Molding Process
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Improper PSU Back Pressure Setting
Fenómeno del problema
Excessively high PSU back pressure causes increased shear heat and degradation; too low back pressure causes bubbles, internal shrinkage and insufficient compactness in products; the parameter is hard to grasp.
Análisis de la causa
PSU back pressure is recommended to be adjusted within the 3~10 range; too high increases shear heat and triggers degradation; too low causes insufficient melt compactness and poor gas discharge; back pressure and rotation speed must be linked.
Solución
①Adjust back pressure within the 3~10 range according to product requirements; ②If too high, lower back pressure to prevent shear heat; ③If too low, raise back pressure to improve compactness; ④Debug in linkage with screw rotation speed.
Conclusión clave
The 3~10 window for PSU back pressure is clear supplier guidance; failure modes in both directions must be prevented; linked debugging is the most efficient.; After confirming effectiveness, solidify the parameters and practices into the work instructions to prevent recurrence
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