JPH0798002B2 - Molding method for high quality soles - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for molding a multi-quality shoe sole.

(Prior Art) Conventionally, an insert piece that is different from the sole body that is cut and formed according to the volume of the insert molding chamber by using a mold in which a partition wall is formed on the bottom by a partition wall according to Japanese Utility Model Publication No. 33-6084. Then, after introducing the shoe sole body molding material into the mold cavity and heating and pressing it, the shoe sole body is molded, and a foreign insert piece is insert-molded on the grounding surface of the shoe sole body. A method for forming a multi-quality sole has been proposed. With this method,
Prevents the insert piece from flowing out of the insert molding material or the sole body molding material from flowing into the insert chamber during insert molding, so that the shoe with a clearly defined boundary between the insert piece and the sole body should be used. It can be molded.

However, when the insert piece is thick, on the ground plane of the insert piece, it is not possible to clearly shape the design engraved on the bottom surface of the insert chamber, and when the insert piece is thin, When the shoe sole body is molded, the shoe sole body molding material flows into the compartment, causing turbulent flow in the compartment, causing the insert piece to rise, and the shoe sole body molding material protruding to the grounding surface side of the insert piece, resulting in a remarkable appearance. There was a drawback that lowered it.

(Problems to be Solved by the Invention) The present invention eliminates these drawbacks, forms a clear design on the ground contact surface side at the time of insert molding, and has a clear partition between the insert piece and the sole body. It seeks to provide a high quality sole in a simple manner.

(Means for Solving the Problems) As described above with reference to the drawings showing the embodiment of the present invention, the insert molding chamber 11 having the concave and convex design 110 formed on the bottom surface thereof
At the same time, set the insert piece a which is thinner than the depth of the insert molding chamber 11 and is molded corresponding to the shape of the insert molding chamber 11, and further corresponds to the shape of the insert molding chamber 11 on the upper surface of the insert piece a. After the insert auxiliary piece b formed of the shoe sole body molding material is set to substantially the same height as the partition wall 111, a shoe sole body molding material c different from the insert piece a is introduced into the mold cavity 1, The subject matter of the present invention is a molding method for a multi-quality shoe sole, characterized in that the shoe sole body 4 is pressure-molded and the insert piece a is insert-molded on the ground contact surface of the shoe sole body 4. In the insert molding chamber 11 of the present invention, if the insert piece a to be molded imparts slip resistance and wear resistance to the sole,
As long as the stepped portion and the heel portion of the mold cavity 1 are provided with flexibility to the formed shoe sole, the ball portion of the mold cavity 1 is provided with elasticity to the formed shoe sole. For example, it is formed by projecting the partition walls 111 into the mold cavity 1 at the non-step portion, respectively. However, depending on the purpose of the insert molding of the insert piece a, the mold cavity 1 may be formed at an appropriate position. Can be formed. Insert molding room
The depth of 11, that is, the height of the partition wall 111 from the bottom surface of the mold cavity 1 is 1.5 m depending on the wall thickness of the shoe sole to be molded.
It is preferably designed to be m to 5.0 mm. If the depth is less than that, the insert piece a is inserted into the insert molding chamber as the sole body molding material c flows under pressure when molding the sole body.
There is a tendency that the insert piece a flows out from 11 and the insert piece a cannot be insert-molded at a specified place, and if the depth is more than that, the partition wall 111 bites too deeply into the shoe sole body 4 when the shoe sole body is molded, As a result, a deep groove is formed in the ground contact surface of the shoe sole body 4, and the tear strength of the shoe sole may be significantly reduced. The bottom surface of the insert molding chamber 11 is provided with an appropriate concave and convex design 110 such as letters and figures.

In the present invention, the insert piece a is made of natural rubber, synthetic rubber, vinyl chloride, EVA or the like, and has slip resistance, abrasion resistance, flexibility,
The insert molding chamber 11 is formed to have different physical properties such as elasticity and hardness from the molding material for the sole of the shoe sole in terms of material or color, and is thin-walled, preferably 1.0 mm to 3.0 mm thick.
It is cut and formed according to the shape.

If the thickness of the insert piece a is less than that, when the design a'corresponding to the concave-convex design 110 is formed by pressure on the ground surface of the insert piece a during insert molding, the insert auxiliary piece is attached to the ground surface. If b is exposed, the appearance may be deteriorated, and if the thickness of the insert piece a is larger than that, a design a ′ corresponding to the uneven design 110 cannot be clearly formed on the grounding surface of the insert piece a. I have a hate.

In the present invention, the insert assisting piece b is formed in the same material or color as the shoe sole body forming material c, and has a material thickness sufficient to fill the difference in depth between the insert piece a and the insert chamber 11. Then, it is cut and formed according to the shape of the insert molding chamber 11.

In the present invention, the insert piece a and the insert auxiliary piece b may be cut and formed separately, but the insert piece molding material and the auxiliary piece molding material are laminated and formed in advance, and this laminate is cut and formed at the same time. This is convenient because the setting in the insert molding chamber 11 can be performed at the same time.

In the present invention, the shoe sole body molding material c is made of natural rubber, synthetic rubber, vinyl chloride, EVA or the like which is usually used for molding shoe soles. In the present invention, the insert piece a and the insert auxiliary piece b are set in the insert molding chamber 11, and then the shoe sole body molding material c is introduced into the mold cavity 1 by means such as setting, injection, casting or the like, and this is added. The shoe bottom body 4 is pressed and heated as needed to mold the shoe sole body 4, and the insert piece a is insert-molded on the ground surface of the shoe sole body 4 via the insert auxiliary piece b.

(Advantageous Effects of the Invention) Since the present invention is configured as described above, the insert chamber 11 is preliminarily provided with the insert piece a prior to insert molding.
Since it can be filled with the insert auxiliary piece b and the shoe sole body, the shoe sole body molding material c does not flow into the bottom surface of insert molding or the insert piece a flows into the shoe sole body molding cavity during molding of the shoe sole body. Since it is blocked by the insert auxiliary piece b which is of the same quality as the shoe sole body molding material c, it is possible to obtain a shoe sole in which the insert piece a and the shoe sole body 4 are clearly defined on the ground contact surface. Further, since the insert piece a is thin with respect to the depth of the compartment 11, the design a'corresponding to the concave-convex design 110 engraved on the bottom surface of the insert molding chamber 11 by the pressure applied when molding the sole body. Can be shaped clearly.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing an embodiment of the present invention. FIG. 2 is a sectional view of an essential part of a shoe sole formed according to the present invention. Explanation of the reference 1 ... Mold cavity, 11 ... Insert molding chamber 110 ... Concavo-convex design, 111 ... Partition wall 2 ... Lower mold, 3 ... Upper mold 4 ... Sole, a ... Insert piece a ' …… Design, b …… Auxiliary insert piece c …… Shoe bottom body molding material

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Claims (1)

[Claims] 1. An insert piece a, which is thinner than the depth of the insert molding chamber 11 and has a shape corresponding to the shape of the insert molding chamber 11, is set in the insert molding chamber 11 having a concave and convex design 110 engraved on the bottom surface. After the insert auxiliary piece b formed of the shoe sole body molding material corresponding to the shape of the insert molding chamber 11 is set on the upper surface of the insert piece a at almost the same height as the partition wall 111, the insert is inserted into the mold cavity 1. A multi-purpose shoe characterized by introducing a shoe sole body molding material c which is different from the piece a into the shoe sole body 4 under pressure to form the insert piece a on the ground contact surface of the shoe sole body 4. Bottom molding method.