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