Molding Process
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EVA compression set is large
Problem Phenomenon
EVA product compression set >30%, below the 15% requirement
Cause Analysis
EVA elastic recovery insufficient; crosslinking degree too low with unrecoverable plastic deformation; density too low with thin cell walls and poor recovery
Solution
1) Increase crosslinking degree to 60-70% to reduce plastic deformation; 2) Select EVA grades with high elastic recovery; 3) Add reinforcing fillers
Key Takeaway
Large compression set is caused by insufficient crosslinking; increasing crosslinking degree is key
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