JPH0857985A - Manufacture of injection molded shoe - Google Patents

Abstract

PURPOSE: To manufacture an injection molded shoe which has high commodity value by removing foamed urethane for a bottom adhered to the surface of a partial bottom when a shoe bottom is molded by using the partial bottom of different color and/or different material. CONSTITUTION: Cloth 5 coated with polyurethane hot-melt paste is temporarily adhered to the surface of a partial bottom 2 by anti-slip rubber 4 by heat press bonding. The bottom 2 is placed on a sole mold, the foamed urethane to become a main bottom is injected, the foamed urethane adhered to the bottom 2 submerged between the bottom 2 and the cloth 5 is removed by peeling the cloth 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to removing a material of an outsole different from a partial sole from entering and adhering to a partial sole having a different color and / or a different type when molding an injection-molded shoe.

[0002]

2. Description of the Related Art Urethane foam soles are widely used in injection-molded shoes because of their light weight and excellent abrasion resistance.
However, it has a smooth surface like marble wet with rain,
Alternatively, it has a drawback that it is slippery on the hardened snow. For the purpose of covering the drawback, it is often the case that the shoe sole is formed by using a material for the partial sole which is different in color and / or different from the resin for the outsole. At this time, the different-colored and / or different-shaped partial bottom is injection-molded first, and then the main bottom is injection-molded, or the different-colored and / or different-shaped partial bottom is molded in a separate step, and the partial-bottom is There is a method in which the sole is placed on the upper surface and the outsole is injection-molded. At that time, the bottom part of the material of the outsole first injected,
Alternatively, they may flow into the bottom of a part that is molded in a separate step and placed on the upper surface of the sole mold, and may be mixed.

In order to prevent this, as shown in FIGS. 4 and 5, the sole mold is provided with a protruding wall usually called a bank.
The protruding wall is provided with the same shape as the outer shape of the partial bottom, and a different color and / or a different material from the resin of the outsole is injected into the protruding wall to form the partial bottom, or A partial bottom formed of a different color and / or a different material from the resin of the outsole formed in a separate step is inserted and placed, and the outsole is injection-molded. By providing the sole mold with the protruding wall, the inflow of the outsole material into the partial bottom and the movement of the partial bottom are prevented.

[0004]

There are various possible purposes of using the partial sole for the heel and the foot of the shoe sole. Usually, vinyl chloride, which has good moldability, and urethane foam, which emphasizes lightweight, are used. In addition, color materials with rich coloring are often used with visualization.

These partial bottoms are usually made of a material different from that of the main bottom and are formed in a flat shape. The planar bottom molded partial bottom is inserted and placed in the recess surrounded by the projecting wall of the molding sole mold, and the urethane foam bottom material is injected. When the depression on the upper surface of the sole mold is flat, a gauge is formed on the projection surface to manufacture a blade die and the partial bottom is cut. Therefore, it is possible to cut the partial bottom without a gap with respect to the depression. However, since the upper surface of the sole mold is processed into a concave curved surface in both the vertical and horizontal directions, it is difficult to cut the partial bottom with the blade mold as described above. Therefore, when the flat-molded partial bottom is inserted and placed in the recess, a small gap is formed between the upper surface of the sole mold and the protruding wall. In addition, the partial bottom has an uneven design.

When the main bottom material is injected in this state, it is often the case that the resin of the main bottom material penetrates into the void through the gap and into the concave portion of the design. In order to prevent diving there, the bottom of the design where the bottom of the dissimilar material is in contact with the protruding wall is eliminated (A)
Make a bank (6) (see the left half of FIG. 2 and (a) of FIG. 3). Further, the urethane foam for the bottom that has sunk into the bottom is removed one by one using a tool such as a nipper (B), or is buffed with a rotating brush such as a cloth brush or a plastic brush (C). In the method of (A), the bank (6) must be provided around the bottom of the part, and it is not possible to cut from the sheet having the continuous design, and it is necessary to individually mold the sheet, and the molding cost is too high. There are drawbacks. Furthermore, making the bank (6) is unfavorable in design and the appearance is not good. Since the method (B) is performed manually, it takes time and labor, and the workability is poor, which causes a cost increase. The method of (C) needs to be corrected because it may scrape off not only the resin for the submerged bottom but also the design of the surface of the partial bottom (B)
The same factors as in the above method occur. The present invention has been made to solve these problems.

[0007]

[Means for Solving the Problem] In molding a sole of a foamed resin, a different sole and / or a different sole is formed by using a material for a partial sole which is different from and / or different from the resin of the outsole. In this case, a method for producing an injection-molded shoe is provided, in which an anti-slip rubber is used for a partial bottom, and a fabric in which a polyurethane hot melt adhesive is applied to the surface of the anti-slip rubber is temporarily thermocompression-bonded. .

[0008]

[Function] Since the cloth coated with polyurethane hot melt glue on the surface of the anti-slip rubber is thermocompression-bonded, when removing the foaming resin for the outsole that has sunk into the partial bottom, remove the cloth at a stretch. The foaming resin for the outsole that has sunk into the fabric comes off.

[0009]

An embodiment of the present invention will be described with reference to the drawings. First, the anti-slip rubber (4) which becomes the partial bottom (2) of a different material is molded. The manufacturing method of the anti-slip rubber (4) is fair 2
As described in Japanese Patent Publication No. 35202, it is made by mixing short fibers of glass into rubber. The anti-slip rubber (4) of this example was first pressed to obtain a thickness of 6 mm and a thickness of 500 mm × 500.
A sheet of anti-slip rubber (4) with a continuous design having a size of mm is formed, and a thin cotton cloth (5) is attached to the design surface (7) serving as a ground contact surface. The cloth (5) is made of urethane-based hot melt paste (Chris Bon AH
420 ... A fabric having a product name) applied to the back surface. The cloth (5) is heated at a temperature of 150 ° C. and a pressure of 2.5 kg / cm ^2.
Temporarily attach by thermocompression bonding for 3 seconds.

In this way, a sheet of anti-slip rubber (4) with a continuous design in which the cloth (5) is temporarily attached is produced, and this is cut to produce the partial bottom (2). The partial bottom (2) is inserted and placed in the recess (13) surrounded by the projecting wall (12) formed on the upper surface (11) of the sole mold (10) to form the main bottom (1). Is injected to mold the sole (3). At that time, since there is a slight gap between the protruding wall (12) and the partial bottom (2), the urethane foam which becomes the liquid bottom (1) invades (8), and the anti-slip rubber (4) ) Is provided with an uneven design, and even if the fabric (5) is temporarily attached to the design surface (7), it is between the concave (9) of the design and the temporarily attached fabric (5). Has a gap, and urethane foam enters (8) from this gap (see (c) of FIG. 7). The present invention removes this invaded (8) urethane foam. When removing the invaded urethane foam (8) after completion of molding, the cloth (5) is peeled off at once and the invaded urethane foam (8) becomes the cloth (5). Removed together while sticking to. (See (d) in FIG. 7)

[0011]

[Effect] Since the cloth coated with polyurethane hot melt glue on the surface of the anti-slip rubber is thermocompression-bonded, when removing the urethane foam for the outsole that has sunk into the partial bottom,
When the cloth is peeled off at once, the urethane foam for the outsole that has sunk into the cloth comes off the cloth. Therefore, it is not necessary to make a bank around the part bottom of the dissimilar material in contact with the protruding wall so as not to prevent the submersion, or to remove the urethane foam for the bottom that has submerged one by one using a tool such as a nipper. Alternatively, it is not necessary to buff with a rotating brush such as a cloth brush or a plastic brush. For these reasons, the appearance of the design is not impaired, the productivity is improved and the product value is improved, and there is also an effect of increasing the economic effect and motivation of consumers to purchase.

[Brief description of drawings]

FIG. 1 is a diagram in which a fabric is temporarily attached to a design surface of a partial bottom.

FIG. 2 is a partial plan view of a shoe sole (right half) formed by the present invention and a partial bottom view of a shoe sole (left half) provided with a bank by a conventional technique.

FIG. 3 (a) is an enlarged view taken along the arrow A in FIG. (B) An enlarged view of the arrow B of FIG.

FIG. 4 is a partial plan view of a sole mold.

FIG. 5 is a view taken in the direction of arrows C to C in FIG. 4 (two-dot chain line indicates a mold set at the time of molding the shoe sole).

FIG. 6 is a view showing a state in which a fabric is temporarily attached to a design surface of a partial sole of a shoe sole formed according to the present invention.

7 (c) is an enlarged view of a portion D of FIG. 6, in which resin of the outsole has intruded between the design surface of the partial bottom and the fabric. (D) An enlarged view of the D portion of FIG. 6, in which the resin of the outsole that has entered between the design surface of the partial bottom and the cloth is removed by peeling the cloth.

[Explanation of symbols]

 1 bottom 2 partial bottom 3 shoe sole 4 anti-slip rubber 5 cloth 6 embankment 7 design surface 8 entry 9 concave 10 sole mold 11 upper surface 12 protruding wall 13 depression

Claims (1)

[Claims] 1. In molding a shoe sole of a foamed resin, a different sole and / or a different sole (() is used by using a material of a partial sole (2) different and / or different from the resin of the outsole (1). When molding 3), an anti-slip rubber (4) is used for the partial bottom (2), and a cloth (5) having a surface of the anti-slip rubber (4) coated with a polyurethane-based hot melt adhesive is temporarily thermocompression-bonded. A method of manufacturing injection-molded shoes, which is characterized in that