Production & Quality
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EVOH Surface Microcracks
Problem Phenomenon
EVOH product surfaces show 0.05-0.2mm microcracks affecting appearance and strength
Cause Analysis
EVOH product internal stress too large exceeding material yield stress; environmental stress cracking; product design stress concentration
Solution
1) Annealing to release internal stress; 2) Product design to avoid sharp corners and stress concentration; 3) Select high molecular weight EVOH to improve crack resistance
Key Takeaway
Microcracks are caused by excessive internal stress; annealing and crack-resistant design are key
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