JP5996915B2 - Shoes and shoes - Google Patents

Description

  The present invention relates to a shoe material having improved air permeability when wet and a shoe using the shoe material.

Conventionally, as a shoe material, natural fibers such as natural leather, synthetic leather, and cotton, synthetic fibers, and composite materials thereof are mainly used depending on the use of shoes (for example, Patent Document 1 and Patent Document 2). reference).
For example, natural leather is often used for gentlemen and women, and synthetic fibers are used for sports such as jogging shoes and casual shoes for adults and children.

  However, the shoe material using natural fibers has a problem that it is excellent in water absorption but inferior in quick drying. In addition, the shoe material using synthetic fibers is excellent in quick-drying, but has extremely poor water absorption and frictional force. However, the shoe material itself hardly absorbs sweat, causing discomfort due to foot stuffiness, and problems that the foot slips in the shoe during exercise.

JP 2001-340102 A JP 2010-104575 A

  The present invention has been made in view of the above background, and an object of the present invention is to provide a shoe material having improved breathability when wet and a shoe using the shoe material.

  As a result of intensive studies to achieve the above-mentioned problems, the present inventors have found that when a shoe material is formed using a fabric containing a crimped fiber A that has a reduced crimp rate when wet, the shoe material has improved breathability when wet. The present invention has been completed by finding out that it can be obtained and by further intensive studies.

Thus, according to the present invention, “a crimped fiber A that is used as a member of a shoe and has a reduced crimp rate when wet, and a fiber B that is a non-crimped fiber or a crimped fiber whose crimp rate does not change when wet” A change rate of air permeability defined by the following formula in the fabric is 5% or more, and the fabric has a three-layer structure weave and knitting structure, and the three-layer structure weave At least one of the outermost layers of the knitted structure is a mesh structure, and the crimped fibers A and fibers B are arranged in stripes on the intermediate layer of the three-layer structure woven knitted structure. A shoe material characterized in that the surface has irregularities is provided.
Percent change in air permeability (%) = ((air permeability when wet) − (air permeability when dry)) / (air permeability when dry) × 100

  The crimped fiber A is preferably a composite fiber in which a polyester component and a polyamide component are joined in a side-by-side manner. In that case, it is preferable that the said polyester component consists of a modified polyester by which 2.0-4.5 mol% 5-sodium sulfo isophthalic acid was copolymerized. Moreover, it is preferable that the said fabric is comprised with the said crimped fiber A and the fiber B which is a crimped fiber which does not change a crimp rate when it is a non-crimped fiber or when wet.

Oite shoes material of the present invention, it is preferable that arranged in stripes on at least one of the outermost layer of the crimped fibers A and B are three-layer structure woven or knitted fabric.
In the shoe material of the present invention, the thickness of the fabric is preferably in the range of 1 to 5 mm. Moreover, it is preferable that the fabric weight is in the range of 200 to 500 g / m ² .
Moreover, according to this invention, the shoes using the said shoe material are provided.

  According to the present invention, a shoe material having improved breathability when wet and a shoe using the shoe material are obtained.

Hereinafter, embodiments of the present invention will be described in detail.
The shoe material of the present invention includes a fabric containing a crimped fiber A that reduces the crimp rate when wet. By including the fabric of the shoe material, the breathability of the shoe material is improved when wet.
Here, in the crimped fiber A, the difference between the crimp rate DC during drying and the crimp rate HC during wetness (DC-HC) is 0.5% or more as measured by the following method. Is preferred.

That is, after the fabric is left in an atmosphere of a temperature of 20 ° C. and a humidity of 65% RH for 24 hours, a small piece of 30 cm × 30 cm in the same direction as the fabric is cut from the fabric (n number = 5). Subsequently, the fiber is taken out from each piece, and the yarn length L0 is measured by applying a load of 1.76 mN / dtex (200 mg / de), and after 1 minute of dewetting, a load of 0.0176 mN / dtex (2 mg / de) To measure the yarn length L1. Further, the yarn was immersed in water at a temperature of 20 ° C. for 2 hours and then taken out, and then lightly wiped off with a filter paper (size 30 cm × 30 cm) at a pressure of 0.69 mN / cm ² (70 mgf / cm ² ) for 5 seconds. After that, the yarn length L0 ′ was measured by applying a load of 1.76 mN / dtex (200 mg / de), and after 1 minute of dewetting, the yarn length L1 ′ was applied by applying a load of 0.0176 mN / dtex (2 mg / de). Measure. From the above measurement values, the following formulas are used to calculate the crimp rate DC (%) at the time of drying, the crimp rate HC (%) at the time of wetness, and the crimp rate difference between the dry and wet conditions (DC-HC) ( %) Was calculated. In addition, the number of n was 5, and the average value was obtained.
Crimp rate during drying DC (%) = ((L0−L1) / L0) × 100
Crimp rate HC (%) when wet = (L0′−L1 ′) / L0 ′) × 100
The crimped fiber A is preferably a composite fiber composed of a polyester component and a polyamide component, and both components joined in a side-by-side manner.

  As the polyester component, a compound having at least one functional group having an alkali or alkaline earth metal or phosphonium salt of sulfonic acid and having an ester forming ability is used in terms of adhesion to the other polyamide component. Preferred examples thereof include polymerized modified polyesters such as polyethylene terephthalate, polypropylene terephthalate, and polybutylene terephthalate. Among these, modified polyethylene terephthalate obtained by copolymerizing the above compound is particularly preferable from the viewpoint of versatility and polymer cost. In this case, examples of the copolymer component include 5-sodium sulfoisophthalic acid and ester derivatives thereof, 5-phosphonium isophthalic acid and ester derivatives thereof, and sodium p-hydroxybenzenesulfonate. Of these, 5-sodium sulfoisophthalic acid is preferable. As a copolymerization amount, the range of 2.0-4.5 mol% is preferable. When the copolymerization amount is less than 2.0 mol%, although excellent crimping performance can be obtained, there is a possibility that peeling occurs at the bonding interface between the polyamide component and the polyester component. On the other hand, if the copolymerization amount is greater than 4.5 mol%, the crystallization of the polyester component becomes difficult to proceed during the stretching heat treatment, and thus it is necessary to raise the stretching heat treatment temperature. There is a risk.

One polyamide component is not particularly limited as long as it has an amide bond in the main chain, and examples thereof include nylon-4, nylon-6, nylon-66, nylon-46, nylon-12, and the like. can give. Among these, nylon-6 and nylon-66 are preferable in terms of versatility, polymer cost, and yarn production stability.
The polyester component and the polyamide component include known additives such as pigments, pigments, matting agents, antifouling agents, fluorescent whitening agents, flame retardants, stabilizers, antistatic agents, light-resistant agents, and ultraviolet absorption agents. An agent or the like may be included.

  The composite fiber joined to the side-by-side type can take any cross-sectional shape and composite form. For example, it may be a side-by-side type or an eccentric core-sheath type. Furthermore, you may have a hollow part in the triangle, the square, and the cross section. Although the composite ratio of both components can be selected arbitrarily, it is usually in the range of 30:70 to 70:30 (more preferably 40:60 to 60:40) by weight ratio of the polyester component and the polyamide component. It is preferable.

  Although the single yarn fineness and the number of single yarns (number of filaments) of the crimped fiber A are not particularly limited, the single yarn fineness is 1 to 10 dtex (more preferably 2 to 5 dtex), and the number of single yarns is 10 to 200 (more preferably 20 to 20). 100) is preferable.

  A composite fiber in which different types of polymers are joined in a side-by-side manner usually has latent crimping performance, and the latent crimping performance is manifested when subjected to heat treatment such as dyeing as described later. As the crimped structure, it is preferable that the polyamide component is located inside the crimp and the polyester component is located outside the crimp. The composite fiber (crimped fiber A) having such a crimped structure can be easily obtained by the production method described later. When the crimped fiber A has such a crimped structure, the inner polyamide component swells and stretches when wet, and the outer polyester component hardly changes in length, so that the crimp rate decreases. (The apparent length of the crimped fiber A becomes longer.) On the other hand, at the time of drying, the inner polyamide component shrinks and the outer polyester component hardly changes in length, so that the crimp rate increases (the apparent length of the crimped fiber A becomes shorter). Thus, since the crimp rate of the crimped fiber A is reversibly lowered when wet, the porosity of the fabric (shoe material) is increased, and the air permeability is improved.

The air permeability is a value (cc / cm ² / s) measured by JIS L 1096-1998, 6.27.1, A (Fragile type air permeability tester method) and is defined by the following formula. Is preferably 5% or more (preferably 5 to 30%). If the rate of change in air permeability is less than 5%, the problem of stuffiness may occur when sweating.
Percent change in air permeability (%) = ((air permeability when wet) − (air permeability when dry)) / (air permeability when dry) × 100

However, when dry, the sample is left in a 20 ° C., 65% RH environment for 24 hours, while when wet, the sample is immediately immersed in water at 20 ° C. for 2 hours. The state after sandwiching between a pair of filter papers and lightly wiping off water with a pressure of 0.69 mN / cm ² for 5 seconds, and measuring the air permeability (n number = 5), respectively, and calculating the average .

  The crimped fiber A is preferably a non-twisted yarn or a sweet twisted yarn subjected to twisting of 300 T / m or less in order to easily reduce crimp and improve air permeability when wet. In particular, non-twisted yarn is preferable. When a strong twist is imparted like a strong twisted yarn, it is not preferred that crimps are difficult to decrease when wet. It should be noted that interlaced air processing and / or normal false twist crimping may be performed so that the number of entanglements is about 20 to 60 pieces / m.

  In the present invention, the above-described crimped fiber A is included in the fabric constituting the shoe material. At that time, the content of the crimped fiber A contained in the fabric is preferably 10% by weight or more (more preferably 40% by weight or more) with respect to the total weight of the fabric on a weight basis. If the content of the crimped fiber A is less than 10% by weight, the air permeability may not be improved with good performance when wet.

  When the fabric is composed of the above-described crimped fibers A and fibers B that are non-crimped fibers or crimped fibers that do not change the crimp rate when wet, the type of the fibers B is not particularly limited, and polyethylene Polyesters such as tarephthalate, polytrimethylene terephthalate, polybutylene terephthalate, polyamides such as nylon 6 and nylon 66, polyolefins such as polyethylene and polypropylene, acrylic, para-type or meta-type aramid, and their modified synthetic fibers, Natural fiber, recycled fiber, semi-synthetic fiber, etc. can be freely selected. Among these, polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, and the above-mentioned in terms of dimensional stability when wet and compatibility with the above-mentioned composite fibers (mixing property, knitting / weaving property, dyeability) A polyester fiber made of a modified polyester in which a copolymer component is copolymerized is preferable.

  The single yarn fineness and the number of single yarns (number of filaments) of the fiber B are not particularly limited. However, in order to increase the water absorption of the shoe material (fabric) and improve the air permeability when wet, the single yarn fineness is 0.1. It is preferable to be within a range of ˜50 dtex (more preferably 0.5 to 50 dtex) and a single yarn number of 1 to 200 (more preferably 1 to 100). The fiber B may be subjected to interlaced air processing and / or normal false twist crimping so that the number of entanglements is about 20 to 60 pieces / m.

In the present invention, “the crimping rate does not change when wet” means the difference between the crimping rate DC during drying and the crimping rate HC during wetness (DC−HC) as measured by the method described above. Is less than 0.5% (preferably 0%).
The crimped fiber A and the fiber B may each constitute a fabric with a single yarn, or as a composite yarn such as an air-mixed yarn, a mixed twisted yarn, a composite false twisted crimped yarn, or an aligned yarn. You may comprise a fabric.

  In the present invention, the woven / knitted structure and the number of layers of the fabric structure are not particularly limited, and may be a nonwoven fabric, a woven fabric, or a knitted fabric. For example, woven fabrics having a woven structure such as plain weave, twill weave, and satin, and knitted fabrics having a knitted structure such as tenji, smooth, milling, kanoko, knitting yarn, denby, and half are preferably exemplified, but are not limited thereto. It is not something. The number of layers may be a single layer or a multilayer of two or more layers. Among them, the fabric is a woven or knitted fabric having a three-layered woven or knitted structure (particularly preferably) composed of outermost layers (ground texture portions) on the front and back sides and an intermediate layer (connecting yarn) connecting these ground texture portions. Double raschel knitted fabrics) are preferred because they not only improve air permeability when wet, but also add cushioning properties to the fabric (shoe material). In particular, it is preferable to provide a fiber B made of a monofilament (preferably a polyester monofilament) having a fineness of 30 to 50 dtex in the intermediate layer (binding yarn) because particularly excellent cushioning properties can be obtained. In addition, it is preferable that the outermost layer of at least one of the three-layer woven or knitted structure has a mesh structure because air permeability is improved.

When the crimped fiber A is arranged in an intermediate layer, the crimped fiber A and the fiber B are unevenly formed on the surface of the shoe material when wet if the crimped fiber A and the fiber B are arranged in a stripe shape in the intermediate layer of the three-layer structure woven / knitted structure It is preferable that the contact area with the foot is reduced and the feeling of stuffiness is reduced.
At that time, if the width of the region where the crimped fiber A constitutes the intermediate layer is 2 to 20 mm and the width of the region where the fiber B constitutes the intermediate layer is 2 to 20 mm, the surface of the shoe material when wet It is preferable that unevenness with an appropriate difference in size is developed, and the contact area with the foot is reduced to reduce the feeling of stuffiness.

Moreover, when the said crimped fiber A is distribute | arranged to the outermost layer of at least any one of 3 layer structure woven / knitted fabric, it is preferable that the said crimped fiber A and the fiber B are distribute | arranged to stripe form.
At that time, if the width of the region in which the crimped fiber A constitutes the outermost layer is 2 to 20 mm and the width of the region in which the fiber B constitutes the outermost layer is 2 to 20 mm, The air permeability can be improved while maintaining the dimensions of

  In the present invention, the thickness of the fabric is preferably in the range of 1 to 5 mm in terms of excellent cushioning properties and light weight. If the thickness is less than 1 mm, cushioning properties may be impaired. Conversely, when the thickness is greater than 5 mm, the lightness may be impaired.

Moreover, in this invention, it is preferable that the fabric weight of a fabric exists in the range of 200-500 g / m < ² >. If the basis weight is smaller than 200 g / m ² , cushioning properties may be impaired. Conversely, if the basis weight is larger than 500 g / m ² , the lightness may be impaired.

The shoe material of the present invention can be manufactured, for example, by the following manufacturing method.
First, a modified polyester having an intrinsic viscosity of 0.30 to 0.43 (measured at 35 ° C. using orthochlorophenol as a solvent) and 2.0 to 4.5 mol% of 5-sodium sulfoisophthalic acid copolymerized; Using a polyamide having an intrinsic viscosity of 1.0 to 1.4 (measured at 30 ° C. using m-cresol as a solvent), melt composite spinning is performed in a side-by-side manner. In that case, it is preferable that the intrinsic viscosity of a polyester component is 0.43 or less. When the intrinsic viscosity of the polyester component is larger than 0.43, the viscosity of the polyester component increases, so that the physical properties of the composite fiber are close to those of a single polyester yarn, and the shoe material intended by the present invention may not be obtained. . On the other hand, if the intrinsic viscosity of the polyester component is less than 0.30, the melt viscosity becomes too small and the yarn-making property is lowered and the generation of fluff is increased, which may reduce the quality and productivity.

  As the spinneret used for melt spinning, as shown in FIG. 1 of JP-A-2000-144518, the high-viscosity side and low-viscosity side discharge holes are separated and the high-viscosity side discharge linear velocity is reduced ( A spinneret having a large discharge cross-sectional area is preferred. Then, it is preferable that the molten polyester is passed through the high viscosity side discharge holes and the molten polyamide is passed through the low viscosity side discharge holes to be cooled and solidified. In that case, it is preferable that the weight ratio of a polyester component and a polyamide component exists in the range of 30: 70-70: 30 (more preferably 40: 60-60: 40) as above-mentioned.

  Further, after the melt composite spinning, a separate stretching method in which the film is once wound and then stretched may be employed, or a direct stretching method in which a stretching heat treatment is performed without winding once may be employed. At that time, the spinning and drawing conditions may be normal conditions. For example, in the case of the direct extension method, after spinning at about 1000 to 3500 m / min, the film is continuously drawn and wound at a temperature of 100 to 150 ° C. The draw ratio is preferably appropriately selected so that the cut elongation of the composite fiber obtained at the end is 10 to 60% (preferably 20 to 45%) and the cut strength is about 3.0 to 4.7 cN / dtex. .

  Next, the composite fiber is used alone, or other fibers B are used at the same time to fabricate a fabric such as a woven or knitted fabric to obtain a fabric, and then the crimp of the composite fiber is expressed by a heat treatment such as a dyeing process. To crimped fiber A. The woven or knitted structure is not particularly limited, and the above-described one can be appropriately selected.

  The dyeing temperature is preferably 100 to 140 ° C. (more preferably 110 to 135 ° C.), and the time is preferably the top temperature keeping time within a range of 5 to 40 minutes. By subjecting the fabric to a dyeing process under such conditions, the composite fiber develops crimps due to a difference in thermal shrinkage between the polyester component and the polyamide component, and becomes a crimped fiber A. At that time, by selecting the above-mentioned polymer as the polyester component and the polyamide component, a crimped structure is obtained in which the polyamide component is located inside the crimp.

  The fabric subjected to the dyeing process is usually subjected to a dry heat final set. At that time, the temperature of the dry heat final set is preferably 120 to 200 ° C. (more preferably 140 to 180 ° C.), and the time is preferably within a range of 1 to 3 minutes. When the temperature of the dry heat final set is lower than 120 ° C., wrinkles generated during the dyeing process are likely to remain, and the dimensional stability of the finished product may be deteriorated. On the other hand, if the temperature of the dry heat final set is higher than 200 ° C., the crimp of the composite fiber developed during the dyeing process may be reduced, or the fiber may be cured and the texture of the shoe material may be hardened.

Moreover, you may give a water absorption process to this fabric. By subjecting the fabric to water absorption, the air permeability is easily improved even with a small amount of sweat. Such water-absorbing processing is not particularly limited, and a water-absorbing processing agent such as polyethylene glycol diacrylate or a derivative thereof, or polyethylene terephthalate-polyethylene glycol copolymer is applied to the fabric in an amount of 0.25 to 0.50 based on the weight of the fabric. Preferably it is made to adhere by weight%. Examples of water-absorbing processing include processing in a bath where a water-absorbing agent is mixed with the dyeing solution during dyeing processing, or dipping shoe materials (woven or knitted fabric) into the water-absorbing processing solution and squeezing with a mangle before the dry heat final set. Examples thereof include processing methods such as coating methods, gravure coating methods, and screen printing methods.
In addition to the above-mentioned processing, such fabrics are provided with functions such as conventional brushing processing, ultraviolet shielding or antibacterial agents, deodorants, insect repellents, phosphorescent agents, retroreflective agents, negative ion generators, water repellents, etc. Various processings may be additionally applied.

The shoe material of the present invention uses the above-mentioned fabric. At that time, the shoe material may be composed of only the above-mentioned fabric, or may be combined with another fabric, or an ornament or the like may be appropriately added to the above-mentioned fabric, or may be sewn and used as the shoe material.
In the shoe material thus obtained, the crimped rate of the crimped fiber A contained in the fabric is reduced with good performance when wet, so that the apparent length of the crimped fiber A is increased. As a result, the shoe material (fabric) The air gap becomes larger and the air permeability is improved. On the other hand, the crimped ratio of the crimped fiber A is increased during drying, so that the apparent length of the crimped fiber A is shortened. As a result, the breathability of the shoe material (fabric) is lowered.

  Next, a shoe of the present invention is a shoe using the above-mentioned shoe material. Such shoes include all shoes, shoes and footwear, and include athletic shoes, business shoes, women's shoes, high heels, school shoes, indoor shoes, slippers, sandals and the like. Since such a shoe uses the above-mentioned shoe material, the breathability is improved when wet and the feeling of stuffiness can be reduced.

  EXAMPLES Hereinafter, although an Example is given and this invention is demonstrated in detail, this invention is not limited at all by these. In addition, each physical property in an Example is measured with the following method.

(1) Intrinsic viscosity of polyester Measured at 35 ° C. using orthochlorophenol as a solvent.

(2) Intrinsic viscosity of polyamide Measured at 30 ° C. using m-cresol as a solvent.

(3) Breaking strength, breaking elongation After leaving a fiber sample in a room maintained at a constant temperature and humidity of an atmospheric temperature of 25 ° C. and a humidity of 60% RH for a day and night, a tensile test made by Shimadzu Corporation with a sample length of 100 mm It was set on a machine tensilon, stretched at a speed of 200 mm / min, and the strength at break (cN / dtex) and elongation (%) were measured. In addition, the average value was calculated | required by n number 5.

(4) Boiling water shrinkage The boiling water shrinkage (hot water shrinkage) (%) was measured by the method defined in JIS L 1013-1998, 7.15. In addition, the average value was calculated | required by n number 3.

(5) Crimp rate of the composite fiber before the knitting process Frame circumference: Using a rewind frame of 1.125 m, load: 49/50 mN × 9 × total tex (0.1 gf × total denier), constant speed Rewind and make a small number of 10 turns. Twist the small piece into a double ring shape and apply an initial load of 49/2500 mN x 20 x 9 x total tex (2 mg x 20 x total denier) It was placed in boiling water for 30 minutes, and after the boiling water treatment, it was dried in a dryer at 100 ° C. for 30 minutes. Thereafter, it was further placed in dry heat at 160 ° C. for 5 minutes with the initial load applied. After the dry heat treatment, the initial load was removed and the sample was allowed to stand for 24 hours or more in a temperature of 20 ° C. and a humidity of 65% RH. Then, the initial load and 98/50 mN × 20 × 9 × total tex (0.2 gf × 20 × A heavy load of (total denier) was applied, the heel length: L0 was measured, only the heavy load was immediately removed, and the heel length: L1 after 1 minute of dewetting was measured. Further, the soot was immersed in water at a temperature of 20 ° C. for 2 hours with the initial load applied, and then taken out. The filter paper (size 30 cm × 30 cm) was applied with a pressure of 0.69 mN / cm ² (70 mgf / cm ² ) for 5 seconds. After lightly wiping off the water, an initial load and a heavy load are applied, and the heel length: L0 ′ is measured. Only the heavy load is removed immediately, and the heel length: L1 ′ after 1 minute of dewetting is measured. From the above measurement values, the following formulas are used to calculate the crimp rate DC (%) at the time of drying, the crimp rate HC (%) at the time of wetness, and the crimp rate difference between the dry and wet conditions (DC-HC) ( %) Was calculated. In addition, the number of n was 5, and the average value was obtained.
Crimp rate during drying DC (%) = ((L0−L1) / L0) × 100
Crimp rate HC (%) when wet = (L0′−L1 ′) / L0 ′) × 100

(6) Crimp rate of crimped fibers in the fabric After the fabric is left in an atmosphere of a temperature of 20 ° C. and a humidity of 65% RH for 24 hours, a small piece of 30 cm × 30 cm in the same direction as the fabric is cut from the fabric ( n number = 5). Subsequently, the fiber is taken out from each piece, and the yarn length L0 is measured by applying a load of 1.76 mN / dtex (200 mg / de), and after 1 minute of dewetting, a load of 0.0176 mN / dtex (2 mg / de) To measure the yarn length L1. Further, the yarn was immersed in water at a temperature of 20 ° C. for 2 hours and then taken out, and then lightly wiped off with a filter paper (size 30 cm × 30 cm) at a pressure of 0.69 mN / cm ² (70 mgf / cm ² ) for 5 seconds. After that, the yarn length L0 ′ was measured by applying a load of 1.76 mN / dtex (200 mg / de), and after 1 minute of dewetting, the yarn length L1 ′ was applied by applying a load of 0.0176 mN / dtex (2 mg / de). Measure. From the above measurement values, the following formulas are used to calculate the crimp rate DC (%) at the time of drying, the crimp rate HC (%) at the time of wetness, and the crimp rate difference between the dry and wet conditions (DC-HC) ( %) Was calculated. In addition, the number of n was 5, and the average value was obtained.
Crimp rate during drying DC (%) = ((L0−L1) / L0) × 100
Crimp rate HC (%) when wet = (L0′−L1 ′) / L0 ′) × 100

(7) Breathability According to JIS L 1096-1998, 6.27.1, A (Fragile Breathability Tester Method), breathability when dried (cc / cm ² / s) and breathability when wet (cc / cm ² / s). However, when dry, the sample is left in a 20 ° C., 65% RH environment for 24 hours, while when wet, the sample is immediately immersed in water at 20 ° C. for 2 hours. , Sandwiched between a pair of filter papers (size: 50 cm × 50 cm), weighted for 1 minute at a pressure of 490 N / m ² (50 kgf / m ² ) to remove moisture present between the fibers, n number = 5) was measured, and the average was obtained. And the change rate of air permeability was computed by the following formula.
Percent change in air permeability (%) = ((air permeability when wet) − (air permeability when dry)) / (air permeability when dry) × 100

(8) Unevenness change of shoe material Unevenness change due to wetting was visually determined by the examiner in three stages: “no change”, “slightly change”, and “change”.

[Example 1]
Nylon 6 having an intrinsic viscosity [η] of 1.3 and modified polyethylene terephthalate copolymerized with 2.6 mol% of 5-sodium sulfoisophthalic acid having an intrinsic viscosity [η] of 0.39 are each 270 ° C. Melted at 290 ° C., extruded using a composite spinneret similar to that shown in FIG. 1 of JP 2000-144518 A, at a discharge rate of 12.7 g / min to form side-by-side type composite fibers, and cooled and solidified. After applying the oil agent, the yarn is preheated with a preheating roller at a speed of 1000 m / min and a temperature of 60 ° C., and then stretched between the preheating roller and a heating roller heated at a speed of 3050 m / min and a temperature of 150 ° C. It heat-processed and wound up and obtained 84 dtex / 24fil of composite fiber (crimped fiber A). The composite fiber had a breaking strength of 3.4 cN / dtex and a breaking elongation of 40%. Further, when the crimp rate was measured by performing boiling water treatment on the composite fiber, the crimp rate DC when dried was 3.3%, the crimp rate HC when wet was 1.6%, and the crimp rate when dried. The difference between the rate DC and the crimp rate HC when wet (DC-HC) was 1.7%.
Subsequently, using a 22 gauge 6 sheet double raschel machine, the distance between the hooks was adjusted to 3 mm, and a three-layered knitted fabric was knitted with the following thread use and structure.

The surface layer (the layer located on the outside air side when used) is composed of L1 and L2 yarns, the intermediate layer is composed of L3 and L4 yarns, and the back layer (located on the foot side when used) Layer) was composed of L5 and L6 yarns.
The obtained knitted fabric was pre-set at a dry heat of 180 ° C. and then dyed at a high pressure of 130 ° C., and a dry heat set at 170 ° C. was performed as a final set to obtain a shoe material.
In the obtained knitted fabric (shoe material), basis weight 251 g / ^{m 2,} thickness is 2.7 mm, breathable when dry 83cc / ^cm 2 / s, breathable wet in 89cc / ^cm 2 / s Yes, the rate of change in air permeability was 7.2%. Also, the unevenness slightly changed due to wetting. Further, the crimped fiber A contained in the knitted fabric has a reduced crimp rate when wet, and the crimp rate difference between dry and wet was 1% or more. The knitted fabric has a mesh structure in the surface layer composed of L1 and L2, and a back layer composed of L5 and L6, in which the intermediate layer composed of L3 and L4 has a border shape in which the constituent yarns are switched every 8 mm. It was a knitting made of
Next, when the athletic shoes were obtained and used using the knitted fabric (shoe material), the inside of the shoes was not stuffy and comfortable when sweating.

[Example 2]
Using the same conjugate fiber as in Example 1, a 22 gauge 5 sheet double raschel machine was used to knit a three-layer structure knitted fabric with the following yarn use and structure.

The surface layer (layer located on the outside air side when used) is composed of L1 and L2 yarns, the intermediate layer is composed of L3 yarns, and the back layer (layer located on the foot side when used) Consisted of L4 and L5 yarns.
The obtained knitted fabric was pre-set at a dry heat of 180 ° C. and then dyed at a high pressure of 130 ° C., and a dry heat set at 170 ° C. was performed as a final set to obtain a shoe material.
In the obtained knitted fabric (shoe material), the basis weight is 244 g / m ² , the thickness is 2.8 mm, the breathability when dried is 168 cc / cm ² / s, and the breathability when wet is 183 cc / cm ² / s. Yes, the rate of change in air permeability was 8.9%. Further, the unevenness was changed by wetting. Further, the crimped fiber A contained in the knitted fabric has a reduced crimp rate when wet, and the crimp rate difference between dry and wet was 1% or more. Further, the knitted fabric has a mesh structure in which the surface layer is a mesh structure and has a border shape in which the constituent yarns are switched every 10 mm width, and includes an intermediate layer composed of L3 and a back layer composed of L4 and L5. It was a knitted fabric.

[Comparative Example 1]
Using a 22 gauge 5 sheet double raschel machine, a three-layered knitted fabric was knitted with the following thread use and structure.

The surface layer (layer located on the outside air side when used) is composed of L1 and L2 yarns, the intermediate layer is composed of L3 yarns, and the back layer (layer located on the foot side when used) Consisted of L4 and L5 yarns.
The obtained knitted fabric was pre-set at a dry heat of 180 ° C. and then dyed at a high pressure of 130 ° C., and a dry heat set at 170 ° C. was performed as a final set to obtain a shoe material.
In the obtained knitted fabric, the basis weight was 225 g / m2, the thickness was 2.8 mm, the air permeability when dried was 410 cc / cm ² / s, and the air permeability when wet was 410 cc / cm ² / s. The rate of change was 0%. Also, the unevenness did not change due to wetting. Further, the knitted fabric was a knitted fabric having a surface layer composed of L1 and L2 having a mesh structure, an intermediate layer composed of L3, and a back layer composed of L4 and L5.
Next, when an athletic shoe was obtained and used using the knitted fabric (shoe material), the inside of the shoe was stuffy and uncomfortable when sweating.

  ADVANTAGE OF THE INVENTION According to this invention, the shoe material which improves air permeability at the time of wetness, and the shoes using this shoe material are obtained, The industrial value is very large.

Claims (7)

A fabric comprising a crimped fiber A that is used as a member of a shoe and has a reduced crimp rate when wet, and a fiber B that is a non-crimped fiber or a crimped fiber that does not change crimp rate when wet , And the change rate of the air permeability defined by the following formula in the fabric is 5% or more, the fabric has a three-layer structure woven / knitted structure, and at least one of the three-layer structure woven / knitted structure The outermost layer is a mesh structure, and the crimped fibers A and fibers B are arranged in stripes on the intermediate layer of the three-layer structure knitting and knitting structure, and irregularities appear on the surface of the shoe material when wet. A characteristic shoe material.
Percent change in air permeability (%) = ((air permeability when wet) − (air permeability when dry)) / (air permeability when dry) × 100   The shoe material according to claim 1, wherein the crimped fiber A is a composite fiber in which a polyester component and a polyamide component are bonded in a side-by-side manner. The shoe material according to claim 2 , wherein the polyester component is a modified polyester obtained by copolymerizing 2.0 to 4.5 mol% of 5-sodium sulfoisophthalic acid. The shoe material according to any one of claims 1 to 3 , wherein the crimped fibers A and fibers B are arranged in a stripe pattern on at least one of the outermost layers of the three-layer structure woven or knitted fabric. The shoe material according to any one of claims 1 to 4, wherein the fabric has a thickness of 1 to 5 mm. The fabric weight is 200 to 500 g / m ² The shoe material in any one of Claims 1-5 which is in the range of these. A shoe using the shoe material according to claim 1.