Molds & Tooling
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LLDPE mold temperature effect on shrinkage
Problem Phenomenon
Same mold with different mold temperatures gives different shrinkage
Cause Analysis
Mold temperature affects crystallization and shrinkage; when troubleshooting on site, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solution
Lock mold temperature; measure shrinkage on first piece; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
Shrinkage relies on mold temperature locking; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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