Material Analysis
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Low elongation at break of PU
Problem Phenomenon
PU product elongation at break <100%, below the 200% requirement
Cause Analysis
PU molecular weight too low, chains short, insufficient entanglement; excessive orientation, transverse elongation extremely low; excessive crosslinking restricting chain slippage
Solution
1) Select high molecular weight PU to increase entanglement density; 2) Reduce orientation, lower injection speed; 3) Control crosslinking degree to avoid excess
Key Takeaway
Low elongation at break is caused by low molecular weight and orientation; selecting high MW and reducing orientation are key
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