Processing Machinery
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PLA Screw Selection
Fenómeno del problema
Using a polyolefin extruder near maximum power to process PLA, torque is insufficient and plasticization is poor
Análisis de la causa
PLA recommends a general-purpose screw with L/D 24-30 and compression ratio 2-3; polyolefin extruders running near maximum power have insufficient torque reserve; polyester or PS extruders are more suitable
Solución
①Select an L/D24-30, compression ratio 2-3 general-purpose screw; ②Use a polyester or PS type extruder; ③Avoid running the equipment at the full-load boundary; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Conclusión clave
PLA screw selection follows polyester; L/D24-30 plus compression ratio 2-3 is the standard configuration, and torque reserve must be sufficient; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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