Material Drying
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LCP Blister and Surface Bulge Defects
Problem Phenomenon
【Problem Phenomenon】Blister-like bulges appear on the surface of LCP thin-wall electronic parts, more obvious after high temperature
Cause Analysis
Gas or volatiles under the surface layer expand when heated and push up the skin to form blisters; Misumi literature lists blister as a typical LCP defect and associates it with gas generated by insufficient drying and stagnation degradation
Solution
Strengthen drying and shorten the exposure time after drying; lower the melt temperature upper limit and residence time; increase injection speed so that gas is discharged with filling instead of staying under the skin; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
The essence of blister is subcutaneous gas expanding when heated; control both drying and residence time; 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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