Processing Machinery
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PMMA Screw Selection
Problem Phenomenon
PMMA plasticization is poor and the melt temperature is uneven
Cause Analysis
An excessively large screw compression ratio causes high shear heat, and PMMA is heat-sensitive and prone to degradation; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience; this mechanism has been repeatedly verified by industry literature and should be confirmed first during troubleshooting
Solution
Select a low compression ratio screw for PMMA (1.8-2.2); moderate L/D ratio; replace worn screws; after adjustment, take samples continuously to verify the effect, and resume mass production only after confirming stability
Key Takeaway
PMMA screws require low-shear design; after confirming effectiveness, solidify 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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