Molds & Tooling
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POM nozzle drooling
Problem Phenomenon
Nozzle drooling and stringing contaminate the mold surface, and melt drips during mold opening gaps form impurities
Cause Analysis
POM melt has good fluidity and drools when the nozzle temperature is high or the back pressure is large; long mold opening time aggravates dripping; a stainless steel hot runner with valve gate can radically cure stringing and maintain uniform color
Solution
①Lower the nozzle temperature and back pressure; ②use suck-back after plasticization to prevent drooling and shorten the mold opening time; ③select a stainless steel valve-gate hot runner; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
POM drooling control starts from three lines: temperature, back pressure, and timing; a valve-gate hot runner is the radical solution for high-end parts; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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