Molds & Tooling
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Stress cracking of PET products
Fenómeno del problema
Cracks appear in PET products during storage or use, especially when contacting solvents or under external force.
Análisis de la causa
Excessive residual internal stress generated during molding, mold temperature too low causing molecular chain orientation freezing, wall thickness abrupt change stress concentration.
Solución
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.
Conclusión clave
PET internal stress management needs to be addressed from mold temperature, product design, and post-treatment.
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