Extrusion & Post
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PPO Post-Annealing Deformation
Problem Phenomenon
PPO products warp and deform after annealing to eliminate internal stress, dimensions change, and the yield rate decreases.
Cause Analysis
Excessively high annealing temperature or too fast heating causes products to release stress and deform without constraint; PPO's high Tg characteristic requires the annealing temperature to be close to but not exceed the safety boundary; improper clamping method.
Solution
①Annealing temperature below the heat deformation safety boundary; ②gradient heating and cooling; ③clamp and fix products during annealing; ④verify dimensions of the first piece after annealing.; After adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
PPO annealing is a necessary means of stress management but must be standardized; clamping and fixing balances release and shape; temperature gradient control avoids thermal shock.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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