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