Processing Machinery
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HDPE film melt pressure fluctuation and uneven thickness
Fenómeno del problema
The thickness gauge shows random thickness fluctuation, and the melt pressure gauge reading fluctuates synchronously.
Análisis de la causa
Large fluctuation of melt pressure and temperature makes the extruded melt flow unstable; screw wear or unstable feeding is a common inducement.; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solución
①Check and stabilize the melt temperature; ②repair the screw and feeding system; ③install a melt pump for pressure stabilization if necessary; ④monitor the melt pressure trend.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusión clave
Melt pressure stability determines thickness consistency; the melt pump is the pressure-stabilizing configuration for high-demand occasions.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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