Molding Process
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PPS back pressure control
Fenómeno del problema
Too low back pressure causes unstable metering, too high back pressure causes melt overheating and discoloration, and fiber shearing
Análisis de la causa
PPS back pressure is conventionally 0.1-1.0MPa, can be raised to 2-4MPa when metering is unstable but overheating must be prevented; high back pressure has both shear heat and fiber breakage, a double-edged sword
Solución
①Back pressure conventionally 0.1-1.0MPa; ②gradually increase when metering is abnormal, not exceeding 4MPa; ③when discoloration or embrittlement occurs, first reduce back pressure; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusión clave
PPS back pressure is mainly low, raised as needed; when discoloration and embrittlement occur, back pressure is the first suspect parameter; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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