Material Analysis
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Insufficient EVOH Tensile Strength
Problem Phenomenon
EVOH product tensile strength 15-20% below standard value
Cause Analysis
EVOH molecular weight too low, strength foundation insufficient; filler interface poor, no reinforcing effect; orientation excessive, strong longitudinally and weak transversely
Solution
1) Select high molecular weight EVOH grade; 2) Treat filler with coupling agent to improve interface; 3) Reduce orientation to decrease longitudinal-transverse difference
Key Takeaway
Insufficient tensile strength is caused by molecular weight and poor interface; selecting high MW grade is key
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