Molds & Tooling
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PMMA Vent Groove Depth Improper
Fenómeno do problema
After adding vent grooves, flash appears at product edges, or vent grooves are too shallow and trapped-air burning remains unsolved.
Análise das causas
When vent groove depth exceeds 0.04mm, PMMA melt penetrates to form flash; if depth is less than 0.02mm, venting is poor and the trapped-air problem remains.
Solução
①Control vent groove depth at 0.02~0.04mm; ②densify venting points according to defect locations; ③regularly clean accumulated material in vent grooves; ④verify venting effectiveness.
Conclusão principal
Vent groove depth is a fine parameter of PMMA molds; take the specification range between preventing flash and ensuring venting, and arrange with emphasis at filling ends.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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