Extrusion & Post
1 views
PLA extrusion melt fracture
Problem Phenomenon
Sharkskin on the extrudate surface.
Cause Analysis
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
Solution
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
Key Takeaway
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
Was this helpful?
0 people found this helpful
Thank you for your feedback!