Molds & Tooling
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PVC Vent Slot 0.01-0.02mm
Fenómeno del problema
Products had burnt and trapped gas at the end, but after deepening the vent the melt overflowed and formed flash
Análisis de la causa
PVC processing continuously releases trace HCl and water vapor; insufficient venting causes trapped gas and burnt; but although the melt viscosity is high there is still flash risk, so vent depth must be precisely controlled at 0.01-0.02mm
Solución
①Vent slot depth 0.01-0.02mm; ②set vents every 15-20mm of flow path; ③regularly clean vent slots to prevent PVC residue clogging; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Conclusión clave
PVC venting is precision work; the 0.01-0.02mm window is combined with dense layout and regular cleaning; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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