Extrusion & Post
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PSU Annealing Process for Stress Relief
Problem Phenomenon
[Problem Phenomenon] PSU precision parts show dimensional drift and crazing in solvent environments; no annealing treatment was performed
Cause Analysis
Annealing can improve PSU physical aging and solvent crazing and reduce molding internal stress; a 150°C×2-4h annealing procedure is recommended; hot mold molding can also reduce internal stress
Solution
Anneal products at 150°C×2-4h after demolding and cool slowly; use hot molds during molding to reduce stress generation; annealing is mandatory before plating and bonding; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
150°C×2-4h annealing is a standard action for PSU stress management and cannot be omitted; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence
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