Molds & Tooling
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POM Sink Mark Depression
Fenómeno do problema
Sink mark pits on the part surface, especially obvious behind ribs, still remaining after holding pressure adjustment
Análise das causas
POM's high crystallization shrinkage makes sink mark risk high; insufficient holding pressure, gate position far from thick-walled areas, and excessive mold temperature all aggravate it; behind ribs is a high-incidence location for sink marks; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solução
①Increase injection pressure and screw forward time; ②move the gate to the thick-walled area; ③appropriately lower mold temperature and modify part design to thin the ribs; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Conclusão principal
POM sink mark control prioritizes holding pressure with structure as backstop; gate position and rib design are the fundamental countermeasures on the mold side; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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