The process includes basic processes such as mastication, mixing, calendering or extrusion, forming and vulcanization. Each process has different requirements for the products, and is combined with a number of auxiliary operations. In order to be able to add various required compounding agents to the rubber, the raw rubber first needs to be plasticized to improve its plasticity; then the carbon black and various rubber additives and rubber are uniformly mixed into a rubber compound by kneading; the rubber material is pressed. The blank is formed into a certain shape; and then combined with the calcined or glued textile material (or metal material) to form a semi-finished product; finally, the vulcanized and semi-finished plastic product is made into a highly elastic final product. .
For products with high precision requirements, oil seals, O-rings, seals and other rubber products, trimming and deburring are also required. The optional methods include manual trimming, mechanical trimming and freezing trimming.
Artificial trimming: labor intensity, low efficiency, and low pass rate.
Mechanical trimming: mainly punching, grinding wheel grinding and round knife trimming, suitable for specific products with low precision requirements.
Freezing Trimming: The special freezing trimming machine is based on the principle that liquid nitrogen (LN2) is used to make the finished burrs brittle at low temperatures, and specific frozen particles (projectiles) are used to hit the burrs to quickly remove the burrs. The high efficiency, low cost and wide range of products for freezing and trimming have become the mainstream process standard.
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