JPH0651001B2 - Injection molding shoe manufacturing method - Google Patents

Description

The present invention relates to an injection-molded shoe that can be manufactured by using a conventional side mold that does not change the mold even if the injection-molded shoe has a relatively thick cover. Manufacturing method.

[Conventional technology]

In a conventional method for manufacturing an injection-molded shoe, generally, a main body last in which a cover is hung, a side mold, and a bottom mold are fitted to each other by forming a shoe sole molding space therein, and then This is done by injecting a shoe sole molding material into the shoe sole molding space and injection molding the shoe sole integrated with the lower part of the hood.

The main body last is fitted into the side mold so that the lower peripheral edge of the cover is sandwiched between the main body last and the side mold.

Also, the length of the gap between the main body last and the side mold for holding the lower peripheral edge portion of the cover is determined by the protrusion of the fitting protrusion formed on the upper side of the inner surface of the side mold and protruding toward the main body last side. Determined by width.

[Problems to be Solved by the Invention]

By the way, the clearance between the main body last and the side mold for sandwiching the lower peripheral edge of the cover is thus determined by the protrusion width of the fitting protrusion formed on the upper side of the inner surface of the side mold and protruding toward the main body last side. Therefore, for example, when a relatively thick cover is used, it is necessary to use a separate side mold in which the protrusion width of the fitting protrusion is made shorter.

The present invention has been made on the basis of such a conventional technique, and an injection-molded shoe having a relatively thick wall can be manufactured by using a conventional side mold that does not change the mold. It is intended to provide a manufacturing method.

[Means to solve the problem]

According to the present invention, at least a lower peripheral portion of a cover is thinned to a predetermined thickness by press working, and after that, a main body last in which the cover is suspended, a side mold, and a bottom mold are formed inside for shoe sole molding. A space is formed and fitted, and at this time, the lower peripheral edge portion of the cover that is suspended in the main body last and the thickness of which is adjusted is pressed against the fitting projection portion provided around the inner surface of the side mold, Further, the present invention provides a method for manufacturing an injection-molded shoe, characterized by injecting a shoe-sole molding material into the shoe-sole molding space to injection-mold a shoe sole integrated with the lower part of the hood.

[Action]

In the method for manufacturing an injection-molded shoe according to the present invention, first, at least the lower peripheral portion of the cover is thinned to a predetermined thickness by press working.

By doing so, even an injection-molded shoe having a relatively thick cover can be manufactured using a conventional side mold that does not change the mold.

After that, the main body last in which the armor cover is suspended, the side mold, and the bottom mold are fitted with each other by forming a shoe sole molding void therein.

At this time, the lower peripheral edge portion of the cover, which is suspended in the main body last and whose thickness is adjusted, is pressed against the fitting projection portion provided around the inner surface of the side mold.

Next, an injection-molded shoe is manufactured by injecting a shoe-sole molding material into the shoe-sole molding space to injection-mold the shoe sole integrated with the lower part of the cover.

〔Example〕

Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.

In describing this embodiment, a sports shoe manufactured by injection molding will be taken as an example.

In the method of manufacturing an injection-molded shoe according to the embodiment of the present invention, as shown in FIGS. 1 to 3, first, at least the lower peripheral portion 11 of the covering 10 is thinned to a predetermined thickness by press working.

The cover 10 is a shoe upper component of an injection-molded shoe, and in this embodiment, the base material layer 101 is made of cloth such as woven cloth, non-woven cloth, and knitted cloth, and the intermediate layer is made of expanded vinyl chloride resin. And a surface layer 10 made of polyurethane resin
Although vinyl leather is used in which 3 and 3 are sequentially laminated,
The material is not necessarily limited to this, and for example, natural leather, artificial leather, synthetic leather, polyvinyl chloride leather, various synthetic resin sheets and polyurethane foam laminated sheets can be used. It should be noted that the lower peripheral edge portion 11 of the cover 10 is provided on the fitting projection portion 21 provided around the inner side surface 20a of the side mold 20 at least at the time of mold fitting as shown in FIGS. 4 and 5. It includes a part that

Further, the press working of the lower peripheral edge portion 11 of the cover 10 in this embodiment is performed at the same time as the cutting of the cover 10 and in addition to the embossing which is the designing of the surface 10a of the cover 10. However, it is not necessarily limited to this, and for example, the embossing process performed at the same time as the cutting process can be performed at a different time.

Further, the high-frequency processing method using the high-frequency processing machine H shown in FIG. 1 is adopted as the press working means in this embodiment, but it is not necessarily limited to this and, for example, normal heating / heating is used. Other processing means such as pressure processing and ultrasonic pressure processing can also be adopted.

Furthermore, the thickness of the covering 10 used in this embodiment is about 2.5 mm, and the thickness after pressing is 10 covering.
It is about 2 mm which is generally used as, but it is not necessarily limited to this.

Furthermore, the range of the cover 10 to which this press processing is applied has only to include at least the lower peripheral edge portion 11 as described above, and as shown in FIG. It may be processed.

The lower peripheral edge 11 in this embodiment does not require fine adjustment for setting the position of the fitting protrusion 21 of the side mold 20 during shoe molding, and thus the base side of the lower peripheral edge 11 is gradually thinned. However, it is not necessarily limited to this. For example, the lower peripheral edge portion 11 may be thinned at once.

By doing so, even an injection-molded shoe having a relatively thick cover 10 can be manufactured using the conventional side mold 20 that does not change the mold.

After that, as shown in FIG. 4 and FIG.
Body last 30 in which 0 is suspended, and side mold 20
And the bottom mold 40, and the void 5 for forming the sole in the inside.
Form 0 and fit.

At this time, the lower peripheral edge portion 11 of the covering 10 suspended in the body last 30 and having the thickness adjusted is the side mold 30.
It is pressed against the fitting protrusion portion 21 provided around the inner side surface 20a.

Then, again, the shoe sole molding material Z is placed in the shoe sole molding void 50.
Is injected to inject a shoe sole (not shown) that is integrated with the lower part of the armor cover 10 to manufacture an injection-molded shoe.

The shoe sole molding material Z may be a commonly used thermoplastic resin such as polyvinyl chloride, polyvinyl chloride copolymer, polyurethane, polyamide, polyolefin, polyolefin copolymer, ethylene vinyl acetate, polyester, etc. Synthetic resin can be used, and can be foamed or unfoamed if necessary. Further, additives such as fillers, plasticizers, stabilizers, antioxidants, ultraviolet absorbers, pigments and dyes can be used depending on the purpose.

Also, reacting and foaming polyol and polyisocyanate,
A polyurethane resin to be cured can also be used.

As described above, in the method for manufacturing an injection-molded shoe of the present invention, at least the lower peripheral edge portion 11 of the cover 10 is thinned to a predetermined thickness by press working, so that the injection having the cover 10 having a relatively thick wall is performed. Even molded shoes can be manufactured using the conventional side mold 20 that does not change the mold.

Although the embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and modifications and changes in structure and operation without departing from the scope of the invention are included in the present invention.

For example, in this embodiment, sports shoes manufactured by injection molding are taken as an example, but other shoes such as men's shoes, women's shoes, children's shoes, etc., which are injection molded, are also included in the present invention.

〔The invention's effect〕

The present invention uses a conventional side mold that does not change the mold even for an injection-molded shoe having a relatively thick cover by thinning at least the lower peripheral edge of the cover to a predetermined thickness by pressing. The effect that it can be manufactured is obtained.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a cutting and pressing process of a cover in a method of manufacturing an injection-molded shoe according to an embodiment of the present invention, and FIG. 2 is a cutting and pressing of a cover in a manufacturing method according to an embodiment of the present invention. An enlarged cross-sectional view showing the lower peripheral portion of the cover after the processing step, FIG. 3 is an enlarged plan view of the cover used in the method for manufacturing an injection-molded shoe of the embodiment of the present invention, and FIG. 4 is a view of the present invention. Sectional drawing which shows the shoe sole molding process in the manufacturing method of an Example, 5th
The figure is an enlarged cross-sectional view of a main part in the shoe sole forming step. Z: Shoe sole molding material 10; Cover 11; Lower peripheral edge portion 20; Side mold 20a; Inner side surface 21; Fitting protrusion 30; Body last 40; Bottom mold 50; Sole molding void 60; Shoe sole

Claims (1)

[Claims] 1. A shoe bottom molding in which at least a lower peripheral portion of a cover is thinned to a predetermined thickness by press working, and then a main body last in which the cover is suspended, a side mold and a bottom mold are formed. To form a space for fitting, and at this time, the lower peripheral edge of the cover, which is suspended in the main body last and whose thickness is adjusted, is pressed against the fitting protrusion provided around the inner surface of the side mold, In addition, a method for manufacturing an injection-molded shoe, characterized in that the shoe-sole molding material is injected into the shoe-sole molding space to injection-mold the shoe sole integrated with the lower part of the cover.