There are always some bubbles on the surface of the sample after vulcanization of rubber, with different sizes. After cutting, there are also a few bubbles in the middle of the sample.
Analysis of the causes of bubbles on the surface of rubber products:
1. The rubber mixing is uneven, and the operators are not standardized.
2. The rubber film is not parked properly and the environment is unsanitary. Management is not standardized.
3. The material has moisture (add some calcium oxide when mixing)
4. The vulcanization is insufficient, and it looks like there are bubbles when it is not cooked.
5. Insufficient vulcanization pressure.
6. There are many impurities in the vulcanizing agent, the impurities of small molecules become decomposed in advance, and the bubbles remain in the product
7. The exhaust design of the mold itself is unreasonable, and the gas cannot be discharged in time when the rubber material is punched!
8. The product is too thick, the rubber material is too small, the heat transfer of the rubber is slow, and after the surface is vulcanized, the fluidity of the rubber decreases, resulting in a shortage of material, so air bubbles may be generated.
9. The exhaust gas was not discharged properly during the vulcanization process.
10. For formula problems, the vulcanization system should be improved.
Solution: Improve vulcanization pressure and time
1. Extend the vulcanization time or increase the vulcanization speed.
2. Thin pass several times before vulcanization.
3. Exhaust more times during vulcanization.
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