Material Analysis
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Low PVA elongation at break
Problem Phenomenon
PVA product elongation at break <100%, below the 200% requirement
Cause Analysis
PVA molecular weight on the low side, short chains, insufficient entanglement; excessive orientation, extremely low transverse elongation; excessive crosslinking limiting chain slippage
Solution
1) Select high molecular weight PVA 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 the key
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