Molding Process
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EVA foam locally unfoamed
Problem Phenomenon
EVA foamed shoe material has local hard lumps with density >0.5g/cm³
Cause Analysis
Blowing agent AC locally undecomposed due to insufficient temperature; DCP locally excessive with premature crosslinking suppressing expansion
Solution
1) Mold temperature ±2°C to ensure global decomposition; 2) DCP masterbatch method to ensure uniform crosslinking; 3) AC masterbatch method to ensure dispersion
Key Takeaway
Local unfoamed areas are caused by insufficient temperature and uneven crosslinking; uniform temperature control and masterbatch method are key
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