JPS61222402A - Shoe sole and its production - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an improvement in a shoe sole made of polyurethane and a method for manufacturing the same.

<Conventional Example and its Problems> In general, soles made of foamed polyurethane have advantages such as light weight, ease of molding, and abrasion resistance, and are widely used as soles of various shoes.

However, although shoe soles made only of foamed polyurethane have the above-mentioned effects, they tend to be slippery when walking, and are even more slippery on wet road surfaces, which poses a great danger.

A shoe sole disclosed in Japanese Utility Model Publication No. 59-25204 is used to prevent this slipperiness. This sole has rubber pieces formed in a specific shape on the heel and tread portions of the ground so as to protrude from the ground.

To form this shoe sole, small pieces of rubber are vulcanized in advance in a mold, placed precisely at specific positions in the sole mold, and then the main material of foamable polyurethane is injected. .

However, it is necessary to perform surface treatment after vulcanizing and molding the small rubber pieces, and it is also necessary to form four parts in the shoe sole mold to place the rubber pieces, and it is necessary to properly place the rubber pieces in the recesses. The manufacturing process is complicated due to the necessity of positioning, the cost of the sole mold is high, and the precision of the manufacturing equipment is required, so the formed shoe sole is expensive and not suitable for mass production. there were.

Moreover, since the locations where the rubber pieces are placed are specified, if the area where the rubber pieces are not placed comes into contact with the road surface due to unevenness of the road surface, the anti-slip property will be impaired, and the rubber pieces will protrude from the ground surface. As a result, the shoes have disadvantages such as poor stability and comfort when worn.

OBJECTS OF THE INVENTION The present invention has been proposed to solve the above-mentioned drawbacks, and has excellent slip resistance and comfort even in shoe soles made of foamed polyurethane, and also simplifies the production process and facilitates mass production. It is an object of the present invention to provide a shoe sole suitable for use in a shoe sole and a method for manufacturing a shoe sole.

Structure> The present invention provides a sole formed mainly of polyurethane foam, characterized in that a plurality of small pieces of rubber are dotted on the contact surface of the sole, and [
A shoe in which a polyol component and an isocyanate component are mixed and stirred by interspersing a plurality of small pieces of rubber in a part of the shoe sole mold that corresponds to the contact surface of the shoe sole, in a manufacturing method for a shoe sole made of foamed polyurethane as the main material. A method for manufacturing a shoe sole, which comprises injecting and foaming a main sole material into the sole mold.

<Example> Hereinafter, the present invention will be explained based on an example shown in the drawings.

Examples of the foamed polyurethane sole of the present invention include the first
As shown in FIGS. 2 and 2, a plurality of small rubber pieces (3) are scattered over the entire contact surface (2) of the sole (1).

The shape of this rubber piece (3) is a cube, a rectangular parallelepiped,
In addition, it is preferable that the shoe is formed into a three-dimensional shape having at least one plane, such as a cone, and arranged so that the plane is exposed on the ground contact surface (2) of the sole (1).

In addition, if the rubber pieces mentioned above are softer than the foamed polyurethane that is the main material of the sole, the contact surface will be softer and the cushioning properties will be better than that of a sole made only of foamed polyurethane, which will soften the impact on the foot. Moreover, compared to when the rubber pieces (3) are harder than foamed polyurethane, the foot does not feel uncomfortable when the rubber pieces (3) receive an impact, and the comfort is improved.

When forming the sole (1), a small piece of rubber (3) is used in advance.
The above-mentioned shape is formed into a small size by cutting or molding. Shoe sole (1) in shoe sole mold (4)
) Place the above rubber piece (3) on the part corresponding to the ground contact surface (2).
... will be distributed and deployed.

Next, the sole mold lid (5) is closed, and the sole main material prepared by mixing and stirring the polyol component and the isocyanate component is injected into the sole mold (4).

The main material of the sole injected into the shoe sole mold (0) is foamed and hardened by the reaction of the polyol component and the isocyanate component, forming the sole.

Effects> The shoe sole and method for manufacturing the same of the present invention have the following effects.

■ Foamed polyurethane is used as the main material for the sole, making it possible to take advantage of the sole's durability against abrasion and oil, heat retention, light weight, and ease of formation.

■ Since the small rubber pieces are dispersed and exposed over the entire contact surface of the sole, the small rubber pieces have an anti-slip effect. It is more effective than a shoe sole because it has anti-slip properties over the entire sole, and the above-mentioned effect is not impaired even when the road surface is uneven.

■ In addition, since the sole of the present invention does not have a structure in which the rubber pieces protrude, it provides good stability when the shoe is worn, and the polyurethane and the rubber pieces fuse together to soften the hardness of the polyurethane. It also improves comfort.

■ The manufacturing method of the present invention is carried out by distributing small rubber pieces formed in a shoe sole mold and injecting and foaming the main material of the sole into the shoe sole mold. It is economical because it is possible to use a conventionally used mold and there is no need to create a new mold.

■ The rubber pieces only need to be dispersed within the shoe sole mold;
There is no need for accurate positioning and high precision in the placement of the rubber pieces of the device.

Furthermore, in the conventional manufacturing process for shoe soles made only of polyurethane, only the step of distributing and distributing small rubber pieces is added, and accuracy is not required in the arrangement of the rubber pieces, so there are no problems in the manufacturing process. To easily and quickly manufacture shoe soles without any complications, and to be suitable for mass production. Therefore, a shoe sole with excellent performance can be provided at a low cost.

[Brief explanation of the drawing]

Figures 1.2 (a) and 2 (b) are a bottom view and a sectional view thereof showing an embodiment of a shoe sole according to the present invention, and Figure 3 is a longitudinal sectional view showing a state in which a small piece of rubber is placed in a shoe sole mold. It is. (1)... Sole, (2)... Ground contact surface, (3)... Rubber piece, (0... Shoe sole mold.

Claims (1)

[Scope of Claims] 1. A sole made of polyurethane foam as a main material, characterized in that a plurality of small rubber pieces are dotted on the contact surface of the sole. 2. The shoe sole according to claim 1, wherein the rubber piece is softer than the polyurethane that is the main material of the sole. 3. In the manufacturing method for shoe soles made mainly of foamed polyurethane, a plurality of small pieces of rubber are scattered in the part of the shoe sole mold that corresponds to the contact surface of the shoe sole, and the polyol component and isocyanate component are mixed and stirred. A method of manufacturing a shoe sole, which comprises injecting and foaming the main material of the sole into the sole mold.