Processing Machinery
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POM screw compression ratio
Problem Phenomenon
POM plasticization is poor and the melt temperature is uneven
Cause Analysis
The screw compression ratio does not match POM's melting characteristics, and the shear heat distribution is unreasonable; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Select a screw with a compression ratio of 2.0-2.5 for POM; L/D ratio 18-22; replace worn screws in time; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Screw selection must match POM's melting characteristics; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a reference for troubleshooting similar problems in the future
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