JPH11332610A - Waterproof shoes - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent water from permeating through an interior material such as instep lining or inner sole member even when water permeates through a seam by stopping the seam on a face lower than an end part of a sole without crossing the inner sole member or instep lining at the lower peripheral edge part of an instep cover and the sewn seam. SOLUTION: Concerning waterproof shoes with which the sole is abutted to the lower surface of the bag-shaped instep cover sewing the instep cover and the inner sole, the sewing part of a front instep member composing the instep cover is sealed on its rear side and, concerning the sewing part of the front instep member, the sewing part of the front instep member toward the lower peripheral edge part of the instep cover stops its seam on the face lower than an end part 9 of the sole. At the same time, sewing is stopped without crossing a seam 8 sewn with the inner sole member or instep lining at the lower peripheral edge part of the instep cover.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof shoe having a bag cover, and more particularly to a waterproof shoe whose sole is formed by injection molding or injection molding.

[0002]

2. Description of the Related Art As a method of sealing a sewn portion of a shoe upper that requires waterproofness, a water-repellent thread may be used as a sewing thread,
There are methods such as applying a water repellent to the seam, attaching a waterproof tape to the back of the seam, and applying a waterproof liquid to the seam. These methods are implemented in combination.

[0003] Even when the waterproofing method is adopted, in an injection-molded shoe having a bag shell to which a shell and an insole are sewn, water penetrates along the thread of the sewn portion of the shell material, Water crossed the interior materials such as the midsole material and the back material and water penetrated into the thread inside, and the waterproofness was not perfect.

In addition, it is necessary to take measures such as applying a water repellent, applying a waterproof tape to the back of the seam, or applying a waterproof liquid to the seam at the seam of the seam. It was a load.

[0005]

SUMMARY OF THE INVENTION The waterproof shoe of the present invention is intended to complete the sealing of the seam at the seam of the bag cover, and to simplify the steps required for waterproofing.

[0006]

SUMMARY OF THE INVENTION A waterproof shoe according to the present invention is a waterproof shoe in which a shoe sole is abutted on the lower surface of a bag shell to which a shell and an inner sole are sewn. The sewn portion of the top material is sealed on the back surface, and among the sewn portions of the top material, the sewn portion of the top material toward the lower peripheral portion of the cover has a seam of the shoe sole. It is sewn on the lower side from the forehead,
The stitches are sewn without intersecting the seams sewn to the insole material and the back material at the lower peripheral portion of the shell.

Further, in the waterproof shoe of the present invention, in the waterproof shoe, a shell material constituting a shell has a thermoplastic synthetic resin laminated on a back surface thereof, and a sewing portion of the shell material is
The seam is sealed by heating and melting the thermoplastic synthetic resin.

It is desirable that the sole is a sole formed by injection molding or injection molding. As the sole material, a thermoplastic resin such as polyvinyl chloride or thermoplastic rubber, or a foamed polyurethane obtained by foaming and curing a mixture of a polyol solution and a polyisocyanate solution is used. In that case, the waterproof shoe of the present invention is that the shoe sole material is injection-molded or injection-molded in the final sole-forming gap formed by combining the last in which the bag cover is suspended, the sole mold, and the side mold. To manufacture more.

In the waterproof shoe according to the present invention, among the sewn portions of the upper surface material, the sewn portion of the upper surface material toward the lower peripheral portion of the upper cover is
This is a portion where the upper and lower surfaces are overlapped or sewn, or a region where the upper and lower surfaces are split and sewn. Of the sewn portions of the shell material, the sewn portion of the shell material toward the lower peripheral portion of the shell is the sewn portion of the front part and the waist part of the shell material, and the outer moon of the shell material. It is a sewing part between a mold part and a waist part, a sewing part between a front decoration part and a front part of a shell material, and a sewing part of a heel string part and a waist part of a shell material.

The shell material used in the waterproof shoe of the present invention is a water-impermeable, waterproof material that does not allow water to enter the surface and the inner surface, such as synthetic leather, artificial leather, and water-repellent leather. It is preferable that a thermoplastic synthetic resin is laminated on the back surface of the shell surface material. In this case, the melting point of the thermoplastic synthetic resin is preferably 80 to 120 ° C. in order to melt by heating and seal the thread, and the material is polyester,
Materials such as polyamide, polyethylene and EVA are selected.

[0011]

In the waterproof shoe of the present invention, when worn after molding, the seam toward the lower peripheral portion of the upper of the upper of the upper of the upper of the upper of the upper of the upper of the upper of the upper of the upper of the upper of the upper of the upper part of the interior of the shoe. Since there is no intersection with the seam (insole bottom stitch, lower press stitch, etc.)
Even if water infiltrates along the thread, water does not penetrate the interior material such as the backing material, midsole material, counter material, etc.
No water enters the shoes.

[0012] Since a thermoplastic synthetic resin is laminated on the back surface of the shell material used in the waterproof shoe of the present invention, in the sewing process, the seam of the waterproof shell material is bonded by thermocompression bonding. The thermoplastic resin laminated on the back of the shell material melts and completely seals the needle hole of the sewing thread, so it has good waterproofing, reduces the load of the process of attaching waterproof tape, and complete waterproofing. Become.

[0013]

[Example] [Shoes of Example] Sewing of a bag shell As artificial skin material, artificial leather in which a polyurethane impregnated non-woven fabric base was coated with polyurethane skin was prepared, and a polyethylene resin film having a melting point of 100 ° C. and a thickness of 60 μm was laminated on the back surface of the artificial leather. After cutting the front part and the waist part of the laminated shell surface material, after sewing the shell with the cut back material and other parts,
An insole was sewn to the lower edge of the shell to obtain a bag shell.

At this time, as shown in FIG. 2, the sewn portion of the front part and the waist part of the shell part is formed by folding the inner back of the waist part and folded inward, and the overlapping part with the front part is double-stitched. Then, in the sewing process, inside the sewn part of the tip part of the shell surface material and the waist part,
The waterproof tape was sealed by thermocompression bonding. Also, as shown in FIG. 1, the lower end of the seam of the sewn portion is positioned lower than the small edge of the shoe sole at the time of injection molding so as not to intersect with the sewing thread of the insole or the lower presser stitch. Stitched with.

2. Molding of waterproof shoes Hang the bag cover on the last and heat-set. A liquid polyurethane in which a polyol and a polyisocyanate are mixed is injected and molded into the shoe sole forming gap formed by combining the above, foaming and curing are performed, and the bag shell and the shoe sole are integrally formed, as shown in FIG. A waterproof shoe of such an embodiment was obtained.

[Shoes of Comparative Example] Sewing of bag shells Artificial leather having the same specifications as in the working example was used as a shell material, and a 60-micron polyethylene resin film having a melting point of 100 ° C. was laminated on the back surface of the artificial leather. The laminated shell surface material is cut into a front part and a waist part, a shell is sewn together with the cut back material and other parts, and an insole material is sewn to a lower peripheral edge of the shell to cover a bag. I got

At this time, as shown in FIG. 6, the sewn portion between the front part and the waist part of the shell part is formed by folding the inner back of the waist part and folded inward, and the overlapping part with the front part is double-stitched. In the sewing process, a waterproof tape was thermocompression-bonded to the inside of the sewn portion between the tip part and the waist part to seal it. Further, as shown in FIG. 5, the lower end of the seam of the sewn portion was sewn off so as to intersect with the sewing thread of the insole bottom stitch and the lower press stitch.

2. Molding of Waterproof Shoes The bag cover of the comparative example was hung on the last and molded by the same manufacturing method as the shoes of the example to obtain the waterproof shoes of the comparative example.

[Comparison of Water Leakage Test of Example Waterproof Shoes and Comparative Example Waterproof Shoes] The waterproof shoes of the example and the waterproof shoes of the comparative example are put in a container, and water is added so that the water depth becomes 2.5 cm. After immersion for about 4 hours, it was examined whether water leaked into the shoes, and the following results were obtained. From this result, it is clear that the waterproof shoes of Examples are excellent in waterproofness.

[0020]

[Table 1] * Water leak test conditions: 4H immersion time, 2.5cm depth

[0021]

The waterproof shoe according to the present invention is a waterproof shoe in which the sole is abutted against the lower surface of a bag shell in which a shell and an insole are sewn. The back surface of the seam portion is sealed, and the seam portion of the seam surface material heading toward the lower peripheral portion of the seam of the seam portion of the seam surface material has a seam lower than the small edge portion of the shoe sole. The seam is sewn without crossing the seam sewn to the midsole material and the back material at the lower peripheral edge of the cap, so even if water penetrates through the seams, Water does not seep into the interior materials such as the floor and the midsole, and the waterproofness is perfect.

In the waterproof shoe according to the present invention, the upper material constituting the upper cover has a thermoplastic synthetic resin laminated on the back surface thereof, and the sewn portion of the upper material is formed by heating the thermoplastic synthetic resin. Since the seam is sealed by melting, the waterproofness is more complete. Also, the steps of applying a waterproof tape to the back surface of the seam of the shell and applying a water repellent to the back surface of the seam of the shell are reduced.

[Brief description of the drawings]

FIG. 1 is a partially enlarged view of a sewn portion of a shell material of a waterproof shoe according to an embodiment.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a cross-sectional view of a sewn portion of a shell material of a waterproof shoe according to another embodiment.

FIG. 4 is a partially enlarged view of a sewn portion of a shell material of a waterproof shoe of a comparative example.

FIG. 5 is a sectional view taken along line BB of FIG. 4;

FIG. 6 is a perspective view of the waterproof shoe of the embodiment.

[Explanation of symbols]

1. Waist parts of the shell material 2. Top part of the shell material 3. Sewing thread 4. 4. Thermoplastic resin film Waterproof tape 6. 6. The seam at the seam between the top part of the shell and the waist part of the shell 7. A seam stop at the lower end of the sewn portion between the front part of the shell and the waist part of the shell. 8. The seam at the seam of the insole and shell Small part of sole 10. Sole 11. Waterproof shoes

Claims (5)

[Claims] In a waterproof shoe in which a shoe sole is abutted on the lower surface of a bag upper having a shell and an inner sole sewn, a sewn portion of a shell surface material constituting the shell has a back surface. Sealed, among the sewn portions of the above-mentioned upper surface material, the sewn portion of the upper surface material heading toward the lower peripheral portion of the upper cover has its seam sewn on the lower surface from the small edge portion of the shoe sole, A waterproof shoe characterized by being sewn without intersecting with a seam sewn to an insole material or a lining material at a lower peripheral portion of a shell. 2. The waterproof shoe according to claim 1, wherein the upper material constituting the upper cover has a thermoplastic synthetic resin laminated on the back surface thereof, and the sewn portion of the upper material is the thermoplastic resin. A waterproof shoe characterized in that seams are sealed by heating and melting a synthetic resin. 3. The waterproof shoe according to claim 1, wherein said sole is a sole formed by injection molding or injection molding. 4. The waterproof shoe according to claim 1, wherein, among the sewn portions of the upper surface material, the sewn portion of the upper surface material toward the lower peripheral portion of the upper cover is a lower surface material and a lower surface material. A waterproof shoe characterized by being a portion where materials are overlapped and sewn or a portion where a top material and a top material are split and sewn. 5. The waterproof shoe according to claim 1, wherein the upper material is a waterproof material such as synthetic leather, artificial leather, and water-repellent leather.