Processing Machinery
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POM screw speed too fast overheating
Fenómeno do problema
Bubbles and discoloration appear in products, the measured melt temperature is significantly higher than the barrel set temperature, and the temperature difference shrinks after reducing the screw speed.
Análise das causas
Excessive screw speed produces excessive shear heat, causing the actual melt temperature to exceed the set value; POM is sensitive to shear heat and very easily triggers decomposition at high speeds.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solução
①Control screw speed at a medium-low speed of 50~100r/min; ②calibrate the process with actual melt temperature measurement; ③optimize overall in coordination with back pressure; ④avoid blindly increasing speed to chase cycle time.
Conclusão principal
Shear heat is an invisible variable in POM temperature control; although medium-low speed plasticizes slightly slower, it brings melt temperature stability and reduced degradation risk, with better overall benefit.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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