claim 1, The outer adhesive layer 28 is made of a double-sided adhesive sheet S attached to the gusset fabric 10a, and the outer adhesive layer 28 is formed by punching out the double-sided adhesive sheet S together with the gusset fabric 10a.

[0010] Claim 3 is characterized in that in the shorts A according to claim 1, the gusset cloth 10 is made of pure cotton or mixed cotton.

[0011] Claim 4 is characterized in that in the shorts A according to claim 1, the shorts body 1 is made of a free-cut fabric. [Effects of the Invention]

[0012] Because the present device is configured as described above, the outer edge 21 of the outer adhesive layer 28 extends to the cut edge 11 of the gusset cloth 10. As a result, the cut edge 11 of the gusset cloth 10 does not fray. Moreover, because the outer adhesive layer 28 is provided around the entire periphery of the gusset cloth 10, moisture absorbed by the gusset cloth 10 does not leak out. In addition, the adhesive layer 20 that bonds the gusset cloth 10 to the crotch portion 4 has a double structure consisting of the inner adhesive layer 25 and the outer adhesive layer 28. This allows the width of the outer adhesive layer 28 to be narrowed, and in combination with the inner adhesive layer 25 provided in a dotted or zigzag line pattern, this allows the adhesive layer 20 to maintain its stretchability and achieve flexibility. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a front view of shorts having an adhesive structure according to the present invention. [Figure 2] 2A is a development view of the shorts shown in FIG. 1, FIG. 2B is an enlarged plan view of the adhesive portion of the gusset portion, and FIG. 2C is an enlarged cross-sectional view of the adhesive portion of the gusset portion. [Figure 3](A) is a plan view of a double-sided adhesive sheet for a gusset with punched holes made using a die that is slightly smaller than the gusset cloth, (B) is a plan view of the punched sheet attached to the gusset fabric, (C) is a partially enlarged cross-sectional view of the gusset cloth being punched out of the gusset fabric with the punched sheet attached, (D) is a plan view of the punched gusset cloth before dots of adhesive are applied, (E) is a plan view of the punched gusset cloth after dots of adhesive are applied, (E1) is an enlarged plan view of the adhesive part of the gusset cloth, (E2) is a cross-sectional view of the previous figure, and (E3) is a partially enlarged plan view of the punched gusset cloth after adhesive has been applied in zigzag lines. DETAILED DESCRIPTION OF THE INVENTION

[0014] The shorts A according to an embodiment of the present invention will be described below. The shorts A according to the present invention are composed of a shorts body 1 and a gusset cloth 10 as constituent parts.

[0015] The shorts body 1 of this embodiment is made from a single piece of fabric consisting of a front body 2 that covers the lower abdomen, a back body 3 that covers the buttocks, and a crotch section 4 that connects the front body 2 and the back body 3 together. The fabric of the shorts body 1 is made of a stretchable fabric knitted or woven using elastic yarns such as stretchable nylon or polyurethane fibers, or heat-melting spandex yarns (special spandex that bonds with other fibers it crosses when heat is applied). Such fabrics are called free-cut fabrics, and are specially processed to prevent the cut edges from fraying when cut, such as by presetting and / or heat-setting, which stabilizes the cut edges and prevents fraying.

[0016] A gusset cloth 10 is attached to the inner surface of the crotch portion 4 of the shorts A. After attaching this gusset cloth 10, the left and right side edges 2a and 2b of the front body 2 and the back body 3 are bonded together to complete the shorts A. The fabric used for the front body 2 and back body 3 of shorts A is used so that the horizontal stretch is greater than the vertical stretch, as shown by the arrows.

[0017] Next, the manufacturing procedure for the gusset cloth 10 using the double-sided adhesive sheet S used in the present invention and the procedure for adhering it to the shorts body 1 will be described (FIG. 3). Step 1: A rectangular double-sided adhesive sheet S is punched out with a cutting blade (or a laser beam) having a width of about 1 to 3 mm and a similar shape but slightly smaller than the outer shape of the gusset cloth 10. A hole H having a similar shape but slightly smaller than the outer shape of the gusset cloth 10 is formed in the double-sided adhesive sheet S. The outer shape of the gusset cloth 10 is indicated by a dashed line and is designated by the symbol 10' (Fig. 3(A)).

[0018] Step 2: The double-sided adhesive sheet S with the similarly shaped holes H punched is attached to the rectangular gusset fabric 10a (for example, a woven or knitted fabric made of pure cotton or a cotton blend). Release paper 30 is attached to the non-adhesive surface (top surface) of the double-sided adhesive sheet S. As a result, the double-sided adhesive sheet S with the similarly shaped punched holes H, which are slightly smaller than the outer shape 10' of the gusset cloth 10, is attached to the gusset fabric 10a (FIG. 3(B)).

[0019] Step 3: The gusset fabric 10a to which the double-sided adhesive sheet S has been attached is punched around the punched holes H using a punching blade (or laser beam) aligned with the outer shape 10' of the gusset cloth 10. The punched-out gusset fabric 10a and the cut edges of the double-sided adhesive sheet S are indicated by the reference numerals 11 and 21, respectively (FIG. 3(C)). As a result, the double-sided adhesive sheet S in tape form is adhered to the entire periphery of the cut edge 11, which is the outer peripheral edge of the punched-out gusset fabric 10a, with a width of approximately 1 to 3 mm. This punching results in the outer peripheral edge, which is the cut edge 11 of the gusset fabric 10a, and the outer peripheral edge, which is the cut edge 21 of the double-sided adhesive sheet S in tape form, being completely aligned and adhered all around. This tape-like double-sided adhesive sheet S is referred to as the outer adhesive layer 28. The cut edge 11 of the punched gusset fabric 10a is left uncut, but the outer peripheral edge which is the cut edge 21 of the double-sided adhesive sheet S reaches the outer peripheral edge of the cut edge 11 of the gusset fabric 10a, so that the threads located at the cut edge 11 of the gusset fabric 10a are caught by the double-sided adhesive sheet S and do not fray.

[0020] Step 4: The release paper 30 is removed from the double-sided adhesive sheet S (outer adhesive layer 28) that has been formed into a tape and attached to the gusset fabric 10a (FIG. 3(D)).

[0021] Step 5: On the inside of the tape-like double-sided adhesive sheet S (i.e., on the similar-shaped holes H), adhesive is applied in dots or zigzag lines of a predetermined width to the gusset fabric 10a using a liquid discharge device such as a dispenser (Fig. 3(E)). This portion is called the inner adhesive layer 25. This completes the gusset fabric 10.

[0022] The adhesive used for the inner adhesive layer 25 is, for example, a hot melt adhesive. Examples of hot melt adhesives include polyamide-based hot melt adhesives and polyurethane-based hot melt adhesives. The hot melt adhesive has a lower melting temperature than the double-sided adhesive sheet S, and is dispensed in a molten state in the form of dots (FIGS. 3(E1), E2) or zigzag lines (FIG. 3(E3)). When cooled and solidified, it forms dots or zigzag lines. The dot-shaped or zigzag line-shaped coated portions are the inner adhesive layer 25. The width of the inner adhesive layer 25 is 4 to 6 mm.

[0023] The dot-shaped or zigzag linear inner adhesive layer 25 is formed along and inside the lines of similarly shaped holes H formed in the thin, tape-like double-sided adhesive sheet S, which has been punched into a loop. In the illustrated embodiment, there are three rows of dot-shaped inner adhesive layers 25, and one zigzag linear inner adhesive layer 25. The width of the inner adhesive layer 25 is 4 to 6 mm. The dot pattern has a particle size of, for example, 1 to 2 mm, and the dots are spaced apart by a gap of, for example, 1 to 1.5 mm. The zigzag linear inner adhesive layer 25 is formed by applying, for example, a hot melt adhesive in a zigzag pattern with a pitch of 2 to 3 mm.

[0024] The adhesive application pattern can be formed by applying the adhesive with a dispenser, or by attaching an adhesive-coated sheet (not shown) to the fabric and transferring the adhesive to the fabric. The adhesive application patterns described above are merely examples, and the application patterns are not limited to these as long as they do not impede the stretchability of the gusset fabric 10a. Also, in the above explanation, the release paper 30 is peeled off before the application of the inner adhesive layer 25, but it may be peeled off after the application of the inner adhesive layer 25. Therefore, steps 4 and 5 can be reversed.

[0025] Furthermore, in the above-described gusset cloth forming procedure, the double-sided adhesive sheet S and hot melt adhesive are used, but the present invention is not limited to this, and screen printing can also be used. Although the screen printing process is not shown, screen printing is performed by solidifying with emulsion the areas not required for printing, other than the inner adhesive layer, the outer adhesive layer, and the portions extending outward from the outer adhesive layer, to form a non-adhesive layer, and then placing molten liquid hot melt adhesive on this screen and rubbing it with a squeegee to transfer the hot melt adhesive to the inner adhesive layer, the outer adhesive layer, and the portions extending outward from the outer adhesive layer. The cutting is performed at the boundary between the outer adhesive layer and its outer peripheral portion. That is, even in the case of screen printing, the cutting is performed at the position indicated by the dashed line (the boundary between the outer adhesive layer and its outer peripheral portion) in the adhesive application area applied by the screen printing. Therefore, even in the case of screen printing, the outer peripheral edge, which is the cut edge of the gusset fabric, and the outer peripheral edge, which is the cut edge of the adhesive application area in the screen printing, will completely coincide all around.

[0026] Step 6: The gusset cloth 10 with the adhesive layer 20 (a concept including both the inner adhesive layer 25 and the outer adhesive layer 28) is set in a predetermined position on the inner surface of the crotch portion 4 of the shorts body 1, and is then heat-pressed at a temperature of, for example, 170° C. This heat-pressing causes an irreversible cross-linking reaction in the adhesive layer 20, firmly bonding the crotch portion 4 and the gusset cloth 10 together. Since the outer adhesive layer 28 is attached up to the cut edge 11 of the gusset fabric 10a, the threads located at the cut edge 11 of the gusset fabric 10a are also securely caught by the outer adhesive layer 28. Thereafter, the left and right side edges 2a and 2b of the front body 2 and the back body 3 are bonded together to complete the shorts A.

[0027] In the finished shorts A, the hot melt adhesive as the inner adhesive layer 25 and the double-sided adhesive sheet S as the outer adhesive layer 28 in the adhesive region are hardened, and the gusset cloth 10 does not peel off from the inner surface of the crotch portion 4 of the shorts body 1. In addition, as described above, the outer adhesive layer 28 is attached up to the cut edge 11 of the gusset cloth fabric 10a, and the threads located at the cut edge 11 of the gusset cloth fabric 10a are also caught by the outer adhesive layer 28, so that the cut edge 11 of the gusset cloth fabric 10a will not fray even after repeated washing. [Explanation of symbols]

[0028] A: Shorts, H: Similar hole, S: Double-sided adhesive sheet, W: Spacing, 1: Shorts body, 2: Front body, 2a·2b: Side edges, 3: Back body, 4: Crotch, 10: Gusset cloth, 10': Outer shape of gusset cloth, 10a: Fabric for gusset cloth, 11: Cut edge (outer edge), 20: Adhesive layer, 21: Cut edge (outer edge), 25: Inner adhesive layer, 28: Outer adhesive layer, 30: Release paper

Claims

1. A shorts body 1 is composed of a front body 2 and a back body 3 connected by a crotch portion 4; a gusset cloth 10 formed by cutting a woven or knitted fabric into a predetermined shape, with the cut edges 11 left cut and bonded to the inner surface of the crotch portion 4; In the shorts A, which are constituted by an adhesive layer 20 that bonds the crotch portion 4 and the gusset cloth 10, The adhesive layer 20 is composed of an inner adhesive layer 25 provided in a dotted or zigzag line pattern along the cut edge 11 of the gusset cloth 10 at a predetermined interval W from the cut edge 11 toward the inside, and an outer adhesive layer 28 provided over the entire area between the cut edge 11 and the inner adhesive layer 25 around the entire periphery of the gusset cloth 10, The shorts are characterized in that the entire circumference of the outer edge 21 of the outer adhesive layer 28 is provided so as to coincide with the entire circumference of the cut edge 11 of the gusset cloth 10.

2. The shorts according to claim 1, characterized in that the outer adhesive layer (28) is made of a double-sided adhesive sheet (S) attached to the gusset fabric (10a), and the outer adhesive layer (28) is made by punching out the double-sided adhesive sheet (S) together with the gusset fabric (10a).

3. 2. The shorts according to claim 1, wherein the gusset cloth 10 is made of pure cotton or a blended cotton.

4. 2. The shorts according to claim 1, wherein the shorts body 1 is made of a free-cut fabric.

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