JP6878767B2 - Ventilation variable stretch fabric - Google Patents

Description

The present invention relates to a stretchable stretch fabric having an ultraviolet shielding property and having excellent stretchability in which the breathability can be reversibly changed.

Conventionally, as a means for greatly improving the air permeability of a woven fabric, the density is controlled by the woven fabric structure, or the weaving is performed by partially using a thread that dissolves in a specific solvent, and the woven fabric is intentionally dissolved in the dyeing process. A technique for making a gap in a solvent (Patent Document 1), a technique for physically drilling a hole by laser punching, etc. have been proposed, and it has become possible to dramatically increase the initial air flow rate. It is possible to effectively release the hot air and moisture from the system to the outside of the system. However, when it is made into clothes and worn by humans, the environment inside the clothes is not constant in various scenes such as immediately after clothes, during exercise, and at rest, and the required breathability is different, in order to provide a comfortable wearing environment. The problem was that variable ventilation performance was required.

For example, in order to obtain reversible ventilation, a swellable conjugate fiber in which a high water swelling component and a low water swelling component are compounded side by side is used, and the air permeability is changed as the humidity inside the clothes rises due to sweating. A method is known (Patent Document 2).
However, when it rains, it absorbs humidity even if it is water-repellent, so even if the humidity inside the clothes is not rising, it may absorb the humidity of the outside air and increase the air permeability. is there.

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

Japanese Unexamined Patent Publication No. 2011-089231 Japanese Unexamined Patent Publication No. 2006-161237 Japanese Unexamined Patent Publication No. 2007-277791

Therefore, an object of the present invention is to stably provide a variable-ventilation stretch woven fabric that suppresses breathability at rest, has variable breathability that increases breathability when the fabric is stretched during exercise, and has high stretchability. To do.

The present invention is intended to solve the above-mentioned problems, and is a woven fabric using polyurethane elastic fibers, in which the air permeability in unstretched state measured by the method A (Frazier type) described in JIS L1096: 2010 is used. It is a breathable variable stretch woven fabric characterized by having a difference of ^{20 cc / cm 2} / sec or more from the air permeability when one or both of the vertical and horizontal directions are extended by 20%.

According to a preferred embodiment 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 embodiment 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 extended by 20%. is there.

According to a preferred embodiment of the woven fabric of the present invention, in the above-mentioned woven fabric, the polyurethane elastic fiber is used in an amount 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 by Australian / New Zealand standard 4399 has an ultraviolet shielding effect of 30 or more when unstretched.
According to a preferred embodiment of the woven fabric of the present invention, the elongation ratio in the vertical direction and / or the horizontal direction measured by the KES-FB1-AUT0-A automatic tensile tester (500 cN / cm load) manufactured by Kato Tech Co., Ltd. EMT) is 20% or more, and the stretch recovery rate (RT) is 80% or more.
According to a preferred embodiment of the woven fabric of the present invention, when the woven fabric is woven, it is a wing structure in which at least two or more adjacent warp yarns are continuously skipped, and the gap between the wing is 1 mm or more.

According to a preferred embodiment of the woven fabric of the present invention, a part of the warp and / or weft yarn of the woven fabric is a woven fabric composed of fibers dissolved in water and / or a specific solvent, and the water and / or the above-mentioned water and / or. Alternatively, the above-mentioned holes, which are dissolved and removed in a specific solvent and penetrated from the front surface to the back surface according to the fineness of the woven fabric when the woven fabric is stretched, and the above-mentioned fineness except for the entangled parts of the fibers. A thread consisting of fibers that are not completely removed by water and / or a specific solvent is substantially present as a portion of only warp threads or only weft threads.
According to a preferred embodiment of the woven fabric of the present invention, fibers that are soluble in water and / or a solvent are used in a part of the warp and weft yarns.

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

According to the garment using the woven fabric of the present invention, the air permeability is temporarily increased during exercise, that is, when the fabric is stretched, and the effect of discharging the hot air in the garment to the outside of the system can be obtained. In addition, since the air permeability is suppressed at rest, that is, at rest, it is possible to maintain heat retention, and it is intended to achieve both a comfortable wearing environment during exercise and at rest. This makes it possible to provide a comfortable and safe wearing environment.

The woven fabric of the present invention is a woven fabric using the polyurethane elastic fibers as described above, and is preferably a woven fabric using a covering yarn in which polyurethane elastic fibers are arranged as a core yarn and synthetic fibers are arranged as a sheath yarn.
The woven fabric of the present invention has 20 cc / cm when the air permeability measured by the method A (Frazier type) described in JIS L1096: 2010 is unstretched and when one or both of the vertical and horizontal directions are stretched by 20%. ² / sec or more difference, preferably has the feature that 30 cc / cm ² / sec or more differences, more preferably have a difference of more than 40 cc / cm ² / sec, a breathable variable stretch fabrics.

As a result of diligent studies on the above-mentioned problem, that is, a woven fabric having a remarkably large change in air permeability during non-stretching and stretching, the present invention results in a woven fabric using polyurethane elastic fibers for two or more adjacent warp yarns. A woven fabric with a space between the wings and a space of 1 mm or more between the wings is used, or a part of the warp yarn and a part of the weft yarn are treated with fibers that can be dissolved and removed with water or a specific solvent. It has been clarified that variable air permeability can be imparted to the woven fabric by using the woven fabric.

Above all, by using a covering yarn in which elastic fibers are used as core yarns and synthetic fibers or the like are used as sheath yarns, the covering yarns are sufficiently contracted during the processing process, and there are no voids in the finished state in the unstretched state, but the yarns are stretched. Occasionally the voids can be manifested and variable breathability can be imparted.

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 as a part of the warp yarn and / or the weft yarn of the woven fabric is preferably used.
As the sheath yarn, various synthetic fibers such as polyamide-based such as nylon 6, nylon 66 and nylon 610, polyester-based, polyacrylic-based, polypropylene-based and polyvinyl chloride-based, and semi-synthetic fibers such as acetate and rayon are preferable. Used for.

As the form of the sheath yarn, a continuous multifilament yarn composed of a plurality of single fibers is preferable. It is also possible to use a single fiber having a uniform cross section in the length direction or having a thick and thin cross section, and the cross section shape is round, triangular, Y-shaped, X-shaped, eight-leafed, hollow, and flat. A fixed form can also be used. The mixing ratio of the polyurethane elastic fibers 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 voids.

The polyurethane polymer constituting the polyurethane elastic fiber may be a polyurethane-urea copolymer, or may be 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 consisting of a long molecular chain, and the hard segment is a relatively short chain derived by the reaction of an organic isocyanate with a diamine chain extender or a diol chain extender. It is preferably composed of the segments of.
Depending on the intended use, the above-mentioned synthetic fibers and polyurethane polymers include ultraviolet absorbers such as benzotriazoles, antioxidants such as hindered phenols, various pigments such as titanium oxide and iron oxide, barium sulfate, zinc oxide, and oxidation. A lubricant typified by metal soap, such as a functional additive containing cesium, calcium carbonate, silver ions, etc., may be contained.

Covering yarns include single-covered yarn in which other fibers are wound around the polyurethane elastic fiber in a single layer, double-covered yarn in which other fibers are wound around the polyurethane elastic fiber in a double-twisted and upper-twisted manner, and polyurethane elastic fiber. Twisted yarns in which and other fibers are twisted together, air-covered yarns in which polyurethane elastic fibers and other fibers are simultaneously interlaced and have entangled parts and open fiber parts alternately are mentioned. In the present invention, there are applications, costs, and weaving. Single-covered yarn is preferably used because of its properties.

In the present invention, the fibers dissolved in water or a specific solvent used for a part of the warp yarn and a part of the weft yarn include, for example, water-soluble fibers such as polyvinyl alcohol-based fibers, isophthalic acid, and 5-sodium sulfoisophthal. Polyester-based fibers in which a third component such as acid and metoxypolyoxyethylene glycol are copolymerized, and easily alkali-soluble fibers such as polylactic acid-based fibers can be used. In addition, these can be used alone or as a composite of two or more kinds. When these are used alone, they can be used by arranging two or more of them in the form of arranging, pulling, synthesizing and twisting.
The total fineness of the yarn made of the melted fibers is preferably 33 dTex or more and 150 dTex or less because the fibers are melted and holes penetrating from the front surface to the back surface of the woven fabric are formed during elongation. If the total fineness is less than 33 dTex, the air permeability during elongation may be inferior, and if the total fineness is larger than 150 dTex, the air permeability during extension is good, but the ultraviolet shielding property and the eye contact tend to be inferior.

In addition, the area of the hole penetrating from the front surface to the back surface of the woven fabric is closed to the extent that the size cannot be specified when it is not stretched, and it is 1 × 10 when it is stretched 20% vertically or horizontally, or when it is stretched 20% vertically and horizontally. It is preferably ^-2 mm ² or more and 2.5 × 10 ^-1 mm ^{2 or less.} If the hole size is ^{smaller than 1 x 10 -2} mm ² , the air permeability tends to ^{be inferior, and if it is larger than 2.5 x 10 -1} mm ² , the air permeability is good, but the UV shielding property and the eye contact are inferior. 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.

Further, the vertical / horizontal ratio of the holes penetrating from the front surface to the back surface of the woven fabric, which appears when the woven fabric is 20% elongated vertically or horizontally, is preferably 3: 1 to 1: 3. If the vertical / horizontal ratio deviates from the ratio of 3: 1 to 1: 3, when it is generally used as clothing, it tends to be inferior in physical properties such as frayed fabric edges and slip resistance, and the appearance of the fabric also tends to be distorted. It may be easier to do. The vertical / horizontal ratio of the holes is more preferably a ratio of 2: 1 to 1: 2 from the viewpoint of being able to design a stable fabric.
It is important that ^{the woven fabric of the present invention has an air permeability difference of 20 cc / cm 2} · sec or more when it is not stretched and when it is stretched 20% vertically or horizontally, or when it is stretched 20% vertically and horizontally.
From the literature on the skin elongation of the human body, the horizontal / vertical elongation of the upper shoulder is 3.6% / 17.6%, the horizontal / vertical elongation of the shoulder is 18.1% / 9.2%, and the posterior elbow Model measurement of horizontal / vertical elongation 30.0% / 38.0%, buttock horizontal / vertical elongation 8.2% / 36.4%, patella horizontal / vertical elongation 15.6% / 36.8% There are results. Actually, the stretch of clothes differs depending on the movement because the design of the clothes and the amount of room are various, but it is said that it is difficult to make clothes with a sharp silhouette and easy movement unless the fabric stretches by 20% or more.
Further, the difference in air permeability ^{is preferably 100 cc / cm 2} · sec or less.
Further, it is preferable that the air permeability when not stretched is 30 cc / cm ² · sec or less. If the air permeability ^{exceeds 30 cc / cm 2} · sec, ventilation will be facilitated inside and outside the clothes, and as a result, the heat retention effect will be reduced. The air permeability when unstretched is more preferably 20 cc / cm ² · sec or less, and further preferably 10 cc / cm ² · sec or less. The above-mentioned breathability is determined by examining the number and spacing of vacant wing structures, examining the fineness of fibers dissolved in water and / or a specific solvent, and arranging them by design, and polyurethane that allows sufficient shrinkage during the processing process. It can be controlled by using an elastic thread or the like. ^{The air permeability when not stretched is preferably 1 cc / cm 2} · sec or more from the viewpoint of heat retention during non-exercise.
For the woven fabric of the present invention, when the air permeability when one or both of the vertical and horizontal directions are extended by 20% is 40 cc / cm ² / sec or more, the moisture in the clothes during exercise is discharged to the outside 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 sudden discharge.
It is preferable that the woven fabric of the present invention has an ultraviolet shielding effect having an UPF evaluation of 30 or more measured according to Australian / New Zealand standard 4399 in an unstretched state.
If the UPF evaluation is less than 30, the result is a design in which the fabric has large voids or a low density, resulting in a woven fabric having poor heat retention. In the above UPF evaluation, the number and spacing of vacant wing structures are examined, the fineness of fibers dissolved in water and / or a specific solvent is examined, and the arrangement by design is examined, and polyurethane that sufficiently shrinks during the processing process is obtained. It can be controlled by using an elastic thread or the like. In addition, the UPF evaluation measured by the Australian / New Zealand standard 4399 should have an ultraviolet shielding effect of 50+ or less in terms of comfortable clothing that protects the human body from ultraviolet rays as much as possible.
The woven fabric of the present invention has an elongation rate (EMT) of 20% or more in the vertical direction and / and the horizontal direction measured by a KES-FB1-AUT0-A automatic tensile tester (500 cN / cm load) manufactured by Kato Tech Co., Ltd. and stretches. It is preferable that the woven fabric has a recovery rate (RT) of 80% or more.
By setting the elongation rate to 20% or more, it is possible to make clothes that have a sharp silhouette and are easy to move as described above. The elongation rate and the elongation recovery rate can be controlled by adjusting the draft rate of the polyurethane elastic yarn. If the elongation rate is less than 20%, a comfortable wearing environment may be restricted for applications with a large amount of exercise such as sports clothing. The elongation rate is preferably 50% or less in terms of shape retention of clothes.
If it is lower than the above-mentioned extension recovery rate, the wearing durability may be inferior due to elbow omission and knee omission. The elongation recovery rate is preferably a value close to 100%.
Next, the method for producing the woven fabric of the present invention will be described.
As a method for producing a woven fabric of the present invention, a wing structure in which two or more adjacent warp yarns are spaced apart from each other has a gap of 1 mm or more, or a fiber yarn dissolved in water or a specific solvent. Is used for the warp yarn, and the method of dissolving and removing with such water and / or a specific solvent can be mentioned. At that time, by using a fibrous yarn that dissolves in water and / or a specific solvent as a part of the weft yarn, the fibrous yarn is dissolved and removed in water and / or a specific solvent to remove the fibrous yarn as described above. It is possible to make a hole penetrating from the fiber surface to the back surface in the entangled portion with the thread according to the total fineness.

Further, the warp and weft yarns that are dissolved in the same specific solvent are used as a part of the warp and weft yarns to form a woven fabric, and the woven fabric is dissolved and removed in the specific solvent. Can be vacated, which is preferable. The specific solvent in which both the warp and weft threads are dissolved may be water.
A water-soluble fiber (thread) is a water-soluble fiber such as a polyvinyl alcohol-based fiber, and the water-soluble fiber is used for at least one warp yarn and at least one weft yarn, and is dissolved and removed in water. By doing so, a hole penetrating from the front surface to the back surface of the fiber is formed in the entangled portion of the warp and weft threads. As for the warp yarn, a gap may be formed by using an empty feather structure without using the water-soluble fiber. The temperature of the water used is preferably 20 ° C. or higher, but it is preferable to dissolve and remove the water at a temperature of 50 ° C. or higher in order to sufficiently develop the efficiency of dissolution and the crimping of fibers that are not completely dissolved. .. Further, in order to sufficiently develop the crimping of the fibers that are not completely dissolved, it is preferable to treat the hot water bath 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 a solution of alkaline substances such as sodium hydroxide, potassium hydroxide, calcium hydroxide, magnesium hydroxide and sodium carbonate for polyester fibers and polylactic acid fibers which are easily alkaline-soluble fibers. Therefore, it is a preferable embodiment to use it as an alkaline aqueous solution. In particular, it is preferably an alkaline aqueous solution containing sodium hydroxide, and the temperature of the alkaline aqueous solution in the bath is preferably 50 ° C. or higher for dissolution and removal. Further, in order to sufficiently develop the crimping of the fibers that are not completely dissolved, it is preferable to carry out the 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.

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

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

The textile of the present invention can be used as clothing such as sportswear, homewear, coats, blouson, blouses, shirts, skirts, slacks, indoor athletic wear, pajamas, sleepwear, underwear, office wear, work clothes, food lab coats, nursing lab coats, etc. It is preferably used as patient clothes, nursing clothes, school clothes, kitchen clothes and the like. It is also used as miscellaneous goods such as aprons, towels, gloves, mufflers, socks, hats, shoes, sandals, and bags. Further, as interior goods, it is preferably used for curtains, kotatsu covers, sofa covers, cushion covers, sofa side areas, table cloths and the like. Further, as bedding products, it is preferably used for bedding side materials, sheets, duvet covers, pillowcases and the like.

Next, the woven fabric of the present invention will be described more specifically by way of examples. The following methods were used as various evaluation methods in the examples.
(Breathability)
^{The amount of air (cc / cm 2} · sec) passing through the test piece was determined using a Frazier type tester by the method specified in JIS-L1096: 2010 Breathability A method (Frazil type method).
(UPF evaluation)
Irradiate the test piece with a spectrophotometer or spectrophotometer at 280 nm to 400 nm by the method specified by Australian / New Zealand standard 4399, measure the transmittance, calculate the UPF value, and measure at least 4 times. The average was taken as the UPF value.
(Elongation)
A method of measuring with a KES-FB1-AUT0-A automatic tensile tester manufactured by Kato Tech Co., Ltd., with a grip width of 20 cm, a grip interval of 5 cm, a tensile speed of 0.2 mm / sec, and an elongation rate EMT (%) under a load of 500 cN / cm. Asked.

(Elongation recovery rate)
A method of measuring with a KES-FB1-AUT0-A automatic tensile tester manufactured by Kato Tech Co., Ltd., with a grip width of 20 cm, a grip interval of 5 cm, a speed of 0.2 mm / sec, and a recovery rate RT (%) from hysteresis of a maximum load of 500 cN / cm. ) Was asked.
(Mixing rate)
The mixing ratio was determined based on the JIS-L1030-2: 2012 textile product mixing ratio test method.

(Example 1)
Copolymerization of single covering fiber yarn with 78dTex / 68 filament polyamide fiber yarn as sheath yarn and 44dTex polyurethane elastic yarn as core yarn and 84dTex / 24 filament 5-sodium sulfoisophthalic acid in the warp yarn. The easily alkaline-soluble polyester fiber threads used as the components were alternately arranged at a ratio of 12 threads to 2 threads, respectively. Copolymerization of single covering fiber yarn with 78dTex / 68 filament polyamide fiber yarn as sheath yarn and 44dTex polyurethane elastic yarn as core yarn and 84dTex / 24 filament 5-sodium sulfoisophthalic acid in weft Easily alkaline-soluble polyester fiber yarns used as ingredients are arranged alternately at a ratio of 10 yarns: 3 yarns, and the vertical density is 120 yarns / 2.54 cm and the horizontal density is 80 yarns / 2.54 cm. Was woven.
Next, after scouring, drying and intermediate setting according to a conventional method, a bath treatment was carried out at a temperature of 90 ° C. for 10 minutes in an aqueous sodium hydroxide solution having a concentration of 3% 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 lines / 2.54 cm, the horizontal density was 128 lines / 2.54 cm. 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 rate of 25.0% in length and 28.0% in width, a recovery rate of elongation of 95.2% in length and 96.8% in width, and an UPF evaluation of 50+ when not stretched was obtained.

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

(Example 2)
A copolymerization component of a single covering fiber yarn having 78dTex / 68 filament polyamide fiber yarn as a core yarn and 44dTex polyurethane elastic yarn as a sheath yarn and 84dTex / 24 filament 5-sodium sulfoisophthalic acid in the warp yarn. The easily alkaline-soluble polyester fiber yarns were arranged alternately at a ratio of 12 yarns: 2 yarns, respectively. Copolymerization of single covering fiber yarn with 78dTex / 68 filament polyamide fiber yarn as sheath yarn and 22dTex polyurethane elastic yarn as core yarn and 84dTex / 24 filament 5-sodium sulfoisophthalic acid on weft yarn. Easily alkaline-soluble polyester fiber yarns as ingredients are arranged alternately at a ratio of 10 yarns: 3 yarns, and a woven fabric with a vertical density of 104 yarns / 2.54 cm and a horizontal density of 75 yarns / 2.54 cm is woven. did.
Next, after scouring, drying and intermediate setting according to a conventional method, a bath treatment was carried out at a temperature of 90 ° C. for 10 minutes in an aqueous sodium hydroxide solution having a concentration of 3% 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 145 lines / 2.54 cm, the horizontal density was 131 lines / 2.54 cm, and clear voids could not be confirmed with the naked eye when unstretched. The air permeability is 4.4 cc / cm ² / sec, the air permeability when the horizontal 20% is extended is 40.2 cc / cm ² / sec, and the air permeability when the vertical ^{and horizontal 20% is extended is 61.3 cc / cm 2} / sec. A processed cloth having a vertical rate of 30.5% and a horizontal rate of 40.2%, a stretch recovery rate of 96.6% and a horizontal line of 98.8%, and an UPF evaluation of 50+ when not stretched was obtained.

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

(Example 3)
Single covering fiber yarns with 78dTex / 68 filament polyamide fiber yarns as sheath yarns and 44dTex polyurethane elastic yarns as core yarns are arranged on the warp yarns at intervals of 12 empty feathers for 3 warp yarns. did. Copolymerization of 84dTex / 24 filament 5-sodium sulfoisophthalic acid with 78dTex / 68 filament polyamide fiber yarn as the sheath yarn and 44dTex polyurethane elastic yarn as the core yarn as the weft yarn. Easily alkaline-soluble polyester fiber yarns as ingredients are arranged alternately at a ratio of 10 yarns: 3 yarns, and a woven fabric with a vertical density of 120 yarns / 2.54 cm and a horizontal density of 80 yarns / 2.54 cm is woven. 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 alkali-soluble polyester fiber.
After that, dyeing, drying and finishing set were performed according to a conventional method, and the vertical density was 172 lines / 2.54 cm, the horizontal density was 128 lines / 2.54 cm. The air permeability is 9.1 cc / cm ² / sec, the air permeability when the horizontal 20% is extended is 31.0 cc / cm ² / sec, and the air permeability when the vertical ^{and horizontal 20% is extended is 41.1 cc / cm 2} / sec. A processed cloth having a rate of 25.0% in length and 28.0% in width, a recovery rate of elongation of 95.2% in length and 96.8% in width, and an UPF evaluation of 50+ when not stretched was obtained.

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

Claims (5)

In a woven fabric using polyurethane elastic fibers, the woven fabric is one in which at least two warp yarns are skipped together and woven with an air feather structure having an interval of 1 mm or more, or one of the warp yarns and the weft yarns. It is obtained by dissolving the fiber in water or the same solvent after making a woven fabric by using a fiber that dissolves in water and / or the same solvent in the part, and is obtained by dissolving the fiber in water or the same solvent. and air permeability of at unstretched measured in the form), one of the longitudinal or transverse direction, or both and the air permeability upon elongation was 20% have a difference of more than 20cc / cm ² / sec, further unextended air permeability when is not more than 20 cc / cm ² / sec, aeration variable that UPF rating measured in Australia / New Zealand standard 4399 the fabric of unstretched state is characterized Rukoto to have a 30 or more ultraviolet shielding effect Sex stretch fabric. The vertical or one lateral direction, or claim 1 Symbol placement breathable variable stretch fabrics air permeability upon elongation was 20% both, characterized in that at 40cc / cm ² / sec or more. The air-permeable stretch woven fabric according to claim 1 or 2 , wherein the mixing ratio of the polyurethane elastic fibers is 5% by weight or more with respect to the entire woven fabric. The elongation rate (EMT) in the vertical and / or horizontal directions measured by the KES-FB1-AUT0-A automatic tensile tester (500 cN / cm load) manufactured by Kato Tech is 20% or more, and the extension recovery rate (RT) is The air-permeable stretch fabric according to any one of claims 1 to 3 , wherein the content is 80% or more. The air-permeable stretch woven fabric according to claim 1 , wherein the solvent is an alkaline aqueous solution containing sodium hydroxide .