Molds & Tooling
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PMMA Weld Lines
Fenómeno del problema
Visible meeting lines on transparent parts, weak strength.
Análisis de la causa
Two melt fronts merge with insufficient temperature and poor venting; transparent part weld lines are both an appearance and a strength problem.
Solución
①Raise melt temperature and mold temperature; ②Venting at the merging; ③Adjust the gate to avoid optical zones and load-bearing zones; ④Increase speed.
Conclusión clave
Weld lines = position design first.
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