Processing Machinery
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Shear overheating from PPO screw speed
Fenómeno del problema
After increasing the PPO screw speed, signs of melt overheating and degradation appear, the linear speed exceeds the standard, and the product color and performance change.
Análisis de la causa
The high-viscosity PPO melt generates significant shear heat; the screw linear speed should be controlled at a medium level of about 0.6m/s; excessive speed superimposes shear heat on barrel heating and breaks through the temperature red line.
Solución
①Control the screw speed at a medium speed with a linear speed of about 0.6m/s; ②verify the shear heat level with the actually measured melt temperature; ③use low back pressure to reduce shear superposition; ④reduce speed and purge the machine after overheating.
Conclusión clave
The core of PPO screw management is the linear speed rather than the speed number; 0.6m/s is the industry recommended benchmark; the actually measured melt temperature is the true judge of shear heat.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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