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1, mould structure: complex product model parting line is too little, the gas is not easy to run out, the mould does not run the rubber groove or run the rubber groove size is too small, there is no exhaust hole or exhaust hole external inappropriate, can produce nest gas or bubbles.
2, rubber formula: in the formula design, due to ill-considered, so that the chemical reaction between the matching agent and produce bubbles, in a certain vulcanisation temperature, the rubber itself decomposed gas or low volatile matter overflow. In addition, moisture inside and on the surface of the compound may vaporise during vulcanisation and cause air pockets.
3. Moulding process.
Considering the specific gravity and volume of the rubber material, the mass of the semi-finished product is not appropriately larger than the mass of the finished product. The shape of semi-finished products and improper placement in the mould cavity.
When vulcanising, the pressurising speed is too fast and the gas cannot be discharged in time.
Considering the specific gravity and volume of the rubber material, the mass of the semi-finished product is not appropriately larger than the mass of the finished product. The shape of semi-finished products and improper placement in the mould cavity.
When vulcanising, the pressurising speed is too fast and the gas cannot be discharged in time.
