Molds & Tooling
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POM sink marks and voids
Problem Phenomenon
Surface depressions at thick walls or internal voids.
Cause Analysis
POM has large volume shrinkage; after the gate freezes, feeding to the thick-walled core is interrupted; holding pressure transmission is insufficient.
Solution
①Conduct a gate freeze study to determine holding time; ②enlarge the gate; ③reduce material in thick walls; ④increase holding pressure.
Key Takeaway
POM feeding = gate freeze time management.
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