Molds & Tooling
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LCP Dimensional Anisotropy Out of Tolerance
Problem Phenomenon
Products produced in the same mold with different gate positions have different dimensions, and parts qualified in single-axis measurement are out of tolerance when measured in another direction.
Cause Analysis
LCP shrinkage is near zero in the flow direction while transverse shrinkage is significant; a single average shrinkage cannot predict dimensions in all directions, and different gate positions in the cavity produce different orientation patterns.
Solution
①Design cavity dimensions differentiated by direction; ②perform full-direction dimensional verification on first article; ③fix gate position and process; ④use mold flow analysis to assist in predicting dimensions in each direction.
Key Takeaway
LCP mold shrinkage allowance must be directional; full-direction first article inspection is the standard process for LCP mold acceptance.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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