Molds & Tooling
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PC/ABS sink mark
Problem Phenomenon
Depression at thick-walled rib positions.
Cause Analysis
Insufficient holding pressure or uneven wall thickness; gate freezes early and shrinkage compensation is interrupted.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone; this mechanism has been repeatedly verified by industry data and should be confirmed first during troubleshooting
Solution
①Increase holding pressure and time; ②core out thick areas; ③enlarge the gate; ④uniform wall thickness.; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Sink marks follow the shrinkage compensation mechanism; structural design is fundamental.; 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 similar problems later
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