JP6777675B2 - How to make breathable waterproof shoes - Google Patents

Description

The present invention relates to a method of manufacturing a breathable waterproof shoe . More specifically, the present invention relates to a method for producing a breathable waterproof shoe in which water vapor generated in the shoe is dissipated to the outside of the shoe to prevent water droplets of a source such as rain from penetrating into the shoe.

The present invention is intended for so-called shoes in a broad sense, that is, footwear that wraps the foot, protects the foot, and assists or improves various exercises such as walking and running, and its design, place of use, use, gender, and age. Not restricted to anything else. Regarding the material, the sole [outer sole (outsole), insole (midsole)] is natural or synthetic rubber (including EVA), urethane sponge, etc., and the upper is natural leather or artificial leather, or The target is knitted fabrics manufactured from various fibers or their composite materials. Therefore, in the present invention, the term "shoes" is generically referred to without being limited to the shape, use, design, material, and the like.

The main component of the shoe is the upper. The upper is a part that wraps the entire instep and is not manufactured from a single material, but through the "upper surface material" as the exterior material of the shoe, and directly or through various clothing items such as socks. It is composed of at least two pieces of material consisting of "upper lining" that makes contact with the instep inside the shoe. The upper is formed into a single upper as a whole by punching and sewing the upper surface material and the raw fabric to be the upper back material together according to a cutting pattern with a punching die.

The material used as the upper surface material or upper backing material is shoes to be manufactured from various natural leathers, artificial leathers, various textile products such as woven fabrics, knitted fabrics, non-woven fabrics, natural or synthetic rubber, or molded products of various synthetic resins. It is appropriately selected according to the intended use, required performance, and the like. In particular, in recent years, so-called double raschel or nylon mesh, which is made by knitting synthetic fibers such as polyester fibers into a three-dimensional structure by warp knitting (vertical knitting), is used especially for both the upper surface material and the upper back material of sports shoes and the like. Has been done. It is desirable that the upper surface material or the upper backing material described above is waterproof or water repellent.

Conventionally, shoes have been mainly developed to add various functions such as shock absorbing properties, stability, anti-slip properties, and mass reduction. One of the important development issues is the improvement of the shoe environment. Improving the environment inside shoes mainly releases water vapor generated inside the shoes to the outside of the shoes to prevent or reduce so-called "stuffiness" and prevent water droplets from which rain or other sources have penetrated into the shoes. Shoes, i.e. breathable waterproof shoes, have been proposed.

The mainstream of conventional breathable waterproof shoes is to transfer water vapor generated in the shoe between the upper surface material and the upper consisting of at least two layers of the upper lining material that directly or indirectly contacts the foot through socks or the like. It is a type in which a "moisture permeable / waterproof film" is inserted to prevent water vapor from rain and other sources from penetrating into the shoes. The term "ventilation waterproof" is synonymous with "breathable / waterproof".

There is no definitive definition of the thickness of the term "film", neither academically nor in industry standards, and there is no clear difference between "film" and "sheet". In any case, in the art, a film body thinner than 100 to 200 μm is referred to as a “film” and a film body thicker than that is referred to as a “sheet”, and the present invention also follows the conventional practice. And.

Japanese Patent No. 5661046 Japanese Patent No. 5883788 Japanese Patent No. 5501441

In all of Patent Documents 1 to 3 exemplified, a breathable waterproof film made of foamed polytetrafluoroethylene, polyurethane, polyethylene, polypropylene, polyester or the like is applied to the upper surface material and directly or indirectly to the foot via socks or the like. It is a type in which it is inserted between an upper structure composed of at least two layers of an upper backing material that comes into contact with the upper material, and is joined to both the upper surface material and the upper back surface. By the way, the tensile strength [kg / cm (ASTMD882 to 61T)] of the polytetrafluoroethylene film usually used as a breathable waterproof film is 1.1 to 2.8, and the elongation at break [% (ASTMD882 to 61T)). ] Is 100 to 350, the tensile strength [kg / cm (ASTMD882 to 61T)] of the polypropylene film is 3.5 to 6.3, and the elongation at break [% (ASTMD882 to 61T)] is 450 to 650. The tensile strength [kg / cm (ASTMD882 to 61T)] of the polyethylene film is 1.1 to 4.3, the elongation at break [% (ASTMD882 to 61T)] is 10 to 650, and the tensile strength of the polypropylene film [kg]. / cm (ASTMD882 to 61T)] is 3.2 to 23.2, breaking elongation [% (ASTMD882 to 61T)] is 50 to 1,000, and the tensile strength of the polyester film [kg / cm (ASTMD882 to 61T)] )] Is 14 to 24.6; 28.1 (T type), and the elongation at break [% (ASTMD882 to 61T)] is 60 to 165; 50 (T type).

However, the breathable waterproof film has a very thin thickness of 15 μm to 70 μm. Therefore, when these films themselves are used alone, they do not easily crack, but when they are fixed to the upper surface material and upper back material, the breathable waterproof film is completely resistant to their movement or shape change. Is unable to follow and may deform or break. In particular, in the case of sports shoes used for intense exercise such as basketball, soccer, rugby, or long-term exercise such as jogging and marathon, the force applied to the upper surface material and / or the upper back material is in the vertical and horizontal directions. In addition to the simple two directions, an unexpected load due to a momentary stop or change of direction may be applied to the upper surface material and / or the upper back material. In such a case, since the elongation or elasticity of the breathable waterproof film is different from that of the upper surface material and / or the upper backing material, among the three of the upper surface material, the upper backing material and the breathable waterproof film. The thinnest breathable waterproof film may crack or break.

Therefore, the problem to be solved by the present invention is that the shoe is between the upper surface material and the upper composed of at least two layers of the upper backing material that directly or indirectly contacts the foot through socks or the like. To improve the shortcomings of conventional breathable waterproof shoes of the type that dissipate the water vapor generated inside the shoe to the outside of the shoe and insert a breathable waterproof film that prevents water droplets from the source of rain or the like from penetrating into the shoe. Is.

A more specific problem to be solved by the present invention is between the upper surface material and the upper structure consisting of at least two layers of the upper backing material that directly or indirectly contacts the instep through socks or the like. A new breathable waterproof material that is inserted into the shoe to dissipate the water vapor generated inside the shoe to the outside of the shoe and prevent water droplets from the source of rain and other sources from penetrating into the shoe. Used for intense exercise such as basketball, soccer, rugby, or long-term exercise such as jogging or marathon, even if it is joined to both the upper lining that comes into direct contact with the instep, either directly or through socks. However, by following the deformation of the upper surface material and upper backing material, even if an unexpected load is applied to the shoe due to a momentary stop or change of direction in addition to the simple two directions of the vertical direction and the horizontal direction. To provide a breathable waterproof material for breathable waterproof shoes that does not crack or break.

Another more specific problem to be solved by the present invention is an upper structure composed of at least two layers of an upper surface material and an upper backing material that directly or indirectly contacts the instep through socks or the like. A new breathable waterproof material that is inserted between the shoes to dissipate the water vapor generated inside the shoe to the outside of the shoe and prevent rain and other water droplets from penetrating into the shoe, at least on the back of the upper. It is to provide a breathable waterproof material that is as thick and elastic as the material.

More specific problems to be solved by the present invention will be clarified sequentially below.

The present inventor has inserted a thin breathable waterproof film of 100 to 200 μm or less between the upper backing material and the upper surface material, and adhered to both the upper backing material and the upper surface material. The thickness of the breathable waterproof film is too thin compared to the upper backing material and the upper surface material, so it cannot follow the deformation of the upper backing material or the upper surface material due to the vigorous exercise of the shoe wearer, and the use of shoes It was confirmed that stress was concentrated on a specific part of the film depending on the mode, causing tearing or breaking of the film.

Therefore, as a means for solving the problem, a breathable waterproof material is inserted between the upper backing material and the upper surface material of a shoe having an upper composed of at least two layers of the upper backing material and the upper surface material. , A breathable waterproof shoe that adheres to both the upper backing material and the upper surface material to dissipate the water vapor generated in the shoe to the outside of the shoe and prevent water droplets from which rain or the like is the source from penetrating into the shoe. The breathable waterproof material has the same thickness and elasticity as the thickness of the upper backing material and the upper surface material, and the diameter of water vapor generated when shoes are worn on the entire surface in the width direction. Use a ventilated waterproofing material with a large number of micropores that are larger and smaller than the diameter of the water droplets from which rain or the like is the source.

The breathable waterproof material used in the present invention is manufactured in the form of a "fabric" using various elastic fibers as raw threads. The term "fabric" used in the present invention means "sheet-like textile product" defined by JIS fiber terminology (JIS L 0206 1284), and in a broad sense, woven fabric, knitting (knit), Russell lace, Russell. Includes nets, braids, torsion laces, riverleys, wool felts, needle punched non-woven fabrics, water flow punched non-woven fabrics, chemical non-woven fabrics, spunbonds and the like. As the structure of the woven fabric used in the present invention, a plain weave woven fabric having elasticity (stretch) is preferable, and a rubber knitting, which is a kind of weft knitting, is preferable because it is rich in elasticity.

The elastic fibers for producing the breathable waterproof material used in the present invention include polyurethane-based elastic fibers, copolymer fibers of acrylonitrile and butadiene, polycarbonate derived from bisphenol A and block copolymer derived from polyester glycol carbonate, high softening point polyester and low softening point. Block copolymer fibers from polyester, core-sheath composite fibers made by composite spinning of polyurethane and polyamide, polyether ester-based elastic fibers, conjugated yarns of polyester and polybutylene terephthalate, polymethylene terephthalate and the like are preferable.

The breathable waterproof material used in the present invention can be produced not only by using the elastic fiber described above as the raw yarn but also by using the non-elastic fiber as the raw yarn. That is, after twisting a filament yarn such as polyester fiber, polyamide fiber, or nylon, which is originally inelastic, it is heated and fixed, and the twist is returned to form a crimp to impart elasticity or bulkiness. Further, it can be made into an elastic cloth and used as a breathable waterproof material.

In the breathable waterproof shoe of the present invention, the thickness of the front and back materials constituting the upper and the thickness of the breathable waterproof material are important. In the present invention, the thickness of the upper surface material is preferably in the range of about 0.2 to about 5.0 mm. The thickness of the upper backing material is preferably in the range of about 0.2 to about 5.0 mm. The thickness of the breathable waterproof material is preferably in the range of about 0.2 to 3.0 mm. If the thickness of the ventilation waterproof material is in the range of about 0.2 to 3.0 mm, the ventilation waterproof shoes manufactured by inserting between the upper surface material and the back material have a thickness of 15 μm to 70 μm, which is the upper. Sufficient for deformation of the upper lining or upper surface due to strenuous exercise by the shoe wearer, such as conventional breathable waterproof shoes that use a breathable waterproof film that is very thin compared to the thickness of the front and lining. It cannot follow and does not crack or rupture.

Examples of the upper surface material and back material particularly preferable in the present invention include a waterproof nylon mesh, for example, a thin nylon mesh having a thickness of 0.2 mm or a thick double Russell having a thickness of 5.0 mm. Further, as a particularly preferable breathable waterproof material in the present invention, a waterproof nylon mesh having a thickness of 0.2 mm to 3.0 mm is exemplified. The configuration, manufacturing method, etc. of the breathable waterproof material particularly preferable in the present invention will be described later.

By the way, it is said that the diameter of water vapor generated inside shoes while wearing shoes and causes so-called stuffiness is about 0.0004 μm. The diameter of the water droplet is said to be about 100 to 600 μm. Therefore, in order to impart a breathable waterproof function to various fabrics manufactured using the above-mentioned elastic fibers as raw yarns, fine pores that allow water vapor to pass through and water droplets to pass through the entire surface of the fabric in the thickness direction, for example, It is preferable to perforate a large number of micropores of about 0.0004 μm to about 600 μm.

Further, in producing the breathable waterproof material used in the present invention, it is preferable to apply a water repellent treatment at the stage of the raw yarn or at the stage of knitting the fabric. Various types of water repellent treatment include "primary water repellent treatment" that adheres wax, oil, aluminum compounds, etc., and "durable water repellent treatment" that chemically bonds silicon resin, superhydrophobic compounds, so-called scotchgard, and raw yarn. Since the technology has been established, it is preferable to select the shoes in consideration of various conditions such as the application and characteristics of the breathable waterproof shoes to be manufactured.

Therefore, the present invention is solved by the means described in each of the following sections.
1. 1. Polyurethane-based elastic fiber, copolymer fiber of acrylonitrile and butadiene, block copolymer derived from polycarbonate and polyester glycol carbonate derived from bisphenol A, block copolymer fiber from high softening point polyester and low softening point polyester, core sheath by composite spinning of polyurethane and polyamide A group consisting of a type composite fiber, a polyether ester-based elastic fiber, an elastic fiber selected from the group consisting of a conjugated yarn of polyester and polybutylene terephthalate and a polymethylene terephthalate, or a group consisting of a polyester fiber, a polyamide fiber, and a filament yarn of nylon. After twisting the inelastic fiber selected from the above, heat and fix it, and untwist it to form a crimp to give elasticity, elasticity, or bulkiness to the fabric using inelastic fiber as the raw yarn. Aeration having a thickness of 0.2 to 3.0 mm, in which a large number of micropores having a diameter of 0.0004 μm to 600 μm are perforated over the entire surface of the cloth in the thickness direction to allow water vapor to pass through and water droplets to pass through. Producing a waterproof material; and inserting the breathable waterproof material between a predetermined upper surface material and the upper backing material, and fixing the breathable waterproof material to both the upper surface material and the upper backing material. How to make breathable waterproof shoes, including.

2. In the above item 1, the thickness of the upper surface material is in the range of 0.2 to 5.0 mm, and the thickness of the upper back material is in the range of 0.2 to 5.0 mm.

3. 3. In the above item 1 or 2, the raw yarn is subjected to a water-repellent treatment at the stage of the raw yarn, or is subjected to a water-repellent treatment at the stage of knitting on the fabric.

The breathable waterproof shoe of the present invention mainly has the effects illustrated below.
1. 1. As a breathable waterproof material, various elastic fibers or non-elastic fibers are formed into a woven fabric using elastic fibers imparted by a predetermined method as raw yarn, and water vapor is allowed to pass through the entire surface of the fabric in the thickness direction, and water droplets are not allowed to pass through. Since many micropores are perforated, various mechanical strengths such as tensile strength and elongation are higher than those of conventional moisture-permeable and waterproof films made of foamed polytetrafluoroethylene, polyurethane, polyethylene, polypropylene, polyester, etc. It is excellent and measures with the same conditions and the same measuring method to improve the moisture permeation effect by a maximum difference of about 20%.

2. Since the thickness of the breathable waterproof material used in the present invention is in the range of 0.2 to 3.0 mm, it is tougher and more durable than the conventional moisture-permeable / waterproof film having a thickness of 15 μm to 70 μm, which is extremely thin. There is. Therefore, when it is fixed to the upper surface material and the upper back material, it completely follows their movements or shape changes, and in particular, in addition to the simple two directions of the vertical direction and the horizontal direction, a momentary stop or a change of direction, etc. Even sports shoes used for intense exercise such as basketball, soccer, rugby, etc., or long-term exercise such as jogging, marathon, etc. are extremely thin with a thickness of 15 μm to 70 μm, and are conventional breathable and waterproof. It does not crack or break like a film.

The conceptual diagram explaining the ventilation waterproofing action of the ventilation waterproofing material used in this invention. FIG. 5 is a cross-sectional view showing a main part of a breathable waterproof shoe according to an embodiment of the present invention. A perspective view of the left foot showing the position where the temperature / humidity sensor is placed to measure the relative humidity in the shoe. (Note that the right foot is in a mirror image relationship in Fig. 3). The graph which compared the ventilation effect (humidity change in a shoe) of the ventilation waterproof shoe of this invention by a monitor (1), and the conventional ventilation waterproof shoe using a moisture-permeable / waterproof film. The graph which compared the ventilation effect (humidity change in a shoe) of the ventilation waterproof shoe of this invention by a monitor (2), and the conventional ventilation waterproof shoe using a moisture-permeable / waterproof film. The graph which compared the ventilation effect (humidity change in a shoe) of the ventilation waterproof shoe of this invention by a monitor (3), and the conventional ventilation waterproof shoe using a moisture-permeable / waterproof film. The graph which compared the ventilation effect (humidity change in a shoe) of the ventilation waterproof shoe of this invention by a monitor (4), and the conventional ventilation waterproof shoe using a moisture-permeable / waterproof film. The graph which compared the ventilation effect (humidity change in a shoe) of the ventilation waterproof shoe of this invention by a monitor (5), and the conventional ventilation waterproof shoe using a moisture-permeable / waterproof film. The graph which shows the statistical average value of the test result of monitors (1)-(5).

Manufacture of breathable waterproof material
Toray Operontex's "Lycra Ⓡ" as a polyurethane elastic fiber was previously water-repellent with a fluorine-based water repellent. Using this water-repellent treated polyurethane elastic fiber as a raw yarn, a breathable waterproof material having a thickness of 1.0 mm used in the present invention was manufactured. FIG. 1 is an enlarged view conceptually showing the organizational structure of the ventilation waterproof material and the function of the ventilation waterproof material to allow water vapor to pass through and water droplets to pass through. In FIG. 1, 1 is a weft of polyurethane elastic fiber and 2 is a warp of polyurethane elastic fiber. The polyurethane elastic fiber 1 and the polyurethane elastic fiber 2 intersect to form a space 3. The diameter of the space 3 is a range in which water vapor passes and water droplets do not pass, for example, micropores of 0.0004 μm to about 600 μm. The sphere 4 having a large diameter is a water droplet, and the sphere 5 having a small diameter is water vapor. FIG. 1 conceptually shows a state in which water droplets, which are spheres 4 having a large diameter, do not pass through the space 3, and water vapor, which is a small sphere 5, passes through the space 3. Since the micropores in the range where water vapor passes and water droplets do not pass are affected by various conditions such as environmental temperature, humidity, atmospheric pressure, and measurement method, 0.0004 μm to about 600 μm is not a critical value, but to the last. , Is an example as a guide.

Manufacture of upper
A commercially available waterproof double Russell with a thickness of 2.0 mm was used as the upper surface material, and a waterproof double Russell with a thickness of 1.0 mm was used as the upper backing material. The above-mentioned breathable waterproof material was inserted between the upper surface material and the upper back material, both were adhered, punched by a mold by a predetermined method, and sewn to manufacture an upper.

Manufacture of breathable waterproof shoes
FIG. 2 is a cross-sectional view showing a main part of a shoe manufactured by a predetermined method using the above-mentioned upper. The breathable waterproof shoe of the present invention has a structure in which the above-mentioned breathable waterproof material 8 is joined between the upper surface material 6 and the upper backing material 7. The upper surface material 6, the ventilation waterproof material 8, and the upper backing material 7 are bonded to each other and integrated, and the upper is inserted to almost the center of the insole 10 and the sole 11, and is joined to each other and integrated. Has been done.

Measurement of relative humidity in shoes

The breathable waterproof shoes of the present invention (hereinafter referred to as "the shoes of the present invention") manufactured in the examples and the conventional breathable waterproof shoes using a thin breathable / waterproof film having a thickness of 15 μm to 70 μm (hereinafter referred to as “conventional shoes”). The relative humidity in the shoes was measured. Conventional shoes were attached to the left foot of each of the five monitors (1) to (5), and the shoes of the present invention were attached to the right foot. At the same time as wearing, a temperature / humidity sensor was inserted between the foot inside the outside of the front instep and the upper lining to measure the relative humidity inside the shoe. FIG. 3 is a perspective view of the left foot showing the position 12 where the temperature / humidity sensor is arranged (the right foot is in the mirror image relationship of FIG. 3).

FIGS. 4-1 to 5 are graphs comparing the relative humidity changes in the shoes of the present invention and the conventional shoes.

FIG. 4-1 is a graph showing the test result of the monitor (1), FIG. 4-2 is a graph showing the test result of the monitor (2), and FIG. 4-3 is a graph showing the test result of the monitor (3). 4-4 is a graph showing the test results of the monitor (4), FIG. 4-5 is a graph showing the test results of the monitor (5), and FIGS. 4-6 are the monitors (1) to (5). It is a graph which shows the statistical average value of the test result of. In each graph, the vertical axis indicates the relative humidity (%), the horizontal axis indicates the time (minutes), the straight line indicates the relative humidity change in the shoe of the present invention, and the dotted line indicates the relative humidity in the shoe of the conventional shoe.

As shown in FIG. 4-1 in the case of the monitor (1), the relative humidity (straight line) in the shoe of the breathable waterproof shoe by the shoe of the present invention rises from 50% to 60% immediately after the start of measurement, and then measured. It is understood that it has remained within 60% over time over the final 80 minutes. On the other hand, the conventional shoes (dotted line) increased from 50% to about 75% in about 10 minutes from the start of measurement, and remained between 80 and 90% from about 30 minutes to 80 minutes after the end of measurement. It is understood that 80 minutes after the end of the measurement, the maximum difference between them is 32%, that is, the relative humidity in the shoe of the shoe of the present invention is 32% lower than that of the conventional shoe.

As shown in FIG. 4-2, in the case of the monitor (2), the relative humidity (straight line) in the shoe of the present invention becomes about 60% in about 30 minutes from the start of measurement, and is about 30 minutes to about 50 minutes. Then, it increased to around 70% and remained at that value until 80 minutes after the end of the measurement. The conventional shoes (dotted line) increased to 60 to 80% in about 50 minutes from the start of measurement, and increased to about 85% in about 80 minutes from the end of measurement. It is understood that after 80 minutes, the maximum difference between them is 17%, that is, the relative humidity inside the shoes of the present invention is 17% lower than that of the conventional shoes.

As shown in FIG. 4-3, in the case of the monitor (3), the relative humidity (straight line) in the shoe of the present invention changes between 50% and 60%, but that of the conventional shoe (dotted line). In the case, it increases between 55% and about 77%, and after 80 minutes, the maximum difference between them is 18%, that is, the relative humidity in the shoe of the present invention is 18% as compared with the conventional shoe. It is understood to be low.

As shown in FIG. 4-4, in the case of the monitor (4), the relative humidity (straight line) in the ventilated waterproof shoe according to the present invention changes between 60% and 70% from the measurement to 60 minutes. From 60 minutes to 80 minutes, it is slightly over 70%. On the other hand, in the case of conventional shoes (dotted line), it rises to around 70 to 90% from the start of measurement to 80 minutes, and after 80 minutes, the maximum difference between them is 20%, that is, ventilation waterproofing according to the present invention. It is understood that the relative humidity inside the shoe is 20% lower than that of conventional shoes .

As shown in FIG. 4-5, in the case of the monitor (5), the relative humidity (straight line) in the ventilated waterproof shoe according to the present invention drops to 70% to 63% from the start of measurement to 40 minutes. It has remained at about 62% from 40 minutes to 80 minutes. On the other hand, in the case of conventional shoes (dotted line), it increased from 70% to about 85% from the start of measurement to about 40 minutes, and remained around 85 to 90% until 80 minutes, and after 80 minutes. It is understood that the maximum difference between them is 27%, that is, the relative humidity in the shoes of the ventilation waterproof shoes according to the present invention is 27% lower than that of the conventional shoes.

FIG. 4-6 is a graph showing the statistical average value of the test results of the monitors (1) to (5).
As shown in FIG. 4-6, the relative humidity (straight line) in the shoe of the present invention shoe has been around 60% from the start of measurement to 80 minutes. On the other hand, in the case of conventional shoes (dotted line), it is understood that the increase is from 60% to about 80% from the start of measurement to about 40 minutes, and further increases to 80 to 85% until 80 minutes. It is understood that after 80 minutes, the maximum difference between them is 21.8%, that is, the relative humidity inside the shoes of the present invention is 21.8% lower on average than that of the conventional shoes.

As described above, the breathable waterproof shoe according to the present invention has a thickness of about 0.2 to 3.0 mm as a breathable waterproof material, using fibers obtained by imparting elasticity to various elastic fibers or non-elastic fibers by a predetermined method as raw yarn. A large number of micropores, for example, about 0.0004 μm to about 600 μm, which allow water vapor to pass through and water droplets to pass through, are perforated on the entire surface of the cloth in the range of Compared to conventional breathable waterproof shoes that use a moisture permeable waterproof film made of polytetrafluoroethylene, polyurethane, polyethylene, polypropylene, polyester, etc., the moisture permeable effect is maximized under the same conditions and the same usage mode. It can be improved by about 32% and about 21.8% on average, and is tougher and more durable than the conventional moisture-permeable / waterproof film having a thickness of 15 μm to 70 μm, which is very thin. Therefore, when it is fixed to the upper surface material and the upper back material, it completely follows their movements or shape changes, and in particular, in addition to the simple two directions of the vertical direction and the horizontal direction, a momentary stop or a change of direction, etc. Even if it is used for sports shoes used for intense exercise such as basketball, soccer, rugby, etc., or for long-term exercise such as jogging, marathon, etc., the thickness is very thin, 15 μm to 70 μm. It does not crack or break like a waterproof film. Therefore, sports shoes can be used not only for a wide range of shoes such as ordinary business shoes, jogging shoes, and daily shoes.

1 Polyurethane elastic fiber weft
2 Polyurethane elastic fiber warp
3 Space formed by intersecting polyurethane elastic fiber weft 1 and polyurethane elastic fiber warp 2
4 Water drops
5 water vapor
6 Upper surface material
7 Upper lining
8 Ventilation waterproof material
9 insole
10 Insole
11 Outsole
12 Place a temperature / humidity sensor to measure relative humidity inside the shoe Position outside the shoe that corresponds to the position inside the shoe

Claims (3)

Polyurethane-based elastic fiber, copolymer fiber of acrylonitrile and butadiene, block copolymer derived from polycarbonate and polyester glycol carbonate derived from bisphenol A, block copolymer fiber from high softening point polyester and low softening point polyester, core sheath by composite spinning of polyurethane and polyamide A group consisting of a type composite fiber, a polyether ester-based elastic fiber, an elastic fiber selected from the group consisting of a conjugated yarn of polyester and polybutylene terephthalate and a polymethylene terephthalate, or a group consisting of a polyester fiber, a polyamide fiber, and a filament yarn of nylon. After twisting the inelastic fiber selected from the above, it is heated and fixed, and the twist is untwisted to form a crimp to impart elasticity, elasticity, or bulkiness to the fabric using the inelastic fiber as the raw yarn. To form;
A breathable waterproof material having a thickness of 0.2 to 3.0 mm is produced by perforating a large number of micropores in the range of 0.0004 μm to 600 μm in diameter that allow water vapor to pass through and water droplets to pass through the entire surface of the cloth in the thickness direction. That; and
A method for producing a breathable waterproof shoe, which comprises inserting the breathable waterproof material between a predetermined upper surface material and an upper backing material, and fixing the breathable waterproof material to both the upper surface material and the upper backing material. .. The breathable waterproof shoe according to claim 1, wherein the thickness of the upper surface material is in the range of 0.2 to 5.0 mm, and the thickness of the upper back material is in the range of 0.2 to 5.0 mm. Method. The breathable waterproof shoe according to claim 1 or 2, wherein the raw yarn is subjected to a water-repellent treatment at the stage of the raw yarn, or is subjected to a water-repellent treatment at the stage of knitting on a fabric. How to manufacture.

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