Processing Machinery
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ASA Sink Mark Thick Wall Rib Positions
Problem Phenomenon
【Problem Phenomenon】Sink marks on ASA thick-walled areas and rib backs, affecting appearance flatness
Cause Analysis
Thick-walled areas cool and shrink with insufficient feeding, surface collapses; ASA shrinkage rate is small but still obvious at sudden wall thickness changes; rib positions designed too thick is the structural inducement; during on-site troubleshooting, verify item by item according to this mechanism, avoid blindly adjusting the machine based only on experience
Solution
Increase holding pressure and time for feeding; rib thickness controlled at 50-60% of main wall thickness; thick areas reduce material or strengthen cooling; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
ASA sink marks check holding pressure first then wall thickness, halving rib thickness is the design solution; 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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