Molds & Tooling
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Stress cracking of PET products
Problem Phenomenon
Cracks appear in PET products during storage or use, especially when contacting solvents or under external force.
Cause Analysis
Excessive residual internal stress generated during molding, mold temperature too low causing molecular chain orientation freezing, wall thickness abrupt change stress concentration.
Solution
Increase mold temperature to 130-160°C; product design avoids sharp corners; anneal at 130-140°C for 30-60min after molding; control filling speed.
Key Takeaway
PET internal stress management needs to be addressed from mold temperature, product design, and post-treatment.
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