Injection Molding
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ASA Flow Mark Ripples
Problem Phenomenon
【Problem Phenomenon】Wavy flow marks on ASA product surface, uneven gloss
Cause Analysis
The melt front cold film breaks to form flow marks; low mold temperature and too slow injection speed causing the front to cool too fast are the main causes; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based only on experience
Solution
Increase mold temperature and melt temperature; increase injection speed; enlarge runner and gate to reduce front cooling; 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 flow marks are the front condensation signal, raising temperature and speed improves; 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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