JPH0732510A - Production of waterproof shoes - Google Patents

Abstract

PURPOSE:To impart sufficient waterproofness, in stitching waterproof shoe materials cut into a predetermined shape, by filling the gap between the shoe materials laminated at a joint part with a hot-melt resin material to stitch the joint part and bonding the stitched part by the hot-melt resin material. CONSTITUTION:As a shoe material for waterproof shoes, artificial leather wherein a waterproof resin film is formed on one surface of a fabric 10 of which the other surface is raised obtained by raising pile cloth or tricot or natural leather is used. When the artificial leather 1 is used, the raised surface develops design effect and water repelling function and a leather main body having a porous film as a waterproof film can develop sufficient waterproofness. After stitching, a laminated interface can be perfectly filled and integrated by melting. When a polyamide hot-melt resin tape is used as the hot-melt resin 2, the matching of the edge with the leather 1 is easy because of the shape of the tape and the appearance of shoes is not damaged by the melting treatment of the hot-melt resin tape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof shoe and, more particularly, to a method for manufacturing a shoe which imparts waterproofness to a seam stitch portion of a shoe material. The waterproof shoe material referred to in the present invention broadly means a shoe material having a certain degree of waterproofness such as artificial leather and natural leather.

[0002]

2. Description of the Related Art It has been conventionally practiced to sew a laminated waterproof shoe material made of a fiber base cloth and a resin film, which is generally called artificial leather, or natural leather to make a waterproof shoe. And in these conventional waterproof shoes, in order to compensate for the decrease in waterproofness of the seam at the seam of the artificial or natural leather, latex or soft adhesive resin is applied to the outer surface or the inner surface of the seam after the shoe is made. Applying, applying a waterproof tape from the inner surface of the stitched portion, water-repellent treatment on leather as shoe material, water-repellent treatment on the sewing thread used for suture, etc., individually or We carry out together.

[0003]

In the conventional waterproofing means as described above, if latex is applied to the outer surface of the sutured portion, the appearance of the shoe is impaired, and the inner surface is coated with resin or waterproofed. If a tape is applied, not only will the wearing comfort be poor, but also the waterproof performance and its durability will be insufficient. Further, even if a water-repellent treatment is applied to the seam portion and the suture thread of the leather, the waterproof property of the suture portion is considerably lower than that of the leather body.

The inventors of the present invention, in particular, when sticking a waterproof tape or applying an adhesive resin, are waterproof due to fine irregularities on the fiber base cloth surface of the waterproof shoe material or the surface of natural leather. It was clarified that the tape and the adhesive resin are not sufficiently adhered, and water penetrates into the space to reduce the waterproof property. As a result of further study by the present inventors, the space in which the waterproof shoe material and the natural leather are laminated in the stitched portion is sufficiently filled with the heat-meltable resin and sewn, and then the heat-meltable resin is melted. It was found that the waterproof property can be secured. The present invention aims to improve or eliminate the problems of the prior art based on the above research.

[0005]

Means for Solving the Problems The present invention provides a waterproof artificial leather or a natural leather composed of a fiber base cloth 10 and a resin film 11, which is cut into a predetermined shape as shown in FIG. When manufacturing waterproof shoes by stitching, stitching is performed with the heat-meltable resin tape sandwiched between the leather laminated at the seam, and then the heat-meltable resin tape is melted by heat treatment and stitched. The leather and the sewing thread of the part are integrally joined with resin. Therefore, in the seam portion, the polymerized interfaces of the leathers on both sides are bonded and integrated with the sewing thread by the molten resin, and the seam portion exhibits remarkably excellent waterproofness.

Further, as a shoe material for waterproof shoes, if artificial leather having a waterproof resin film formed on the other side of a cloth having raised hair on one side raised from pile fabric or tricot is used, It has a water-repellent function as well as a design effect. Therefore, even if a breathable porous film is used as the waterproof film, the leather body can exhibit sufficient waterproof property. Even in the sewn portion having the napped surface as an interface, the laminated interface of the sewn portion can be completely filled and integrated by melting the heat-fusible resin, and sufficient waterproofness can be imparted to the sewn portion.

If a polyamide-based heat-melting resin tape is used as the heat-melting resin material to be interposed in the seam, it is suitable in terms of adhesiveness, durability, handleability, and softness of the texture. Therefore, the edge of the shoe can be easily aligned with the leather and the appearance of the shoe is not impaired even by the melting process of the heat-meltable resin tape.

The waterproof shoes according to the present invention include waterproof shoe materials called so-called artificial leather, which are made of a fiber base cloth and a resin film, leather shoes manufactured using natural leather, police officers and It means a wide range of shoes such as half-boots worn by the Self-Defense Forces, sports shoes and the like, which require some degree of waterproofness.
Further, the waterproof shoe material or natural leather in the present invention may have water resistance of 2000 mm or more, and as a waterproof shoe, if the water pressure of the stitched portion is 800 mm or more, the rainfall amount is 15 mm / hr. Even if it is exposed to the rain for about 5 hours or soaked in water for 1 hour, there is no water entering inside the shoe, and the function as a waterproof shoe is fully exerted.

In the present invention, the term "sewn" refers to a general sewing type of shoes, and in these sewing types, a heat-melting property is obtained between waterproof shoe material and natural leather in which the stitched portions are laminated. After the resin is filled and sewn, the thermofusible resin is melted, so that the sewn portion can have significantly excellent waterproofness. Moreover, the space between the waterproof shoe material and the natural leather laminated in the sewn portion refers to a gap and a seam portion which serve as a passage for water from which water enters from the outside.

The heat-fusible resin used in the present invention includes polyamide type, polyester type, polyethylene type,
A low melting point synthetic resin adhesive such as polyurethane, polyvinyl chloride, polyvinyl acetate or acrylic can be used. From the viewpoint of adhesiveness, durability, handleability, softening of texture, and the like, polyamide-based materials are preferable. Further, the form thereof is not particularly limited as long as it is a form in which it is easy to fill and sew between the waterproof shoe material or the natural leather laminated at the seam, but the heat-meltable resin form is a film form or a spun bond. A tape-like material such as a shape, so-called "web-like" is suitable. The weight of the tape-like material is 100-500g
/ M ² is preferable, and if it is 100 g / m ² or less, it is not possible to sufficiently fill the gaps and seams between the waterproof shoe materials. When the basis weight is 500 g / m ² or more, the melting condition becomes severe, and not only the product quality becomes poor due to the long heating time, but also the texture becomes hard due to a large amount of the solidified resin. 5 to 20 mm width suitable for tape
Suitable width is 10 to 15 mm
It is of width. If the width is less than 5 mm, it is insufficient to make up for the filling part sufficiently.

In particular, unlike the conventional sealing tape in which the adhesive resin is attached to one side of the cloth, the heat-fusible resin of the present invention contributes to adhesion by the entire resin used and is suitable for the laminated edge of the leather. If it is matched with the above, it is characterized in that it is included in the waterproof shoe material laminated at the seam portion and externally gives the seam portion similar to a normal stitched state to the front side and the back side. As a method of melting the heat-meltable resin, an iron, a press, a trowel, a hot-pressing apparatus used for ordinary sewing such as a roller hot air melting apparatus can be used, and the method is not particularly limited.

In the present invention, it is preferable to use in combination with a conventional sealing tape or to make the sutured portion water repellent in order to impart higher waterproofness. Further, it is more preferable that the other seams and the design are subjected to the waterproof property improving treatment. For example, as the sealing tape, it is preferable to use a hot-melt adhesive type sealing tape which can be adhered at a low temperature in combination. The type of tape base material, adhesive, etc. is not particularly limited, but a material that keeps the texture of the stitched portion soft and has good adhesiveness and good durability against changes in temperature and humidity environment is suitable.

Water repellent treatment of the sutured portion is carried out by applying a water repellent such as fluorine or silicon by dip-nip method, spray method, brush coating method, or heat-melting resin. A method of impregnating a water repellent agent is also applicable, and the method is not particularly limited. In addition, the design of waterproof shoes is not a structure in which the tongue part is separated, but a box-shaped shoe tongue structure that is integrated with the shoe body up to the upper part of the shoe. By doing so, it is possible to further secure waterproofness.

The fiber base fabric useful in the present invention includes woven and knitted fabrics,
There are non-woven fabrics, which can be applied to any of them. Natural materials such as cotton and wool are also used as materials, regenerated fibers such as rayon and cupra, synthetic fibers such as polyamide-based, polyester-based and acrylic-based, and further It may be a composite fiber of them and is not particularly limited. However, in terms of wearing comfort, soft texture, elasticity,
A fiber base cloth having hygroscopicity is preferable. Further, the natural leather is not particularly limited, and any leather that is generally used for shoes and has excellent water resistance of the leather itself may be used.

In particular, in the present invention, a fiber base cloth having a large thickness in order to prevent water from entering further, or a fiber base cloth having a large unevenness on the surface thereof, for example, a napped nap raised by pile cloth or tricot etc. They are suitable for products, and these cannot be completely filled with the conventional sealing tape or the resin coating, etc., so that waterproofness cannot be expected at all. The resin film includes a porous film and a non-porous film, and rubber-based, polyurethane-based, polyacrylic-based, polyamide-based, polyvinyl chloride-based, polyfluorine-based polymers and the like are used. Polyurethane-based polymers, especially polycarbonate-based polyurethanes are preferable because the thickness of the resin film can be reduced. Moisture permeability is 2500 g / m ² ·
It is preferably 24 hours or more, preferably 4000 g / m ² · 24 hours or more. The thickness of the resin film is 100 μm
The following is preferably 20 to 50 μm.

As a method for forming the resin film on the fiber base cloth, there are coating and laminating methods. The adhesive used in the laminating method is preferably a polyurethane-based polymer, but a polyacrylic-based, polyester-based, polyamide-based, polyvinyl chloride-based, polyvinyl acetate-based polymer or the like can also be used. In the method of the present invention, a resin film is used as the surface, and a fiber base cloth constituting the waterproof shoe material has large surface irregularities or a thick thickness, and waterproof shoe material having a water pressure resistance of 10000 mm or more or natural leather is used. Suitable in some cases.

[0017]

EXAMPLES The present invention will be specifically described below with reference to examples, but the present invention is not limited to these examples. In addition, the waterproofness measurement shown in the examples is based on JIS L.
-1092 water resistance test and rain test. Example 1 (FIG. 1) A waterproof shoe material 1 was obtained by using a single-side raised fabric 10 made of polyester fiber as a fiber base fabric and adhering a 50 μm thick polyurethane resin film 11 on the non-raised face. The waterproof shoe 1 had a water pressure resistance of 10,000 mm. Two pieces of this waterproof shoe material 1 were cut into a predetermined shape and sewn by the sewing method shown below. A polyamide-based heat-meltable resin tape 2 having a width of 10 mm along the seam allowance W on the sewing side of one of the cut pieces 1.
(Dia Span (registered trademark) Daicel Chemical Co., Ltd.
A basis weight of 300 g / m ² ) is placed on top of this, and the other cutting piece 1 is placed thereon, and the tape 2 is polymerized so that it does not protrude from the edge of each cutting piece, and the lockstitch sewing machine (sewing needle ^# 20, sewing thread ^# 8) was sewn 3 and the heat-meltable resin tape 2 laminated at the seam W was heat-pressed and melted with an iron (temperature 150 ° C., time 20 seconds) to obtain a waterproof shoe suture.

Example 2 (FIG. 2) Using the waterproof shoe material of Example 1, only the stitching method was changed.
That is, as shown in FIG. 2, the stitched edges of both cut pieces are abutted against each other and joined by a zigzag overlock 4, and then a heat-melting resin tape 2 is placed so as to cover the abutting line.ゝ Attach the cover piece 1'made of wide waterproof shoes to the resin tape 2
After being placed on the top and subjected to the stitch 5, the same treatment as in Example 1 was performed to obtain a waterproof shoe sutured product. Example 3 A waterproof shoe sutured product was obtained by suturing in the same manner as in Example 1 except that natural cowhide (water pressure resistance 2000 mm) was used. In addition, as shown in FIG.
Further, by applying a bottom stitch to fold and apply the lock stitch 5, a design effect can be exhibited by the bottom edge.

Comparative Example 1 A sutured article according to Example 1 was obtained without filling the sewn portion with the hot-melt resin. Comparative Example 2 A waterproof tape (hot-melt adhesive tape, Sun Kasei Co., Ltd., base cloth nylon 6) was attached from the back surface of the sewn part of Comparative Example 1 with an iron (140 ° C., time 15 seconds). ,
A waterproof shoe suture product according to Comparative Example 1 was obtained.

The results of measuring the waterproof performance of the sutured products of Examples 1 to 3 and Comparative Examples 1 and 2 are shown in Table 1. As can be seen from these results, each of the Examples has a waterproof property of the sutured portion. It was a very good one.

[0021]

[Table 1]

[0022]

In the sewn portion of the waterproof shoe material 1, since the heat-melting resin melts between the sutured leathers to integrally bond the front and back leathers and the sewing thread, there is a gap at the laminated interface of the sewn portion. Is not present at all, and therefore the sutured portion can be provided with sufficient waterproofness. Further, since the heat-melting resin material is sandwiched and sewn and then melted, even if the interface of the leather is an uneven surface or a napped surface, complete welding integration is possible.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of lap stitches for carrying out the present invention.

FIG. 2 is a cross-sectional view that uses abutting stitches and stitch press stitches together for implementing the present invention.

FIG. 3 is a cross-sectional view of a sew-on stitch for implementing the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Waterproof shoe material (leather) 1 '... Cover piece 2 ... Thermofusible resin material 3, 4, 5 ... Seams 10 ... Raised cloth 11 ... Resin film

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masami Kamiya 3-6-75 Koyodai, Kawanishi City, Hyogo Prefecture

Claims (2)

[Claims] 1. A waterproof shoe material (1) cut into a predetermined shape.
When a waterproof shoe is manufactured by sewing seams, a hot-melt resin material (2) is filled between the laminated shoe materials (1) at the seam, and the seam is sewn, and then the heat is applied. A method for manufacturing a waterproof shoe, which is characterized in that the sutured portion is waterproofed by fusion bonding with a fusible resin material. 2. As the shoe material (1), artificial leather having a waterproof resin film formed on the other surface of the cloth having raised hair on one surface is used, and a polyamide-based hot-melt resin tape is used as the heat-melt resin material. The manufacturing method according to claim 1.