JPH0638763B2 - Multicolor shoe sole injection mold - Google Patents

Description

The present invention relates to a multicolor shoe sole injection molding die.

(Prior Art) Conventionally, according to Japanese Patent Laid-Open No. 62-84703, a bottom shoe mold, a side mold and a last mold constitute a primary shoe sole molding cavity and a secondary shoe sole molding cavity, and furthermore, a primary shoe sole molding. The runner and the secondary shoe sole forming runner are run along the mating surfaces of the bottom mold and the side mold, respectively, and the respective runners are passed through the primary shoe sole forming gate and the secondary shoe sole forming gate to the primary shoe sole. A shoe two-step injection molding mold has been proposed in which the molding cavity and the side of the secondary shoe sole molding cavity are communicated with each other. When two-color soles are injection-molded using this mold, the primary shoe sole molding material and the secondary shoe sole molding material can be put into every corner of the primary shoe sole molding cavity and the secondary shoe sole molding cavity for a short time. However, when injection molding the primary shoe sole, the primary shoe sole molding runner runs on the mating surface of the bottom mold and the side mold. Excessive injection pressure is applied to this mating surface by the injected primary shoe sole molding material, and the primary shoe sole molding material exudes along this mating surface, which solidifies to form burrs and primary shoe sole molding. When the rear bottom mold is lowered to form the secondary shoe sole molding cavity, burrs formed on the mating surfaces of the bottom mold and the side mold may cause the bottom mold to be misaligned, hindering the bottom mold from descending. Side mall Or the mating surface is worn is offset in, burrs enters the secondary shoe sole mold cavity, when the second sole injection molding, there is a disadvantage that the secondary sole is contaminated. In particular, the occurrence of burrs that contaminate the secondary shoe sole is further exacerbated by the uneven wear of the mating surfaces of the bottom mold and the side mold, and such a two-step injection-molded shoe sole has a problem in terms of durability. was there.

(Problems to be Solved by the Invention) The present invention provides a multi-color shoe sole injection molding die that does not contaminate the secondary shoe sole during molding of the secondary shoe sole and has excellent durability. Is what you are trying to do.

(Means and Examples for Solving Problems) The present invention will be described below with reference to the accompanying drawings. In this invention, a bottom mold 1 that can be raised and lowered and a side mold 2.2 that can be opened and closed are provided.
And the last mold 3 constitute at least a primary shoe sole molding cavity 4a and a secondary shoe sole molding cavity 4b, and moreover, the primary shoe sole molding runner 5a is run in the bottom mold 1 in a tunnel shape. Is communicated with the primary shoe sole molding cavity 4a through the primary shoe sole molding gate 6a, and the secondary shoe sole molding runner 5b is connected to the bottom mold 1.
And run along the mating surface of side mold 2
The gist of the present invention is a multicolor shoe sole injection molding die characterized in that it is communicated with a secondary shoe sole molding cavity 4b at its side portion via a secondary shoe sole molding gate 6b.

In the present invention, the primary shoe sole forming runner 5a is run from the heel portion 11 as a starting point to the toe portion 12 along the center side in the longitudinal direction of the bottom mold according to the shape or wall thickness of the primary shoe sole. It is acceptable to use the heel portion 11 as a starting point for the outer side 13 or the inner side 14 of the bottom mold.
You may run it diagonally over. In any case, the primary shoe sole molding runner 5a has a cross-sectional shape that is gradually enlarged from the tip end side 51a to the root side 52a located at the heel of the bottom mold so that the primary shoe sole injection is performed. The primary shoe sole molding material solidified in the primary shoe sole molding runner 5a at the time of molding has its root 52a '.
It can be removed by simply pulling it from.

The primary shoe sole molding runner 5a is a primary shoe sole molding gate 6a.
The primary shoe sole molding cavities 4a are communicated with the primary shoe sole molding cavities 4a by way of a plurality of primary shoe sole molding gates 6a depending on the shape or thickness of the primary shoe sole.

When the primary shoe sole a and the toe reinforcing piece c are integrally molded at the same time, a plurality of primary shoe sole molding gates 56a are provided to communicate with the leading end side 51a of the primary shoe sole molding runner, and the primary shoe sole. The primary shoe sole molding gate 61a opened at the toe portion of the molding cavity 4a or closest to the toe portion is replaced with another gate 62.
a, 63a, the injection molding filling of the primary shoe sole molding material into the toe reinforcing piece molding cavity 6c having a complicated curved structure continuous with the toe portion of the primary shoe sole molding cavity 4a is performed. It can be smooth.

In the present invention, even if the secondary shoe sole molding runner 5b runs along the outer surface 15 of the bottom mold 1 and the mating surface of the outer side mold 2, the inner surface 16 of the bottom mold and the inner side mold 2 are It may run along the mating surface, or it may run along both mating surfaces.

(Operation of the Invention) Since the present invention is configured as described above, the primary shoe sole molding cavity 4a is formed by the last mold 3 in which the cover 7 is hung, the bottom mold 1, and the side mold 2.2.
After forming the first shoe sole molding runner 5a and the primary shoe sole molding gate 6a, the primary shoe sole molding cavity 4 is formed.
The primary shoe sole molding material is injection-introduced into a to mold the primary shoe sole a, and the primary shoe sole a is integrally bonded to the lower surface of the cover 7. Next, the bottom mold 1 is lowered to form the secondary shoe sole molding cavity 4b below the primary shoe sole a, and then the secondary shoe sole molding runner 5b and the secondary shoe sole molding gate 6b are used to mold the secondary shoe sole. A secondary shoe sole molding material, which is different from the primary shoe sole molding material, is injected into the cavity 4b to mold the secondary shoe sole b and adhere it integrally to the primary shoe sole a.

(Effects of the Invention) The multicolor shoe sole injection molding die of the present invention is configured and used as described above, but when injection molding the primary shoe sole a, the primary shoe sole molding runner 5a is used. Runs in the bottom mold 1 in a tunnel shape, so that when the primary shoe sole is molded as in the conventional case, an excessive injection pressure is not applied to the mating surfaces of the bottom mold and the side mold, and The shoe sole molding material does not exude to the mating surface of the bottom mold and the side mold to generate burrs, and therefore, when the secondary shoe sole is injection-molded, the secondary shoe sole is not contaminated by the burrs.

Further, when the bottom mold is lowered after forming the primary shoe sole to form the secondary shoe molding cavity, burrs do not hinder the lowering of the bottom mold, and therefore the mating surfaces of the bottom mold and the side mold are offset. It is possible to provide a multicolor shoe sole injection molding die having excellent durability because it is not worn away. When molding the secondary shoe sole, the secondary shoe sole molding runner 5b formed along the mating surfaces of the bottom mold and the side mold as usual and the secondary shoe sole molding gate 6b communicating with the runner 5b are used. Through the side of the secondary shoe molding cavity, the secondary shoe molding cavity 4b
Accurately inject secondary shoe sole molding material into every corner of the
A secondary shoe sole with an excellent appearance can be molded.

[Brief description of drawings]

The drawings show an embodiment, FIG. 1 is a plan view thereof, and FIG. 2 is an A- of FIG. 1 at the time of molding a primary shoe sole.
FIG. 3 is a cross-sectional view taken along line A, FIG. 3 is a cross-sectional view taken along line BB in FIG. 1 when forming a primary shoe sole, and FIG. 4 is A- in FIG. 1 during forming a secondary shoe sole. It is sectional drawing in the A line. Explanation of symbols 1. Bottom mold, 11 ... Heel part 12 ... Toe part, 13 ... Outer side 14 ... Inner side, 15 ... Outer side 16 ... Inner side, 2.2 Side mold 3. Last mold 4a. Primary shoe sole molding cavity 4b. Secondary shoe sole molding cavity 5a. Primary shoe sole molding runner 51a ... Tip side, 52a ... Root side 52a '... Root portion of primary shoe sole molding material solidified in 52a 6a (61a, 62a, 63a) Primary shoe sole molding gate 6b ． Secondary shoe sole molding gate 6c. Toe reinforcing piece molding cavity 7. Covered a. Primary sole, b. Secondary sole, c. Toe reinforcement piece

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Claims (1)

[Claims] 1. A bottom mold 1 which can be raised and lowered, a side mold 2.2 which can be opened and closed, and a last mold 3,
At least the primary shoe sole molding cavity 4a and the secondary shoe sole molding cavity 4b are configured, and the primary shoe sole molding runner 5a is run in a tunnel shape in the bottom mold 1 to form the primary shoe sole molding gate. The secondary shoe sole molding runner 5b is made to communicate with the primary shoe sole molding cavity 4a via 6a, and the secondary shoe sole molding runner 5b is run along the mating surface of the bottom mold 1 and the side mold 2 to form the secondary shoe sole molding gate 6b.
A multicolor shoe sole injection molding die, characterized in that it is communicated with the secondary shoe sole molding cavity 4b at its side portion via.