Injection Molding
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ABS burnt marks at flow end
Fenómeno del problema
ABS burnt marks at flow end, trapped gas adiabatic compression, speed and vent adjustment.
Análisis de la causa
ABS burnt marks at flow end; air trapped gas adiabatic compression high temperature; injection speed too fast; poor venting; end converging area; recurrence after machine cleaning.; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blind machine adjustment based solely on experience
Solución
①Injection speed reduced in 10% steps; ②vent 0.025-0.05mm; ③end venting; ④machine cleaning; ⑤recurrence monitoring.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusión clave
Speed and venting of ABS burnt are the adjustment directions; 10% steps are a fine method; the end is the key area.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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