Processing Machinery
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PPS screw speed upper limit
Fenómeno del problema
After increasing screw speed, the product becomes brittle, glass fibers break, and strength decreases instead of rising
Análisis de la causa
PPS screw speed should be 40-100rpm; too high speed causes shear heat to overheat the melt, and shears glass fibers causing loss of reinforcement effect; fiber length retention directly affects mechanical properties
Solución
①Screw speed controlled at 40-100rpm; ②glass fiber grades take low speed to preserve fiber length; ③when strength decreases, first check speed and back pressure; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusión clave
The essence of PPS screw low-speed is fiber preservation; shear heat and fiber breakage are the dual costs of high speed; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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