Processing Machinery
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HDPE equipment screw
Problem Phenomenon
HDPE plasticization is uneven, unmelted particles appear in the product, and back pressure adjustment has limited effect
Cause Analysis
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
Solution
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
Key Takeaway
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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