Extrusion & Post
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PLA extrusion melt fracture
Fenómeno do problema
Sharkskin on the extrudate surface.
Análise das causas
Excessive die shear; low temperature aggravates it.; 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 data and should be confirmed first during troubleshooting
Solução
① Increase die temperature; ② widen the gap; ③ reduce speed; ④ optimize the formulation.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Conclusão principal
Melt fracture is shear instability.; 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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