JP2017179664A - Variably breathable stretch fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a highly stretchable fabric that has an ultraviolet screening property and reversibly variable breathability.SOLUTION: A fabric is formed of polyurethane elastic yarn. The fabric has: 20 cc/cmsec or higher of air permeability difference between the fabric in an unextended state and that in an extended state by 20% in one of vertical or horizontal direction or both directions; 30 or higher of UPF evaluation in an unextended state; 20% or higher stretchability; 80% or higher of elongation recovery ratio; and a polyurethane elastic fiber blend ratio at 5 weight% or higher of the entire fabric.SELECTED DRAWING: None

Description

  TECHNICAL FIELD The present invention relates to a breathable variable stretch fabric that has ultraviolet shielding properties and excellent stretch properties that allow reversible changes in breathability.

  Traditionally, as a means of greatly improving the air permeability of fabrics, weaving by controlling the density by the fabric structure and partially using yarn that dissolves in specific solvents, and dissolving them during the dyeing process A technique for creating a gap in the air (Patent Document 1) and a technique for physically making a hole by laser punching, etc. have been proposed, and it is possible to dramatically increase the initial air flow rate. It is possible to effectively release the hot air and moisture out of the system. However, when a person wears clothes, the environment in the clothes is not constant in various scenes, such as immediately after wearing, during exercise, and at rest, and the required breathability is different, so as to provide a comfortable wearing environment The problem was that variable ventilation performance was required.

For example, to obtain reversible aeration, use a swellable conjugate fiber in which a high water swellable component and a low water swellable component are combined side by side, and change the air permeability as the moisture in the clothes increases due to sweating. There is known a method capable of performing (Patent Document 2).
However, when it rains, it absorbs humidity even if it is water repellent, so even if the humidity in the clothes is not rising, it may absorb the moisture of the outside air and increase the air permeability. is there.

  On the other hand, a fabric with variable air flow rate has been proposed in which the air permeability changes reversibly by energization regardless of humidity (Patent Document 3), but it may not be versatile as clothing because it requires electricity. There is sex.

JP 2011-089231 A JP 2006-161237 A JP 2007-277791 A

Accordingly, an object of the present invention is to stably provide a breathable variable stretch fabric having a variable breathability that suppresses breathability at rest, increases breathability when the fabric is stretched during exercise, and has high stretchability. There is to do.

The present invention is to solve the above-mentioned problems, and is a woven fabric using polyurethane elastic fibers, and the air permeability when not stretched measured by A method (Fragile type) described in JIS L1096: 2010, A breathable variable stretch fabric characterized by having a difference of 20 cc / cm ² / sec or more in air permeability when stretched by 20% in one or both of the vertical and horizontal directions.

According to a preferred aspect of the woven fabric of the present invention, the woven fabric has an air permeability of 30 cc / cm ² / sec or less when not stretched.

According to a preferred aspect of the woven fabric of the present invention, the woven fabric has an air permeability of 40 cc / cm ² / sec or more when one or both of the vertical and horizontal directions are stretched by 20%. is there.

According to a preferred aspect of the woven fabric of the present invention, in the woven fabric, the polyurethane elastic fiber has a usage ratio of 5% by weight or more based on the entire woven fabric.
According to a preferred embodiment of the woven fabric of the present invention, the UPF evaluation of the woven fabric measured according to Australian / New Zealand Standard 4399 has an ultraviolet shielding effect of 30 or more when not stretched.
According to a preferred embodiment of the woven fabric of the present invention, the stretch rate in the vertical direction and / or the horizontal direction measured with a KES-FB1-AUT0-A automatic tensile tester (500 cN / cm load) manufactured by Kato Tech. EMT) is 20% or more and the stretch recovery rate (RT) is 80% or more.
According to a preferred aspect of the woven fabric of the present invention, when weaving the woven fabric, it is an empty wing structure in which at least two adjacent warp yarns are continuously skipped, and the space between the wings is 1 mm or more.

According to a preferred aspect of the fabric of the present invention, a part of the warp yarn and / or the weft yarn of the fabric is a fabric composed of fibers dissolved in water and / or a specific solvent, and the water and / Or by dissolving and removing in a specific solvent, a hole penetrating from the front surface to the back surface according to the fineness of the entangled portion of the fiber at the time of woven fabric elongation, and other than the entangled portion of the fiber according to the fineness, The yarn consisting of fibers that cannot be completely removed with water and / or a specific solvent is substantially present as a part of warp yarn only or weft yarn only.
According to a preferred embodiment of the woven fabric of the present invention, a fiber that dissolves with water and / or a solvent is used in a part of the warp yarn and the weft yarn.

  According to a preferred aspect of the fabric of the present invention, the specific solvent is an aqueous alkaline solution containing sodium hydroxide.

  According to the garment using the woven fabric of the present invention, the breathability is temporarily enhanced during exercise, that is, in the state where the fabric is stretched, and the effect of discharging hot air in the garment to the outside of the system can be obtained. Further, since air permeability is suppressed at rest, that is, in a resting state, it is possible to maintain heat insulation, and to achieve both a comfortable wearing environment during exercise and rest. Thereby, a comfortable and safe wearing environment can be provided.

The woven fabric of the present invention is a woven fabric using the polyurethane elastic fiber as described above, and preferably using a covering yarn in which a polyurethane elastic fiber is arranged as a core yarn and a synthetic fiber is arranged as a sheath yarn.
The woven fabric of the present invention has 20 cc / cm when the air permeability measured by A method (fragile type) described in JIS L1096: 2010 is not extended and when one or both of the vertical and horizontal directions are extended by 20%. ^A breathable variable stretch fabric characterized by having a difference of ² / sec or more, preferably a difference of 30 cc / cm ² / sec or more, more preferably 40 cc / cm ² / sec or more.

  As a result of intensive studies on the above-mentioned problem, that is, a woven fabric having a remarkably large breathability change at the time of non-elongation and at the time of elongation, the woven fabric using polyurethane elastic fibers is divided into two or more adjacent warp yarns. Use a woven fabric with a space between the wings and a space between the wings of 1 mm or more, or use a fiber that can be dissolved and removed with water or a specific solvent for part of the warp and part of the weft. It has been clarified that variable air permeability can be imparted to the woven fabric by using the woven fabric.

  Above all, by using the covering yarn with the elastic fiber as the core yarn and the synthetic fiber as the sheath yarn, the covering yarn in the processing process is sufficiently contracted, and there is no void in the finished state in the unstretched state, but the stretch Sometimes the voids can develop and provide variable breathability.

In the present invention, a covering yarn having a synthetic fiber or the like as a sheath yarn and a polyurethane elastic fiber as a core yarn is preferably used as part of the warp and / or weft of the fabric.
As the sheath yarn, various synthetic fibers such as polyamides such as nylon 6, nylon 66, nylon 610, polyester, polyacryl, polypropylene, polyvinyl chloride, semi-synthetic fibers such as acetate and rayon, etc. are suitable. Used for.

  The form of the sheath yarn is preferably a continuous multifilament yarn composed of a plurality of single fibers. A single fiber having a uniform cross section in the length direction or a thin one can be used, and the cross-sectional shape is round, triangular, Y-type, X-type, eight-leaf type, hollow type, flat, etc. A regular one can also be used. The blending ratio of the polyurethane elastic fiber used for the core yarn is preferably 5% by weight or more with respect to the entire woven fabric from the viewpoint of obtaining a shrinkage force sufficient to close the woven fabric gap.

The polyurethane polymer constituting the polyurethane elastic fiber may be a polyurethane-urea copolymer, or a mixture or copolymer of polyurethane and polyurethane-urea. More specifically, the polyurethane polymer is preferably composed of two types of segments, that is, a soft segment and a hard segment. The soft segment is preferably composed of a polyether and / or polyester segment composed of a long molecular chain, and the hard segment is a relatively short chain derived from a reaction between an organic isocyanate and a diamine chain extender or diol chain extender. It is preferable to consist of these segments.
Depending on the intended use, the synthetic fibers and polyurethane polymers mentioned above may contain UV absorbers such as benzotriazoles, antioxidants such as hindered phenols, various pigments such as titanium oxide and iron oxide, barium sulfate, zinc oxide, and oxidation. Lubricants typified by metal soaps such as functional additives containing cesium, calcium carbonate, silver ions, etc. may be contained.

  Covering yarns include single-covered yarns in which other fibers are wound in a single layer around polyurethane elastic fibers, double-covered yarns in which other fibers are twisted around polyurethane elastic fibers, and double-covered yarns wound in double twists in upper twists, polyurethane elastic fibers And twisted yarns in which other fibers are twisted together, air-covered yarns having alternately entangled portions and opened portions obtained by simultaneously interlacing polyurethane elastic fibers and other fibers, etc. in the present invention. A single covered yarn is preferably used in view of the characteristics.

In the present invention, water or a specific solvent used for a part of the warp yarn and a part of the weft yarn includes, for example, water-soluble fiber such as polyvinyl alcohol fiber, isophthalic acid, 5-sodium sulfoisophthalate. Easy alkali-soluble fibers such as polyester fibers and polylactic acid fibers in which a third component such as acid and methoxypolyoxyethylene glycol is copolymerized can be used. These may be used alone or as a composite of two or more. When these are used singly, they can be used by arranging two or more of them in the form of arrangement, alignment, combined yarn, and twisted yarn.
The total fineness of the yarn composed of the fibers to be dissolved is preferably 33 dTex or more and 150 dTex or less in order to form a hole penetrating from the fabric surface to the back surface when the fiber is dissolved and stretched. If the total fineness is less than 33 dTex, the air permeability during elongation may be inferior. If the total fineness is greater than 150 dTex, the air permeability during elongation is good, but there is a tendency to be inferior in terms of ultraviolet shielding and closeness.

Moreover, the area of the hole penetrating from the fabric surface to the back surface is closed to the extent that the size cannot be defined when not stretched, and is 1 × 10 when stretched vertically or horizontally 20%, or vertically stretched 20%. ^-2 mm ² or more 2.5 × is preferably ¹⁰ -1 mm ² or less. When the size of the hole is smaller than 1 × 10 ⁻² mm ² , the air permeability tends to be inferior, and when it is larger than 2.5 × 10 ⁻¹ mm ² , the air permeability is good, but the ultraviolet ray shielding property is poor. There is. The size of the hole is more preferably 2 × 10 ⁻² mm ² or more and 1.6 × 10 ⁻¹ mm ² or less.

Moreover, it is preferable that the length-to-width ratio of the hole penetrating from the fabric surface to the back surface when the length or width is extended by 20% or when the length is extended by 20% is a ratio of 3: 1 to 1: 3. When the vertical / horizontal ratio deviates from the ratio of 3: 1 to 1: 3, generally when used as clothing, it tends to be inferior to physical properties such as frayed fabric edges and slip resistance, and the appearance of fabric is also blurred. May be easier to do. The vertical ratio of the holes is more preferably a ratio of 2: 1 to 1: 2 from the viewpoint that a stable fabric can be designed.
In the woven fabric of the present invention, it is important that the difference in air permeability between the unstretched state and the vertical or horizontal 20% stretch or the vertical 20% stretch is 20 cc / cm ² · sec or more.
From the literature on human skin stretch, the horizontal / vertical stretch of the upper shoulder is 3.6% / 17.6%, the horizontal / vertical stretch of the shoulder is 18.1% / 9.2%, and the rear elbow is Model measurement of horizontal / vertical elongation of 30.0% / 38.0%, buttocks horizontal / vertical elongation of 8.2% / 36.4%, patella horizontal / vertical elongation of 15.6% / 36.8% There is a result. Actually, the clothes stretch due to movement varies depending on the design and the amount of clearance, but it is said that if there is no fabric stretch of 20% or more, it is difficult to make clothes that are easy to move with a sharp silhouette.
The difference in air permeability is preferably 100 cc / cm ² · sec or less.
Further, the air permeability when not stretched is preferably 30 cc / cm ² · sec or less. If the air permeability exceeds 30 cc / cm ² · sec, the air is easily ventilated inside and outside the clothes, and as a result, the heat retaining effect is reduced. The air permeability when not stretched is more preferably 20 cc / cm ² · sec or less, and further preferably 10 cc / cm ² · sec or less. The above-mentioned air permeability is a polyurethane that can sufficiently shrink during processing, as well as studying the number and spacing of empty wings, studying the fineness and design of fibers dissolved in water and / or a specific solvent. It can be controlled by using an elastic yarn. The air permeability when not stretched is preferably 1 cc / cm ² · sec or more from the viewpoint of heat retention during non-exercising.
In the woven fabric of the present invention, the air permeability when the one or both of the vertical and horizontal directions are extended by 20% is 40 cc / cm ² / sec or more, and moisture in the clothes during exercise is discharged out of the system. It is preferable in terms of function. On the other hand, it is preferably 100 cc / cm ² / sec or less from the viewpoint of suppressing rapid discharge.
The woven fabric of the present invention preferably has an ultraviolet shielding effect with an UPF rating of 30 or more as measured by the Australian / New Zealand Standard 4399 in an unstretched state.
When the above-mentioned UPF evaluation is less than 30, as a result, the fabric has a large void or low density design, resulting in a woven fabric with poor heat retention. The above-mentioned UPF evaluation is performed by examining the number and interval of vacant wings in the winged tissue, examining the fineness of fibers dissolved in water and / or a specific solvent, and determining the arrangement according to the design, and polyurethane capable of obtaining sufficient shrinkage during the processing process. It can be controlled by using an elastic yarn. In addition, the UPF evaluation measured according to the Australian / New Zealand standard 4399 desirably has an ultraviolet shielding effect of 50+ or less from the viewpoint of comfortable clothes that protect the human body from ultraviolet rays to the maximum.
The woven fabric of the present invention has an elongation rate (EMT) of 20% or more in the vertical direction and / or the horizontal direction as measured with a KES-FB1-AUT0-A automatic tensile tester (500 cN / cm load) manufactured by Kato Tech. A woven fabric having a recovery rate (RT) of 80% or more is preferable.
By setting the stretch rate to 20% or more, it is possible to make clothes that are easy to operate with a sharp silhouette as described above. The elongation rate and the elongation recovery rate can be controlled by adjusting the draft rate of the polyurethane elastic yarn. When the elongation rate is less than 20%, there is a possibility that a comfortable wearing environment may be limited in the case of an application with a large amount of exercise such as sports clothing. The elongation rate is preferably 50% or less from the viewpoint of shape retention of clothes.
Moreover, when it falls below the said elongation recovery rate, wear durability, such as elbow loss and knee loss, may be inferior. The elongation recovery rate is preferably a value close to 100%.
Next, the manufacturing method of the textile fabric of the present invention will be described.
As a method for producing a woven fabric of the present invention, a fiber yarn that has an empty feather structure that has an interval of two or more adjacent warp yarns and the interval between empty wings is 1 mm or more, or is dissolved in water or a specific solvent. May be used for warp yarns and dissolved and removed with such water and / or a specific solvent. At that time, by using a fiber yarn that dissolves in water and / or a specific solvent as a part of the weft yarn, the fiber yarn is dissolved and removed in water and / or a specific solvent, and the above-mentioned warp is removed. A hole penetrating from the fiber surface to the back surface according to the total fineness can be formed in the entangled portion with the yarn.

Furthermore, warp yarns and weft yarns that dissolve in the same specific solvent can be made into a woven fabric that is used as part of the warp yarn and weft yarn, and dissolved and removed in the specific solvent. This is preferable. The specific solvent in which both the warp yarn and the weft yarn are dissolved may be water.
A fiber (yarn) that dissolves in water is a water-soluble fiber such as a polyvinyl alcohol-based fiber, which is dissolved and removed in water using at least one warp and at least one weft. By doing so, a hole penetrating from the fiber surface to the back surface is formed in the entangled portion of the warp yarn and the weft yarn. Regarding the warp yarn, a gap may be formed without using the water-soluble fiber by using an empty feather tissue. The temperature of the water used is preferably 20 ° C. or higher, but in order to sufficiently develop the dissolution efficiency and the crimp of the fiber that does not completely dissolve, it is a preferred embodiment that the temperature is 50 ° C. or higher. . Furthermore, in order to sufficiently develop the crimp of the fiber that is not completely dissolved, it is preferable to perform a hot water bath treatment at a temperature of 60 ° C. or higher and 100 ° C. or lower in the same bath or a separate bath.

  The specific solvent is an alkaline substance solution such as sodium hydroxide, potassium hydroxide, calcium hydroxide, magnesium hydroxide and sodium carbonate for polyester fiber and polylactic acid fiber, which are easily alkali-soluble fibers. This is a preferred embodiment for use as an alkaline aqueous solution. In particular, an alkaline aqueous solution containing sodium hydroxide is preferable, and it is preferable to dissolve and remove the alkaline aqueous solution at a bath temperature of 50 ° C. or higher. Furthermore, in order to sufficiently develop the crimp of the fiber that is not completely dissolved, it is preferable to perform a hot water bath treatment at a temperature of 60 ° C. or higher and 100 ° C. or lower in the same bath or a separate bath.

  In addition, the water-soluble fiber can be dissolved and removed in an alkaline aqueous solution in combination with an alkaline substance. The use concentration of the alkaline substance is preferably 0.1% or more for sodium hydroxide, and more preferably 1% or more from the viewpoint of increasing the dissolution time.

  The fabric of the present invention can be treated with an antistatic agent, a water absorbent, a moisture absorbent, a water repellent, an oil repellent, an antifouling agent, a colorant, a lubricant, and the like as long as the effects of the present invention are not impaired. .

  The fabric of the present invention is a sportswear, homewear, coat, blouson, blouse, shirt, skirt, slacks, indoor sportswear, pajamas, sleepwear, underwear, office wear, work clothes, food white coat, nursing white coat, It is preferably used as patient clothes, nursing clothes, school clothes, kitchen clothes and the like. Moreover, it is used also as a miscellaneous goods for an apron, a towel, a glove, a muffler, socks, a hat, shoes, sandals, a bag, etc. Further, it is preferably used as an interior article for curtains, kotatsu covers, sofa covers, cushion covers, sofa grounds, table cloths, and the like. Furthermore, it is preferably used as a bedding article, a bedding side, a sheet, a duvet cover, a pillow cover, and the like.

Next, the fabric of the present invention will be described more specifically with reference to examples. The following methods were used as various evaluation methods in the examples.
(Air permeability)
The amount of air passing through the test piece (cc / cm ² · sec) was determined using a fragile type tester by the method defined in JIS-L1096: 2010 air permeability A method (fragile type method).
(UPF evaluation)
Using a method defined by the Australian / New Zealand standard 4399, at 280 nm to 400 nm, the specimen is irradiated with a spectrophotometer or a spectrophotometer, and the transmittance is measured to calculate the UPF value. The average was taken as the UPF value.
(Elongation)
EMT (%) at a load of 500 cN / cm with a grip width of 20 cm, a grip interval of 5 cm, a pulling speed of 0.2 mm / sec, measured by a KES-FB1-AUT0-A automatic tensile tester manufactured by Kato Tech. Asked.

(Elongation recovery rate)
This is a method of measuring with a KES-FB1-AUT0-A automatic tensile tester manufactured by Kato Tech Co., Ltd. Grasp width 20cm, grip interval 5cm, speed 0.2mm / sec, recovery rate RT (%) from hysteresis of maximum load 500cN / cm )
(Mixed rate)
Based on the JIS-L1030-2: 2012 fiber product mixed rate test method, the mixed rate was determined.

Example 1
A single covering fiber yarn with a 78dTex / 68 filament polyamide fiber yarn as the sheath yarn and a 44dTex polyurethane elastic yarn as the core yarn, and 84dTex / 24 filament 5-sodium sulfoisophthalic acid are copolymerized with the warp yarn. Easily alkali-soluble polyester fiber yarns used as components were alternately arranged at a ratio of 12: 2 respectively. Copolymerized with a single covering fiber yarn having a 78dTex / 68 filament polyamide fiber yarn as a sheath yarn and a 44dTex polyurethane elastic yarn as a core yarn, and 84dTex / 24 filament 5-sodium sulfoisophthalic acid. Easily alkali-soluble polyester fiber yarns used as ingredients are alternately arranged at a ratio of 10: 3, and the warp density is 120 / 2.54 cm, and the weft density is 80 / 2.54 cm. Was woven.
Next, after scouring, drying and intermediate setting according to a conventional method, treatment in a bath was carried out at a temperature of 90 ° C. for 10 minutes in a 3% aqueous sodium hydroxide solution to completely dissolve the easily soluble polyester fiber. .
After that, dyeing, drying and finishing set were performed according to a conventional method, and the vertical density was 172 / 2.54 cm, the horizontal density was 128 / 2.54 cm, and no clear voids could be confirmed with the naked eye when not stretched. the air permeability 10.0cc / cm ² / sec, horizontal 20% air permeability during elongation 50.4cc / cm ² / sec, air permeability at vertically and horizontally 20% elongation is 70.9cc / cm ² / sec, elongation A processed cloth having a vertical ratio of 25.0%, horizontal width of 28.0%, elongation recovery rate of vertical length of 95.2%, horizontal width of 96.8%, and UPF rating when not stretched was 50+ was obtained.

As shown in Table 1, the obtained work cloth has an air permeability difference of 40.4 cc / cm ² / sec when unstretched and stretched, and has good UV shielding performance, stretch rate, and stretch recovery rate. Met.

(Example 2)
Copolymerization component of warp yarn, single covering fiber yarn with 78dTex / 68 filament polyamide fiber yarn as core yarn and 44dTex polyurethane elastic yarn as sheath yarn, and 84dTex / 24 filament 5-sodium sulfoisophthalic acid The easily alkali-soluble polyester fiber yarns were alternately arranged at a ratio of 12: 2 respectively. Copolymerized with a single covering fiber yarn using a 78dTex / 68 filament polyamide fiber yarn as a sheath yarn and a 22dTex polyurethane elastic yarn as a core yarn, and 84dTex / 24 filament 5-sodium sulfoisophthalic acid. Weaving fabric with easy alkali-soluble polyester fiber yarns as components, alternately arranged at a ratio of 10: 3, with a warp density of 104 / 2.54 cm and a horizontal density of 75 / 2.54 cm did.
Next, after scouring, drying and intermediate setting according to a conventional method, treatment in a bath was carried out at a temperature of 90 ° C. for 10 minutes in a 3% aqueous sodium hydroxide solution to completely dissolve the easily soluble polyester fiber. .
After that, dyeing, drying and finishing set are performed according to a conventional method, and the vertical density is 145 / 2.54 cm, the horizontal density is 131 / 2.54 cm, and no clear voids can be confirmed with the naked eye when not stretched. Air permeability is 4.4 cc / cm ² / sec, the air permeability when stretched by 20% is 40.2 cc / cm ² / sec, the air permeability when stretched by 20% is 61.3 cc / cm ² / sec A processed cloth having a rate of 30.5% in the vertical direction, 40.2% in the horizontal direction, a recovery rate of 96.6% in the vertical direction, 98.8% in the horizontal direction, and a UPF rating of 50+ when not stretched was obtained.

As shown in Table 1, the obtained work cloth has an air permeability difference of 35.8 cc / cm ² / sec when unstretched and stretched, and has good UV shielding performance, stretch rate, and stretch recovery rate. Met.

(Example 3)
A single covering fiber yarn using a 78dTex / 68 filament polyamide fiber yarn as a sheath yarn and a 44dTex polyurethane elastic yarn as a core yarn is arranged on the warp yarn at intervals of 12 warp wings. did. Co-polymerized with 84dTex / 24 filaments of 5-sodium sulfoisophthalic acid, which is made of weft yarn with 78dTex / 68 filament polyamide fiber yarn as sheath yarn and 44dTex polyurethane elastic yarn single covering fiber yarn as core yarn Weaving fabric with easy alkali-soluble polyester fiber yarns as components, alternately arranged in a ratio of 10: 3, with a warp density of 120 / 2.54 cm and a weft density of 80 / 2.54 cm did.
Next, after scouring, drying and intermediate setting according to a conventional method, treatment in a bath was performed in a 3% aqueous sodium hydroxide solution at a temperature of 90 ° C. for 10 minutes to completely dissolve the easily alkali-soluble polyester fiber.
After that, dyeing, drying and finishing set were performed according to a conventional method, and the vertical density was 172 / 2.54 cm, the horizontal density was 128 / 2.54 cm, and no clear voids could be confirmed with the naked eye when not stretched. Air permeability is 9.1 cc / cm ² / sec, air permeability when stretched by 20% is 31.0 cc / cm ² / sec, air permeability when stretched by 20% is 41.1 cc / cm ² / sec, stretched A processed cloth having a vertical ratio of 25.0%, horizontal width of 28.0%, elongation recovery rate of vertical length of 95.2%, horizontal width of 96.8%, and UPF rating when not stretched was 50+ was obtained.

As shown in Table 1, the obtained work cloth has an air permeability difference of 21.9 cc / cm ² / sec when unstretched and stretched, and has good UV shielding performance, stretch rate, and stretch recovery rate. Met.
(Comparative Example 1)
A single covering fiber yarn having a 78 dTex / 68 filament polyamide fiber yarn as a sheath yarn and a 44 dTex polyurethane elastic yarn as a core yarn was used as the warp yarn. A single covering fiber yarn having a 78dTex / 68 filament polyamide fiber yarn as a sheath yarn and a 22dTex polyurethane elastic yarn as a core yarn is used as the weft yarn. The warp density is 120 yarns / 2.54cm. Weaved 80 woven fabrics / 2.54 cm.
Next, scouring, drying and intermediate setting, dyeing, drying and finishing set are performed according to a conventional method, and the vertical density is 172 / 2.54 cm, the horizontal density is 128 / 2.54 cm, and the clear gap is not visible when unstretched. The air permeability when not stretched is 4.2 cc / cm ² / sec, the air permeability when stretched by 20% is 8.8 cc / cm ² / sec, and the breathability when stretched by 20% is 10. 5cc / cm ² / sec, stretch rate is 22.5%, width is 25.3%, stretch recovery rate is 95.1%, width is 96.7%, and UPF rating is 50+ when not stretched. Obtained.
As shown in Table 1, the obtained work cloth has good UV shielding performance, elongation rate, and elongation recovery rate, but the difference in air permeability between unstretched and stretched is 4.6 cc / cm ² / sec. It was very small.

Claims (10)

In a woven fabric using polyurethane elastic fibers, the air permeability when not stretched, measured by the method A (fragile type) described in JIS L1096: 2010, the air permeability when stretched by 20% in either the vertical or horizontal direction, or both Has a difference of 20 cc / cm ² / sec or more. The breathable stretch fabric according to claim 1, wherein the air permeability when not stretched is 30 cc / cm ² / sec or less. The breathable variable stretch fabric according to claim 1 or 2, wherein the breathability when stretched by 20% in one or both of the vertical and horizontal directions is 40 cc / cm ² / sec or more. The breathable variable stretch fabric according to any one of claims 1 to 3, wherein a blending ratio of the polyurethane elastic fibers is 5% by weight or more with respect to the entire fabric. The breathable variable stretch fabric according to any one of claims 1 to 4, wherein the unstretched fabric has an ultraviolet shielding effect of 30 or more as measured by an UPF rating measured according to Australian / New Zealand Standard 4399. The stretch rate (EMT) in the vertical direction and / or the horizontal direction measured with a KES-FB1-AUT0-A automatic tensile tester (500 cN / cm load) manufactured by Kato Tech is 20% or more and the stretch recovery rate (RT) is It is 80% or more, The ventilation variable stretch fabric in any one of Claims 1-5 characterized by the above-mentioned. 7. The breathable variable stretch fabric according to any one of claims 1 to 6, wherein at least two warp yarns are skipped together and woven with an empty feather structure having an interval of 1 mm or more. 8. The breathable stretch fabric according to any one of claims 1 to 7, wherein a fiber that dissolves in water and / or a solvent is used in a part of the warp yarn and the weft yarn. 9. The breathable stretch fabric according to claim 1, wherein fibers that are completely dissolved together with water or the same solvent are used as part of the warp yarn and the weft yarn. The stretchable woven fabric according to claim 8 or 9, wherein the solvent is an aqueous alkali solution containing sodium hydroxide.