Material Drying
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PA66 and PBT selection
Problem Phenomenon
Electronic connector dimensions become unstable after switching from PBT to PA66
Cause Analysis
PBT moisture absorption is far lower than PA66 and dimensional stability is good; PA66 moisture absorption expansion causes precision mating fit drift; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blindly adjusting the machine based only on experience
Solution
Prioritize PBT or low moisture absorption nylon for precision electronic parts; use PA66 where mechanical strength is the priority; after adjustment, take continuous samples to verify the effect, confirm stability before resuming mass production
Key Takeaway
PBT is superior for electronic precision parts, PA66 is superior for mechanical parts; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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