JPH07125105A - Manufacture of shoe - Google Patents

Abstract

PURPOSE:To mold a protrusion of a specified shape in the sole-contacting surface of the insole of injection molded shoes. CONSTITUTION:In a method for making shoes in which a prutrusion of a specified shape is formed on the sole-contacting surface of an insole by injecting molten thermoplastic synthetic resin or rubber into a cavity partitioned by a last mold 1, a side mold 2, and a bottom mold 3, a plate 4 is prepared in advance which has a non-penetrated or penetrated hole 5 corresponding to the protrusion to be formed in the insole. The plate 4 is stuck to the part corresponding to a sole in the last mold 1 by an appropriate means.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a method for manufacturing boots. More specifically, the present invention relates to a method for manufacturing a boot in which a plurality of protrusions having a predetermined shape are provided on the surface of the insole that contacts the sole of the foot.

[0002]

2. Description of the Related Art A so-called injection-molded shoe, which is manufactured in one step by injecting molten resin or rubber into a cavity defined by a last mold, a side mold, and a bottom mold, has a drawback that the entire sole is insole. Since it is in contact with the sheet, the breathability is deteriorated, and it tends to get stuffy, and the foot moves or slips in the shoe.

For the purpose of eliminating these drawbacks, injection-molded boots have been developed in which a plurality of protrusions are provided on the surface of the insole that contacts the sole of the foot.

A feature of the conventional method of manufacturing such type of injection-molded boot is that a recess corresponding to a projection having a desired shape is engraved in the foot-corresponding portion of the last mold.

A major drawback of this prior art method is the high cost of manufacturing the last mold. Normally, injection molding produces several pieces in one cycle, so
Considering various variable factors such as design differences, many last molds need to be prepared, and this conventional method must be improved.

[0006]

The problem to be solved by the present invention is to provide a so-called injection-molded shoe in which a projection having a predetermined shape is provided on the surface of the insole which is in contact with the sole, easily and at low cost. It is something that cannot be manufactured. Further problems and advantages to be solved by the present invention will be successively revealed below.

[0007]

Means for solving the problems are as follows. Resin or rubber is heated and melted and injected into a cavity defined mainly by a side mold, a last mold and a bottom mold, and a foot of an insole is formed. A method of manufacturing a shoe having a protrusion having a predetermined shape formed on the surface contacting the back; a predetermined thickness engraved with a through hole or a non-permeable hole corresponding to the protrusion to be formed on the insole in advance. Is prepared, and the plate is attached to a portion corresponding to the sole of the last mold by an appropriate means.

The plate used in the present invention is not particularly limited in material as long as it can withstand various conditions of injection molding, that is, temperature, pressure and the like, and has a predetermined thickness. Therefore, it is selected from any material such as aluminum, metal such as iron, leather, synthetic resin and wood.

The thickness of the plate used in the present invention is determined depending on the shape of the projection to be formed, particularly the height thereof. In the case of a non-permeable hole, if the thickness of the projection to be formed and the recess between the projections is not very small, the thickness of that part of the manufactured shoe will be thin, so the thickness of the plate It must be decided in consideration. However, in the case of the through hole, since a protrusion having a constant height is formed on the shoe sole having a constant thickness, it is not necessary to be nervous about this point.

[0010]

EXAMPLES FIGS. 1 and 2 are a sectional view showing the structure of a mold used in Example 1 and an enlarged sectional view of a plate used. 1 is a last mold, 2 is a side mold, 3 is a bottom mold, 5 is a recess, 6 is a back cloth knit, and 7 is a resin injection port. Reference numeral 4 denotes a plate, as shown in FIG. 2, a synthetic resin plate having a thickness of 4 mm and a maximum depth of 2 m.
m, and a recessed portion having a diameter of 6 mm, which is an impermeable hole. This plate was attached to the foot-corresponding part of the last mold with an adhesive tape, and injection-molded under the following conditions.

Injection cylinder temperature --180 to 200 ° C. Injection pressure -------- 100 to 110 kgf / cm ² Mold temperature ----- 45 to 50 ° C. Injection time ----- -3.0 to 4.0 ° C seconds / 0.5 feet Cooling time ---------- 100 to 150 seconds Full cycle --- 200 to 300 seconds

[0012]

[Example] In place of the plate used in Example 1, FIG.
Example 1 was repeated except that a plate 4'provided with a plurality of through holes 5'through the upper and lower sides was used as shown in FIG.

As a result of comparing the appearance and the comfort of the shoe manufactured by the method of the present invention and the shoe manufactured by the conventional method in which the recessed portion is previously carved in the foot-corresponding portion of the last mold, both are not different at all. .

[0014]

The following effects are obtained by the present invention described above. I. A shoe with the desired shape of protrusions on the surface of the insole is easily manufactured. B. Since it is not necessary to process the metal last mold itself, the cost is greatly reduced.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a cross-sectional view of a plate used in another embodiment of the present invention.

FIG. 3 is a sectional view of an essential part showing a through hole of the present invention.

[Explanation of symbols]

 1 Last mold 2 Side mold 3 Bottom mold 4 Plate 4'Plate 5 Impermeable hole 5'Transparent hole 6 Suspended knitted cloth 7 Resin injection port

Claims (1)

[Claims] 1. A thermoplastic synthetic resin or rubber is heated and melted and injected into a cavity defined by a last mold, a side mold, and a bottom mold, and a protrusion having a predetermined shape is formed on a surface of the insole which is in contact with the sole of the foot. In the method of manufacturing a shoe having the above-mentioned structure, a plate having a through hole or a non-permeable hole corresponding to the protrusion to be formed on the insole is prepared in advance, and this plate is prepared by using the last mold. A method characterized in that it is attached to the part corresponding to the sole of the foot by an appropriate means.