Processing of rubber products

The processing process of rubber products includes basic processes such as plasticizing, mixing, calendering or extruding, molding and vulcanizing. Each process has different requirements for products, which are supported by several auxiliary operations.

In order to add various required ingredients to the rubber, the raw rubber must first be plasticized to improve its plasticity; Then, carbon black and various rubber additives are uniformly mixed with rubber to form rubber compound through mixing; The rubber is pressed into a blank with a certain shape; Then, it is combined with the calendered and glued textile materials (or metal materials) to form a semi-finished product; Finally, after vulcanization, the plastic semi-finished product is made into a highly elastic final product.

For products with high accuracy requirements, such as oil seals, O-rings, seals and other rubber products, trimming and deburring are also required. The methods available include manual trimming, mechanical trimming and frozen trimming.

Manual trimming: high labor intensity, low efficiency and low qualification rate.

Mechanical trimming: mainly including punching, grinding wheel and round knife trimming, applicable to specific products with low precision requirements.

Freezing trimming: a special freezing trimming machine. Its principle is to use liquid nitrogen (LN2) to make the rough edges of finished products brittle at low temperatures, and use specific frozen particles (bullets) to strike the rough edges to quickly remove the rough edges. Freezing trimming has become the mainstream process standard because of its high efficiency, low cost and wide application.