Processing Machinery
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LLDPE shrinkage out of tolerance
Fenómeno do problema
Large dimensional deviation of LLDPE products
Análise das causas
LLDPE shrinkage rate is 1.5-3%, and process fluctuations transmit to dimensions; 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
Solução
Lock cooling and holding pressure; correct the mold based on measured shrinkage; SPC monitoring; 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
Conclusão principal
Dimensional management relies on process 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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