Injection Molding
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LLDPE '2079851475616104452 sink mark
Fenómeno del problema
Sink marks in thick-wall areas of LLDPE injection molded parts are lighter than LDPE, but holding pressure control is still needed
Análisis de la causa
LLDPE shrinkage 1.5-3% is lower than LDPE, with smaller sink mark tendency; but shrinkage compensation needs in thick-wall areas still exist; holding pressure and time are optimized by wall thickness
Solución
①Set holding pressure at 60-80% of injection pressure; ②thin the structure in thick-wall areas; ③place the gate near thick-wall areas; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusión clave
LLDPE's low shrinkage reduces sink marks; but holding pressure management for thick-wall parts remains a necessary step; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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