Injection Molding
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Plasticization fluctuation in PP '2079851475616104452
Fenómeno del problema
The plasticizing time fluctuates between long and short, back pressure and current are unstable, and product quality fluctuates accordingly.
Análisis de la causa
Poor hopper feeding (bridging), a high proportion of regrind or uneven particle size, and excessive hopper temperature cause fluctuation in screw conveying efficiency; screw wear or improper feed zone temperature also causes unstable plasticization.
Solución
①Check the hopper throat cooling to prevent bridging; ②control the proportion and particle size of regrind; ③check the wear of the screw and barrel; ④stabilize drying and feeding; ⑤monitor plasticizing time as an early warning indicator.
Conclusión clave
For unstable PP plasticization, first check 'feeding': bridging and regrind are common culprits; include plasticizing time in process monitoring—it often alarms before the product goes wrong.
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