Processing Machinery
2 Aufrufe
PMMA Screw Selection
Problembeschreibung
PMMA plasticization is poor and the melt temperature is uneven
Ursachenanalyse
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
Lösung
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
Wichtigste Erkenntnis
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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