Processing Machinery
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HDPE equipment screw
Fenómeno do problema
HDPE plasticization is uneven, unmelted particles appear in the product, and back pressure adjustment has limited effect
Análise das causas
HDPE is suitable for general-purpose screws with a compression ratio of 2.0-3.0; too low a compression ratio causes insufficient plasticization, and too high causes large shear heat; back pressure only needs to ensure melt uniformity, and too high is useless
Solução
①Screw compression ratio 2.0-3.0; ②back pressure at the low limit to ensure uniformity; ③for poor plasticization check screw wear and temperature; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusão principal
HDPE screw selection is lenient but has boundaries; a 2.0-3.0 compression ratio plus low back pressure is the standard configuration; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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