Molds & Tooling
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POM Vent Groove 0.013-0.025mm
Problem Phenomenon
Burnt and trapped gas at the part end; after deepening the vent groove, the low-viscosity melt produces flash
Cause Analysis
POM needs venting to let formaldehyde vapor escape to prevent burning, with recommended vent depth at the 0.013mm level; but the melt flows well, so overly deep vents cause flash—the window is extremely narrow
Solution
①Control vent groove depth at 0.013-0.025mm; ②provide vents at runner ends and the parting line; ③regularly clean vent grooves to prevent mold deposit blockage; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
POM venting is a tightrope walk between deep and shallow; 0.013mm-level precision plus regular cleaning can take care of both ends; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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