Processing Machinery
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EVA foaming decomposition temperature management
Problem Phenomenon
Premature foaming or insufficient foaming during the foaming process.
Cause Analysis
The decomposition temperature of AC foaming agent is 160~200°C; if the processing temperature reaches the decomposition point too early, premature foaming occurs; if the temperature is insufficient, foaming is inadequate.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone
Solution
①Control the temperature below the decomposition point in the mixing stage; ②accurately control the temperature in the in-mold foaming stage; ③monitor the actual temperature curve; ④set the process according to the characteristics of the foaming agent.
Key Takeaway
Foaming timing relies on precise temperature management; the temperature division of labor between the mixing and foaming stages must be clear.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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