Processing Machinery
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PBT product dimensional drift after shrinkage
Problem Phenomenon
Dimensions continue to become smaller after storage.
Cause Analysis
PBT post-crystallization shrinkage continues; high-temperature environment accelerates it.; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry data and should be confirmed first when troubleshooting
Solution
①Inspect after aging; ②reserve allowance in the mold; ③evaluate use temperature; ④thermal aging verification.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Post-shrinkage is an inherent behavior of crystalline materials.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems in the future
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