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