JPS5820601B2 - Gomukutsuzokooyuusurukutsunoseizohou - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing shoes with rubber soles, and more particularly to a method of manufacturing shoes with rubber soles in which molding of the rubber sole and adhesion to the underside of the shoe are performed simultaneously. .

As is well known, methods for manufacturing rubber shoe soles include manufacturing a rolled sole using a calendar, manufacturing a mold sole using a press vulcanizer, and manufacturing a mold sole using an injection molding machine.

However, the method of manufacturing rolled soles using a calendar can only produce simple designs and patterns, while the method of manufacturing molded bottoms using a press vulcanizer can produce designs, patterns, and intricate designs that match the trends. Although there are advantages to be obtained, the molding time is long and inefficient, and in addition, when adhering, puffing and pasting must be done carefully.

On the other hand, the method of manufacturing the mold bottom using an injection molding machine is highly efficient, but it requires a large amount of equipment, and the mold used requires strength, so it has the drawback that it is difficult to change the model due to cost. Was.

The present applicant previously filed Japanese Patent Application No. 39-73746.
-21930) and Japanese Patent Application No. 71911/1989, to eliminate the drawbacks of the method of manufacturing mold bottoms using a press vulcanizer.

Japanese Patent Application No. 39-73746 (Japanese Patent Publication No. 46-21930) and Japanese Patent Application No. 46-71911 are designed to increase the rotation rate of the mold used in a press vulcanizer to shorten molding time and improve efficiency. The rubber compound is simply molded in the mold of a press vulcanizer without heating and vulcanizing, and then it is taken out of the mold. This is a method in which hot air vulcanization is performed using a vulcanizer or the like.

When filling a generally known rubber compound for shoe soles into a mold with a design, pattern, etc. and pressurizing it for several minutes at room temperature,
Since the compound has a large elastic recovery, it gradually loses its shape after being removed from the mold, making it impossible to produce a vulcanized rubber product with accurate size and design.

Of course, if the molding temperature is raised within the range for the purpose of increasing the plasticity of the rubber compound during pressurization, the rubber compound will have fluidity and will be easier to mold, but on the other hand, the surface will be in a foamed state when taken out from the mold, and the surface The designs and patterns of rubber have various disadvantages such as deformation due to softening of the rubber and increased risk of premature vulcanization.

Patent application invented in 1978 to solve the above-mentioned drawbacks
-73746 (Japanese Patent Publication No. 46-21930) is a method in which 40 parts by weight or more of a silicic acid filler is added to 100 parts by weight of rubber whose main component is a chain polymer without aromatic side chains, and is used together with general rubber compounding agents. This is a rubber molding method in which the rubber is kneaded, molded at room temperature or at a relatively low temperature, and then taken out from the mold unvulcanized and then vulcanized.
6-71911 is a solution-polymerized styrene-butadiene copolymer rubber, a mixture of a solution-polymerized styrene-butadiene copolymer rubber and a polybutadiene rubber in any proportion, or another product whose main component is a solution-polymerized styrene-butadiene copolymer rubber. A silicic acid filler 40 is added to the rubber made of a mixture with any rubber.
Carbon black 4 with PHR or higher or reinforcing properties
0PHR or more, or a mixture of silicic acid filler and the carbon black is added to 40PHR or more, kneaded with general rubber compounding agents, molded at room temperature or relatively low temperature, and taken out from the mold unvulcanized. , which is vulcanized in hot air using a vulcanizer or the like without using a mold.

In order to manufacture shoes with rubber soles by the method of the above two applications, an unvulcanized rubber sole molded at room temperature or relatively low temperature is applied to the lower surface of the shoelace attached to the last with an adhesive or the like. It must be affixed using a vulcanizer, placed in a vulcanizing can, etc., and vulcanized in hot air.

The present invention is a development and improvement of the above two inventions, and eliminates the process of attaching the unvulcanized rubber shoe sole molded at room temperature or relatively low temperature to the lower surface of the shoe. This is intended to prevent deformation of the rubber sole of the sulfur shoe.

The present invention uses the same unvulcanized rubber compounds as those used in the above two inventions, that is, natural rubber, synthetic polyisoprene rubber, solution polymerized styrene-butadiene copolymer rubber, polybutadiene rubber, and butadiene-acrylonitrile copolymer rubber. one kind or a mixture thereof, or one of these
40 PHR or more of silicic acid filler, or 40 PHR or more of carbon black having reinforcing properties, or 40 PHR or more of a mixture of silicic acid filler and the carbon black in a mixture with other rubber whose main component is a seed or a mixture thereof.
The above is added and kneaded with general rubber compounding agents to form an unvulcanized rubber compound. After aging and rolling into the required raw leather, the rolled sheet is cut into two shoe sole shapes and placed in the cavity of the shoe sole mold. Then, combine the last with the cover attached with the sole mold, press the last and the sole mold at room temperature or relatively low temperature, and cut the unvulcanized rubber in the cavity of the sole mold. The sheet is formed and adhered to the underside of the shoe at the same time, and then taken out from the sole mold and subjected to hot air vulcanization 1 to produce shoes.

In carrying out the present invention, the unvulcanized rubber sheet to be placed in the cavity of the sole mold should preferably have an origin and shape close to that of the sole, and when molding and pressure bonding, the temperature is usually 20°C to 80°C. It is carried out at a temperature of about ℃.

Furthermore, when a bag-stitched cloth cover is used as the shoe cover, the unvulcanized rubber shoe sole and the cover can be sufficiently adhered to each other without the use of any particular adhesive.

Since the present invention simultaneously molds the unvulcanized rubber sheet into the sole and adheres it to the lower surface of the shoe cover, there is no need for any pasting process, and when using a bag-stitched shoe shoe, there is no need for a gluing process. There is no fear that the molded unvulcanized rubber sole will be deformed or contaminated by pasting work, etc., and there is no need to consider the storage time and location.

Of course, there is no process for transporting only unvulcanized rubber soles.

In addition, in the process of forming the unvulcanized rubber sheet into the sole of the shoe and pressing it onto the lower surface of the shoe, a highly fluid unvulcanized rubber compound is used, so the pressing force, that is, the pressing force, is not significantly reduced. This is not necessary, and therefore a low-cost last with relatively low mechanical strength can be used.

Furthermore, the time required to form the sole in the mold is usually 10 to 2
It only takes a short time of 0 seconds, and the work itself is simple and suitable for mass production.Furthermore, if desired, after gluing the rubber sole to the underside of the shoe, a peripheral tape with an appropriate design pattern can be easily applied. It has many excellent features, such as being able to produce a handmade taste and improve product value.

Example formulation Solution polymerized styrene butadiene Kyodo 70 Weight-related rubber Polybutadiene rubber 30 Sulfur
2 Zinc white 3 Stearic acid 2 Vulcanization accelerator 2-mercaptobenzo 1.5 Thiazole vulcanization accelerator diphenylguanidine 0.5 White carbon 50 Part by weight activator
5 〃Spindle oil
40 〃Kumaron resin
5 〃Sub 15〃 According to the above formulation, knead with a roll machine and age at room temperature for 24 hours.

After aging, it is rolled to a size of 1.3 crfL and cut into two pieces in the shape of shoe soles with a size of 25 cm.

This was placed in the cavity of a shoe sole mold of size 25crfL heated to a temperature of 70°C, and the last with the bag stitched was combined with the shoe sole mold at a gauge pressure of 4kg/Cn.
Press i for 15 seconds.

Thereafter, the shoe sole is removed from the shoe sole mold i, and the shoe sole is placed in a vulcanizing can at 125°C for 45 minutes with the shoe cover attached to the bottom surface attached to the last to complete the shoe manufacturing. do.

Claims (1)

[Claims] 1 Natural rubber, synthetic polyisoprene rubber, solution-polymerized styrene-butadiene copolymer rubber, polybutadiene rubber, butadiene-acrylonitrile copolymer rubber, or a mixture thereof, or one of these or a mixture thereof In a mixture with other rubbers mainly composed of
Add 40 PHR or more of silicic acid filler, 40 PHR or more of reinforcing carbon black, or 40 PHR or more of a mixture of silicic acid filler and carbon black, and knead with general rubber compounding agents to form an unvulcanized rubber compound. After ripening and rolling to the required originality, the rolled sheet is cut into the shape of a shoe sole, placed in the cavity of the sole mold, and the last with the cover attached is combined with the sole mold and heated at room temperature or The last and the sole mold are pressed together at a relatively low temperature, and the unvulcanized rubber cut sheet in the cavity of the sole mold is simultaneously formed and bonded to the lower surface of the shoe sole, and then released from the sole mold. A method for manufacturing shoes with rubber soles, characterized by performing hot air vulcanization.