Molds & Tooling
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POM mold poor venting burn marks
Fenómeno del problema
Burn marks and short fill appear at fixed positions on the product, the corresponding mold area has no venting design, and the defects are eliminated after adding vent grooves.
Análisis de la causa
POM fills quickly, and the cavity gas has no time to escape and is compressed and heated, burning the melt; weld lines and last-fill areas are high-incidence locations for trapped air.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solución
①Open vent grooves at weld lines and ends; ②set venting on the parting line and clean it regularly; ③reduce injection speed to assist venting; ④check the venting effect of ejector pin clearance.
Conclusión clave
Venting is a mandatory requirement in POM mold design; burn mark positions are the indication points for adding venting, and venting adequacy should be verified first when trying a new mold.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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