JP2003061703A - Sole and its preparation process - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sole which is generally called a compression sole prepared by adhering a lower sole made of a rubber, an elastomer or the like to the bottom surface of an upper sole made of a foam or the like, is prepared at a low cost without using a special material which raises the material cost and needing a complex preparation process, and is excellent in the cushioning effect and design. SOLUTION: The sole 1 of this invention comprises an upper sole 4 which is integrally formed by a heat compression molding of a core 2, a bottom 3a covering the bottom of the core 2, and a cover 3 having a side 3b covering the side of the core 2, and a lower sole 4 adhered to the covered bottom 3a of the upper sole 4. The core 2 and the cover 3 of the upper sole 4 are adhered and integrated through a heat-seal adhesive layer 7 at the bottom of and the side of the core 2.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a shoe sole and a method for manufacturing the same.

[0002]

2. Description of the Related Art A shoe sole, which is generally called a compression sole, has an ethylene-vinyl acetate copolymer (hereinafter referred to as EV).
A lower bottom (usually called an outsole) made of rubber or elastomer is attached to the bottom of an upper bottom (usually called a midsole) made of foam such as A). Is formed. Conventionally, the upper sole of this kind of shoe sole is made by cutting foam such as EVA into a shoe sole shape.
This is used in which a rising portion is formed at the peripheral edge by heating / pressurizing this in a mold. Usually, various design patterns are applied to the outer surface of the side surface including the rising portion of the upper sole at the same time when the upper sole is molded, for the purpose of giving the shoe a high-class appearance.

[0003]

Generally, a shoe sole is required to have a sufficient cushioning property and the cushioning property should not deteriorate with time. For this reason, in the compression sole, a foam body such as EVA that is easily thermoformed is molded to obtain an upper bottom having a rising portion. However, the foam having a high cushioning property has a poor thermoformability, and there is a problem that wrinkles occur at the rising portion and the design to be given to the outer surface of the side surface of the upper bottom becomes unclear. On the other hand, in order to improve thermoformability, a foam having a low expansion ratio may be used, but a foam having a low expansion ratio has a problem that the cushioning property is low.

In order to solve such a problem, conventionally, when a foam made of a special material excellent in cushioning property and thermoformability is used as a material for the upper bottom, or when a foam such as EVA is molded. In addition, it has been necessary to devise such as cutting the foam before molding so that a desired shape and design can be imparted. However, the use of a foam made of a special material having both excellent cushioning properties and thermoformability has a problem of increasing the cost of raw materials, and a method of performing pretreatment such as cutting on the foam before molding has a problem. However, since the complicated work is required, the production efficiency is lowered, and the production cost is high.

The present invention has been made in view of the above problems.
It is an object of the present invention to provide an excellent shoe sole that can be manufactured at low cost and a method for manufacturing the same, without using a special material that raises the raw material cost or requiring a complicated manufacturing process.

[0006]

That is, a shoe sole according to the present invention comprises a core material and a coating material having a bottom surface portion that covers a bottom surface portion of the core material and a side surface portion that covers a side surface portion of the core material. A shoe sole comprising an upper sole integrally formed by heat and pressure molding and a lower sole adhered to a bottom portion of a covering material of the upper sole, wherein the core material and the covering material in the upper sole are cores. It is characterized in that the bottom surface portion and the side surface portion of the material are bonded and integrated via a heat seal adhesive layer.

Further, in the method for manufacturing a shoe sole of the present invention, the substantially flat core member and the substantially flat covering member are heat-pressed using a compression mold to heat the core member and the covering member. When manufacturing the upper bottom integrated through the seal adhesive layer, the core member is molded to form the core member having the bottom surface portion and the side surface portion, and the peripheral portion of the covering material member is formed into the core material. Start up along the side surface of the member for the side part,
Further, a covering material having a bottom surface portion and a side surface portion whose central portion is the bottom surface portion is formed, and the core material and the covering material are bonded and integrated at the bottom surface portion and the side surface portion of the core material via a heat seal adhesive layer. After the upper bottom is formed by forming the upper bottom, the lower bottom is attached to the coating material bottom surface side of the upper bottom. In the method of the present invention, the heat-seal adhesive layer may be a heat-sealable film sandwiched between the core member and the covering member. The heat-seal adhesive layer may be a heat-seal adhesive coating layer formed by applying a heat-seal adhesive solution or dispersion to the core material member and / or the covering material member.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the drawings.

1 and 2 show an embodiment of a shoe sole 1 of the present invention, in which 2 is a core material, 3 is a covering material, and the sole 1 of the present invention is shown.
Is an upper bottom 4 composed of a core material 2 and a covering material 3, and a lower bottom 5
Composed of and. The covering material 3 has a bottom surface portion 3 a for covering the bottom surface portion of the core material 2 and a side surface portion 3 b rising from the peripheral edge of the bottom surface portion 3 a, and the upper end edge of the side surface portion 3 b is higher than the peripheral edge of the core material 2. A protruding edge 6 that rises up is formed.
The protruding edge 6 may or may not be provided over the entire circumference of the core material 2. The core material 2 and the covering material 3 are bonded and integrated via a heat seal adhesive layer 7.

In the shoe sole of the present invention, as the material of the core material 3 constituting the upper sole 4, for example, a foam such as ethylene-vinyl acetate copolymer (EVA), polyurethane (PU), polyethylene (PE), or the like, , Wood materials such as cork, synthetic rubber, leather materials and the like. As the core material 3, a material that is generally excellent in cushioning property and does not deteriorate with time is used. However, since the degree of cushioning property differs depending on the purpose, the higher the cushioning property, the better. Instead, a foam material having a preferable material and a preferable expansion ratio according to the cushioning property to be applied to the shoe sole is selected and used. Further, the core material 3 does not need to be made of a single material, and for example, the heel side and the toe side of the core material 3 may be made of materials having different cushioning properties, and two or more different materials may be used. It may be configured by combining materials or materials having different expansion ratios.

On the other hand, the covering material 4 can also be constructed by using the same material as the core material 3, but generally a three-dimensional pattern is formed at an arbitrary portion of the side surface portion 3b including the protruding edge 6 of the covering material 4. An optional design 8 such as or a satin pattern is applied during thermoforming.
For this reason, it is preferable to use, as the covering material 4, a material that is more excellent in thermoformability than cushioning property and can surely express the intended design 8. As a material with excellent thermoformability,
For example, in the case of using a foam made of the same material as the foam forming the core material 3, a foam having a lower expansion ratio may be used.

As the heat-seal adhesive used to bond and integrate the core material 2 and the covering material 3 in the upper bottom 4, for example, polyethylene resin, thermoplastic polyurethane resin, polyester resin, polyamide resin, etc. And a material having suitable adhesiveness according to the materials of the core material 2 and the covering material 3 are selected and used. The upper bottom 4 is formed by bonding the core material 2 and the covering material 3 at the bottom surface portion and the side surface portion of the core material with a heat seal adhesive, but the bottom surface portion and the side surface portion are entirely bonded. You don't have to.

The lower bottom 5 is made of acrylonitrile-butadiene rubber (NBR), styrene-butadiene rubber (SB).
Rubber such as R), EVA, PU, polyvinyl chloride (PV
A material made of an elastomer such as C) is used. The upper bottom 4 and the lower bottom 5 are attached to each other with an adhesive (not shown). Examples of the adhesive for bonding the upper bottom 4 and the lower bottom 5 include urethane-based adhesives and synthetic rubber-based adhesives.

The shoe sole 1 of the present invention is manufactured by molding the upper sole molding laminate 9 shown in FIGS. 3 and 4 to manufacture the upper sole 4, and then bonding the lower sole 5 to the upper sole 4. can do. The upper bottom molding laminate 9 includes the heat-sealable film 70 including the core member 20 that forms the core 2 in the upper bottom 4 and the covering member 30 that forms the covering 3.
It is configured to be laminated via. When these are laminated, it is preferable to further use another adhesive to temporarily fix the core material member 20, the heat-sealable film 70, and the covering material member 30 so as not to shift from each other. As the heat-sealable film 70, the core member 20 is formed so that the protruding portion 70a protruding from the peripheral edge of the core member 20 is formed.
Use a larger one. Preferably, the protrusion 70
The protrusion length of a from the peripheral portion of the core member 20 is about the thickness of the core member 20. Further, the covering member 30 is cut into a larger size than the core member 20 and the heat-sealable film, that is, the protruding edge 6 is formed in a good size. The laminated body 9 is
The core member 20 and the covering member 30 are adhered to each other on the surface where the core member 20, the heat-sealable film 70, and the covering member 30 overlap each other. The material member 30 may not be adhered on the entire surface, and may be adhered in a dot shape. Further, the core member 20 and the covering member 30 may be adhered by a heat-sealable film or by using another adhesive.

The upper bottom molding laminate 9 has a surface temperature of 12
After heating to soften it to about 0 to 130 ° C,
As shown in FIG. 5, compression molds 10a, 1
0b at 150 to 160 ° C. for about 10 to 15 minutes and press-molding to form the core member 20 into a predetermined core 2 having a bottom surface portion and side surface portions, and a covering material member. A portion of the core member 30 protruding from the peripheral edge of the core member 20 is raised to form a coating material having a bottom surface portion and a side surface portion, and the core material 2 and the coating material 3 are bonded and integrated at the bottom surface portion and the side surface portion. Can be obtained to obtain the upper bottom 4. Since the core material member 20 is usually made of foam, when the core material member 20 is compressed at the time of molding, the core material member 20 does not have air to be effectively discharged from the core material member 20. Diameter 3-5
It is preferable to provide a plurality of through holes 11 having a size of about mm. When the covering member 30 is made of foam,
It is preferable to form a plurality of similar through holes in the covering member 30.

In the above example, the core member 20 and the covering member 30 are laminated via the heat-sealable film 70 to form the upper bottom molding laminate 9, but the heat seal is used. The heat-seal adhesive solution or dispersion may be applied to the core member 20 and / or the covering member 30 instead of the elastic film 70 to form the heat-seal adhesive layer. In this case, since it is necessary to dry after applying the heat-seal adhesive, it is preferable to use the heat-sealable film 70 in terms of manufacturing efficiency of the upper bottom molding laminate 9.

The method of the present invention is not limited to the case where the shoe sole is produced by attaching the lower sole 5 to the upper sole 4 produced by using the upper sole molding laminate 9. For example, the covering material member 30, the heat-sealable film 70, and the core material member 20 are placed in this order on the compression molds 10a and 10b, and this is heated and pressure-molded to obtain the upper bottom 4 and the upper bottom 4 A method of attaching the lower bottom 5 to the bottom may be adopted. In addition, after forming a heat-seal adhesive coating layer on at least one of the covering material member 30 and the core material member 20, the covering material member 30 and the core material member 20 are sequentially formed on the compression molds 10a and 10b. Place and heat, press-mold and top bottom 4
It is also possible to adopt a method in which the lower bottom 5 is attached to the upper bottom 4. Among the above-mentioned methods, from the viewpoint of manufacturing efficiency when manufacturing the upper bottom 4, the upper bottom molding laminate 9 is manufactured in advance, and the laminate 9 is molded by the compression mold to obtain the upper bottom 4. The method is effective, and in particular, the upper bottom molding laminate 9 formed by laminating the core material member 20 and the covering material member 30 via the heat-sealable film 70 is molded to obtain the upper bottom 4. The method is effective in terms of improving manufacturing efficiency.

On the sole 1 obtained as described above, the garment 12
The shoes 13 are bonded and integrated by an adhesive agent or the like.
(FIG. 6) is obtained.

[0019]

As described above, in the shoe sole of the present invention, since the upper sole is composed of the core material and the covering material, the design imparted to the outer surface of the side surface of the upper sole is clear, and the core is Different materials can be used for the covering material and the covering material, and the core material is formed of a material having a cushioning property, and the covering material is formed of a material having excellent moldability, so that the cushioning property and the design property are simultaneously provided. It can be an excellent sole. Further, since the core material of the shoe sole of the present invention can be composed of two or more different materials, by using materials having different functions depending on the parts of the core material, the conventional shoe sole of this type can be obtained. It is also possible to add new functions that were not possible. Further, according to the manufacturing method of the present invention, an excellent shoe sole can be manufactured reliably and efficiently.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a shoe sole of the present invention.

FIG. 2 is a vertical sectional view taken along the line II-II in FIG.

FIG. 3 is a perspective view of an upper sole molding laminate used for manufacturing the shoe sole of the present invention.

4 is a vertical cross-sectional view taken along the line IV-IV in FIG.

FIG. 5 is a vertical cross-sectional view showing a state in which an upper bottom molding laminate is molded in a mold to form an upper bottom.

FIG. 6 is a perspective view of a shoe using the shoe sole of the present invention.

[Explanation of symbols]

1 shoe sole 2 core material 3 coating material 3a Cover material bottom part 3b Side part of coating material 4 upper bottom 5 Bottom bottom 7 Heat seal adhesive layer 10a, 10b compression mold 20 Core material 30 Cover material 70 Heat-sealable film

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Yukio Iwasaki             537 Akitsuma, Ura-cho, Ora-gun, Tochigi Prefecture F-term (reference) 4F050 AA01 BA38 BA55 HA53 HA56                       HA57 HA58 HA77 KA10 KA16                       LA01 NA54

Claims (4)

[Claims] 1. An upper bottom formed by integrally forming a core material and a coating material having a bottom surface portion that covers a bottom surface portion of the core material and a side surface portion that covers a side surface portion of the core material by heat and pressure molding. When,
A shoe sole comprising a lower sole adhered to a bottom portion of a covering material of an upper sole, wherein the core material and the covering material in the upper sole have a heat seal adhesive layer on the bottom surface portion and the side surface portion of the core material. A shoe sole characterized by being integrally bonded through. 2. A substantially flat core material member and a substantially flat coating material member are heat-press molded using a compression mold to integrate the core material and the coating material via a heat seal adhesive layer. When manufacturing the above-mentioned upper bottom, the core material is molded to form a core material having a bottom surface portion and side surface portions, and the peripheral edge portion of the covering material member is raised along the side surface of the core material member. To form a coating material having a bottom surface portion and a side surface portion having a central portion as a bottom surface portion, and a core material and a coating material, and a heat seal adhesive layer at the bottom surface portion and the side surface portion of the core material. A method for manufacturing a shoe sole, characterized in that the upper sole is formed by adhering and integrating with each other to form an upper sole, and then the lower sole is attached to the bottom surface side of the covering material of the upper sole. 3. The method for producing a shoe sole according to claim 2, wherein the heat-seal adhesive layer is a heat-sealable film sandwiched between the core member and the covering member. 4. The heat-seal adhesive layer is a heat-seal adhesive coating layer formed by applying a heat-seal adhesive solution or dispersion to a core material member and / or a covering material member. Manufacturing method of shoe sole.