JPS5835681B2 - shoe manufacturing method - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method of manufacturing shoes.

The insole, which forms part of the sole, serves as the base of the shoe, and is also an important part that serves as the so-called spine that connects the shoe, the sole, etc.

In addition, it is the place where the sole of the wearer's foot comes into contact, and it has a great effect on the feeling of wearing it.

Normally, the upper surface of the midsole is flat, and high-quality shoes or sports shoes usually have an arched part in contact with the sole.

However, even if an arch is provided in the part that contacts the flat tread, the upper surface of the insole is flat as a whole, and therefore, when the sole surface, which has a complex three-dimensional surface, comes into contact with the insole, the sole surface Unnatural forces act on the shoes, impairing the feeling of wearing them and, in extreme cases, causing blisters.

In an effort to eliminate these drawbacks, attempts have recently been made to make the entire midsole of some sports shoes, etc., where the wearer's feet come in contact with the same shape as the sole of the foot. ing.

For example, a method is generally adopted in which a foam insole is manufactured using a mold in which the lower surface of the mold has approximately the same shape as the sole surface of the foot, and the insole is inserted into the inside of the shoe.

However, according to this method, in addition to the last, a new mold, a mold clamping device, a pressurizing device, etc. are required to manufacture the insole, which increases the equipment cost and the process. There were many disadvantages such as increase in the amount of electricity and reduced efficiency.

The present invention aims to eliminate the above-mentioned drawbacks at once, and more specifically, the insole is molded on the lower surface of the bottom fabric that is sewn integrally with the sleeve. When the shoe is fixed, the upper surface of the insole is made to have the same shape as the sole surface of the wearer's foot.

The above purpose is to use a last whose surface where the bottom fabric that is integrated with the shoe cover contacts, that is, the bottom surface, has the same shape as the sole of the wearer's foot, and in this case, the bottom fabric can easily expand and contract even when subjected to weak external forces. This was achieved by using a sole fabric made of lubricious fabric and by allowing the midsole material to foam and push the bottom fabric upward.

Further details will be explained in the drawings.

That is, the shoes of the present invention are manufactured in the following manner as shown in FIG.

First, a lace-up cover 11 is attached to a last 8 having a bottom surface 7 in the shape of the sole of the foot, which is made by bag-stitching 10 the elastic sole cloth 1 and the lace-up cloth 9.

Next, the last 8 is placed on the upper edge of the cavity 14 formed by the side mold 12 and the pace mold 13,
A foamed polyurethane raw material 15 is injected into the sealed cavity 14 and foamed and hardened to obtain the inner sole 4 (see FIG. 1), and a hard and wear-resistant outsole 5 is formed on the lower surface of the inner sole 4 by an appropriate method. (1st
(see figure).

In this way, a shoe as shown in FIG. 1 with a sole 6 is obtained.

Since the last 8 used in manufacturing the shoes of the present invention has the entire lower surface 7 shaped like the sole of the foot, foamed polyurethane raw material 15 is injected into the sealed cavity 14 and foamed to harden. 4, the upper surface 3 of the insole 4 can be formed to have the same shape as the sole surface of the foot, and the bottom cloth 1 forming the uppermost surface of the insole 2 is made of elastic material such as stockinette. Since the material is used, polyurethane foam raw material 1
The elastic bottom cloth 1 is pressed against the bottom surface 7 of the last 8 by the pressure generated at the time of foam curing in step 5, and easily conforms to the bottom surface 7 of the last 8 to form a desired surface.

In this way, the use of stretchable fabric for the bottom fabric is not just for the feel it gives to the feet.
The present invention is characterized by an organic relationship between the shape of the bottom surface of the last, the elastic bottom cloth, and the pressure of the injected foamed polyurethane raw material during foaming.

EXAMPLE A last 8 having a lower surface 7 in the shape of the sole of the foot was prepared, and a jacket 11 made of a knitted bottom cloth 1 and a double weave cloth 9 sewn together 10 was attached thereto.

Next, the last 8 was placed on the upper edge of the cavity 14 formed by the side mold 12 and pace mold 13 of the injection molding machine.

Polyisocyanate (Toyo Sofuranate U-750P, Nippon Sofuran Co., Ltd.) is placed inside the sealed cavity 14.
and polyester mixture (Toyo Sofuranate U-75
Inject the mixture with 4R Nihon Nofuran Co., Ltd. and heat at 50°C.
The foam was heated to 100 mL and allowed to stand for 6 minutes to foam and harden to a specific gravity of 0.4.

A natural rubber outsole 5 previously obtained by press vulcanization was adhered with an adhesive to the lower surface of the foamed polyurethane insole 4 obtained by foaming and curing as described above to manufacture shoes.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view of a shoe obtained by the manufacturing method of the present invention, and FIG. 2 is a cross-sectional view of essential parts showing the manufacturing process of the shoe of the present invention.

Claims (1)

[Claims] 1. A lace cover 11 made by bag-stitching 10 the elastic sole cloth 1 and lace cloth 9 is attached to the last 8 having a lower surface 7 in the shape of the sole of the foot, and then a hollow portion formed by the side mold 12 and the base mold 13 is attached. The last 8 is placed on the upper edge of the last 8, and the foamed polyurethane raw material 15 is injected into the sealed cavity 14, and the foaming pressure presses the elastic bottom cloth 1 against the lower surface 7 of the last 8, causing the foam to harden and form an inner sole. 4, and forming a hard and wear-resistant outsole 5 on the lower surface of the midsole 4 by an appropriate method.