JPS5834121B2 - Manufacturing method for shoes with rolled soles - Google Patents

Description

[Detailed description of the invention] The present invention relates to a method for manufacturing shoes with rolled up soles.

As is well known, volleyball is played indoors.
Badminton, ping pong, etc. involve intense movements, which often result in slips and falls, which interfere with the competition.

In order to prevent such accidents, shoes with so-called rolled-up soles, in which the periphery of the sole is raised up on the side surfaces of the toes, rear heel, etc., to provide anti-slip properties, have been preferred.

Conventionally, shoes with roll-up soles have been manufactured using a method in which an unvulcanized rubber compound is vulcanized in a press mold, simultaneously formed into the sole and attached to the underside of the shoe, or an unvulcanized rubber compound is rolled in a calendar. It was manufactured by punching a sheet into the shape of a shoe sole, pasting it on the underside of the shoe, and vulcanizing it with hot air.

However, in the former method, a sole that has already been vulcanized is used during the processing process, so the periphery of the sole is molded to the curved surfaces of the toe and back of the heel. Therefore, adhesion tends to be insufficient, and if you try to use a sole with a periphery that matches the curved surface of the side surface of the shoe in order to achieve sufficient adhesion, you will end up with a complicated and large shoe sole with a carved surface on the side surface. This method requires a heavy press mold and has the disadvantage that it is difficult to remove the mold.

On the other hand, in the latter method, since an unvulcanized sole is used during the processing process, it is easy to fit the sole to the curved surfaces such as the toe area on the side of the shoe and the back of the heel, which improves processability. Although the adhesion to the underside of the shoe is sufficient, due to the limitations of calender rolling, soles with only simple patterned contact surfaces with no sharp lines or shallow engravings were obtained, and the thickness also varied. The drawback was that it was difficult to obtain shoes with excellent slip resistance and comfort.

In an attempt to eliminate the above-mentioned drawbacks, the present invention uses a shoe sole that has a deeply engraved and intricately patterned contact surface and can be freely set in thickness using a processing process of Sino-American vulcanization. This is what we are trying to achieve.

The sole of the present invention used in the processing process is obtained by placing an unvulcanized rubber compound that has plasticity at room temperature or a relatively low temperature and has a small elastic recovery rate upon vulcanization into a press mold, and vulcanizing it at room temperature or a relatively low temperature. It is a pressure-molded, unvulcanized product, and specific rubber compounds include styrene-butadiene block copolymer rubber,
A rubber consisting of a mixture of styrene-butadiene block copolymer rubber and polybutadiene rubber in any proportion, or a mixture of styrene-butadiene block copolymer rubber with any other rubber as a main component, and a silicic acid filler of 40 PHR or more ,
Alternatively, 40 PHR or more of reinforcing carbon black or a mixture of a silicic acid filler and carbon black is added, and if necessary, other rubber compounding agents are added and kneaded.

In the styrene-butadiene block copolymer rubber used in the present invention, the styrene block part contributes to fluidity when heated and improves mold flow, and when cooled it aggregates and acts like a crosslinking point. Compared to styrene-butadiene random copolymer rubber, styrene-butadiene random copolymer rubber has a wider molecular weight distribution range and fewer long chain branches, so it shrinks and expands less during processing and has good mold flow, making it possible to produce products with deep and complex patterns. , it can be obtained as a clear image with high dimensional accuracy.

The silicic acid filler is generally called white carbon, and those commercially available under trade names such as VitaSeal, Carplex NibSeal, Solex, Toxyl, and Starsil are used, and the carbon black is SRF.
, HMF, FEF, CPF, SAF, EPC, HPC, etc. are used.

In addition to the above-mentioned reinforcing fillers, commonly used rubber compounding agents such as sulfur, vulcanization aids, vulcanization accelerators, activators, anti-aging agents, softeners, and other general fillers are simultaneously mixed. I can do it.

An unvulcanized shoe sole that has been pressure-molded in a press mold as described above is rolled up at a predetermined portion and then glued to the lower surface of the shoe sole suspended in the shoe last, and then pressurized in a vulcanization can. Vulcanize the sole together with the adhesive using hot air to obtain the shoe of the invention with a rolled up sole.

In the present invention, since the sole to be attached to the lower surface of the shoe sole can be flat, a lightweight and relatively simple press mold can be used, and the sole can be attached in an unvulcanized state. Therefore, the rolled-up part can easily fit into curved surfaces such as the toe part and the rear part of the heel on the outer surface of the shoe, and a shoe with strong adhesion can be obtained.

In addition, since the shoe sole is molded by pressurized flow in a press mold, the lines are sharp and the carvings are deep, and the thickness can be varied as desired, making it possible to obtain shoes with excellent slip resistance and comfort. I can do it.

Example Styrene-butadiene block copolymer rubber The mixture was kneaded according to the above formulation to obtain an unvulcanized rubber compound.

- It was aged day and night at room temperature, rolled to approximately the thickness of a shoe sole, and punched into strips.

A 70°C bottom mold with a carved pattern on the bottom of the cavity and 7
Place in a press mold consisting of an upper mold at 0'C and pressurize for 20 seconds.
A shoe sole in an unvulcanized state was obtained.

The adhering surface of the sole was wiped with a solvent, adhesive was applied to the lower surface of the shoelace suspended in the shoe last, and the sole was attached to the lower surface of the shoelace while rolling up the toe and rear part of the heel.

The sole and adhesive were cured by placing the shoe in an indirect vulcanizer at 135°G and an air pressure of 3 kg/- for 50 minutes, and the toe part 2 and A shoe having a sole 4 with a rolled up rear heel 3 was obtained.

[Brief explanation of drawings]

FIG. 1 shows a perspective view of a shoe with a rolled-up sole manufactured according to an embodiment of the present invention, in which 1 is the collar, 2 is the toe portion of the sole 4, and 3 is the rear heel portion of the sole 1. be.

Claims (1)

[Claims] 1. Place an unvulcanized rubber compound that has plasticity at room temperature or relatively low temperature and has a small elastic recovery rate upon vulcanization into a press mold,
The shoe sole is molded under pressure at room temperature or at a relatively low temperature to form a shoe sole, and the shoe sole is pasted on the lower surface of a shoelace suspended in a shoe last while being rolled up around its periphery, and then vulcanized with hot air. A manufacturing method for shoes with rolled soles.