JPH0965903A - Shoe formed by injection molding - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve production efficiency of a shoe by improving the cooling effect for the material of the shoe sole which is injection molded in a melting condition to solidify the sole more quickly while the adhesion of the sole and the instep is maintained and shortening the cycle time for forming the sole. SOLUTION: A heel pad 2 with cut parts 4 around the upper part of the heel is attached on the rear surface of the insole 8. The heel pad 2 is buried inside the outsole 1 by injection molding, and reinforcement parts 1a adhered with an instep 9 which are integral with the outsole 1 are formed in the cut parts 4. With the sole of such structure, deformation of the surface of the side of the heel is prevented, and the stability of the heel when putting on the shoe is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection-molded shoe having a heel core embedded in a shoe sole.

[0002]

2. Description of the Related Art Conventionally, as an injection-molded shoe in which a heel core is embedded in a shoe sole, a shoe sole member formed by integrally molding a heel core and a shank is disclosed in JP-A-7-67704. It is disclosed to insert into a mold and injection mold the shoe sole. However, since the outer circumference of the heel core of this shoe sole member is smaller than the sewn portion between the insole and the cover, the shoe sole molding gap between the heel core and the molding die is wide and injection molding is performed. Since the thickness of the sole of the shoe is thicker on the side of the heel, the heat of the sole material does not escape easily, and it takes a long time for the shoe-molded shoe sole to solidify in the heat-melted state, which decreases the productivity of the shoe. Was there. Also, in order to improve the productivity of shoes, if the injection-molded shoes are removed from the mold early after molding, the soles are not sufficiently cooled and solidified, and the side surfaces of the soles may be deformed due to residual heat. It was Further, since the bottom of the heel core of this shoe sole member has a shape smaller than that of the insole at the heel portion, the heel stability during wearing is poor, and in order to prevent this, a heel core wider than the insole is used. It is used, but the heel core hits the sewn part between the insole and the cover, and it shifts from the predetermined position, which causes inconvenience in the work of mounting the heel core, and the heel core is embedded and injection molded. The shoe sole has a thin wall thickness at the outer periphery of the upper part of the shoe sole, and since the sufficient adhesive area cannot be secured, the adhesive force with the sulcus is weakened, and the upper part of the shoe sole is worn when worn for a long time. There was a defect that cracks were generated in the outer peripheral portion.

[0003]

SUMMARY OF THE INVENTION The present invention enhances the cooling effect of an injection-molded sole material after molding while maintaining the adhesive force between the sole and the cover, and shortens the molding cycle time of the sole. The present invention aims to provide an injection-molded shoe which improves the production efficiency of shoes, prevents deformation of the surface of the molded shoe heel side portion, and further improves heel stability during wearing. .

[0004]

According to the present invention, a heel core 2 is attached to a lower surface of an insole 8 and the heel core 2 is embedded in a shoe sole 1.
A cut portion 4 is provided on an upper outer peripheral portion of the heel core 2, and the cut portion 4
The gist of the invention is an injection-molded shoe in which an adhesion reinforcing portion 1a is formed on the shoe sole 1 and the sill portion 9 integrated with the shoe sole 1.

[0005]

In the injection-molded shoe of the present invention, the heel core is covered with the last mold and is temporarily attached to the lower surface of the insole by a double-sided adhesive tape.
After forming the sole molding void with the bottom mold, side mold and last mold, the bottom material is injection molded and anchored at the cut part of the upper outer periphery of the heel core to form an integral part of the shoe sole and the hem. By forming the adhesive reinforcement portion, the adhesive force between the shoe sole and the stilt portion is maintained. Further, in the injection-molded shoe of the present invention, the lower outer peripheral portion has a wider heel core than the insole and can be embedded in the sole, so that the gap between the heel core and the side mold (sole molding void) is narrowed, The thickness of the heel side of the shoe sole to be molded is thin, allowing the heat of the sole material to escape easily, which causes the heel of the injection-molded sole to cool faster and solidify, shortening the molding cycle and making injection. The production efficiency of molded shoes is improved, and the injection-molded shoes are the last model due to the cooling effect of the sole material.
Surface deformation of the heel of the injection-molded shoe is prevented even when the mold is released from the mold. Further, since the bottom of the heel core embedded in the shoe sole is wider than that of the insole, stability of the heel during wearing is ensured.

In the heel core of the present invention, if a shank having a gradually thin shape is integrally molded from the upper part of the heel core to the non-step portion with the same material, an appropriate bending is imparted to the tip of the shank. . As a result, the load is distributed,
It is possible to realize a shoe which has a good burr of the shoe sole during walking, does not break the joint portion between the heel core and the shank, has excellent restoration property against bending stress and twist and shape retention, and has a good wearing feeling.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, FIG. 1 is a sectional view of the heel of an injection-molded shoe according to the present invention. 2 is a perspective view of the heel core embedded in the injection-molded shoe of the present invention, and FIG. 3 is a longitudinal sectional view taken along line XX in FIG.

The heel core 2 used in the injection-molded shoe of the present invention is such that the upper surface shape is along the sole shape, and the heel thickness is 1
If the through holes 5, 5 ... And the holes 6, 6 ... That are open on the upper surface side are formed as shown in FIG. 2, the heel core itself can be made lighter. The heel core 2 is provided with a cut portion 4 in which an upper outer peripheral portion is cut inward from a sewn portion 10 of a sill portion 9 composed of a midsole 8 and a cover 7, and a lower outer peripheral portion is provided from the sewn portion 10. The outer peripheral width on both sides is increased by about 3 mm. In the heel core 2 of the present invention, the shank 3 may be integrally formed of the same material such as synthetic resin. Shank 3
As shown in FIG. 3, the thickness of the root is about 3 mm to 5 mm, and the wall thickness is gradually reduced from the root portion to the stepless portion, and a plurality of vertical through holes 5, 5 ... If this is done, the injection-molded material will flow into it, and the adhesion with the shoe sole will be strengthened.

The heel core 1 of the present invention is temporarily attached to the insole 8 of the scabbard 7 suspended in the last mold with the double-sided adhesive tape 11, and the side mold, the bottom mold, and the last mold.
The bottom material is injection-molded in the shoe sole molding space that is clamped by the needle and anchored in the cut portion 4 of the heel core 2 and the through holes 5, 5 ..., and the cut portion 4 is integrated with the sole 1 An injection-molded shoe having a heel core 2 embedded in the shoe sole 1 is formed by forming an adhesive reinforcement portion 1a with the shoe sole 9.

[0010]

The present invention is configured as described above, and in the heel portion, the cut portion 4 is provided on the upper outer peripheral portion of the heel core 2, and the cut portion 4 is bonded to the shoe sole 9 integrated with the shoe sole. Since the reinforcing portion 1a is provided, the bonding area between the shoe sole 1 and the crepe portion 9 is secured, and the bottom material is filled in the cut portion 4 of the heel core 2, so that the shoe sole 1 and the crepe portion 9 In the injection-molded shoe in which the adhesion strength of the heel core 2 is embedded and the heel core 2 is embedded, the thickness of the heel side surface can be thinly formed by the heel core 2 having a wide lower outer peripheral portion, so that the heat of the bottom material can easily escape, The heel part can be cooled and solidified in a short time, and the molding time of the shoe sole can be shortened. Therefore, the injection-molded shoe having the heel core embedded therein of the present invention can improve the productivity of the shoe, and the injection-molded shoe can prevent the deformation of the surface of the heel side portion due to the cooling effect of the sole material. Further, in the injection-molded shoe of the present invention, the heel core 2 having a lower outer peripheral portion wider than the insole 8 is embedded in the shoe sole, so that the injection-molded shoe is stable at the heel portion and has good wearing feeling. can get.

[Brief description of drawings]

FIG. 1 is a sectional view of a heel portion of an injection-molded shoe of the present invention.

FIG. 2 is a perspective view of a heel core used in the injection-molded shoe of the present invention.

3 is a vertical sectional view taken along line XX of FIG.

[Explanation of symbols]

 1 Sole 1a Adhesive reinforcement part 2 Heel core 3 Shank 4 Cut part 5 Through hole 6 Open hole 7 Cover 8 Insole 9 Squat 10 Sewing part 11 Double-sided adhesive tape

Claims (1)

[Claims] 1. A heel core 2 is attached to the lower surface of an insole 8 and is embedded in the shoe sole 1, and a cut portion 4 is provided on the outer periphery of the upper portion of the heel core 2, and the shoe sole 1 is attached to the cut portion 4. An injection-molded shoe in which an adhesive reinforcement portion 1a is integrally formed with the armor portion 9 integral therewith.