JPS5838200B2 - How to make injection molded shoes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention involves fitting a shoe last covered with a non-breathable pseudo-leather upper into a mold having a shaped space corresponding to the outer sole of the shoe. The present invention relates to a method of manufacturing injection molded shoes in which a sole forming solution is injected into a certain space of a hollow mold to integrally mold the upper and the sole.

Conventionally, when this type of shoe is molded by press-fitting the sole molding solution into the molding space, a non-breathable pseudo-leather upper cover is applied to prevent the sole molding solution from leaking out of the molding space. It is necessary to bring the molded shoe last into close contact with the edge of the pre-shaped mold, and because of this close contact, the molding space becomes almost sealed, and when the molding space is compressed, there is no place for the air inside to escape.

Therefore, conventionally, small holes leading to the outside were made in the mold, or a large number of small holes were made in the carapace itself, and the air inside was discharged to the outside through these holes. .

Therefore, in the case of the former type with micro-holes, the sole molding solution press-fitted into the certain shaped space enters the micro-holes.
There is a defect in the sole of the shoe that has a protrusion that goes into it, and
The latter, which had small holes drilled in the upper, had a defect in which the strength of the upper was compromised.

The present invention aims to eliminate such defects, and its feature is that a shoe last covered with a pseudo-leather upper is fitted into and brought into contact with the pre-form mold. The point is that the upper part of the upper part is provided with a breathable cloth to give it a certain shape.

That is, the present invention relates to a method of manufacturing injection molded shoes in which air in the molding space is released to the outside through the breathable cloth.

Hereinafter, embodiments of the present invention will be described based on the drawings.
1 to 3 show the first embodiment, in which a breathable cloth 1 is sewn to the upper a, and FIG. A strong cloth having breathability and waterproofness, such as a worn cotton cloth, is sewn to the part of the upper A covered with the last opening, which is in close contact with the ridge A' of the mold A.

In the figure, a is the instep made of non-breathable synthetic resin pseudo-leather.
and b is a shoe sole molding solution press-fitted into the molding space;
A foam such as polyvinyl chloride or polyurethane may be used as a material that is foam-filled and adhered to the bottom of the upper a using only its own foaming pressure by, for example, causing a foaming polymerization reaction.

Then, apply the upper cover a to which the cloth 1 has been applied to the shoe last opening,
When the cloth 1 is fitted closely to the protrusion A of the mold A, and the sole molding solution B is press-fitted into the formed space, the air inside or the foaming gas in the solution will be released. It is discharged to the outside from the cloth 1 and the sewn threads as shown by the arrow.

Figures 2 and 3 show a product that has been demolded and shaped.

In the figure, C indicates the sole cloth, and b' indicates the sole.

FIGS. 4 to 6 show another embodiment, in which the cloth 1 is glued at the same position as in the embodiment.

In the case where the cloth 1 is attached to the upper a by adhesive in this manner, the gas inside the breathable cloth 1 is discharged to the outside.

Further, since the sewing threads of the cloth 1 are not exposed to the outside as in the above-mentioned embodiments, a beautiful appearance can be provided.

Since the present invention has been carefully considered as described above, it is possible to provide injection molded shoes with high commercial value without leaking the sole or molding solution from the mold, and to prevent the sole or molding solution from leaking into the breathable fabric. Since it is press-fitted and bonded together, it is possible to prevent peeling from the boundary between the upper edge of the sole and the upper, which tends to peel off, due to long-term use.

In addition, the intended purpose can be achieved.

[Brief explanation of drawings]

Figures 1 to 3 show the first embodiment; Figure 1 is a vertical cross-sectional view showing the state in which it is in its preset state, Figure 2 is a perspective view of the first embodiment, and Figure 3 is taken along the X-X line. 4 to 6 show the second embodiment, FIG. 4 is a longitudinal sectional view showing the state of restraint, and FIG. 5 is a perspective view of the second embodiment.
FIG. 6 is a longitudinal sectional view taken along the Y-Y line. In the figure, a indicates the upper, b' indicates the sole, and 1 indicates the breathable cover.

Claims (1)

[Claims] 1. A shoe last covered with a non-breathable pseudo-leather upper is fitted into a mold having a certain space corresponding to the outer sole of the shoe, and then inserted into the molding space between the shoe last and the mold. In an injection molded shoe in which a shoe sole molding solution is injected to integrally form a shoe upper and a shoe sole, in a portion of the mold that fits into and comes into contact with a shoe-shaped mold in which the pseudo-leather upper is covered with the mold. A method for manufacturing injection molded shoes, characterized in that the upper is provided with a breathable cloth and then molded.