JPH05154002A - Method of manufacturing injection molded shoes - Google Patents

Abstract

PURPOSE:To provide a method of manufacturing injection molded shoes, which method neither require preformed cushion material nor troublesome handwork of attaching cushion material to a recess formed in the bottom of the last mold or inside of the shoes sole and which method enables efficient injection molding of shoes with a definite quality. CONSTITUTION:A first cushion part 14 having at least one recess part 15 for air containment on the bottom of the cover 12 is injection molded. After of along with molding the first cushion part 14, a second cushion part 16 having a recess part 17 for air containment located opposite to the recess 15 for air containment is injection molded. Subsequently, the first and the second cushion part 14 and 16 are brought into close contact with each other to form a air containment 19 comprising two recesses 15, 17 inside of the two cushion parts 14, 16. Later, the shoes sole is formed by at least one injection.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of manufacturing an injection-molded shoe, and more particularly to a method of manufacturing an injection-molded shoe in which a cushion air reservoir is injection-molded in the shoe sole when molding the shoe sole.

[0002]

2. Description of the Related Art In recent years, in order to reduce the weight of shoes, improve their functionality, and improve their comfort, it has been possible to bury a cushion material made of a preformed airbag or a foam material in the sole of the shoe. Has been done.

[0003]

However, when the cushion material is embedded in the shoe sole, the cushion material is manually attached to the bottom portion of the last mold or is formed inside the shoe sole as in the prior art. When a cushion material is mounted in the recess, it is difficult to obtain a product of constant quality due to individual differences and variations in mounting. Further, not only the productivity is lowered due to the increase in the number of steps by manual work, but also the manufacturing cost is increased because the cushion material formed separately is used.

The present invention has been made to overcome the above-mentioned conventional problems, and its purpose is not only to eliminate the need for preformed cushioning materials, but also to provide the bottom of the last mold or shoes. To provide a method for manufacturing an injection-molded shoe that does not require troublesome manual work such as mounting a cushion material in a recess formed in the bottom and can efficiently injection-mold a shoe of a certain quality. is there.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a first cushion portion having at least one air reservoir forming recess is injection-molded at the bottom of a cover, and after or simultaneously with the molding of the first cushion portion. A second cushion portion having an air reservoir forming recess facing the air reservoir forming recess is injection molded, and then the first and second cushion portions are brought into close contact with each other to form the two air reservoirs in these two cushion portions. (EN) A method for manufacturing an injection-molded shoe, which comprises forming an air reservoir composed of a recess for use and then forming the shoe sole by at least one injection.

[0006]

As described above, the first cushion portion having at least one air reservoir forming recess in the bottom of the cover is injection-molded, and the air cushion forming recess is formed in the air reservoir forming recess after or simultaneously with the molding of the first cushion portion. A second cushion portion having a confronting air reservoir forming recess is injection molded, and then the first and second cushion portions are brought into close contact with each other to form an air reservoir composed of the two air reservoir forming recesses in these two cushion portions. By forming and then forming the shoe sole by at least one injection, not only the preformed cushioning material is not required but also the bottom of the last mold or the recess formed inside the shoe sole. No troublesome manual work such as attaching a cushion material to the shoe is required, and shoes of constant quality can be efficiently injection-molded.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. In this embodiment, the case where the second cushion portion is formed after the formation of the first cushion portion is taken as an example.

As shown in FIG. 1 and FIG. 2, a first cushion part is formed by combining a last mold 30, a side mold 40, a dummy mold 50 and a bottom mold 60 in which a cover 12 having an insole 11 is suspended. Void 70
And second cushion portion forming void 80 and outsole forming void 9
Configure 0.

The dummy mold 50 has three so-called kamaboko-shaped convex portions 52 having a semicircular cross section on the upper surface of the portion 51 corresponding to the heel portion 13 of the insole 11. These 3
The individual convex portions 52 are arranged side by side so as to maintain an equal interval and face the lateral direction of the dummy mold 50.
Further, the same number of convex portions 53 are provided on the lower surface so as to face the above-described three convex portions 52. Therefore, when the synthetic resin is injected into the first cushion portion forming gap 70 and the second cushion portion forming gap 80, the three air reservoir forming recesses 1 are formed on the lower surface of the first cushion portion 14.
5 is formed, and an air reservoir forming recess 17 facing the air reservoir forming recess 15 of the first cushion portion 14 is formed on the upper surface of the second cushion portion 16 (see FIG. 3).

In the above-described state, the opaque vinyl chloride resin composition injection molding material is filled from the side mold 40 side into the first cushion part molding space 70 to integrate the first cushion part 14 with the cover 12. To mold. On the lower surface of the opaque first cushion portion 14 thus molded,
As described above, the three air reservoir forming recesses 15 are formed.

Next, as shown in FIG. 3, an injection molding material composed of a transparent vinyl chloride resin composition is filled from the bottom mold 60 side into the void 80 for molding the second cushion portion, and the transparent second cushion portion 16 is filled. To form. On the upper surface of the second cushion portion 16 formed in this way, three air reservoir forming recesses 17 that are opposed to the air reservoir forming recesses 15 of the first cushion portion 14 described above are formed.

Then, as shown in FIG. 4, an injection molding material made of an opaque vinyl chloride resin composition is injected from the bottom mold 60 side into the bottom molding cavity 90 to form the bottom portion 18.

Then, as shown in FIG. 5, the dummy mold 50 is removed and the bottom mold 60 is pushed up to bring the opaque first cushion portion 14 and the transparent second cushion portion 16 into close contact with each other. 14,
Three air reservoirs 19 each including an air reservoir forming recess 15 in the upper half portion and an air reservoir forming recess 17 in the lower half portion are automatically formed in the inside of 16 without requiring manpower. At that time, the air reservoir 1
Air is taken into 9 and sealed.

Next, as shown in FIG. 6, it is surrounded by a last mold 30 in which the cover 12 is suspended, a side mold 40, a bottom mold 60, a cushion portion 21 composed of two cushion portions 14 and 16, and a main bottom portion 18. The side mold 4 is provided with an injection molding material composed of an opaque vinyl chloride resin composition in the void 100 for forming the midsole portion.
The midsole part 20 which is injected and filled from the 0 side and becomes the sole of the shoe
To form.

Then, after lowering the bottom mold 60, the side mold 40 is separated and the last mold 30 is taken out from the molded shoe taken out. As shown in FIG. A shoe 10 having is obtained. In the shoe 10, the air reservoir 19 can be seen through from the transparent second cushion portion 16 side.

Although the embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and modifications and the like within the scope not departing from the gist thereof are included in the present invention. Is.

That is, it is preferable that the air reservoir 19 is provided not only in the heel portion 13 but also in the portion from the heel portion to the arch portion such as a portion requiring particularly cushioning property.

The sectional shape of the air reservoir 19 may be circular as in this embodiment, but may be any other shape such as an ellipse, a square, a hexagon, or an equilateral triangle that can be divided into upper and lower parts.

Further, the first and second cushion portions 14, 1
6, materials such as the bottom portion 18 and the midsole portion 20 are not only vinyl chloride resin compositions but also other synthetic resins such as polyurethane, polyamide resin compositions, polyester resin compositions, styrene-butadiene rubber, styrene. -The thermoplastic rubber such as isoprene rubber and the one having flexibility when formed into a molded body may be formed.

Further, in this embodiment, the case where the second cushion portion 16 is injection-molded after the first cushion portion 14 is injection-molded has been described, but the first cushion portion 14 and the second cushion portion 16 are simultaneously injection-molded. By doing so, the molding time can be further shortened.

Further, in order to adjust the elasticity of the air reservoir 19, as shown in FIG.
You may form the pillar 24 which consists of 2, 23.

[0022]

As described above, according to the present invention, the first cushion portion having at least one air reservoir forming recess in the bottom of the cover is injection-molded, and the first cushion portion is molded or molded. At the same time, a second cushion part having an air reservoir forming recess facing the air reservoir forming recess is injection molded, and then the first and second cushion parts are brought into close contact with each other so that the two air reservoirs are accommodated in these two cushion parts. Since the shoe bottom is formed by at least one injection after forming the air reservoir composed of the forming recess, not only the cushion material formed in advance is not required, but also the bottom of the last mold, or Eliminates the need for troublesome manual work such as mounting a cushion material in the recess formed inside the shoe sole, and enables efficient injection molding of shoes of a certain quality. Was Tsu.

[Brief description of drawings]

FIG. 1 is a flow chart for manufacturing an injection-molded shoe by the method of the present invention.
It is explanatory drawing which shows the following injection process.

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

FIG. 3 is a second view of manufacturing an injection-molded shoe by the method of the present invention.
It is explanatory drawing which shows the following injection process.

FIG. 4 is a view of manufacturing an injection-molded shoe by the method of the present invention.
It is explanatory drawing which shows the following injection process.

FIG. 5 is an explanatory view showing a step of removing the dummy mold and bringing the first cushion portion and the second cushion portion into close contact with each other.

FIG. 6 is a view of manufacturing an injection-molded shoe by the method of the present invention.
It is explanatory drawing which shows the following injection process.

FIG. 7 is a sectional view of a shoe injection-molded by the method of the present invention.

FIG. 8 is an explanatory diagram showing another example of an air reservoir.

[Explanation of symbols]

 12 Cover 14 First Cushion Part 15 Air Reservoir Forming Recess 16 Second Cushion Part 17 Air Reservoir Forming Recess 19 Air Reservoir 20 Sole

Claims (2)

[Claims] 1. A first cushion part having at least one air reservoir forming recess at the bottom of a cover is injection molded, and faces the air reservoir forming recess after or simultaneously with the molding of the first cushion part. Injection molding a second cushion portion having an air reservoir forming recess, and then closely contacting the first and second cushion portions to form an air reservoir composed of the two air reservoir forming recesses in these two cushion portions. Then
After that, the method for producing an injection-molded shoe, characterized in that the shoe sole is formed by at least one injection. 2. The method for manufacturing an injection-molded shoe according to claim 1, wherein the second cushion portion is injection-molded from a transparent synthetic resin.