Processing Machinery
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POM screw selection
Fenómeno do problema
POM production has unstable metering and product weight fluctuations, and the fluctuations intensify when processed with a nylon screw
Análise das causas
POM suits a gradual-transition screw with an L/D ratio of 18:1-20:1; a general-purpose screw with a short compression section causes uneven plasticization, resulting in pulsation and weight fluctuations; a nylon-dedicated screw causes even greater fluctuations when processing POM
Solução
①Select a gradual-transition 18:1-20:1 screw; ②for plasticization abnormalities, first check the screw type match; ③when weight fluctuation is large, verify the condition of the screw and check valve; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Conclusão principal
Screw matching is the hardware foundation of POM process stability; a dedicated gradual-transition screw cures the root cause better than any parameter fine-tuning; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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