Extrusion & Post
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Dimensional changes of PET injection molded products at high temperature
Problem Phenomenon
PET products show obvious dimensional changes in 80-100°C service environments, causing assembly failure.
Cause Analysis
Fast cooling during '2079851475616104452 makes crystallization incomplete; post-crystallization at high temperature causes volume shrinkage; annealing is insufficient and mold temperature is on the low side.
Solution
Increase mold temperature to promote full crystallization; fully anneal at 130-140°C/1-2h; select PET grades with high crystallization rate.
Key Takeaway
The high-temperature dimensional stability of PET products depends on sufficient crystallinity.
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