Processing Machinery
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LLDPE holding pressure management
Fenómeno del problema
Sink marks on LLDPE thick-wall parts
Análisis de la causa
Insufficient holding pressure gives inadequate shrinkage compensation; 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
Solución
Increase holding pressure and time; uniform wall thickness; 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
Conclusión clave
Sink marks rely on the holding pressure regime; 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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