JPS6043121B2 - How to make injection molded shoes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing a shoe molded shoe with reinforced toe and sole parts.

Conventionally, toes made of steel or hard materials have been attached to the toes of shoes, such as mine safety shoes, to protect the toes.

However, when the shoe body is made of rubber-based material, many complicated manual operations are required in the manufacturing process. In addition, there have been proposals for a special method of attaching a protective toe (hereinafter referred to as a safety toe) made of a hard material to shoes that are injection-molded using synthetic resin as the material of the shoe body, but in that case, At present, no consideration has been given to protection for the back. In view of the above-mentioned circumstances, the present inventor has solved the conventional drawbacks by not only attaching a safety toe to the toe part of the shoe body, but also providing a safety toe on the bottom part of the shoe body to protect the sole of the foot. We have developed a relatively simple mass production method for molded shoes.

Hereinafter, the method of the present invention will be explained in detail with reference to the drawings.

FIG. 1 is a cross-sectional view illustrating the structure of a shoe made by the method of the present invention, FIG. 2 is a cross-sectional view of the toe section showing the state in which the safety toe used in the present invention is attached, and FIG.
The figure is a plan view of the midsole used in the present invention, and FIG. 4 is a sectional view taken along line A--A in FIG. 3 of the midsole. To explain the procedure of the present invention, first, a protective toe portion is prepared by pasting an elastic foamed synthetic resin on the inner surface of a safety toe.

The safety tow 4 used in the present invention is made of steel or hard synthetic resin, and as shown in FIG.
The unfoamed material 5a, which has not yet been foamed and has been adjusted in the amount of the foaming agent so that it foams, is applied to a thickness of about 1 wgn, and heated at 170 to 200°C over the entire outer surface of the safety tow.
The thermoplastic synthetic resin layer 6 which is thermally melted at a thickness of about lw
The toe part is made by laminating about n layers of adhesive.

Next, prepare the insole in advance in the same way.

The inner sole has a thickness of O, 3m77, as shown in Figures 3 and 4.
Both sides of the thick woven fabric 8 shown in the figure are made of a synthetic resin material that is compatible with the injection material of the shoe body and has a harder hardness than the shoe body.
Laminated sheets with a melting point of about 0°C are bonded together under heat to form grooves 10 on one side in accordance with the bending direction of the sole of the foot.
At the same time, both sides of the cloth 8 are impregnated with resin to make the insole 7 having an upper layer 9 and a lower layer 9''.We are now ready to start manufacturing shoes, and the lining cloth 11 is suspended from the inner mold. After affixing the upper layer 9 side of the insole 7 previously prepared to the bottom surface of the lining fabric and inserting and fixing the toe portion prepared in advance to the lining fabric on the toe side of the inner mold, the following steps are carried out as usual. The shoe body 1 is covered with an outer mold according to the law, and the shoe body material made of rubber or synthetic resin material such as vinyl chloride is injected into the gap between the inner and outer molds to mold the shoe cover 2 and the outsole 3. Let it form.

The shoes manufactured as described above have a safety toe on the toe side and a reinforced insole on the bottom surface, and therefore have many advantages as described below. That is, as shown in FIG. 1, the toe portion has a foam layer 5 between the lining fabric 11 and the safety toe 4, which is formed by foaming an unfoamed material 5a at the temperature at which the shoe body material is injected. Since the toes of the wearer do not directly touch the safety toe 4 and serve as a cushion, the toes can be sufficiently protected.

Furthermore, since the outer surface of the safety toe 4 is laminated with a thermoplastic synthetic resin, when the shoe body is injection molded, if a webbing is formed directly on the outer surface of the safety toe 4, the adhesion is likely to be insufficient. On the other hand, since the synthetic resin layer 6 is laminated on the outer surface of the safety tow 4, the cover 2 and the safety tow 4 are sufficiently adhered to each other, so there is no risk of them peeling off. On the other hand, as shown in FIG. 1, the bottom part has an insole 7 with excellent flexibility as shown in FIGS. 3 and 4 between the lining fabric 11 and the bottom 3 of the shoe body 1. This makes walking easier, and it also protects the soles of your feet. Even if sharp objects exist on the road surface, the hard laminated layer 9'' and the cloth 8 can prevent them from penetrating into the inside of the shoe.Furthermore, the bending of the sole from the toe side of the midsole to the non-stepping area can be prevented. Since a large number of grooves 10 are provided almost perpendicularly to the longitudinal direction of the insole, the sole bends easily and has the advantage of being easy to walk on.The method of the present invention is limited to boots. Of course, it is possible to apply it to short shoes.

[Brief explanation of drawings]

Fig. 1 is a sectional view illustrating the structure of the injection molded shoe according to the present invention, Fig. 2 is a sectional view of the toe section illustrating the state in which the safety toe used in the present invention is attached, and Fig. 3 is a sectional view illustrating the structure of the injection molded shoe used in the present invention. The plan view of the bottom, FIG. 4, also shows a sectional view taken along the line A--A in FIG. 3 of the middle bottom. In the figure, 1... shoe body, 2... shoe cover, 3... outsole,
4... Safety tow, 5... Foaming layer, 5a...
Unfoamed material, 6...Synthetic resin layer, 7...Insole, 8.
... Cloth, 9... Upper layer, 9''... Lower layer, 10... Hollow groove, 11... Lining fabric.

Claims (1)

[Claims] 1. A hard synthetic resin that is compatible with the material of the shoe body is placed on both sides of a cloth with a thickness of 0.3 mm or more on the bottom of the inner mold, which is hung by covering the inner mold with a lining cloth. The upper surface of the insole, which has grooves perpendicular to the length direction of the insole, is adhered to only the upper layer of the laminated layer, and the inner surface of the safety toe made of hard material is adhered to the lining cloth on the toe side of the inner mold. Coating or pasting an unfoamed material that foams at 130 to 200℃ on the entire outside surface
After inserting the toe part made of adhesively laminated thermoplastic synthetic resin that melts at ~200℃, cover it with an outer mold according to the usual method and cover the gap with the inner mold using rubber or synthetic resin. and a method for manufacturing injection molded shoes that has a safety toe on the toe side and a reinforced midsole on the bottom side by injection molding the shoe body such as the outsole.