Processing Machinery
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PSU Characteristic of Hard-to-eliminate Internal Stress
Problem Phenomenon
[Problem Phenomenon] PSU products crack after storage; environmental stress cracking test failed
Cause Analysis
PSU melt cools fast and molecular chains are rigid; molding internal stress is difficult to eliminate by itself; residual stress releases and cracks under solvent or load; During on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based solely on experience
Solution
After molding, use hot molds and full annealing to reduce internal stress; avoid contact with polar solvents; for high-stress-risk parts, perform post-annealing solvent immersion verification; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PSU internal stress is inherently hard to eliminate; hot mold plus annealing are standard procedures; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence; Include this case in the defect archive as a reference for troubleshooting similar problems in the future
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