Injection Molding
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PP Injection Part Sink Mark—Freeze-off Type
Fenómeno del problema
Although the gate is small and holding time is already long, thick walls still have sink marks.
Análisis de la causa
The small gate freezes off early, and holding pressure cannot continue to transmit to thick-wall areas; no matter how long the holding time, it is ineffective.
Solución
①Enlarge the gate to delay freeze-off; ②place the gate near thick-wall areas; ③reduce material at thick walls; ④auxiliary gates if necessary.
Conclusión clave
Holding after freeze-off = ineffective feeding—the gate is the key.
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