Reasons for surface blistering of rubber joints

Reasons for surface blistering of rubber joints
1. The main reason for blistering of rubber joints is due to some improper operation during the processing, and the length of time when pressing the ball during the production of rubber joints is also the reason for blistering.
2. The plasticity of the rubber material is too low, which can also lead to sphere foaming. Check whether the plasticity of the rubber material meets the standard. It can be plasticized to promote too low plasticity to supplement the mix and increase plasticity and porosity.
3. The mixing temperature is too high and the blowing agent decomposes prematurely. Check if the discharge temperature of the internal mixer is too high, if the roller temperature is too high and if the rubber is scorched. Due to the high mixing temperature, some rubber can be mixed in small quantities. Add foaming agent to handle the goods heavy industry.
4. The products are too thick, the rubber is too little, the rubber is slow to transfer heat, and after the exterior vulcanization, the rubber liquidity decreases, causing the lack of material, so it may produce bubbles. Vulcanization process exhaust did not row well.
5. The vulcanization speed of rubber material is too fast. Adjust the formula. Check whether the critical temperature of vulcanizing agent is close to the decomposition temperature of foaming agent and match each other to make the vulcanization speed match with the foaming speed.
6. More impurities of vulcanizing agent, small molecules of impurities become decomposition in advance, bubble residual products in the mold itself exhaust design is not reasonable, the gas can not be discharged in time when the rubber material punch line.
7. The pressure is too high, exceeding the internal pressure formed by the gas produced by the foaming agent, resulting in insufficient foaming holes; adjust the machine pressure.