Molding Process
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LCP Sink Marks and Internal Voids
Problem Phenomenon
【Problem Phenomenon】Sink marks appear on the back of thick-wall rib or boss positions of LCP, and internal shrinkage cavities are visible upon sectioning
Cause Analysis
When thick-wall areas cool and shrink, holding pressure compensation is insufficient, and rapid crystallization seals the compensation channel prematurely, causing surface collapse or internal voids; Celanese troubleshooting lists a special item on sink marks and voids
Solution
Extend holding and increase holding pressure, and confirm the gate freeze time; strengthen cooling in thick-wall areas or design material reduction; control rib thickness to a reasonable proportion of the main wall thickness; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
LCP's compensation window is short; holding settings and wall thickness uniformity must be optimized simultaneously; after confirming effectiveness, solidify 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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