Molding Process
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EVA foam open cell content is high
Problem Phenomenon
EVA foam open cells >30%, exceeding 10%
Cause Analysis
Foaming temperature too high with thin cell walls rupturing into open cells; insufficient crosslinking with low wall strength
Solution
1) Reduce temperature by 5-10°C to reduce wall rupture; 2) DCP 0.5-0.8wt% to increase wall strength; 3) Appropriately reduce AC to reduce gas pressure impact
Key Takeaway
High open cell content is caused by cell wall rupture; temperature control and moderate crosslinking are key
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