Material Drying
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PSU Extrusion Silver Streaks, Bubbles and Drying Level
Fenómeno del problema
[Problem Phenomenon] PSU extruded profiles show severe bubbling and flow marks; drying qualified under '2079851475616104452 process is still insufficient
Análisis de la causa
Extrusion is more sensitive to moisture: the official requirement for extrusion moisture content is <0.01% (100ppm), 5 times stricter than '2079851475616104452 0.05%; wet material extrusion produces severe bubbles and flow marks
Solución
Dry and accept at 0.01% moisture content before extrusion; hopper drying with insulation to prevent moisture regain; cross-section inspection of first profile article for internal bubbles; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusión clave
Extrusion moisture 0.01% is 1/5 of '2079851475616104452; drying level must be upgraded; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence
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