JPH031804A - Manufacture of injection molded shoe with air vent in sole - Google Patents

Abstract

PURPOSE:To manufacture an injection molded shoe with air vent holes in its sole simultaneously with molding a sole by a method wherein a male last is mounted a quarter with a filter pad in contact with a part of a midsole of ventilation, which is combined with a female last of a sole molding metal pattern, and the filter pad is inserted needles projecting from a part of the female last into a cavity, and molding sole resin is injected into the cavity. CONSTITUTION:A midsole 3 using air permeable materials is pasted with a filter pad 4 of ventilation to the under surface corresponding to a tread-on part of it. A male last 5 is mounted with a quarter 1 including the midsole 3, which is combined with a female last composed of a bottom mold 6 and a side mold 7. On the side mold 7, a plurality of needles 8 are planted in parallel projecting inside to each pasting position of the filter pad 4. Then molding sole resin such as polyurethane or PVC, etc., is injected into a cavity 10 between both lasts from an injection port 9. When removing the lasts after the resin is solidified, an injection molded shoe 13 is ready having a sole 12 made small holes 11 in the side by pulling out of the needles 8.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a method of manufacturing injection molded shoes.

[Prior Art] Injection molded shoes are made by integrally molding a sole made of injection resin into a shoe lace. When an impermeable material such as synthetic leather is used for the shoe cover, there is a disadvantage that the shoe does not have breathability inside the shoe and tends to get stuffy when worn.

In general, in order to ensure breathability inside the shoe, shoes are known that have holes made in the shoe sole, or shoes that are equipped with an air intake and exhaust mechanism to more actively increase breathability. .

[Problems to be Solved by the Invention] However, when opening a ventilation hole in the sole of a shoe, simply making a hole that passes through the sole is not practical because moisture and mud will directly enter the shoe; Even if a structure is adopted to prevent the infiltration of dirt or mud, or an intake/exhaust mechanism is incorporated, a ventilation mechanism or structure is incorporated during the manufacturing process of the shoe or as a post-process to the product. This required a separate process.

SUMMARY OF THE INVENTION An object of the present invention is to provide a method for manufacturing an injection molded shoe having ventilation holes in the sole at the same time as the sole is molded using a shoe sole injection process.

[Means for Solving the Problems] In order to achieve the above object, in the method of manufacturing injection molded shoes having ventilation holes in the sole according to the present invention, the ventilation A shoe cover equipped with a filter pad made of material is attached to a female mold, and this is combined with the female mold of a shoe sole mold, and a needle protruding from a part of the female mold into the cavity is used to clamp the mold. The needle is inserted into the filter pad using the action, injects sole molding resin into the cavity, removed from the mold after the resin hardens, and the needle is pulled out and inserted into the pad from the outer surface of the sole made of cured resin. The sole of the shoe is characterized by forming a ventilation hole that reaches the bottom of the shoe.

[Example] Embodiments of the present invention will be described below with reference to the drawings.

Figures 1 (a), (b), and (c) show the state in which the shoe cover 1 is attached to the female mold 5, and this is hung into the female mold formed by the combination of the sole mold 6 and the side mold 7. . In the present invention,
An impermeable material such as synthetic leather is used for the side legs 2 of the shoe cover 1, but a breathable material is used for the insole 3 sewn to the shoe cover 1 to which the sole of the shoe is attached. . However, since the insole 3 of the shoe cover 1 of an injection molded shoe is usually made of a porous material in order to firmly bond the injection resin, it is not a particular problem to use a breathable material for the insole 3. A breathable filter pad 4 is attached to the lower surface of the midsole 3 at a location corresponding to the tread portion. The filter pad 4 may be attached to any location, but it is necessary to select the inner side of the edge of the midsole 3 so as not to expose it to the circumferential surface of the outsole after molding.

Examples of materials used for the filter pad and insole are shown below.

a Filter pad materials (1) Water-repellent felt (2) Water-absorbent felt (3) Acrylic fiber felt (4) Non-woven fabric (5) Polyurethane foam (6) Polyethylene foam (7) EVA foam (s) PVC foam (9) Rubber sponge (10) Leather laminate b Insole material (1) Sweat-absorbing, quick-drying fiber (3) Sweat-absorbing, bi-dispersible nonwoven fabric (4) Moisture-permeable, waterproof material (5) Waterproof, highly moisture-permeable, sweat-absorbing, antibacterial fiber (6) Water-absorbing fiber (cotton, non-woven synthetic fiber) (7) Breathable, moisture-permeable nonwoven fabric (8) Leather The shoe cover 1 including the insole 3 is coated on the female mold 5, and this is used as the female mold. The filter pad 4 attached to the inner sole 3 is attached to the side die 7 by inserting a plurality of needles 8 into the inner side at different positions. They are planted parallel to each other. The protruding length of each needle 8 is set to a length that reaches the inside of the filter pad 4 from the edge of the inner sole 3 when the mold is clamped.

Therefore, when the male mold 5 covered with the shoe cover 1 is suspended into the female mold and the side mold 7 is clamped, each needle 8 is released from the side surface of the filter pad 4 attached to the lower surface of the midsole 3 as shown in the figure. Pierce.

Next, a shoe sole molding resin such as polyurethane or PVC is injected into the cavity lO between both molds through the injection port 9,
When the mold is removed after it has hardened, an injection molded shoe 13 having an outsole 12 with a small hole 11 opened on the side surface is obtained by pulling out the needle 8 as shown in FIG. Said small hole I
+ reaches the filter pad 4 embedded in the shoe sole from the side of the shoe sole 12, and the filter pad 4 is connected to the shoe cover 1.
Since it communicates with the inner sole 3, the small hole 11 becomes a ventilation hole.
The interior of the shoe communicates with the outside through the sole 12, allowing air to freely flow into and out of the shoe.

In the above example, the needle 8 is planted in the side mold 7, but alternatively, as shown in Fig. 3, the needle 8 is planted north from the bottom mold 6 and the filter pad 4 is pierced from the bottom surface when the mold is clamped. You can do it like this. In this case, of course, a small hole is opened in the bottom surface of the sole of the shoe.

[Effects of the Invention] As described above, according to the present invention, the mounting position of the filter pad can be set freely and only a shoe sole molding mold with needles planted in preset positions of the side mold or the sole mold is used. By performing an injection molding process using a conventional method, it is possible to perform a ventilation treatment on the sole at the same time as molding the sole of the shoe.

Furthermore, according to the present invention, by selecting the materials of the filter pad and the insole, moisture permeable, waterproof, and dustproof effects can be obtained.Furthermore, by using the filter pad with a high porosity, it is lightweight and has a high impact absorption effect. You can get molded shoes.

[Brief explanation of the drawing]

Fig. 1(a) is a cross-sectional side view of a shoe mold in the manufacturing process of the present invention, Fig. 1(b) is a bottom view with the sole mold removed, and Fig. 1(c) is the C of Fig. 1(a). 2 is a side view of an injection molded shoe obtained by the method of the present invention, and FIG. 3 is a section corresponding to the section taken along line C-C in FIG. 1(a) showing another example. FIG. ■...Shoe cover 2...Side leg cover 3...
Insole 5...Female mold 7...Side mold 11...Small hole (ventilation hole) 13...Injection molded shoes

Claims (1)

[Claims] (1) Attach a shoe cover with a filter pad made of a breathable material in contact with a part of the bottom surface of the breathable insole to the male mold, and combine it with the female mold of the mold for forming the sole of the shoe. A needle protruding into the cavity from a part of the mold is inserted into the filter pad using the mold clamping action, a shoe sole molding resin is injected into the cavity, and after the resin hardens, the mold is removed. A method of manufacturing an injection molded shoe having a ventilation hole in a shoe sole, characterized in that the needle is pulled out to form a ventilation hole that reaches the pad from the outer surface of the sole of the shoe made of a cured resin.