JP4588354B2 - Waterproof shoes and manufacturing method thereof - Google Patents

Description

  The present invention relates to a waterproof shoe in which a shoe sole is formed and integrated by an injection molding method on an upper which is provided with a bag-like, water-resistant bag upper on the inner side of the outer upper, and temporarily from the surface of the upper The present invention relates to a waterproof shoe having a structure that prevents feet and socks from getting wet even when water enters.

  Nowadays, when roads are maintained and there is almost no puddle of mud, people don't wear rubber or synthetic shoes even on rainy days, but wear casual shoes. Under such circumstances, there is an increasing demand for waterproofing casual shoes.

  In order to give waterproofness to casual shoes, as shown in Fig. 7, the upper is covered with a front cover, a waterproof layer and a back cover, and the bottom edge of the waterproof layer is made of rubber or synthetic resin. However, water that has penetrated into the upper cover may penetrate into the shoe interior from the stitches of the sewing thread. In the case of waterproof shoes that are made by joining the soles made in separate processes to the upper with an adhesive, the adhesive between the upper and the sole is increased, and water is generated between the two. It is conceivable to achieve waterproofness by preventing a permeation flow path. However, an increase in the amount of adhesive causes an increase in the time required for the bonding operation, and above all, it is difficult to completely eliminate the risk of forming a narrow flow path between the two due to variations in the application of the adhesive. In order to solve the problems of the stitched seam and the narrow flow path, it is known that the upper is made into a double structure by providing a foot-shaped, bag-like, water-stopping bag upper on the inner side of the outer upper. It has been.

  However, it is an important factor for the feeling of wearing that the toe side area of the shoe tends to bend according to the ground contact state of the toe side area of the foot, and this area has a large horizontal load during walking and running. It takes. In other words, when the upper is made of a double structure, the portion of the bag upper that contacts the shoe sole side is damaged by such bending or horizontal load, and there is a problem that the water stoppage is impaired.

The so-called injection, in which a previously manufactured upper is covered with a last mold, and a space for molding a shoe sole is formed by this upper and the side and bottom molds, and the sole material is filled in this space. It is known to form and integrate a shoe sole on the upper by a molding method. In addition, as a means for forcibly contacting the upper after the upper is covered with a last mold, there is known a technique in which a large number of loops are attached to the lower periphery of the upper and narrowed down with a string passing through the loop.
JP-A-6-70804 Japanese Patent No. 3402688

  An object of the present invention is to provide a waterproof shoe with improved waterproofness in the toe side region, and further to reduce the weight of the waterproof shoe.

The waterproof shoe of the present invention is a waterproof shoe composed of an outer cover, a water-resistant bag cover, an insole cloth, and a shoe sole, and the upper cover is open on the mouth side and the shoe bottom side. It is foot-shaped, and the bag cover is foot-shaped and bag-shaped with the mouth side opened, and the bag cover is foot-shaped and bag-shaped with the foot opening opened, The hood and the sack are covered with the sack on the inside of the front sash, and both are sewn around their respective mouths. The insole cloth does not exist in the toe side area and is on the heel side. In the region, it is stitched to the lower periphery of the upper shell, and the shoe sole is formed by injection molding at least in the toe side region and is integrally joined to the bag upper.
In addition, the method of manufacturing the waterproof shoe of the present invention, stitches the midsole cloth to the lower margin of the upper cover so as to close the toe side area of the opening on the side of the upper cover shoe bottom, A shoe sole that is formed by injecting the sole material to at least the toe side region where the insole cloth is not present, and joining and integrating with the instep cover as the sole of the case where the outer cover, the bag upper and the insole cloth are stitched together It is the structure which forms.

Further, in the waterproof shoe of the present invention, there is a part in which the shoe sole by the injection molding method is not formed in the heel side region in the upper part made up of the outer cover and the bag cover, and the heel manufactured separately in the part. The side shoe sole may be bonded, and the heel side shoe sole may be made of a foam .

  The waterproof shoe of the present invention has a configuration in which the shoe sole is formed by injection molding in a toe side region where the bag back is easily damaged, and is integrally joined to the bag back. Compared with the case where the bag upper and the shoe sole are joined in the work (or machine work), both are joined uniformly. The reason why the two are homogeneously joined is considered to be that the fluid shoe sole material solidifies while being in contact with the bag upper cover at almost the same pressure by the injection molding method. Therefore, in the waterproof shoe of the present invention, even if a displacement stress occurs between the bag upper and the shoe sole, the force is dispersed throughout the bag without concentrating on one place. It is hard to take such damage. And the insole cloth provided in the heel side area has a role of a stopper (positioning role) so as not to cover too much when the upper is covered on the last mold.

  In addition, the applicant of the present invention pays attention to the fact that the heel side region is a portion in which the bag shell is difficult to be damaged, and it is not necessary to form and integrate the shoe sole by the injection molding method unlike the toe side region. In the side region, a portion where a shoe sole is not formed by an injection molding method, which is difficult to reduce in weight, is provided, and a separately prepared lightweight heel side shoe sole is provided to make the shoe lighter.

  The present invention will be specifically described based on the waterproof shoe of the embodiment. The waterproof shoe of the present invention is formed by stitching a bag upper 2 as shown in FIG. 1 and a front upper 3 as shown in FIG. 2 around the respective wearing mouths as shown in FIG. 3, and as shown in FIG. The insole cloth 4 is sewn and provided on the heel side region of the cover, and a large number of loops 5 are attached to the toe side region of the front cover, and the upper 7 having the strings 6 provided in these loops is produced. As shown in FIG. 5, the upper 7 is put on the last mold 10, and then the upper is brought into close contact with the last mold by tightening with the string 6, and at least the toe side region of the shoe sole is formed by an injection molding method. Has been. In the waterproof shoe 1 of the embodiment, as shown in FIG. 6, a portion where the shoe sole 8 by the injection molding method is not formed is provided in the heel side region, and a lightweight heel side shoe sole 9 is bonded to the portion. The shoes themselves are lightened by bonding with the agent.

  As shown in FIG. 4, the waterproof shoe of the present invention is configured such that the insole cloth 4 is not present in the toe side region. By doing in this way, the shoe sole 8 by the injection molding method is formed and integrated with the bag upper 3 in the toe side region. The non-existing portion of the insole cloth in the toe side region is preferably about 25 to 55% of the shoe length from the tip of the nail. If the insole portion of the insole cloth is less than 25% of the nail tip, improvement in the durability of the bag shell cannot be expected so much, and if it is over 55% of the nail tip, injection molding of the shoe sole is performed. Sometimes it becomes difficult to make the upper cover (especially the stepped part of the upper cover) adhere to the last mold, so there is a possibility that the shape of the upper cover cannot be determined in a good state. In the waterproof shoe of the embodiment, the non-existing portion of the insole cloth in the toe side region extends to the position of 42% of the shoe length from the tip of the nail.

  As shown in FIG. 4, a large number of loops 5 are attached to the lower periphery of the upper case 3 by edge stitching with an overlock sewing machine in the toe side region, and strings 6 are placed in these loops. It goes through like turning around twice. The position where the string comes out from these loops is preferably about 30 to 55% of the length of the shoe from the tip of the nail. If this position is less than 30% or more than 55% from the tip of the nail, it is difficult to closely contact the step of the upper cover to the last mold during the injection molding of the shoe sole. May not be determined in a good state. In the waterproof shoe of the embodiment, the position where the string comes out from a number of loops is 45% of the length of the shoe from the tip of the nail.

  In the waterproof shoe according to the embodiment, the upper cover is configured to be fastened with strings provided in a number of loops in the toe side region. By adopting this configuration, the toe side region is in the absence of the insole fabric, so that it is possible to join and integrate the bag upper and the shoe sole by the injection molding method as follows. The problem is also solved. In other words, the bag cover is formed so that the outer dimension of the bag upper is slightly larger than the inner dimension of the upper cover so that there is no gap between the cover and the upper cover when the shoe is completed. Due to the presence of the cover, there is a part where the upper cover and the last mold do not adhere to each other, and if the shoe sole is formed by injection molding in this state, this part appears to be distorted and it can not be a shoe with good appearance It is a problem to say.

  The bag upper 2 has a foot shape and a bag shape with an opening on the side of the mouth, is processed so that water does not penetrate inside, and at least the toe region on the outer surface is joined to the shoe sole by an injection molding method. If there is no particular limitation. In the embodiment, the bag shell 2 is cut so that a sheet having a waterproof layer as an outer layer, an elastic layer as an intermediate layer, and a backing cloth layer as an inner layer is cut into an appropriate shape, and the cut surfaces are abutted with each other. By doing so, it is produced in the above-mentioned shape. And the waterproofing process is given to this stitched location (seam 15) by sticking the waterproof tape 16 to the outer layer. The outer layer is a layer for blocking water, and a 30 μm synthetic resin (polyether polyurethane) film is used. The elastic layer is a layer for improving comfort, and a 2 mm flexible polyurethane foam is used. The layer is a layer that protects the elastic layer and uses a brushed tricot material.

  As the upper cover 3, those generally employed conventionally can be used. For example, natural leather, synthetic leather, artificial leather, natural fibers such as cotton and synthetic fibers such as polyester, woven fabric, knitted fabric, mesh material, etc. can be freely selected and stitched into a foot shape with the mouth and shoe sole sides open Can be used. The toe side region on the lower periphery of the upper shell extends downward compared to the heel side region. A number of loops 5 are attached to the extended portion 17, and the strings 6 are passed through these loops. By forming the extended portion 17, if the upper cover 3 is fastened with the string 6, the upper cover is brought into close contact with the last mold.

  As the insole cloth 4, those conventionally employed in general can be used. For example, a woven fabric, a knitted fabric, a nonwoven fabric, a mesh material or the like made of natural fibers such as cotton or synthetic fibers such as polyester can be selected and cut. The insole cloth is produced so that its shape matches the shape of the bottom surface of the last mold, but it is not always necessary to provide it in the entire heel side region, and may be partial. It is preferable to adhere both with an adhesive at the part where the insole cloth and the bag upper are in contact with each other. In addition, as the insole cloth, if the mesh material is used so that the shoe sole material used for injection molding reaches the bag upper or if the insole cloth itself is perforated, the shoe sole and the bag cover Can be joined without using an adhesive.

  As the material of the shoe sole 8 by the injection molding method, those conventionally used for the injection molded shoe sole can be used. Specifically, a foamable or non-foamable material having elasticity such as a soft vinyl chloride resin, a thermoplastic elastomer, or a rubber material can be used. In particular, a material using a soft vinyl chloride resin has a high creep property because it uses a plasticizer to make it soft, so that the flexibility of the shoe sole can be improved. Further, from the viewpoint of reducing the weight of the shoe sole, a foamable material to which a microcapsule type foaming agent or a pyrolytic chemical foaming agent is added is preferable. The material of the shoe sole by the injection molding method preferably has a flexural modulus (JIS-K7171) of 0.1 to 3 Mpa in order to enhance the flexibility of the toe side region.

  The heel side shoe sole 9 is preferably an ethylene-vinyl acetate copolymer or polyethylene foam having a cushioning property even at a low specific gravity (specific gravity 0.1 to 0.4) and a relatively high flexural modulus. The use of such a foam is effective for reducing the weight of the shoe itself, considering that it is difficult for the shoe sole by injection molding to have a specific gravity of 0.6 or less. The heel side shoe sole is formed by heating a resin such as ethylene-vinyl acetate copolymer and / or polyethylene to which a crosslinking agent, foaming agent, filler, or other additive is added and kneaded with a mold or the like. It is possible to use a method of forming into a desired shape by foaming and cutting, or by cooling with a molding die after heating and compression. Further, the material of the heel side shoe sole preferably has a bending elastic modulus of 2 to 20 Mpa and a higher value than the material of the shoe sole by the injection molding method in order to enhance the holdability of the foot.

  Although the waterproof shoe of the present invention has been described above, a separately manufactured grounding bottom may be provided on the grounding surface side in order to improve the abrasion resistance and anti-slip property of the shoe sole.

The perspective explanatory drawing of a bag back. FIG. The perspective explanatory drawing of the aspect which sewn the upper cover and the bag cover around each wear mouth. A perspective view of the upper Explanatory drawing of the process of forming the shoe sole by the injection molding method on the upper Side surface explanatory drawing of the waterproof shoes of embodiment. Explanatory drawing of a well-known technique.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Waterproof shoes 2 Bag upper 3 Front upper 4 Insole cloth 5 Loop 6 String 7 Upper 8 Shoe sole 9 by the injection molding method Sole side sole 10 Last mold 11 Bottom mold 12 Side mold 13 Cavity 14 Injection port

Claims (3)

A waterproof shoe consisting of an outer cover, a water-resistant bag upper, an insole cloth, and a shoe sole,
The front cover is a foot-shaped thing that the mouth side and the shoe sole side open,
The bag upper is a foot-shaped and bag-like shape with an opening on the mouth side,
The front and back covers are: the back cover is attached to the inside of the front cover, and both are stitched around their respective mouths,
The mid-sole cloth is not sewn in the toe side region, but is sewn to the lower margin of the upper shell in the heel side region,
A waterproof shoe, wherein the shoe sole is formed by an injection molding method at least in the toe side region and is integrally joined to the bag upper. There is a part that does not form a shoe sole by an injection molding method in the heel side region, and a separately manufactured heel side shoe sole is bonded to the part, which is composed of a front upper cover and a bag upper cover , The waterproof shoe according to claim 1, wherein the heel side shoe sole is made of a foam . A method for producing a waterproof shoe comprising an outer upper, a water-resistant bag upper, an insole cloth, and a sole,
Attach a foot-shaped and bag-shaped bag upper that opens on the side of the mouth to the foot-shaped outer cover that opens on the side of the shoe mouth and the shoe sole, and sew both of them around their respective mouths.
Sew the insole fabric to the lower margin of the upper shell so as to close the toe side region of the opening on the side of the upper shoe upper and close the heel region,
A shoe sole that is formed by injecting the sole material into at least the toe side region where the insole cloth is not present, and joining and integrating with the instep cover as the sole of the case where the front cover, the bag cover and the insole cloth are stitched together Forming a waterproof shoe.

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