Injection Molding
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POE '2079851475616104452 sink marks
Fenómeno del problema
POE injection molded product thick-wall areas show surface depression 0.2-0.5mm sink marks
Análisis de la causa
Holding pressure insufficient or holding time short; gate freezes too early, holding pressure cannot be transmitted; wall thickness difference large, after thin wall freezes the thick wall cannot be refilled
Solución
1) Increase holding pressure 70-90MPa; 2) Extend holding to gate freezing +2s; 3) Product design to reduce wall thickness difference with gradual transition; 4) Add supplementary gates in thick-wall areas
Conclusión clave
Sink marks are caused by insufficient holding and wall thickness difference; high-pressure holding and multiple gates are core countermeasures
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