JPS5910201B2 - Shoe manufacturing method using direct sawing method that does not cause defects at the upper end of the peripheral tape - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing shoes using a direct sawing method that does not produce a defective portion at the upper end of the peripheral tape.

Shoes made of synthetic leather and foamed polyurethane soles are lightweight, comfortable to wear, have a good appearance, and are highly durable, so they are widely used in sports shoes, leisure shoes, and the like.

Shoes with foamed polyurethane soles are manufactured by the unit sole method and the direct soling method, but the direct soling method requires fewer steps than the unit sole method, and the bonding of the sole to the sole is strong and reliable. Most of them are manufactured by this method.

The method of producing shoes with foamed polyurethane soles by the direct sewing method has many excellent features as described above, but when synthetic leather is used as the shoe cover, the foamed polyurethane raw material is When filled with foam, it expands upward while generating gas, and as it goes upward, the rising power of the foamed polyurethane raw material decreases, and the synthetic leather used as the cover has almost no breathability. As a result, the generated gas accumulates in the upper part, that is, the upper end of the circumferential tape, and the hollow part of the sole mold cannot be completely filled with foamed polyurethane, resulting in a so-called "gas pool" and a defective part at the upper end of the circumferential tape. It was happening.

The object of the present invention is to eliminate the drawbacks of the method of manufacturing shoes with foamed polyurethane soles by the direct sole method as described above.

When manufacturing shoes with foamed polyurethane soles using the direct sole method, the present invention provides a synthetic leather cover that is suspended from the last by forming an appropriate number of small holes around the upper end of the part where the peripheral tape is to be formed. The main idea is to use a synthetic leather cover made of synthetic leather.

It is sufficient that the small hole provided around the portion where the peripheral tape is formed has a size comparable to the needle hole of a sewing machine needle.

In the present invention, the mold cavity that forms the foamed polyurethane sole can be ventilated with the outside through small holes provided around the lower part of the synthetic leather cover, so that the foamed polyurethane raw material injected into the cavity and heated is When expanding upward while generating gas, there is no so-called "gas accumulation" at the upper end of the peripheral tape, and the polyurethane foam is thoroughly spread over the entire mold cavity, and no defects are created at the upper end of the peripheral tape. .

Embodiment As shown in FIG. 1, a sewing machine needle hole 3 is provided around the portion 2 of the synthetic leather jacket 1 where the peripheral tape is to be formed, and the sewing machine needle hole 3 is hung from the last 4.

Next, as shown in FIG. 2, the last 4 is combined with the sole side molds 5, 5 and the sole pace mold 6 to form a combined cavity 7, and a foamed polyurethane raw material 8 is injected through the injection hole 9 and heated to an appropriate temperature. After foaming and curing, the sole side molds 5, 5 are removed, the last 4 is pulled up from the sole pace mold 6, and as shown in FIG. Shoes having a foamed polyurethane sole 12 using a synthetic leather cover 1 were obtained.

[Brief explanation of drawings]

Fig. 1 is a side view of the synthetic leather cover used in the present invention suspended from the last, Fig. 2 is a vertical cross-sectional view showing the process of manufacturing a shoe having a foamed polyurethane sole of the present invention, and Fig. 3 is a side view of the synthetic leather cover used in the present invention. 3 shows a side view of a shoe with a foamed polyurethane sole obtained by the process of FIG. 2; FIG.

Claims (1)

[Claims] 1. At the last, a non-breathable synthetic leather cover is suspended and combined with a shoe sole mold, and foamed polyurethane raw material is injected into the mold cavity formed by the synthetic leather cover lower part and the sole mold and heated. Made of synthetic leather with an appropriate number of small holes around the upper end of the area where the peripheral tape is formed, in order to manufacture shoes in which the peripheral tape and sole are integrated by foaming and hardening and using the direct sole method. A method of manufacturing shoes by a direct sawing method that does not produce a defective part at the upper end of the peripheral tape, which is characterized by using a sash.