EVA is an ethylene-vinyl acetate copolymer referred to as EVA. Compared with polyethylene, EVA reduces the high crystallinity and improves the flexibility, impact resistance and filler compatibility due to the introduction of vinyl acetate monomer in the molecular chain. And heat sealing performance. The EVA midsole refers to the midsole of the shoe that is formed by injecting EVA into the mold and then heated by high temperature. It is also called a foaming midsole. The traditional EVA is hot pressed. The EVA injection machine directly injects the EVA particles into the mold of the machine. After the vacuum is added for about 400 seconds, the mold is opened, the sole of the mold is foamed, and then the hot and cold shaped box is shaped. The big feature is high output, one molding. The disadvantage is that it is easy to deform, and it turns yellow and shrinks over time.
How to identify is EVA shoe material:
1. PU bottom, cut a small piece to ignite, the flame is stable without green edges, and there is melting and dripping.
2, PVC bottom, cut a small piece, ignite the flame beat with green edge, self-extinguishing from the fire.
3, EVA bottom, cut a small piece to ignite, there is a burning smell of candles and melting and dripping.
4, the rubber sole, cut a small piece to ignite, there is a burnt smell of the tire, there is black smoke.
5, TPR bottom, cut a small piece, ignite the flame to beat, the burning part is molten, not extinguished from the fire, soluble in a stupid.
