JPH034A - Method of manufacturing injection-molded shoe incorporating cushion member - Google Patents

Abstract

PURPOSE:To give a function in an extremely simple manner by securing a cushion member to the lower surface of an insole of a California shell which is then covered with an injection molded resin material so as to form a sole. CONSTITUTION:A California shell 1 which is formed by sewing the lower peripheral edge of a sheel material 2 to the peripheral edge of an insole 3, can be made of sewingable materials such as fabric, synthetic resin leather, artificial leather, synthetic leather or the like. The California shell 1 is suspended in a last mold 4, and then a cushion member 5 is attached to the lower surface of the insole 3 by securing means 6. The last mold 4 is combined at its lower part with a side mold 41 and a bottom mold 42 so as to define a sole mold cavity 43 into which a resin material is injection-molded. The resin material is selected from a group of consisting of polyvinyl chloride resin, polyurethane resin and the like which can be injection-molded. In this case, if the synthetic resin material of the cushion member 5 incorporated in a sole 11 is compatible with the injection-molded material, the compatibility therebetween occurs upon injection-molding of the sole so that they are co-solved, and accordingly, they are bonded together, thereby it is possible to prevent interlayer separation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method of manufacturing a shoe by injection molding, in which a cushion body such as an air bag made of synthetic resin is built into the sole of the shoe.

[Conventional technology]

BACKGROUND ART In recent years, as tastes in sports have diversified, there has been a demand for footwear that has functions adapted to those sports. In strenuous sports, the impact when you touch the ground during exercise is transmitted to your body from your heels, etc.
There is a risk of physical injury. In addition, even when walking normally, with the spread of hard paved roads such as asphalt in recent years,
The hardness of the road creates an environment in which people are susceptible to similar shocks when their feet touch the ground while walking, which can also cause physical damage.

Recently, in order to solve these inconveniences, attempts have been made to incorporate an air bladder into the sole of the shoe and utilize its cushioning properties to alleviate the impact.

[Problem to be solved by the invention]

By the way, in the conventional method of manufacturing shoes using such a solution body, especially an air bag, the sole of the shoe is formed to have a recess for receiving the air bag, and the sole and the joint are formed. An air bag was placed in a recess in the sole of the shoe between the shoe and the shoe, and these were integrated with adhesive or the like. However, due to manufacturing errors, the air bladder and its recess are not necessarily manufactured in a perfect shape, and there are gaps between them. When the air bladder expands and contracts repeatedly, the adhesive that adheres it becomes fatigued and peels off between the eyebrows, which makes it impossible to expect the desired cushioning effect and reduces the durability of the shoe itself. did.

On the other hand, in order to avoid this, the inventors of the present invention attempted to place these air bags, for example, in a cavity for sole injection molding, and incorporate them into the sole together with the shoe at the time of injection. However, since the air bag is light, it easily moves due to the injection pressure of normal injection resin, making it difficult to incorporate it into a predetermined position where a cushioning effect is required.

The present invention has been made in view of the above points, and provides a method for manufacturing injection molded shoes in which a cushion body can be incorporated into the sole during molding of the shoe sole at an appropriate location where cushioning properties are required. It is something to do.

[Means to solve the problem]

The present invention is made by fixing a notion body made of a synthetic resin material to the lower surface of the midsole of a California lace that is suspended in a last mold, and then forming a shoe by combining a side mold and a bottom mold on the lower part of the California lace. A method for manufacturing injection molded shoes with a built-in cushion body, characterized by forming a sole molding cavity and injecting a resin material for injection molding into the molding cavity to mold the sole.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

The California thorn (1) applied in the present invention is the thorn material (2).
) The lower peripheral edge and the inner sole material (3) peripheral edge are sewn together. The lace material (2) and the sole material (3) can be made of any material that can be sewn, such as cloth, synthetic resin leather, leather, artificial leather, or synthetic leather.

This California trumpet (1) is suspended in the last mold (4), and cushions made of synthetic resin are placed on the bottom of the inner sole material (3) at necessary locations, such as the heel and tread for boat fishing. The body (5) is attached using fixing means (6) such as adhesive. The cushion body (5) may be an air bag (7) or a sponge body formed by sealing a sheet made of a resin material compatible with the injection molded resin material by heat fusion using a high-frequency welder, a heated mold board, etc. Applicable. Inside this air bag (7) is a sponge body (8) and a coil spring (8).
1) etc. may be included. The air bag (7) serving as the cushion body (5) may be formed by placing synthetic resin sheets vertically opposite each other and sealing the periphery, and also forming a plurality of sealed air chambers (9) by sealing. . Each room (9) has a sponge body (8) and a coil (
81) may be enclosed.

This cushion body (5) may be already attached to the necessary locations with fixing means (6) such as adhesive before the California lacewing (3) is suspended in the last mold (4).

The protrusion (10) is made to protrude in the vertical direction, and the protrusion (10) is made to protrude from the inner sole (3) of the lace (1) suspended in the last mold (4).
5) may be pierced and fixed. In this case, when the protrusion (10) is pierced into the air bag, the air inside is pushed out by the pressure at the time of injection and the air bag (7) is pushed out.
There is a risk that the sole (11) will be formed in a crushed shape, so in order to prevent this, the air bag (7)
Inside is a sponge body (8) and a coil (81) as described above in order to maintain the volume of this air bag (7) against the injection pressure.
It is a good idea to include it. If the sponge body (8) is made of a synthetic resin with open cells instead of closed cells, the sponge body (8) can allow air to flow in and out through its expansion and contraction.

In addition, when such a cushion body (5) is stuck into the protrusion (10), a fixing means (6
), the attachment of the cushion body (5) will be more complete and the cushion body (5) will stick to the protrusion (10), so that the protrusion (10) will be removed from the cushion body (5) such as an air bag.
) can prevent the air inside the cushion body (5) from escaping through the holes. In addition, if an injection molding method that does not require a high injection pressure, such as an injection molding method using polyurethane resin, the above-mentioned problems caused by the injection pressure can be eliminated. Seal the cushion body (5) using the above method.
By fixing it to the insole material (3) of 1), it is possible to prevent the cushion body (5) from accidentally shifting due to injection pressure.

A sole molding cavity (43) is formed by combining a side mold (41) and a bottom mold (42) at the bottom of the last mold (4) in which the laces (1) are hung, and the molding cavity (43) is filled with a sole molding cavity (43). As the injection resin material to be injected, polyvinyl chloride resin, polyurethane resin, and other #MEF materials that can be injection molded can be used. In this case, the sole (1
1) If the synthetic resin of the cushion body (5) to be built in is configured to be compatible with the injection resin, the compatibility will occur during the molding of the sole, and they will adhere to each other and the layers will be separated. Peeling can be further prevented.

The entire cushion body (5) may be further coated with an adhesive that can adhere to or be compatible with the injection resin material. Last mold the cushion body (5) (
Even in the case where the inner sole (3) is pierced by the protrusion (10) of 4), fixing means (6) such as adhesive or adhesive may be applied to the attachment point of the inner sole (3). This can prevent the cushion body (5) from coming off the projection (10). Furthermore, a mark (12) indicating the position of the inner sole (3) may be drawn by printing or other means at the location where the inner sole (3) is attached.

In that case, the mark (12) makes it possible to accurately attach the cushion body (5) to the inner sole (3).

A hole is left that passes through the protrusion of the last mold (4) through the cushion body (5), and this hole opens into the inside of the shank (1), so the cushion body (5) has an air bag or open air bubbles. When a sponge body is used, not only does it have a cushioning effect, but also the air inside it circulates through the holes as the cushion body (5) expands and contracts during exercise, and as a result, the air inside the spongy body (1) flows. Flow occurs, reducing humidity caused by sweat, improving comfort, and preventing foot diseases.

[Effects of the present invention]

As explained above, according to the present invention, a cushion body made of synthetic resin is fixed to the lower surface of the insole of a California shoe, and the cushion body is covered with an injection resin material to form the sole of the shoe. It is completely buried inside the bottom, and there is no gap between them, so they are firmly joined, and despite the repeated expansion and contraction of the cushion body, their joint remains in good condition. There is no reduction in the cushioning effect, and there is no risk of reducing the durability of the shoe.

Furthermore, according to the present invention, the cushion body can be built into the sole at the same time as the sole is formed at an appropriate position in the midsole, so that the cushioning function as expected can be achieved at the appropriate location of the shoe that requires a cushioning effect. It can be applied very easily.

[Brief explanation of the drawing]

FIGS. 1 and 2 are explanatory diagrams showing the manufacturing state of an embodiment of the present invention, respectively. FIG. 3 is a perspective view of an embodiment of a cushion body applied to the present invention, and a view seen from FIG. 4. It is. DESCRIPTION OF SYMBOLS 1...California bamboo shoot, 2...Lumber, 3...Middle sole material, 4...Last mold, 41...Side mold, 42...Bottom mold, 43...Molding void, 5 ... Kunjeong body, 6... Fixing means, 10...
・Acicular process, 11...sole

Claims (1)

[Claims] (1) A cushion body made of synthetic resin is fixed to the lower surface of the inner sole of the California lace that is suspended in the last mold, and a side mold and a bottom mold are combined at the bottom of the California lace to form a sole molding space. 1. A method for manufacturing injection molded shoes with a built-in cushion body, characterized in that the sole is formed by injecting a resin material for injection molding into the molding gap.