Extrusion & Post
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PLA Melt Viscosity Matching
Problembeschreibung
After switching to PLA grades of different molecular weight, the extrusion pressure and product performance change dramatically
Ursachenanalyse
High molecular weight PLA melt viscosity is 500-1000Pa·s (10-50s⁻¹); '2079851475616104452 grade molecular weight is about 100,000 Da, cast film extrusion grade about 300,000 Da; grade mismatch causes overall process imbalance
Lösung
①Select a grade with molecular weight matching the process; ②'2079851475616104452 about 100,000 Da, cast film about 300,000 Da; ③Re-establish the process window after changing the grade; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Wichtigste Erkenntnis
The molecular weight of a PLA grade is the foundation of the process; if the wrong grade is used for '2079851475616104452 and extrusion, all parameters must be redone; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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