JP2008138345A - Fabric and sportswear - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a fabric having a resistance to a fluid such as water lower than that of a fabric obtained by a conventional technology, especially a fabric having a low fluid resistance especially in the all directions of the fabric. <P>SOLUTION: The fabric includes two or more kinds of synthetic fiber multifilaments having different crosssectional shapes and an elastic yarn. The two or more kinds of synthetic fiber multifilaments having different cross-sectional shapes are arranged in the shape of a stripe and have streaky projection parts in a direction perpendicular to a direction for forming the stripe which are subjected to water-repellent finishing. The sportswear uses the fabric at least at a part. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

The present invention relates to fabrics and sportswear, and particularly sports sportswear fields where resistance to water and air is a problem, such as swimsuits for swimming, athletics wear, ski or ski jumping wear, speed skatewear, The present invention relates to a fabric suitable as sports apparel such as cycling wear and sportswear using the same.

In the field of sports clothing for competitions that compete for speed, various approaches have been studied to reduce the resistance of the fabric itself to fluids such as water and air, and to reduce the resistance to fluids by designing clothing and the like.
As a method of reducing the resistance of the fabric itself to water and air, a method of smoothing the surface,
For example, a method of pressing a thermal calendar roll or a hot plate, a method of laminating a film or the like on a fabric used for a swimsuit or the like is known.

Specifically, Patent Document 1 discloses a fabric having a very small standard deviation of surface roughness, in which a metallic thin film layer and resin processing are applied in addition to pressing by a calender roll.
Patent Documents 2 to 7 disclose various resistance-reducing fabrics in which grooves and protrusions are provided in the fabric in a direction parallel to the fluid flow to rectify the fluid flow.

Furthermore, Patent Documents 8 and 9 disclose a method of imparting a combination of water repellency and hydrophilicity to a fabric in order to reduce eddy resistance between the fluid and the fabric.
Further, as a new viewpoint, Patent Document 10 examines a difference in fluid resistance due to a difference in yarn structure.

However, these documents aim to reduce resistance mainly in the direction of fluid flow when the fabric is used as clothing such as a swimsuit, and the resistance reduction in the other direction of the fabric is not sufficiently considered. There was a problem. In Patent Document 11, the micro-compression characteristics of the surface are examined, and resistances other than the direction in which the fluid flows are considered, but in the case of a swimsuit provided with a jacquard or an elastic layer to reduce fluid resistance in each direction There was a problem that the elongation of the dough was hindered.
Japanese Patent Laid-Open No. 7-279038 JP-A-3-137203 JP-A-3-37204 JP 7-43104 A JP-A-8-46209 JP-A-9-1721 JP-A-11-52610 Japanese Patent Laid-Open No. 8-11751 Japanese Patent Laid-Open No. 9-9107 Japanese Patent Laid-Open No. 2005-88018 WO2004 / 001112

An object of the present invention is to provide a fabric and sportswear that can solve the above-described problems of the prior art and can further reduce the resistance of a human body to a fluid such as air or water. In other words, since the shape of the human body is uneven, it is impossible to configure the entire wear that comes into contact with the fluid in only one direction of the fabric when wearing wear such as swimsuits and coming into contact with the fluid. It touches in various directions. Further, in swimming or the like, the fabric constituting the wear for moving the legs, arms, etc. comes into contact with the fluid in all directions. Accordingly, an object of the present invention is to provide a fabric and sportswear that can realize resistance reduction in all directions of the fabric and can impart stretchability so as not to hinder movement during exercise. This is thought to lead to a reduction in overall wear resistance when wearing the wear.

In view of the above-mentioned problems, the present inventors have repeatedly studied in consideration of stretchability for the purpose of reducing resistance in all directions such as the warp direction, the horizontal direction, and the oblique direction of the fabric. It has been found that by using fiber multifilaments in the form of stripes and providing streak-like ridges in a direction perpendicular to the stripes, the effect of reducing fluid resistance is further increased, and the present invention has been completed.

That is, the invention claimed in the present application is as follows.
(1) A fabric composed of two or more types of synthetic fiber multifilaments and elastic yarns having different cross-sectional shapes, wherein the synthetic fiber multifilaments are arranged in a stripe shape, and a direction perpendicular to the direction in which the stripe is formed A fabric having a streak-like convex portion, and the convex portion is water-repellent.
(2) The width of the line-shaped convex part is 100 to 2500 μm, and the height of the convex part is 20 to 30 of the width of the convex part.
The fabric according to (1), which is 0%.

(3) The fabric according to (2) above, wherein the streaky convex portion has undulations.
(4) The fabric according to (3), wherein the waviness period is 1000 to 20000 μm, and the waviness width is 5 to 70% of the waviness period.
(5) The fabric according to any one of (1) to (4), wherein at least two types of fibers of the synthetic fiber multifilament are fibers having different degrees of atypicality.
(6) The fabric according to (5) above, wherein the difference in the degree of atypical difference between the two types of fibers having different degrees of atypicality is 1 to 8.
(7) The fabric according to any one of (1) to (6) above, wherein at least two kinds of fibers of the synthetic fiber multifilament are fibers having different circumferential lengths.

(8) The fabric according to (7) above, wherein the ratio of the circumferential lengths of the two types of fibers having different circumferential lengths (larger circumferential length / smaller circumferential length) is 1.1 or more.
(9) The fabric according to any one of (1) to (8) above, wherein any one of the synthetic fiber multifilaments has a recess having an angle of 120 degrees or less in the fiber cross section.
(10) The fabric according to any one of (1) to (9) above, wherein the stripe has a width of 1 to 10 mm.
(11) The fabric according to (10) above, wherein the stripe has undulations.
(12) The fabric according to (11), wherein the waviness period is 1000 to 20000 μm, and the waviness width is 5 to 70% of the waviness period.

(13) The fabric according to any one of (1) to (12), wherein the synthetic fiber multifilament is a polyester fiber.
(14) The above fabrics (1) to (13), wherein the fabric is calendered.
).
(15) The fabric according to any one of (1) to (14), wherein the stretchability in the vertical and horizontal directions is both 90% or more.
(16) Sportswear, wherein the fabric according to any one of (1) to (15) is used at least in part.

According to the fabric and sportswear of the present invention, since fibers having different cross-sectional shapes exist in a stripe shape, the flow speed of fluid can be changed in this portion, and resistance to water and air parallel to the direction of the stripe is reduced. it can. Furthermore, since there are streaky convex portions in the direction perpendicular to the stripes, the resistance reduction effect is also great in the direction perpendicular to the stripes. In addition, since the fibers having different cross-sectional shapes form streak-shaped convex portions, the resistance reduction effect is increased as compared with the convex shape with a uniform thread type that causes a fine change in the flow of water. Further, if the stripes and the streaky convex portions are waved, the resistance reduction effect in the oblique direction is increased, and the fabric and sportswear are excellent in the resistance reduction effect in all directions. Moreover, the fabric and sportswear of the present invention maintain elasticity that does not hinder elasticity during exercise.

Hereinafter, the present invention will be described in detail.
The fabric of the present invention is composed of two or more types of synthetic fiber multifilaments and elastic yarns having different cross-sectional shapes.
Here, the fibers having different cross-sectional shapes refer to fibers having different circumferential lengths per unit area (hereinafter simply referred to as circumferential length) and / or fibers having different atypicalities.
The circumferential length is represented by the ratio of the circumferential length when the circumferential length of the round cross-section yarn having the same cross-sectional area is 1, and the circumferential length increases as the flatness of the yarn or the yarn having irregularities on the surface increases.
The degree of atypicality is represented by the ratio (major axis / minor axis) of the major axis (the diameter of the longest part) and the minor axis (major axis and vertical axis) of the cross section of the single yarn fiber.

In the present invention, it is preferable that the peripheral lengths of at least two kinds of fibers of the synthetic fiber multifilament are different. When the fiber having the smaller circumference is A and the fiber having the larger circumference is B, the ratio of the circumferences of A and B (periphery of B / perimeter of A) is 1.1 or more, 2.0 Or less, more preferably 1.2 or more and 1.8 or less. Further, from the viewpoint of further reducing the fluid resistance, it is preferable that the circumference of B is 1.2 or more.

The difference in perimeter is manifested by differences in the flatness of each fiber, the presence or absence of irregularities, the number or shape of the fibers. In addition, when the fiber cross section of B has irregularities, it is preferable because the water-repellent agent is better placed and the durability of the water-repellent performance is improved. In particular, it is more preferable to have a recess having an angle of at least one recess of 120 degrees or less.
The angle here refers to the angle of the bottom of the recess when a triangle is formed by connecting both contact points with the cross-section when a tangent is drawn to the cross-sectional outline in the recess of the fiber cross section and the bottom of the recess.
In addition, it is preferable that at least two kinds of fibers in the synthetic fiber multifilament have different degrees of deformation.

The difference in the degree of atypical difference between the two types of fibers is preferably 1 to 8, more preferably from the viewpoint of increasing the effect of reducing fluid resistance due to the difference in the degree of atypical when yarns having different atypical degrees are arranged in stripes. Is 2-5. If the difference in the degree of profile is less than 1, the effect of reducing the size of the generated vortex due to the difference in profile, that is, the effect of reducing the fluid resistance is reduced. The strength tends to decrease.
Moreover, since a bending stress will become small and a fabric will become soft when atypical degree is large, the comfort when it wears as clothes improves.

The fiber cross-sectional shape of the synthetic fiber multifilament used in the present invention is not particularly limited,
Deformed yarns such as round, triangular, W, V, T, flat eight leaf, dogbone, and dumpling
Alternatively, these hollow fibers or the like are used, but they are close to a round shape and have a circumference and / or atypical degree of 1.
It is preferable to combine a fiber close to 2 and a fiber having a large peripheral length and / or a high degree of atypicality. Atypical cross-section fibers such as W-type, V-type, dogbone type, and ∞-type are more preferable because both the circumferential length and the atypical degree are large and the cross section has at least one concave portion with an angle of 120 degrees or less. In particular, the W type and the ∞ type have recesses and have a high degree of atypia, so that excellent effects can be obtained.

In the present invention, two types of synthetic fiber multifilaments having different cross-sectional shapes may be used, but three or more types of synthetic fiber multifilaments may be arranged in a stripe shape. In this case, it is preferable that the two types of synthetic fiber multifilaments having a wide stripe width have the above-described profile difference and / or circumferential length ratio.

The fiber material of the synthetic fiber multifilament used in the present invention is not particularly limited. For example, multifilament fibers such as polyester, polyamide, polypropylene, and polyurethane can be used, and one or many kinds of filament yarns can be used. Although it can be used, it is preferable to use a polyester-based multifilament in order to enhance the smoothness and reduce the fluid resistance by calendering described later.

There is no limitation in particular in the elastic yarn used for this invention, For example, a polyurethane fiber, a polytrimethylene terephthalate fiber, a polybutylene terephthalate fiber etc. are used suitably.
These fibers are used by knitting or knitting, but a two-way tricot is preferably used particularly from the viewpoint of stretchability.
There is no particular limitation on the total fineness and single yarn fineness of the yarn used in the fabric, and the total fineness is usually 33 to
Those having 167 dtex and single yarn fineness of 0.5 to 5 dtex are preferably used.

In the present invention, two or more types of multifilaments having different cross-sectional shapes are used in a stripe shape. The stripe shape referred to here means a stripe shape, which means that the stripes are arranged substantially in parallel with a certain width.
The stripe width is preferably 1.5 to 20 mm, more preferably 1.5 to 7 mm.
It is also possible to stripe multifilaments having different cross-sectional shapes with a width in this range and make the width of other multifilaments 1.5 mm or less.
The fabric may be either a knitted fabric or a woven fabric, and the stripes of two or more types of multifilaments having different cross-sectional shapes may be formed in any direction such as warp, weft, and slant of the fabric, and the method is not particularly limited.

Also, it is very preferable to give the stripes undulations. The resistance of the fabric of the present invention is further enhanced by providing the stripes with undulations. Swelling means that the stripe is wavy in the horizontal direction. As shown in JP 2005-188018 A, the resistance is reduced by the stripe of the surface along the flow direction of the fluid.
It has been found that the resistance reduction effect is higher when the stripe has undulations than when the stripe is linear. The mechanism for reducing fluid resistance is not always clear, but when comparing a straight stripe with a wavy stripe, the straight stripe has a wavy stripe that makes it difficult for the fluid to travel on the stripe and the fluid travels on the fabric. Therefore, the size of the vortex generated is reduced. Since resistance is known to be proportional to the square of the size of the generated vortex, it is presumed that resistance reduction is promoted. Furthermore, it can confirm that the resistance reduction effect is seen also in the diagonal direction of cloth | dough by having a wave | undulation, and it can make the resistance reduction effect of the fabric of this invention the resistance reduction of all directions combined with the below-mentioned resistance reduction effect.

It is preferable that the waviness period of the stripe is 1000 to 20000 μm, and the waviness width is 5 to 70% of the waviness period. The period of undulation refers to the length of the repeating unit in the length direction of the wave. When the undulation period is less than 1000 μm or exceeds 20000 μm, the effect of reducing the size of the generated vortex may not be sufficiently exhibited.
The waviness width is the amplitude of waviness and is the average value of the maximum deflection widths in the width direction in one cycle. If the wave period is less than 5%, the wave effect is poor, and if it exceeds 70%, the resistance reduction effect in the direction parallel to the flow by the muscle is reduced. The period and width of the swell according to the present invention are not necessarily constant, and may vary within the fabric.

The greatest feature of the present invention is that it has a streak-like convex portion in a direction orthogonal to the direction of the stripe formed from two or more types of synthetic fiber multifilaments having different cross-sectional shapes.
As a result, the resistance reduction effect not only in the direction parallel to the stripes but also in the direction perpendicular to the stripes is increased. When the fabric of the present invention is used in the vertical or horizontal direction, both the vertical and horizontal resistances can be reduced. it can. This effect can be achieved simply by placing the conventional resistance reduction method vertically and horizontally, that is, with a method of arranging stripes in a vertical and horizontal pattern, or a method of arranging stripes in a vertical and horizontal pattern. In this case, the flow of water is disturbed and the resistance reduction effect is not seen. Only when the stripe and streak technique shown in the present invention is used separately for the vertical and horizontal directions, the resistance reduction effect of both the vertical and horizontal directions is exhibited.

The streak-like convex part referred to in the present invention is formed on the body surface side of the fabric. The width of the convex part is preferably 100 to 2500 μm, and the height of the convex part is 20% to 300% of the width of the convex part. It is a minute streaky convex part. By having the convex portion, compression deformation near the fabric surface is likely to occur,
A rectifying effect is also added, and a resistance reducing effect can be obtained. The width of the protrusion is more preferably 100
˜1500 μm. The width of the convex part here is 10 of the height of the convex part from the tip of the convex part of the line.
% Is the average value of the widths of the protrusions cut by the surface with the distance reduced by%, and the height of the protrusions is the average value of the thickness difference between the tips of the protrusions and the most concave portions. When the width of the convex portion exceeds 2500 μm, the area that receives the resistance of the fluid increases, so that deformation due to compression decreases, and the resistance reduction effect decreases accordingly. Compressive deformation tends to occur when the width of the convex portion is small, but 100 μm
If the ratio is less than 1, the resistance reduction effect is reduced because the amount of deformation is small. In order to cause effective deformation by compression, the height of the convex portion is more preferably 30 to 250% of the width of the convex portion,
It is preferable that it is 1000 micrometers or less.

The method for applying the streak is not particularly limited, and may include a method of forming the above minute unevenness using a jacquard knitting machine or a loom, or forming a convex part by partially increasing the swing width of the tricot knitting machine. Is possible. In addition, the streaks of the present invention do not only mean that the convex portions are positioned in a straight line, but may be curvilinear, dot-like, etc., and are not particularly limited. The case where it arranges in is included. Among these, from the viewpoint of stretchability, the method of partially enlarging the wrinkle width on the knitted fabric based on two-way tricot is most preferable.

The interval between the convex portions is not limited, but the rectification effect is maximized in the range of 1000 to 3000 μm,
The rectification effect decreases as the value is out of this range. The surface roughness increases as the interval between the convex portions increases. The interval between the convex portions means an average value of the distance between a line that bisects the width of the convex portion (convex streaks) and a line that bisects the width of the next convex portion (convex streaks). The inclination between the convex portion and the concave portion is not limited, and the cross section may be trapezoidal, semicircular, or the like. When the convex portions and the concave portions are trapezoidal, the width of the convex portions and the concave portions is preferably 20 to 40% of the interval between the concave and convex portions.
When the tip of the convex portion is calendered and smooth while having the convex portion streak, the effect of reducing fluid resistance is particularly great.

Since the streaky convex portion of the present invention exists in a direction orthogonal to the stripe formed by two or more types of synthetic fiber multifilaments having different cross-sectional shapes, the length of the convex portion is seen when one convex portion is viewed. In the direction, fibers having different cross-sectional shapes are arranged in a border shape, for example. The present inventor has found that this structure is more excellent in the resistance reduction effect than the conventional convex portion of uniform yarn type. The reason for this is not clear, but the minute difference in the length direction of the convex part of the fiber structure forming the convex part brings about a fine change in the flow of water, compared with the convex part with a uniform thread type. It is estimated that the resistance reduction effect is increased.

In the fabric of the present invention, the resistance-reducing effect is further increased by the streak-shaped convex portion having waviness in at least one direction. This effect is the same as the effect of the stripe swell described above, and it is difficult for the fluid to travel on the ridge-like unevenness by making the ridge-like undulation, the size of the generated vortex is reduced, and the resistance reduction is promoted. It is estimated to be. Further, by providing the ridges on the ridges, when the minute surface is compressed, escape occurs when there is no undulation, and the minute compression of the surface can be increased.

It is preferable that the waviness period is 1000 to 20000 μm and the waviness width is 5 to 70% of the waviness period. The period of undulation refers to the length of repeating units in the wave length direction. If the undulation period is less than 1000 or more than 20000 μm, the effect of reducing the size of the generated vortex may not be sufficiently exhibited. .
The waviness width is the amplitude of waviness and is the average value of the maximum deflection widths in the width direction in one cycle. If the wave period is less than 5%, the wave effect is poor, and if it exceeds 70%, the resistance reduction effect in the direction parallel to the flow by the muscle is reduced. The period and width of the swell according to the present invention are not necessarily constant and may vary.
As a method for imparting undulation to the line-shaped convex portion, a method using a jacquard knitting machine or a method using a jacquard loom is preferably used, but two or more types of synthetic fiber multifilaments having different cross-sectional shapes are formed in a stripe shape. As a method of arranging and forming a streak-shaped convex part orthogonal to the direction of the stripe and further waviness the convex part, the stripe is formed by forming an atlas structure such as a 4-course atlas or a 6-course atlas. The convex portion may be formed by increasing the swing such as a two-needle swing at a position (inflection point) where the amplitude of the swell is maximized. The ridges formed in this way are given fine undulations due to the fine tension difference between the fibers forming the stripes having different cross-sectional shapes.

Furthermore, the fabric of the present invention is subjected to water repellent treatment on at least the convex portion, preferably the entire surface. By this water repellent treatment, the water content of the fabric is reduced, and the resistance value corresponding to the moisture content can be reduced as compared with the case where the water repellent finish is not applied. The water repellent finish is preferably applied to the entire surface. In the fabric of the present invention, since synthetic fiber multifilaments having different cross-sectional shapes are used, a fiber having a large peripheral length and / or atypical degree, particularly a concave portion including irregularities on the fiber surface and having at least one angle of 120 degrees or less. In the case of having a water repellent, the water repellent is easily placed on the uneven portion of the yarn applied during the water repellent processing, and a high water repellent effect can be obtained as compared with a multifilament having a small degree of irregularity.

For this reason, when the fabric is used as sportswear, it is arranged in stripes 2
A difference occurs in the level of water repellency of synthetic fiber multifilaments with different cross-sectional shapes, and there is a difference in the water flow speed on the fabric surface, preventing the growth of vortices. be able to.
In particular, even if washing is repeated or used in water, etc., fibers having a large peripheral length and / or irregularity, particularly fibers having concaves and convexes on the fiber surface and at least one angle of 120 degrees or less Since the water repellent is less likely to fall off and the water repellency is less likely to decrease, an excellent effect of reducing fluid resistance can be obtained for a long period of time.

Although there is no limitation in particular in the water-repellent processing agent used for water-repellent processing, water-repellent agents, such as a fluorine type and a silicon type, are used suitably. After these processing agents are attached and dried by a dip nip method or the like, heat treatment is preferably performed at 150 ° C. to 180 ° C. in order to enhance the water repellent effect.
Further, by performing calendar processing in addition to water repellent processing, a fluid resistance reduction effect due to smoothness is also added, and a further fluid reduction effect can be obtained.

In the fabric of the present invention, the body surface side layer (the surface layer of the fabric) may be an elastic layer. This elastic layer preferably has a micro surface compression ratio of 20% or more. The thickness of the elastic layer is 30-500
μm is preferable, and more preferably 300 to 500 μm. Although it does not limit to the kind of resin which comprises an elastic layer, a polyurethane resin, an acrylic resin, etc. are used suitably.
When the fabric is used for sportswear, either the stripe or the streak-like convex portion may be used so as to be parallel to the body length direction, or may be used obliquely. Therefore, compared to conventional swimwear
There are few design restrictions, and the fit can be taken into consideration, and the design can be made freely.

The fabric of the present invention is preferably used for the entire sportswear, but another fabric may be used for a part depending on the design of the sportswear. For example, when used for swimsuits, particularly competition swimsuits, it is preferably used for 20% or more of the overall clothing area, particularly preferably 50% or more, in order to reduce the resistance of water. In particular, it is preferably used for a chest, a buttock, etc. where water flow resistance is easily applied.

An example of a swimsuit made of the fabric of the present invention is shown in FIG. This is an example in which the fabric of the present invention having the straight convex portion 11 and the stripes 12 and 13 in the direction perpendicular to the convex portion is used for almost the entire swimsuit excluding the shoulder strap. The stripe includes a portion 12 in which the synthetic fiber multifilament X is disposed and a portion 13 in which the synthetic fiber multifilament Y having a cross-sectional shape different from X is disposed.
And has a swell. In the swimsuit of this figure, the convex part 11 is arranged so as to be in the body length direction of the swimsuit, and the waist part and the buttocks part are arranged at a slight angle from the body length direction. In the present invention, not limited to this example, for example, the convex portion may have undulations, or the stripe direction may be arranged to be the body length direction of the swimsuit.

Furthermore, in the case of sportswear that is subject to air resistance, such as athletics wear, it is preferably used on the entire surface of clothes, particularly the chest and thighs.
The fabric of the present invention can be post-processed such as dyeing by a known method. If two or more kinds of fibers having different cross-sectional shapes used in the fabric of the present invention have a difference in dyeability, a color difference is produced in the stripe without taking a special method, and a fabric rich in design is obtained. Can do.

According to the fabric of the present invention and sportswear using the fabric, the resistance to water and air can be reduced because the flow speed of the fluid changes due to the unevenness formed by the difference in the fiber structure constituting the fabric. The effect of reducing fluid resistance can be obtained.
In addition, when the fabric is dyed, a color difference due to a difference in the degree of atypicality is generated, so that a fabric having high design properties can be obtained.
The fabric of the present invention is suitably used for athletics, skiing, skating, particularly ski jumping wear, speed skating wear, cycling wear, etc., in addition to swimming swimsuits.

Hereinafter, the present invention will be specifically described by way of examples, but the present invention is not limited thereto. The evaluation in the examples was performed by the following method.
1) Atypical degree A cross-sectional photograph of the fabric is taken, and from the cross-sectional photograph, the major axis (longest diameter) and minor axis (major axis and perpendicular diameter) of the single yarn fiber constituting the fabric are read. The minor axis was calculated.
2) Peripheral length of the cross section of the yarn A cross section photograph of the fabric is taken, the cross section length and the cross sectional area of the single yarn fiber constituting the fabric are calculated from the cross section photograph, and the round cross section yarn having the same cross section area. It was calculated by dividing by the circumference of.
3) Concave portion of the yarn cross section When a cross-sectional photograph of the fabric is taken, and the cross-section of the single yarn fiber constituting the fabric has unevenness from the cross-sectional photograph, each of the adjacent convex portions and the concave portions between them among the unevenness of the fiber cross section The angle of the recess when the apex is connected to form a triangle is measured, and when the angle is 120 degrees or less, the recess is defined.

4) Fluid resistance The fluid resistance was measured based on the apparatus and measurement method described in Example 1 of JP-A-7-63749. That is, it was performed using the fluid resistance measuring apparatus shown in FIG. However, the flow rate was changed to 74L. This device comprises an inclined channel 4 through which a fluid flows and a fabric sample 3 around it.
Is mounted in the fluid flow in the inclined flow path 4 and the tip of the fixture 2 that is buried and floated in the fluid is passed through the inclined flow path 4 from the upper side of the inclined flow path 4. A yarn 1 attached to the fixture 2 and a measuring device 5 attached to the rear end of the yarn 1 and measuring the tension of the yarn 1 are provided. In this apparatus, the fabric sample 3 is attached around the fixture 2 to which the yarn 1 is attached,
The fixture 2 is placed in the fluid flow while being supported by the thread 1, the tension of the thread 1 when the fixture 2 is buried and floated in the fluid, and the thread 1 is stretched substantially in the fluid flow direction. The fluid resistance of the fabric is measured. Specifically, an acrylic circular pipe having a diameter of 3 cm, a length of 1.5 m, and a branch pipe provided at an upper position of 30 cm is inclined at 15 degrees as an inclined flow path. Water is poured from the water supply at a flow rate of 74 liters / min, hemispherical silicone rubber caps are attached to both ends of a 1.6 cm diameter, 16 cm long aluminum tube (apparent specific gravity 0.68 g / cm), and one end A sample is wound around a fixture to which a polyester monofilament yarn having a length of 150 denier and a length of 120 cm is attached, and the sample is placed in an acrylic tube and measured. As a tension measuring instrument, use an Aiko push pull gauge attached to a polyester monofilament yarn, cut the sample into 4.5cm x 14.5cm, sew it into a tubular shape, cover the fitting, and adhesive tape on both ends. Wrap and fix.

5) Stretchability A 2.5 cm wide sample was pulled at a speed of 300 mm / min, and the elongation (%) at 22.05 N
).
6) Wearing feeling A one-piece-type swimsuit was prepared and allowed to be worn by a swimmer to examine the wearing feeling.
Those that could swim faster than before were evaluated as ○, and those that felt the same or slower than before were evaluated as ×.

[Example 1]
1.0 on the front side of the tricot knitting machine, 1.0 on the circumference per unit area of the yarn cross section
Polyester (56 dtex) 4 having a W-shaped cross section having a recess having a round cross section of polyester (56 dtex) of 40% by mass, a degree of profile 3.8, and a circumferential length of 1.4 per unit area of the yarn cross section
0 mass% was supplied so as to form a stripe with a width of 2 mm each, and 20 mass% of spandex (44 dtex) was supplied to the back ridge to produce a 36GG tricot knitted fabric. In the knitting length direction, the wrinkles were increased about every 2 mm to create streaks in the direction perpendicular to the stripes. After the normal dyeing process, a fluorine-based water repellent was attached by the dip nip method, dried and heat treated at 170 ° C., and the fluid resistance was measured with the streak in the vertical direction. In addition, a swimsuit as shown in FIG. 2 in which muscles were arranged in the body length direction using this fabric was made to be worn by a swimmer, and the wearing feeling was examined.

The results of measuring the fluid resistance of this fabric are shown in Table 1.
In the table, the fluid resistance was a value obtained by subtracting the tension of 70 g when measured without wearing the fabric, and the vertical and horizontal 45 ° directions were parallel to the water flow direction.
The fabric obtained in Example 1 has low fluid resistance in the vertical direction, and low resistance in the horizontal and diagonal directions. It was confirmed that it was possible to swim fast even when worn by swimmers.

[Example 2]
In order to give the stripes a swell when knitting the knitted fabric of Example 1, a 6-course atlas structure was formed, and a streak-like convex part having a swell in the direction orthogonal to the stripes was made by swinging two needles at the inflection point. Others were finished and evaluated in the same manner as in Example 1. This fabric had a smaller fluid resistance in the vertical and diagonal directions.

[Example 3]
A fabric obtained by calendering the knitted fabric of Example 2 at 180 ° C. was produced, and the same measurement as in Example 1 was performed. As a result, the fabric of Example 3 was a fabric having a remarkably small resistance to running water, with the addition of a surface smoothing effect.

[Example 4]
Polyester of Δ cross section having a profile degree 1.3 and a circumferential length of 1.1 per unit area of the yarn cross section (84
dtex) 30% by mass of yarn 6 mm wide, degree of profile 2.7, perimeter per unit area of yarn cross section 1
. 28G obtained by making 50% by mass of a polyester yarn (84 dtex) having an L-shaped cross section having three recesses into a stripe shape having a width of 10 mm and knitting with 20% by mass of spandex (44 dtex).
A G tricot knitted fabric was prepared, and the wrinkles were increased every 3.5 mm to create streaks in a direction perpendicular to the stripes. After the normal dyeing process, a fluorine-based water repellent was adhered and dried by a dip nip method, and a heat calendering process was performed at 180 ° C., and the same measurement as in Example 1 was performed.
The fabric obtained in Example 4 had a low fluid resistance, and it was confirmed that it was able to swim quickly even when worn on a swimmer.

[Example 5]
Nylon 66 (70 dtex) with a round cross section with a profile of 1 and a circumference of 1 per unit area of the yarn cross section
) Nylon 66 yarn (70 dtex) having a recess of 3 mm width, 3 mm width, irregularity degree 2.8, circumferential length 1.3 per unit area of the yarn cross section 40 mm% of the yarn cross section 3 mm width Then, a 32GG tricot knitted fabric knitted with 20% by mass of spandex (44 dtex) was produced, and the wrinkles were increased every 8 mm to create streaks in a direction perpendicular to the stripes. After the normal dyeing process, the fluorinated water repellent is attached and dried by the dip nip method.
Heat treatment was performed at 70 ° C., and the same measurement as in Example 1 was performed.
The fabric obtained in Example 5 had a low fluid resistance, and it was confirmed that it was able to swim quickly even when worn on a swimmer.

[Comparative Example 1]
A fabric was produced in the same manner as in Example 1 except that all the yarns of the tricot knitted fabric of Example 1 used a round cross-section polyester filament (56 dtex) having a profile of 1 and a circumference of 1 per unit area of the yarn cross section. The same evaluation was performed and the results are shown in Table 1.
As a result, it was a swimsuit with high fluid resistance, no color change, and poor design.

[Comparative Example 2]
Fabrics were produced in the same manner as in Example 1 except that the knitting was not changed during the knitting of the tricot knitted fabric of Example 1, that is, without forming a line perpendicular to the stripe, and the same evaluation was performed. The results are shown in Table 1, and it was a swimsuit with a large vertical and oblique fluid resistance.

[Comparative Example 3]
Table 1 shows the results of a similar evaluation performed on the tricot knitted fabric of Example 1 without subjecting it to water-repellent finishing. It was a swimsuit with large fluid resistance and heavy wearing feeling.

[Comparative Example 4]
A fabric was produced in the same manner as in Example 5 except that when a tricot knitted fabric similar to that in Example 5 was produced, a wrinkle width was increased every 2 mm to form a streak with a width of 3 mm, The results of the same evaluation are shown in Table 1. It was a swimsuit with high fluid resistance.

[Comparative Example 5]
80% polyester with round cross section (56 dtex) and spandex (44 dtex)
Create a knitted fabric with a pattern of 20% 32GG Jacquard knitted fabric with a convex part width of 250μm, height of 230μm, spacing of 1800μm, period of 8000μm and width of 2000μm Table 1 shows the results obtained by performing the processing in the same manner as in Example 1 and evaluating the protrusions in the vertical direction. Although the fluid resistance was small, it was a swimsuit with poor stretchability and poor wearing feeling.

Since the fabric of the present invention uses fibers having different special cross-sectional shapes, the flow speed of the fluid changes, resistance to water and air is small in the direction, and the cross-sectional structure is different in the orthogonal direction. Therefore, the cloth has low resistance to water and air even in a direction parallel to the line. The fabric of the present invention is also excellent in stretchability, and when dyed due to the effect of an atypical cross-section fiber, a color difference due to a difference in peripheral length or atypical degree occurs, and a fabric rich in design can be obtained. For this reason, this fabric can be suitably used as sportswear such as swimsuits for swimming races, athletics wears, skis, particularly ski jumping wears.

Explanatory drawing of a fluid resistance measuring apparatus. The figure which shows the front, back, and side surface of the swimsuit in which the fabric of this invention was used.

Explanation of symbols

1 ... Thread,
2 ... Fitting,
3 ... fabric sample,
4 ... inclined channel,
5 ... Measuring instrument,
6 ... the frame,
7 ... Branch pipe,
8 ... Fluid supply pipe,
DESCRIPTION OF SYMBOLS 9 ... Valve | bulb 11 ... Streaky convex part 12 ... Stripe part in which synthetic fibers X having different cross-sectional shapes are arranged 13 ... Stripe part in which synthetic fibers Y having different cross-sectional shapes are arranged

Claims (16)

A fabric composed of two or more types of synthetic fiber multifilaments and elastic yarns having different cross-sectional shapes, wherein the synthetic fiber multifilaments are arranged in a stripe shape, and a streak shape is perpendicular to the direction in which the stripe is formed A fabric characterized in that the convex portion is water repellent. The width of the line-shaped convex part is 100 to 2500 μm, and the height of the convex part is 20 to 300% of the width of the convex part.
The fabric according to claim 1, wherein   The fabric according to claim 2, wherein the line-like convex portion has a wave. The waviness period is 1000 to 20000 μm, and the waviness width is 5 to 70 of the waviness period.
The fabric according to claim 3, which is%. The fabric according to any one of claims 1 to 4, wherein at least two kinds of fibers of the synthetic fiber multifilament are fibers having different degrees of atypicality. The difference in the degree of atypical difference between the two types of fibers having different degrees of atypicality is 1 to 8.
The fabric described in 1. The fabric according to any one of claims 1 to 6, wherein at least two types of fibers of the synthetic fiber multifilament are fibers having different circumferential lengths. The fabric according to claim 7, wherein the ratio of the circumferential lengths of the two kinds of fibers having different circumferential lengths (larger circumferential length / smaller circumferential length) is 1.1 or more. The fabric according to any one of claims 1 to 8, wherein any one of the fibers of the synthetic fiber multifilament has a concave portion having an angle of 120 degrees or less in its fiber cross section. The width of a stripe is 1.5-20 mm, The fabric in any one of Claims 1-9 characterized by the above-mentioned.   The fabric according to claim 10, wherein the stripe has a wave.   The fabric according to claim 11, wherein the waviness period is 1000 to 20000 μm and the waviness width is 5 to 70% of the waviness period. The fabric according to any one of claims 1 to 12, wherein the synthetic fiber multifilament is a polyester fiber. The cloth according to any one of claims 1 to 13, wherein the cloth is calendered. The fabric according to any one of claims 1 to 14, wherein the stretchability in the vertical and horizontal directions is both 90% or more. Sportswear, wherein the fabric according to any one of claims 1 to 15 is used at least in part.

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