Molds & Tooling
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GPPS Product Sink Marks
Problem Phenomenon
Depressions appear on the back of thick walls and rib positions.
Cause Analysis
Shrinkage at uneven wall thickness is not compensated; insufficient holding pressure or early gate freezing aggravates sink marks.; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solution
①Increase holding pressure and time; ②core out thick areas; ③enlarge gates; ④optimize wall thickness design.; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
GPPS sink marks follow the feeding mechanism; structural uniformity is the fundamental 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 similar problems in the future
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