Injection Molding
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CEF surface tiger stripes
Fenómeno do problema
The surface of the CEF injection molded part has tiger stripes with alternating light and dark stripes, width 2-5mm
Análise das causas
The injection speed is unstable and the melt front fluctuates, sometimes fast and sometimes slow; the mold temperature is low <30°C and the front cools rapidly
Solução
1) Multi-stage injection slow-fast-slow to stabilize the front; 2) Increase the mold temperature to 40-50°C; 3) Increase the injection pressure for stable advancement
Conclusão principal
Tiger stripes are caused by unstable injection front; multi-stage injection and high mold temperature are the key
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