JPH08280402A - Shoes - Google Patents

Abstract

PURPOSE: To provide shoes which have a function to rapidly discharge the moisture and water in the shoes outside the shoes and has excellent comfortability in view of the problems associated with the conventional artificial leather shoes. CONSTITUTION: These shoes are composed of artificial leather 1 in at least a part of the shoe skin and are formed by arranging and integrating the artificial leather 1 in a position where a woven fabric-like material deviates to its one surface. The artificial leather has a moisture vapor transmission rate of at least 4000g/m<2> .24Hr when measured in accordance with the JIS L-1099. A woven fabric-like material laminated surface 2 on the side where the woven fabric-like material exists in deviation is arranged on the inner side of the shoes skin.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to highly comfortable shoes having a function of quickly discharging moisture and water inside shoes through the outer skin, and further, has excellent wear resistance and durability. Regarding shoes.

[0002]

2. Description of the Related Art Heretofore, various products and manufacturing methods have been proposed for artificial leather shoes, which mainly use synthetic fibers similar to natural leather and elastic polymer.

[0003]

No such conventional artificial leather has a function of discharging sweat. Especially, in the case of a large amount of sweat such as sports shoes, the foot gets stuffy or the skin is soaked. There were problems such as causing odor and being susceptible to athlete's foot. The present invention
In view of the problems of the conventional artificial leather shoes, it is an object of the present invention to provide shoes which have a function of quickly discharging moisture and water in the shoes to the outside of the shoes and which are excellent in comfort.

[0004]

The present invention employs the following means in order to solve such problems. That is,
The shoes of the present invention are shoes in which at least a part of a shoe skin is made of artificial leather, and the artificial leather is integrated by disposing a woven material on one side in a biased position. And has a water vapor transmission rate of at least 4000 g / m ² · 24 Hr when measured according to JIS L-1099, and a woven fabric laminated surface on which the woven fabric is unevenly present. It is characterized in that it is arranged inside the shoe skin.

[0005]

Function: Conventional shoes made of artificial leather are generally evaluated to be impractical because they have a very small sweat and moisture discharging function and have a severe foot stuffing phenomenon. The present inventors have diligently studied the drawbacks of such artificial leather shoes, and by changing the fiber structure constituting the artificial leather to one having a specific structure, a foot stuffy phenomenon that could not be solved in the past was summarized. Has been successfully resolved.

That is, an artificial leather in which a woven material is unevenly laminated on one surface is used as the shoe skin, and the unique function of the water diffusion phenomenon of the artificial leather is used. That is, by arranging the side of the artificial leather on which the woven material is unevenly laminated inside the shoe skin, the water droplets and water on the inside are rapidly transferred from the surface of the back skin to the atmosphere. It causes a unique function of diffusion and discharge. Therefore, according to the present invention, even if the sole of the foot sweats, it is possible to quickly discharge such water from the shoe skin and provide shoes having comfortable wearing comfort. It exerts excellent power when shoes are washed or wet. That is, since the water in the shoe is quickly discharged to the outside of the shoe, an excellent quick-drying property is exhibited.

[0007] Such a function is not exerted only by the one in which the woven material is unevenly arranged on one side of the artificial leather, but first, the nonwoven fabric and the woven material are entangled and integrated. It is important that the specific artificial leather has a water vapor transmission rate of at least 4000 g / m ² · 24 Hr when measured according to JIS L-1099. Here, the higher the moisture permeability is, the more preferable it is from the viewpoint of foot stuffiness and quick drying property. In the present invention, it is preferably 5000 g / m ^2.
・ 24 hours or more, more preferably 6000 g / m ²・ 2
It is preferably 4 hours or more, particularly 6500 to 9000 g / m ² · 24 hours. This moisture permeability depends on the thickness and density of the artificial leather, especially the fiber density of the non-woven fabric, and in the case of ordinary shoes, a maximum moisture permeability of about 12000 g / m ² · 24 Hr is acceptable, but depending on the type of shoes and the required characteristics. It is preferable to determine the one with the optimum moisture permeability.

Next, in the shoes of the present invention, the position where the woven material is arranged is important. That is, the position of the woven fabric greatly affects the unique function of the water diffusion phenomenon (water diffusion characteristic) of the artificial leather. For example, when the woven material is placed in the center of the leather, the function is 1.5 times to at most 3 times or less. However, the arrangement of the woven material exceeds the position where the thickness of the artificial leather is biased, preferably more than 2/3, more preferably 3/4.
Above, and particularly preferably when biased 4/5 or more,
Surprisingly, it exhibits a water diffusion property of preferably at least 5 times, more preferably 10 times or more, particularly preferably 15 times or more.

Here, the water diffusion characteristic means the permeation and diffusion state (diffusion area) of the water on the same surface or the back surface when water is dropped on one surface of the artificial leather, and the diffusion radius on the corresponding surface. It is measured and expressed as the ratio of the square of the radius. Since such water diffusion draws a substantially circular shape, there is no problem with the above calculation method, but especially when it diffuses into a different shape,
It may be measured by a projection drawing method on a homogeneous paper, or may be measured by various area measuring machines. Further, for easy observation and confirmation, it can be easily confirmed by dropping colored water.

That is, the characteristic feature of the artificial leather of the present invention is that the closer the woven material is to the position closer to the surface, the higher the water absorption rate and the greater the diffusion rate. Of.

FIG. 1 shows an example of measuring the water diffusion characteristics of the artificial leather of Example 1. This figure is an example of measurement of the artificial leather 1 dyed in beige, and an example in which water colored red is dropped on the raised surface (surface) of the artificial leather placed on a test stand.
FIG. 3 is a schematic view showing that a trace of water diffusion shown by a dotted line portion 3 is observed on the woven fabric laminated surface 2 on the back surface.

In the actual measurement in the case of this figure, the diameter of the dropping point 4 was 9 mm and the dotted line portion was 44 mm, so (44/2) ²
/ (9/2) ² = about 24 times the water diffusion characteristics. The water diffusion property depends largely on the arrangement position of the woven material as described above, but the fiber density of the non-woven fabric is further related to the speed of absorption and diffusion. That is, the higher the fiber density is, the lower the absorption rate and the diffusion rate are. However, if the fiber density of the non-woven fabric layer is lowered, the strength, feel and appearance of the artificial leather are impaired.
00-600 g / m ² , more preferably 150-50
It is preferable to use the one having a basis weight in the range of 0 g / m ² . By using a fabric having such a basis weight, it is possible to improve both the moisture permeability, the flexibility and the water absorption rate.

If the fiber density becomes too high, the water vapor permeability will not be satisfied. Therefore, it is preferable to adjust the fiber fineness and the fiber density (area weight) from the relationship between the water vapor transmission rate. That is, the fibers constituting the non-woven fabric are preferably composed of ultrafine fibers having a single yarn fineness of 1 denier or less, more preferably ultrafine fibers having a denier of 0.1 denier or less. Good for increasing absorption rate.

The strength of the artificial leather of the present invention depends more on the woven material than on the non-woven fabric itself. That is, the strength of the artificial leather of the present invention is mainly represented by the strength of the woven material. Therefore, it is preferable that the yarns constituting the woven material are composed of high-strength fibers. Examples of the material include synthetic fibers such as polyester, polyamide and aramid, natural fibers such as cotton, wool and silk, rayon and the like. Any fiber that can be woven or woven such as recycled fiber or semi-synthetic fiber such as acetate can be used. For example, aromatic polyamide, polyphenyl sulfone or high strength polyester, polyvinyl alcohol, polyolefin, etc. Fibers that have been subjected to a spinning method, processing, or treatment for the purpose of use, and preferably have a strength of at least 10 g / d, and more preferably 15 g / d or more. Furthermore, in the case of a yarn composed of the same fiber material as the fibers constituting the nonwoven fabric, a yarn having a total fineness of preferably at least 10 denier, more preferably 20 denier or more, and particularly preferably 30 to 300 denier is used. used. A finer thread is better in terms of uniformity, but if it is too thin, it will be caught tightly with the barb and will be easily damaged. On the other hand, if the needle is too thick, it will not escape when the tip of the needle hits the thread, and the fiber is likely to break, which is not preferable. The most preferable range as the balance between the effect of integrating the fibers as a strongly twisted yarn and the thickness is:
It is 50 to 150 denier. In the present invention, the use of the strongly twisted yarn makes it difficult for the fiber to be caught in the barb, and even if the fiber is caught, the fiber is easily detached.

In any case, as the yarn of the present invention, a yarn having a twist of at least 700 T / m, more preferably 1000 T / m or more, particularly preferably a strongly twisted yarn of 1500 to 4000 T / m is diffused. It is preferably used from the standpoint of improving speed and avoiding problems such as yarn breakage during punching. The type of strongly twisted yarn used is not particularly limited, such as filament yarn, spun yarn, innovative spun yarn, and filament yarn / spun yarn. As such a woven material, a mesh (mesh-like material), an entangled weave, and the like are preferably used, but the woven material is not limited to these and, for example, has a basis weight of 20 to 200 g / m ² , and most preferably. 30-150g
A woven material in the range of / m ² can be used.
If the basis weight is too small, the form of the woven fabric becomes extremely loose, and wrinkles occur when sandwiched in the middle layer portion or when laid on the surface, which makes it difficult to spread uniformly. Further, if the basis weight is too large, the woven structure becomes dense, the penetration of the nonwoven web is insufficient, the entanglement of the nonwoven web does not proceed to a high degree, and it becomes difficult to form a structure that is separated and integrated. Among these woven fabrics, preferred are those in which the strong twisted yarn is used at least in the warp and the weft, and particularly preferable are those in which the strong twisted yarn is used. When the warp yarn is used on one side of the warp, the fiber damage is greatly suppressed by planting and punching the needle so that the barb of the needle faces the strongly twisted yarn.
Furthermore, if a different driving condition such as alternating charging or S (or Z) single twisted yarn driving is used, the latent torque unwinding process is performed after needle punching to utilize the torque restoring force of the strongly twisted yarn to give a natural texture. Tone or Yangyanagi tone appearance can be obtained, and the fabric reinforcing effect may be achieved by needle-punching a woven fabric on which torque has been developed in advance.

The weight ratio of the fabric to the nonwoven web is 7
It is preferably 0% or less, and most preferably 10 to 5
It is 0%. When the weight ratio of the knitted fabric to the nonwoven web exceeds 70%, the knitted fabric is likely to be exposed on the surface of the nonwoven fabric.

In the artificial leather of the present invention, when such a woven material is integrated with a nonwoven fabric, it exhibits an excellent water diffusion function. That is, the water diffusion function is a function of spreading in a wide area in a woven material, dispersing in the nonwoven fabric, and releasing it from the raised portion into the outside air. The present invention is characterized in that such a role is shared by the woven material and the non-woven fabric layer. That is, by arranging the laminated surface of the woven material inside shoes, sweat and water attached to the inside of the shoes are
The woven material is rapidly diffused in an area of four sides, for example, about 5 times or more, and then the diffused sweat and water are further dispersed and released to the non-woven fabric layer surrounding the woven material. is there.

This phenomenon can be easily understood by analyzing the fiber density of the artificial leather. That is, in the artificial leather, the woven material portion has the highest fiber density, then the fiber density filled in the weave, then the non-woven fabric layer on the epidermis side, and then the coarsest fiber of the raised portion. Is the density. Therefore, the artificial leather of the present invention exhibits the most water-diffusion function on the inside of the shoe, that is, on the side where the woven material is laminated. That is, when sweat water is generated at one point in the shoe, the woven material exhibits the function of quickly absorbing the sweat water and diffusing it into the surrounding leather all at once. It is carried to the raised part through the non-woven fabric layer entangled with the object and released. Since this raised part is in contact with the atmosphere, it constantly wicks water,
It has the function of releasing. Therefore, the water absorbed on the laminated side of the woven material is always sucked to the raised side.

As an example of one specific means for producing the artificial leather of the present invention, first, an ultrafine synthetic fiber having a denier of 1 or less or an ultrafine synthetic fiber web is formed. This web, a strongly twisted yarn woven material (hereinafter referred to as a woven fabric), and this web are overlaid and needle punched to sufficiently enhance the entanglement of the web itself and the entanglement of the web and the woven fabric to form a non-separable integral structure. After that, after a latent torque removing step of the woven fabric, if necessary, a combined treatment of a binder applying step and an ultrafine fiberizing step is performed.

The non-separable integral structure referred to here is, for example, that ultrafine fibers are not only entangled at random in the structure of the woven fabric but also entwined with each other while maintaining their morphology, and exfoliated by a considerable stress. Even if the woven fabric and the non-woven web are not peeled off, the structure has a strong entanglement such that the tissue is destroyed rather than peeled when the stress is further increased. This structure has a great effect on the improvement of the custom wear and the strength / elongation property which will be described later. Here, the strong twisted yarn constituting the above-mentioned woven fabric has a strong force for maintaining the rod-shaped structure with strong integrity, the constituent single fibers hardly catch on the barb of the needle, and the tissue is substantially destroyed. Demonstrate the characteristic that there is no. The polymer of the ultrafine synthetic fibers forming the above-mentioned nonwoven web is not particularly limited, but polyethylene terephthalate (hereinafter, referred to as P
ET), polybutylene terephthalate (hereinafter P
It is possible to use a polymer having a fiber-forming ability such as BT), polyester elastomer such as polyester elastomer, nylon 6, nylon 66, polyamide elastomer such as polyamide elastomer, polyurethane, polyolefin, acrylonitrile. Among them, PET and PB
T, Nylon 6, Nylon 66 and the like are particularly desirable from the viewpoint of the texture of the processed product and the practical performance. Further, as the ultrafine fibers obtained by removing a part of the polymers constituting the conjugate fiber or peeling them from each other like the sea-island type fiber, as the component to be removed, for example, polystyrene and its copolymer, PVA, One or two kinds of copolyester, copolyamide and the like can be used. In particular, polyester-based polymers are preferably used because they can be easily made into ultrafine particles.

The raw fiber of the ultrafine fiber to be subjected to the above needle punching, whether it is the composite fiber before ultrafine or after being ultrafine, has a raw fiber length of at least 20.
It is preferable to use one having a size of not less than mm in order to effectively entangle and achieve integration. However, the final product contains fibers of less than 20 mm due to subsequent processing such as slicing and buffing, but this is not a problem for the present invention.

The polymer binder used in the present invention includes polyurethane, SBR, NBR, polyamino acid,
A polymer having rubber-like elasticity such as an acrylic adhesive can be used, but polyurethane is particularly preferably used. As the binding method, various methods such as a method of coating or impregnating a polymer elastic body solution and then solidifying it, or a method of coating or impregnating them with an emulsion or latex thereof and drying and fixing them can be used.

For intertwining the non-woven web and the woven fabric, a strong twist yarn woven fabric is laminated between a short-fiber non-woven web or a long-fiber non-woven web formed into a sheet using a card, a cross wrapper, a random web or the like, and needles are used. It is best to entangle the fibers with each other by punching, but only one side may be used. In selecting the needle used in the needle punch, there is a point that cannot be generally stated in relation to the knitted fabric, but as a guideline, the throat depth of the barb is 30 to 150 μ, preferably 50 to 100 μ. . In particular, if it is desired to avoid damage to the knitted fabric by needle punching, the barb of the needle should be inclined at an angle of 45 °, for example, so that it does not hit the knitted fabric at a right angle.
A remarkable effect can be obtained by directing to. In such a case, it is administratively advantageous to use a needle having a barb oriented in one direction. The most preferred example of this is a needle with only one barb.

There are various methods for removing sea components, such as a solvent extraction method and a thermal decomposition method, in the case of removing sea components with ultra-fine type fibers. Generally, the solvent extraction method is simple. Is. This operation is performed before or after applying the elastic polymer. Buffing is generally performed using sandpaper. In particular, in the present invention, it is preferable to buff the surface after applying the binder because good naps can be formed. In such a case, the abrasion resistance is extremely strong due to the strong entanglement of the ultrafine fibers and the knitted fabric by needle punching, and it is not easy to remove the naps.

[0025]

EXAMPLES Next, the present invention will be described in more detail with reference to Examples and Comparative Examples. The physical properties were measured by the following methods. Flexibility: JIS-L1079 5.17 A method Tensile strength and elongation: JIS-L1079 5.12.1 Custom wear: Measurement conditions Air pressure: 0.281 kg / cm ² Pressing load: 0.454 kg Friction speed ( Reciprocation / min): 125 ± 5 times Rotation of test piece: 1/100 reciprocation (48 seconds) Reciprocation distance: 2.54 cm Paper: # 400-RIKEN Example 1 Polyethylene terephthalate as island component and polystyrene as sea component 80/20 composition ratio, 16 islands,
Composite fiber denier 3d, fiber length 51mm, crimp number 14
Cards made from raw cotton of mountain / inch sea-island type composite fiber,
A web was prepared through the process of cross-wrapping, and then needle prepunching was carried out at 100 pieces / cm ² to prepare a felt having a basis weight of 380 g / m ² . A plain woven fabric (weight per unit area of 90 g / m ² ) made of raw twisted yarn with a twist of 75 d-36 f and a twist number of 2000 T / m was uniformly spread on both sides and sandwiched.

Next, using a needle board in which this three-layer sheet was randomly implanted in the direction of a needle depth of 7 mm barb,
Needle punching of 2500 needles / cm ² was performed to obtain a nonwoven fabric having a basis weight of 650 g / m ² . The strong twist fabric used is
There was no damage or sticking due to the barb, and the non-woven web and the strongly twisted fabric had a separated and integral structure. This non-woven fabric was subjected to latent torque unwinding treatment with hot water at 98 ° C., a PVA solution was applied to the island component in a solid content of 35% and dried, and then polyurethane was coagulated in water. This sheet was further dipped in hot water and repeatedly squeezed to remove PVA and DMF, and after drying, the non-woven fabric was half-cut (sliced) into two sheets. The sliced surfaces of these sheets are buffed to form naps, and then the disperse dye is used at 120 ° C.
× 60 minutes jet dyeing, thickness 1.0mm, basis weight 342g
/ M ² and a density of 0.342 g / cm ³ of suede-like artificial leather were obtained.

The artificial leather obtained was soft and rich in fullness. Moreover, as shown in Table 1, in addition to being excellent in water diffusion characteristics and moisture permeability, it was also excellent in tenacity characteristics and wear characteristics, and was further reduced in elongation.

A shoe is made of this artificial leather, and 100 is put in the shoe.
Water of cc was added and left in a temperature control room (20 ° C., 65% RH). The shoes were dry in 6 hours, ready to be worn, and comfortable to wear.

Comparative Example 1 In Example 1, the strongly twisted fabric was not laminated between the pre-punched up felts, and the subsequent processes were all performed in the same manner as in Example 1. As shown in Table 1, the obtained leather was inferior in strength properties and wear properties, did not achieve low elongation, and was significantly inferior in water diffusion property and moisture permeability.

A shoe is made of this artificial leather, and 100 is put in the shoe.
Water of cc was added and left in a temperature control room (20 ° C., 65% RH). This shoe did not dry after 12 hours, and the inside of the shoe was jerky.

Comparative Example 2 The needle punched nonwoven web of Example 1 was
Two sheets of 0 g / m ² and 95 g / m ² were formed, a woven fabric was inserted in the middle, needle punching was performed, and the subsequent processing was performed in the same manner as in Example 1. The obtained leather differed markedly in water diffusion properties.

A shoe is made of this artificial leather, and 100 is put in the shoe.
Water of cc was added and left in a temperature control room (20 ° C., 65% RH). Even after 12 hours, the shoes were slightly moist and uncomfortable to wear.

[0033]

[Table 1]

[0034]

EFFECTS OF THE INVENTION According to the present invention, it is possible to provide shoes which are excellent in comfort and have a function of promptly discharging moisture and water in the shoes to the outside of the shoes, and further, the abrasion resistance and the wear resistance of the shoes. Not only durability but also flexibility, it is particularly suitable for sports and work shoes and boots.

[Brief description of drawings]

FIG. 1 is a schematic view showing a method for measuring water diffusion characteristics of artificial leather of the present invention.

[Explanation of symbols]

 1: Artificial leather 2: Woven fabric laminated side surface 3: Water diffusion trace on back surface (dotted line part) 4: Dropping point

Claims (22)

[Claims] 1. In shoes in which at least a part of a shoe skin is made of artificial leather, a woven material is arranged and integrated so as to be biased to one side of the artificial leather,
At least 400 when measured based on JIS L-1099
A shoe having a water vapor transmission rate of 0 g / m ² · 24 Hr and having a woven fabric laminated surface, which is a side where the woven fabric is unevenly present, disposed inside the shoe skin. Kind. 2. The shoe according to claim 1, wherein the woven material is arranged at a biased position exceeding 2/3 of the thickness of the artificial leather. 3. The shoe according to claim 1, wherein the woven material is arranged at a position deviated to 4/5 or more of the thickness of the artificial leather. 4. The following water diffusion property from the laminated surface of the woven fabric-like material to the back surface of the artificial leather-like material is at least 5 times.
The shoes mentioned. Here, the water diffusion characteristics, when water is dropped on the woven fabric laminated surface of artificial leather, the permeation diffusion state (area) to the back surface of the water, the diffusion radius on each surface is measured, It is expressed by the ratio of the square of the radius. 5. The shoe according to claim 1, wherein the water diffusion property is at least 10 times. 6. The shoe according to claim 1, wherein the woven material is a mesh material. 7. The shoe according to claim 1, wherein the mesh-like material is selected from a entangled woven fabric or a net structure. 8. The shoe according to claim 1, wherein the woven material is made of hard-twisted yarn. 9. The shoe according to claim 8, wherein the strongly twisted yarn has a twist number of at least 700 T / m. 10. The shoe according to any one of claims 1 to 9, wherein the woven material is composed of a yarn made of a fiber having a single yarn fineness larger than that of a fiber constituting a non-woven fabric. 11. The shoe according to claim 8, wherein the yarn constituting the woven material is a fiber having a single yarn fineness of at least 0.5 denier. 12. The shoe according to claim 8, wherein the yarn constituting the woven material has a total fineness of at least 10 denier. 13. The shoe according to claim 1, wherein the woven material has a basis weight of 200 g / m ² or less. 14. The shoe according to claim 1, wherein the non-woven fabric is composed of ultrafine fibers having a single yarn fineness of 1 denier or less. 15. The shoe according to claim 14, wherein the non-woven fabric contains ultrafine fibers having a single yarn fineness of 0.1 denier or less. 16. The shoe according to claim 1, wherein the nonwoven fabric is punched. 17. The shoe according to claim 1, wherein the nonwoven fabric on the surface side of the artificial leather is napped. 18. The shoe according to claim 1, wherein the non-woven fabric is mainly composed of polyester fibers. 19. The shoe according to claim 1, wherein the non-woven fabric is entangled and integrated with the woven material by the fibers constituting the non-woven fabric. 20. The shoe according to claim 1, wherein the artificial leather contains polyurethane as a polymer binder. 21. The shoe according to claim 1, wherein the artificial leather has a basis weight of 600 g / m ² or less. 22. The shoe according to claim 1, wherein the artificial leather is water repellent.