Extrusion & Post
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ASA Extrusion Melt Fracture
Problem Phenomenon
【Problem Phenomenon】After ASA extrusion speed-up, surface sharkskin roughness
Cause Analysis
Die exit shear rate exceeding critical triggers melt fracture; ASA has a speed-up upper limit under medium shear sensitivity; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based only on experience
Solution
Reduce line speed or raise die temperature; die flow channel polishing; processing aid when necessary; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
ASA extrusion sharkskin relies on temperature reduction, speed matching and polishing; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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