Material Analysis
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Low EVOH Elongation at Break
Problem Phenomenon
EVOH product elongation at break <100%, below the 200% requirement
Cause Analysis
EVOH molecular weight too low, chains short with insufficient entanglement; orientation excessive, transverse elongation extremely low; crosslinking excessive restricting chain slippage
Solution
1) Select high molecular weight EVOH to increase entanglement density; 2) Reduce orientation by lowering 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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