JPH067202A - Method for molding shoes having sole provided with foamed mid sole - Google Patents

Abstract

PURPOSE:To provide shoes provided with the sole molded simply with low cost, having an excellent adhesive property between the mid sole and ground contacting sole and a solid layer having a proper thickness on the ground contacting surface. CONSTITUTION:A ground contacting sole molding material molded of solid unvulcanized rubber introduced into a ground contacting sole molding cavity 0 formed on the bottom surface with ruggedness 011 is pressed with a dummy last 02 to mold an unvulcanized ground contacting sole 1 having a rugged design 11 on the ground contacting surface. Next, the dummy last 02 is replaced by a last 03 hanging a shell 3. A mid sole molding material formed of a foaming unvulcanized rubber introduced into a mid sole molding cavity 0' formed on the lower surface of the last 03 is heated to mold a foamed vulcanized mid sole 2. The ground contacting sole 1 is vulcanized and united with the shell 3 through the mid sole 2 by a foaming pressure in the mid sole molding.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for molding a shoe having a shoe sole having a foamed midsole.

[0002]

2. Description of the Related Art Conventionally, a vulcanized rubber shoe sole plate having a flat surface, in which unevenness is formed on a grounding surface according to Japanese Patent Publication No. 63-17443,
The peripheral edge is held between the bottom mold and the side mold and stretched on the bottom mold, and then a foaming mid-sol molding material is placed in the mold cavity formed on the upper surface of the outer bottom plate. Introducing and molding the foam midsole integrally with the sole plate, and deforming the sole plate along the curved surface of the bottom mold surface by the injection pressure or foaming pressure at the time of introducing the midsole molding material. The molding method of is proposed.

However, in such a shoe sole molding method, the vulcanized rubber sole plate is forcibly stretched by the injection pressure or the foaming pressure during the molding of the foam midsole, so that it can follow the curved surface of the bottom mold. After midsole molding,
The vulcanized rubber sole plate shrinks in an attempt to return to its original shape, and the shoe sole is deformed along the line, and the mid sole and the vulcanized rubber sole plate are separated at the interface. See you mid
Before molding the vulcanized rubber shoe, the vulcanized rubber shoe sole plate is molded, set in a mold cavity, and after vulcanization, the vulcanized rubber shoe sole plate is sandwiched between the bottom mold and the side mold. The outer peripheral part of
The molding process was complicated and the cost was increased.

Further, according to Japanese Patent Publication No. 36-12590, for the purpose of molding an intermediate sole, the last and the side mold in which the armor is suspended are introduced into a shoe sole molding cavity constituted by a vertically movable bottom mold. The foamable unvulcanized rubber and the solid unvulcanized rubber for grounding bottom molding located on the lower surface of the shoe are raised to lower the sole molding cavity and reduce the shoe sole molding coverage. After integrally molding into the shoe, the bottom mold is lowered to expand the shoe sole molding cavity, the intermediate sole is foamed and vulcanized, and the grounding sole is vulcanized and integrated through the intermediate sole. A molding method has been proposed.

However, since the bottom mold is moved up and down during molding of the shoe sole, the bottom mold is moved in relation to the vulcanization of the shoe sole.
The vertical movement of the field must be performed strictly, a precise mode is required, and the mode is expensive and costly.

[0006]

DISCLOSURE OF THE INVENTION The present invention is a shoe having a shoe sole which is easy to mold, is low in cost, has excellent adhesiveness between a mid sole and a grounding sole, and has a solid layer having an appropriate thickness on the grounding surface. Is to provide.

[0007]

The present invention will be described below in detail with reference to the drawings showing an embodiment of the present invention. The present invention introduces a solid bottom unvulcanized cavity 0 introduced into a grounded bottom molding cavity 0 having an uneven surface 011 formed on its bottom surface. The grounding bottom molding material made of rubber is pressed by the dami last 02 to mold the unvulcanized grounding bottom 1 having the uneven design 11 on the grounding surface, and then the dami last 02
Replace the last 03 with the cover 3 and last 03
Midsole formed on the underside of the mold, the midsole made of the expandable unvulcanized rubber introduced into the cavity 0 '.
The molding material is heated to foam and vulcanize to form the midsole 2, and the grounding bottom 1 is vulcanized to the cover 3 through the midsole 2 by the foaming pressure at the midsole molding. It is an object of the invention to provide a method for molding a shoe having a shoe sole having a foamed midsole, which is characterized by being integrated.

In the present invention, the grounded bottom molding material is a synthetic rubber such as natural rubber, polyisoprene rubber, styrene-butadiene rubber, nitrile rubber or butadiene rubber, and a softening agent, a cross-linking agent, a cross-linking aid, an antioxidant, a filler, etc. The material to which the commonly used rubber compounding agent is added is kneaded and sheeted, and cut into a grounded bottom shape. And foaming mid-sole molding material 2
Is a synthetic rubber such as natural rubber, polyisoprene rubber, styrene-butadiene rubber, and butadiene rubber, as well as grounded bottom molding material, and a common rubber compounding agent such as softening agent, cross-linking agent, cross-linking aid, anti-aging agent, and filler. Further, a foaming agent is added, the dough is made into a sheet shape, and cut into a shoe sole shape or a pellet shape.

The grounded bottom molding thus prepared is first introduced into the grounded bottom molding cavity 0, and the dummy last 02 located on the upper surface thereof is lowered to pressurize the grounded bottom molding. The unvulcanized grounded bottom 1 is compression-molded along the unevenness 011 formed on the bottom surface of the grounded bottom molding cavity and has an uneven design 11 on the grounded surface.

After the grounding bottom 1 is molded in this manner, the dummy last 02 is separated from the grounding bottom molding cavity 0 in which the grounding bottom 1 is molded, and replaced with the last 03 in which the armor cover 3 is suspended. A midsole molding cavity 0'is formed on the lower surface. To introduce a midsole molding material into this cavity 0 ', if the midsole is a direct balun canize method, the dummy last 0 is used.
When 2 is separated from the grounding bottom molding cavity 0, a midsole molding material is introduced on the upper surface of the grounding bottom, and the last 03 in which the cover 3 is hung is positioned on the upper surface, and the midsole molding is performed. Cavity 0'may be formed, or
It is also possible to replace the last 03 in which the last 02 and the cover 3 are suspended, and inject the midsole molding material into the lower surface of the last by injection.

The mid-sole molding material thus introduced into the mid-sole molding cavity 0'is heated and fired. However, due to plasticization and adhesiveness in the initial stage of heating, the lower surface of the cover 3 is formed by foaming pressure. It is baked and adhered to the upper surface of the grounding bottom 1. In the drawing, 01 indicates a vertically movable bottom mold,
Reference numeral 04 denotes a side mold that can be opened and closed.

[0012]

Since the present invention is configured as described above, it is easy to mold, is low in cost, has a sufficient thickness on the ground surface, and is provided on the bottom surface of the ground bottom molding cavity 0. A lightweight shoe sole having a grounding sole 1 having a sharp unevenness design 11 that exactly follows the designed unevenness 011 design, and having a mid sole 2 foam-baked between the grounding bottom 1 and the covering 3 You can get the shoes you have. Further, various functions of the shoe sole can be imparted by mixing the grounded sole molding material with abrasion resistance, slip resistance and oil resistance.

[Brief description of drawings]

FIG. 1A is a cross-sectional view of essential parts showing a grounded bottom molding state. FIG. 3B is a cross-sectional view of essential parts showing a mid-sole molded state.

[Explanation of symbols]

0. Grounded bottom molding cavity 0 '. Midsole molding cavities 011 ... unevenness 02. Dummy last 03. Last 1. Grounding bottom 11 ... uneven design 2. Midsole

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location B29K 105: 24 B29L 31:50 4F

Claims (1)

[Claims] 1. A grounding bottom molding material, which is introduced into a grounding bottom molding cavity 0 having concave and convex portions 011 formed on the bottom surface and is molded from a solid unvulcanized rubber, is pressed by a dami last 02 to form a grounding surface. After molding the unvulcanized grounding bottom 1 having the concavo-convex design 11, the last 0 in which the dummy last 02 and the cover 3 are suspended
Replaced with 3, the midsole formed on the bottom of the last 03
By heating the midsole molding material formed of the foamable unvulcanized rubber introduced into the molding cavity 0 ', the foam is vulcanized to mold the midsole 2.
A method for molding a shoe having a sole provided with a foamed midsole, characterized in that the grounding sole 1 is vulcanized integrally with the covering 3 through the midsole 2 by the foaming pressure during the molding of the midsole. .