At present, the sole materials on the market are PU, PVC, NR, BR, SBR, etc. The sole materials used in the clean room are EVA, PU and PVC. This article briefly describes several shoe sole materials commonly used in cleanrooms.
At present, the sole materials on the market are PU, PVC, NR, BR, SBR, etc., while the sole materials commonly used in cleanrooms are: EVA, PU, ​​and PVC. Here's a brief introduction to these kinds of sole materials.
(1) EVA midsole: Ethylene-vinyl acetate copolymer is referred to as EVA for short. Compared with polyethylene, EVA introduces a vinyl acetate monomer into the molecular chain, thereby lowering the high crystallinity and improving the flexibility and impact resistance. , filler compatibility and heat sealing properties. The EVA midsole refers to the midsole of a shoe that is formed by high temperature heating after injecting EVA into the mold. It is also called a foam midsole. Traditional EVA uses hot pressing, EVA injection machine directly injection EVA particles into the machine mold inside, vacuum and sulfur about 400 seconds after the mold opens, the mold sole foam molding, and then through the hot, cold setting box stereotypes. The biggest feature is the high yield, a molding. Disadvantages are easily deformed, yellow for a long time, shrinking.
(2) PHYLON midsole: PHYLON originated in the United States, and the earliest shoe midsole was called PHYLON. Refers to injecting the material into the mold, after two high-temperature heating and burning the finished shoe midsole. Used for sports shoes series. The softness of PHYLON is controlled by the temperature. During the firing of the PHYLON midsole, the higher the temperature, the greater the density of the burned PHYLON and the harder it is. The smaller the PHYLON that naturally burns out, the lighter and softer it is, so the quality of the midsole can't be measured in terms of weight or hardness.
(3) Burning cloth in the end: Burning the cloth is also the PHYLON midsole, which is a shoe-making technique used to pursue the overall design feeling. The best example is that the shoe midsole and the shoe body are the same. The kind of cloth realizes the overall combination of the shoe body and the sole. To achieve this process, the PHYLON midsole that has been molded is wrapped in the selected fabric and burned in a mold.
(4) PVC midsole: PVC is polyvinyl chloride, which is a kind of artificial leather. It is the earliest invention for the replacement of leather fabrics. It is made by compounding PVC with plasticizer and other additives on the cloth. PVC has low impact strength, large heat distortion, and less elasticity than PU.
(5) PU midsole: In addition to the PHYLON midsole and EVA midsole, PU midsole is also very common. The PU name is polyurethane, a high-density, durable material based on foam rubber that is often used in the midsole of the posterior palm. It acts as a shock absorber. The biggest advantage of the PU midsole is better elasticity and resilience.
(6) The middle of the package: The middle of the package is composed of two parts: the big sole and the upper, but the structure is composed of a big bottom, a midsole, and an upper, but the midsole is wrapped in the upper. Inside.
(7) PU overall sole: PU sole is a low-temperature molded sole. The bottom of PU is light, but it is not suitable to touch water. After encountering water, a chemical reaction occurs and the layers are eroded away.
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