Swimsuit

Abstract

To provide a swimming suit having low frictional resistance in water.SOLUTION: This swimming suit 1 is composed of a stretchable warp knitted fabric containing an elastic yarn and a non-elastic yarn, and contains a stripe pattern continuing in one direction in at least a part, wherein the stripe pattern contains a concave stripe part 2 and a convex stripe part 3, and the stripe pattern partially contains a warp knitted fabric formed by a herringbone texture. The herringbone structure preferably has at least two courses in which the surface is the sinker surface of the knitted fabric and the direction of the non-elastic yarn is the same direction. The difference in height between the concave stripe portion and the convex stripe portion is preferably 50 to 500 μm on average, and the pitch between the convex stripe portion and the adjacent convex stripe portion is preferably 300 to 1500 μm on average. It is preferable that at least a part of the swimsuit fabric is water-repellent finished.SELECTED DRAWING: Figure 1A

Description

[Technical Field]

[0001] The present invention relates to swimwear. [Background technology]

[0002] Good stretchability is desirable for sportswear and swimwear. Additionally, one of the functions required for swimwear and caps is to reduce the surface friction resistance of the swimwear in water during competitive swimming. Various stretch fabrics have been proposed. Patent Document 1 proposes providing a hydrophilic area by printing, and then immersing the entire fabric in a water-repellent agent to reduce fluid resistance. The applicants also proposed a swimwear in Patent Document 2 in which water-repellent and non-water-repellent areas are arranged in stripes along the body length. Patent Document 3 proposes arranging a plain weave section and a double weave section continuously, and Patent Document 4 proposes forming a striped pattern by embossing. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-332137 [Patent Document 2] Japanese Patent Application Laid-Open No. 2006-348398 [Patent Document 3] International Publication No. 2015-151820 [Patent Document 5] Japanese Patent Application Laid-Open No. 2017-002417 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the conventional swimwear has a problem of high friction resistance in water.

[0005] SUMMARY OF THE INVENTION In order to solve the above-mentioned problems of the prior art, the present invention provides a swimsuit with low friction resistance in water. [Means for solving the problem]

[0006] One embodiment of the present invention relates to a swimsuit made of a warp knit fabric that contains elastic yarns and inelastic yarns and has stretchability, and at least a portion of the swimsuit includes a striped pattern that continues in one direction, the striped pattern including recessed stripes and raised stripes, and the striped pattern includes a portion of the warp knit fabric formed in a herringbone weave. [Effects of the Invention]

[0007] The swimsuit of the present invention is a swimsuit made of warp knitted fabric containing elastic yarns and inelastic yarns and having stretchability, and at least a portion of the swimsuit includes a striped pattern that continues in one direction, the striped pattern including recessed stripes and raised stripes, and the striped pattern includes a portion of warp knitted fabric formed in a herringbone weave, thereby providing a swimsuit with low frictional resistance in water. [Brief explanation of the drawings]

[0008] [Figure 1A] FIG. 1A is a plan view photograph (80x magnification) of a swimsuit fabric according to one embodiment of the present invention. [Figure 1B] FIG. 1B is a cross-sectional photograph (magnification 80 times) taken along line II in FIG. 1A. [Figure 2] FIG. 2 is a schematic explanatory diagram showing the arrangement of inelastic yarns in a plan view photograph (magnification: 5 times) of a swimsuit fabric according to one embodiment of the present invention. [Figure 3] FIG. 3 is a knitting diagram of a swimsuit fabric according to one embodiment of the present invention. [Figure 4] FIG. 4 is a knitting diagram of a swimsuit fabric according to another embodiment of the present invention. [Figure 5] FIG. 5 is a schematic explanatory diagram of an apparatus for measuring fluid resistance of a swimsuit fabric according to one embodiment of the present invention. [Figure 6] FIG. 6A is a schematic plan view of an airfoil model used in the fluid resistance measuring device, and FIG. 6B is a schematic side view of the same. [Figure 7] FIG. 7 is a schematic front view of a swimsuit according to one embodiment of the present invention. [Figure 8]FIG. 8 is a schematic rear view of the swimsuit. DETAILED DESCRIPTION OF THE INVENTION

[0009] The present invention relates to a swimsuit made of a warp knit fabric having elasticity and including elastic yarns and non-elastic yarns. An example of the elastic yarn is a polyurethane-based elastic yarn. The non-elastic yarn is preferably a polyester fiber yarn such as polyethylene terephthalate, or a nylon fiber yarn such as nylon 6 or nylon 66. Both the elastic yarn and the non-elastic yarn are preferably filament yarns.

[0010] The swimsuit fabric includes a stripe pattern that continues in at least one direction in at least a portion of the fabric, the stripe pattern including concave stripes and convex stripes, and the stripe pattern is formed by a V-shaped pattern in a herringbone weave. Not only does it simply form a concave-convex structure, but the inclusion of the herringbone pattern reduces frictional resistance in water. Furthermore, since the concave-convex stripes are knitted, it is possible to form concave stripes and convex stripes with a fine pitch. Reducing the pitch from convex to convex in the concave-convex stripes reduces frictional resistance in water, but it is difficult to achieve a smaller concave-convex structure with conventional embossing technology, and it is even more difficult to form a herringbone pattern in such a small concave-convex structure.

[0011] The herringbone weave is not particularly limited as long as it has a V-shaped pattern formed by combining right and left twill stitches directly or at intervals. Examples of weaves include atlas knitting. The surface is the sinker surface of the knitted fabric, and it is preferable that there are at least two courses in which the direction of the inelastic yarn is the same. This allows the uneven structure of the herringbone weave to be fully exhibited.

[0012] The pitch (rib spacing) between the adjacent protruding stripes is preferably 300 to 1500 μm on average, more preferably 330 to 1200 μm on average, and even more preferably 350 to 1000 μm on average. The width of the recessed stripes is preferably 100 to 300 μm on average, more preferably 110 to 250 μm on average, and even more preferably 120 to 200 μm on average. This allows the formation of recessed stripes and protruding stripes with a fine pitch, thereby reducing water flow resistance.

[0013] The height difference (depth of unevenness) between the recessed stripes and the protruding stripes is preferably 50 to 500 μm on average, more preferably 80 to 400 μm on average, and even more preferably 100 to 350 μm on average, which allows the formation of recessed stripes and protruding stripes with a fine pitch, thereby reducing water flow resistance.

[0014] The non-elastic yarn of the swimsuit fabric is preferably a stretchable knitted fabric in which synthetic multifilament yarn is interwoven with polyurethane (spandex) fiber yarn as the elastic yarn.

[0015] It is preferable that the entire surface of the swimsuit fabric is provided with a water repellent. Any water repellent agent may be used for the water repellent treatment, such as a fluorine-based, silicone-based, or paraffin-based agent, but in view of the market environment in which fluorine-free agents are desired, it is more preferable to use a non-fluorine-based water repellent agent, such as a paraffin-based, a hydrocarbon-based (e.g., acrylic) or a silicone-based agent, either alone or in combination. In order to improve the durability of the water repellency, it is preferable to use a crosslinking agent in combination with the water repellent agent. As the crosslinking agent, at least one of melamine-based resins, blocked isocyanate-based compounds, glyoxal-based resins, and imine-based resins can be used, and the crosslinking agent is not particularly limited.

[0016] The fabric for the swimsuit has an elongation rate of preferably 60 to 180%, more preferably 70 to 170%, and even more preferably 80 to 160%, in both the warp and weft directions as measured by JIS L1096 (2010) Method A cut strip method (load of 17.7 N (1.8 kg), width of 5 cm). This improves the wearing comfort of the swimsuit and makes it easier to put on and take off.

[0017] The thickness of the swimsuit fabric is preferably 0.8 mm or less, more preferably 0.7 mm or less, and even more preferably 0.6 mm or less. This allows for a thin swimsuit with low resistance in water. When sewing the swimsuit into a swimsuit, a lining is added to a portion of the swimsuit, such as the crotch area, and it is preferable that the combined thickness of the swimsuit fabric (outer fabric) and lining be 0.8 mm or less.

[0018] The method for manufacturing swimsuit fabric of the present invention involves knitting a warp knitted fabric using a warp knitting machine with two or more reeds. In this process, non-elastic yarn is supplied to the front and middle reeds, and elastic yarn is supplied to the back reed. The middle reed can be made of non-elastic or elastic yarn as required. In this way, a herringbone stripe pattern consisting of recessed stripes and raised stripes is formed using non-elastic yarn.

[0019] The swimsuit of the present invention has a striped pattern formed by a herringbone weave, arranged in the height direction (length direction) of the human body. This reduces water flow resistance. The swimsuit is a competitive swimming swimsuit, and is preferably made with a pattern that is 20% to 40% smaller than the standard human size. This allows it to fit snugly to the human body. The standard human size is, for example, the Japanese standard size set by the Japan Sporting Goods Industry Association (JASPO), and is listed in Tables 1 to 3 below. Table 1 is for men / unisex, Table 2 is for women, and Table 3 is for juniors.

[0020] [Table 1] [Table 2] [Table 3]

[0021] The fineness of the elastic fiber yarn used in the present invention is preferably 22 to 156 dtex. The total fineness of the non-elastic fiber yarn is preferably 20 to 100 dtex, and the single fiber fineness is preferably 0.1 to 3 dtex or less. The mass per unit area of ​​the fabric (basis weight) is preferably 200 to 300 g / m from the viewpoint of lightness. 2 is preferable, and more preferably 210 to 290 g / m 2 and more preferably 220 to 290 g / m 2 The elastic fiber yarn used is a spandex yarn, such as "Leuca" from Asahi Kasei Fibers Corporation or "Lycra" from Toray Opelontex Co., Ltd. Since the stress varies depending on the type of spandex fiber, it is preferable to select an appropriate type depending on the area of ​​use. However, in the case of swimsuits, which are intended for use in pools, it is preferable to use spandex fibers with excellent chlorine resistance, such as "Leuca SP," "Lycra-176B," "Lycra-176E," "Lycra-254B," or "Lycra-909B."

[0022] The fabric preferably has an elongation of 60 to 180%, more preferably 70 to 170%, and even more preferably 80 to 160%, in both the warp and weft directions as measured by JIS L1096 (2010) Method A cut strip method (load of 17.7 N (1.8 kg), width of 5 cm). Stretchability within the above ranges provides appropriate stretch and ease of wear, making it suitable for sportswear including swimwear.

[0023] The following description will be given with reference to the drawings, in which the same reference numerals denote the same parts. Figure 1A is a plan photograph (magnification 80x) of a swimsuit fabric according to one embodiment of the present invention, and Figure 1B is a cross-sectional photograph (magnification 80x) taken along line II of Figure 1A. This swimsuit fabric 1 has concave stripe sections 2 and convex stripe sections 3 that are continuous in one direction and are arranged alternately, forming an overall herringbone weave. The pitch 4 between convex stripe sections 3a and adjacent convex stripe sections 3b in Figure 1B is preferably 300 to 1500 µm, depending on the yarn used. The height difference between the concave stripe sections 2 and the convex stripe sections 3 is preferably 50 to 500 µm, depending on the yarn used.

[0024] Figure 2 is a schematic explanatory diagram showing the movement of the inelastic yarn 6 in a plan view photograph (magnification 5x) of a swimsuit fabric according to one embodiment of the present invention. Such movement of the inelastic yarn 6 can be achieved by using a half tricot warp knitted fabric. When knitting the fabric, the recessed stripes and raised stripes are arranged horizontally as shown in Figure 2, but in swimsuits, the stripes are sewn in the direction of the wearer's height (body length).

[0025] Figure 3 is a knitting diagram of a swimsuit fabric according to one embodiment of the present invention. The numbers 1 to 7 above are the knitting needle numbers, and this is an example of two courses, a and b, in which the direction of the inelastic yarn 6 is the same. 7 is the elastic yarn. Figure 4 is a knitting diagram of a swimsuit fabric according to another embodiment of the present invention, which differs from Figure 3 in that it has three courses a, b, and c in which the direction of the inelastic yarn 7 is the same. Either course can form a herringbone weave. [Example]

[0026] The present invention will be specifically described below with reference to examples, but the present invention is not limited to the following examples. The methods for measuring the respective property values ​​in the examples are as follows. <Pitch between convex stripes and adjacent convex stripes, and height difference between concave stripes and convex stripes> The pitch and height difference of the striped portion of the fabric were measured using a Keyence One-Shot 3D Shape Measuring Instrument (VR-6000) and an analysis application. A photograph of the fabric surface was taken at 80x magnification using the VR-6000, as shown in Figure 1A, and after shape correction using the analysis application, the cross section of the fabric was observed from the horizontal direction relative to the striped pattern, as shown in Figure 1B. At this time, the pitch and height difference values ​​were measured at 10 or more locations based on the definitions below, and the average values ​​were calculated. - Pitch between adjacent raised stripes (rib spacing) The distance between a protruding stripe portion adjacent to a line perpendicular to the stripe portion and the adjacent protruding stripe portion is defined as the pitch (rib distance). Height difference between the concave stripe section and the convex stripe section The distance between the lowest point and the highest point of the irregularities adjacent to the line perpendicular to the stripe portion is defined as the height difference. <Extension rate> Measurements were made in accordance with JIS L1096 (2010) Method A, Cut Strip Method. The test piece was 5 cm wide and the grip spacing was 20 cm. The initial load was a load equivalent to gravity acting on a length of 1 m across the width of the test piece. The tensile speed was 20 cm / min. The elongation rate (%) was measured at a load of 17.7 N (1.8 kg). The elongation rate indicates stretchability. <Friction resistance in water> Figure 5 is a schematic diagram of a fluid resistance measuring device 10 for swimsuit fabric, one embodiment of the present invention. In this water flow resistance measuring device 10, water is poured into a circulating water tank and allowed to flow at a constant flow rate of 0.13 m / s. The direction of the water flow is indicated by arrow 11. An airfoil model 12 is fixed to a support arm extending below a force sensor 14 fixed to a support base, and swimsuit fabric is placed circumferentially over the surface of this airfoil model 12. In this way, the force sensor 14 measures the drag indicated by arrow 13, thereby measuring the frictional resistance in water. Figure 6A is a schematic plan view of the airfoil model used in the fluid resistance measurement device, and Figure 6B is a schematic side view of the same. This airfoil model is an aircraft airfoil model created by the National Advisory Committee for Aeronautics (NACA, now NASA) and is registered as NACA0012. The thick leading edge of the airfoil is designated as the head, and the fabric is attached in such a way that it faces the direction of water flow. The dimensions are 150 mm in length, 17.5 mm in wing width when viewed from the top, and 100 mm in height when viewed from the side. Drag coefficient C D is calculated using the following formula: Drag coefficient C D has no units.

number

[0027] Example 1 1. Thread Use (1) Elastic thread Polyurethane yarn (fineness 44decitex, Toray Opelontex "Lycra" 176E, hereinafter referred to as 44T-176E) Polyurethane thread (fineness 55decitex, Toray Opelontex "Lycra" 254E, hereinafter referred to as 55T-254E). (2) Inelastic yarn Polyethylene terephthalate multifilament raw silk (fineness 56 dtex, number of filaments 36, Toray Industries "Tetoron" E62, hereinafter referred to as 56T-36-E62) 2 Knitting A warp knitted fabric was knitted using a 32-gauge tricot warp knitting machine. A non-elastic yarn was fed to the front reed and an elastic yarn was fed to the back reed. In this way, a herringbone stripe pattern consisting of recessed and raised stripes, as shown in Figures 1 to 3, was formed using the non-elastic yarn. 3. Water-repellent treatment The grey knitted fabric was subjected to the dyeing process of ordinary polyester two-way tricot knitted fabric, namely, relaxation and scouring in a bath at 80°C, drying, heat setting, dyeing with a cationic dye in a bath at 130°C, and drying. The fabric was then immersed in a non-fluorine-containing water-repellent treatment liquid of the following formulation, squeezed to a 60% squeeze rate using a mangle, dried at 130°C for 2 minutes, and then given a final set at 170°C which also served as curing. [Water-repellent treatment liquid formulation] "Neoseed (registered trademark)" NR-158 (manufactured by Nicca Chemical Co., Ltd.): 5.0% by mass "Amidea (registered trademark)" M-3 (DIC Corporation): 0.3% by mass "Catalyst" ACX (DIC): 0.3% by mass Isopropyl alcohol: 1.0% by mass ·Water: 93.5% by mass 4. Sewing swimwear The knitted fabric obtained as described above was sewn into a women's competitive swimsuit as shown in Figures 7 and 8. When sewing, the stripe pattern, which runs continuously in one direction on the swimsuit fabric, was sewn so that it was aligned in the height direction of the swimsuit. The pattern was also sewn to be 30% smaller than the standard size of a human body. As shown in Figures 7 and 8, this swimsuit 20 was sewn so that the stripe pattern 21, consisting of recessed stripes and raised stripes formed by a herringbone weave, was aligned in the height direction (length direction). When this swimsuit was worn, it was confirmed that it had a high elongation recovery rate, low frictional resistance in water, high stretchability, easy to wear, and good adhesion to the skin of the human body, making it suitable for competitive swimming.

[0028] Example 2 The same procedure as in Example 1 was carried out except that the tricot warp knitting machine was set to 36 gauge and the non-elastic yarn was knitted as shown in FIG.

[0029] Example 3 The same procedure as in Example 1 was carried out, except that the polyurethane elastic yarn was changed from 44T-176E to 55T-254E.

[0030] (Comparative Example 1) The same procedure as in Example 1 was carried out, except that the knitted fabric described in Comparative Example 1 of Japanese Patent No. 6012817 was used.

[0031] (Comparative Example 2) The same procedure as in Example 1 was carried out except that the embossed knitted fabric described in Example 1 of Japanese Patent No. 6012817 was used.

[0032] (Comparative Example 3) The elastic yarn was polyurethane yarn (fineness 44 decitex, "Lycra" 176E manufactured by Toray Opelontex, hereinafter referred to as 44T-176E), and the non-elastic yarn was polyethylene terephthalate multifilament raw silk (fineness 56 dtex, number of filaments 24, "Tetoron" E62 manufactured by Toray, hereinafter referred to as 56T-24-FS92). The non-elastic yarn was placed in the front and middle reeds, and the elastic yarn in the back reed. All needles in the middle and back reeds were threaded, and only the front reed had one threaded needle and two non-threaded needles. The same procedure as in Example 1 was repeated, except that a tricot with a concave-convex stripe structure without a herringbone pattern was knitted, as shown in the weave diagram in Figure 4. The above conditions and results are summarized in Table 4.

[0033] [Table 4]

[0034] The results in Table 4 confirm that the swimsuit fabrics of Examples 1 to 3 have higher elongation recovery rates and lower frictional resistance in water compared to the comparative example. This fabric was used to sew competitive swimsuits 20 shown in Figures 7 and 8. This swimsuit 20 was sewn so that stripe pattern 21, consisting of recessed stripes and raised stripes formed by a herringbone weave, was oriented in the height direction (length direction). When this swimsuit was worn, it was confirmed that it had a high elongation recovery rate, low frictional resistance in water, high stretchability, was easy to wear, and adhered well to the skin, making it suitable for competitive swimming. [Explanation of symbols]

[0035] 1 Swimsuit fabric 2 Concave stripe 3, 3a, 3b Convex stripe part 4 Pitch between adjacent raised stripes 5 Height difference between the concave stripe section and the convex stripe section 6. Non-elastic yarn 7 Elastic thread 10 Fluid resistance measuring device 11 Water flow direction 12 Airfoil Models 13 Drag 14 Force sensor 20. Competitive swimwear 21 Striped pattern

Claims

1. A swimsuit made of a warp knitted fabric containing elastic yarns and inelastic yarns and having elasticity, At least a portion of the stripe pattern includes a stripe pattern that is continuous in one direction, and the stripe pattern includes a recessed stripe portion and a raised stripe portion; The swimsuit is characterized in that the striped pattern includes a warp knitted fabric formed by a herringbone weave in part.

2. 2. The swimsuit according to claim 1, wherein the herringbone weave has at least two courses in which the inelastic yarns are oriented in the same direction, the surface of the herringbone weave being a sinker surface of the knitted fabric.

3. 3. The swimsuit according to claim 1, wherein the height difference between the recessed stripes and the raised stripes is 50 to 500 μm on average.

4. 3. The swimsuit according to claim 1, wherein the pitch between the raised stripes and the adjacent raised stripes is 300 to 1500 μm on average.

5. 3. The swimsuit according to claim 1, wherein the non-elastic yarn is a synthetic multifilament yarn, and the elastic yarn is a stretchable knitted fabric interwoven with a spandex fiber yarn.

6. 3. The swimsuit according to claim 1, wherein at least a portion of the swimsuit contains a water repellent agent.

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