What is the difference between plastic injection molding and rubber injection molding?

Rubber injection(1)

Plastic is a thermoplastic material. As the name implies, when the temperature exceeds the melting point, the material will melt, and then the material will be driven into the mold cavity using high pressure and cooled to form. There is essentially no difference between the granular plastic particles and the molded products. Rubber can be said to be thermosetting and has no melting point, only an ignition point. It burns above a certain temperature. The process of rubber molding is a vulcanization process and the internal molecular structure changes. It can be roughly understood that many short-chain structures become complex multi-chain structures through cross-linking. The essence has changed.Rubber injection molding machine uses high pressure to drive semi-finished mixed rubber (either solid or liquid) into the mold cavity and then vulcanizes it at a certain temperature and within a certain period. The plastic molding mold is cold, and the rubber molding mold is hot. The difference between the two is very big. The melting point can be used to judge traditional rubber and plastic or thermoplastic elastomers. You put a red-hot needle on the product. If it melts, it is not traditional rubber. Vice versa, it is very likely, but it does not rule out that it is super durable. Warm engineering plastics

Double parting surface

Rubber injection molding is a production method in which rubber is injected directly from the barrel into the model for vulcanization. The advantages of rubber injection molding are: although it is an intermittent operation, the molding cycle is short, the production efficiency is high, the blank preparation process is eliminated, the labor intensity is low, and the product quality is excellent.


Single parting surface





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