Molds & Tooling
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LCP Warpage and Anisotropic Shrinkage
Problembeschreibung
【Problem Phenomenon】Flat-plate or frame-shaped LCP products warp and deform after demolding; the shrinkage rates differ greatly between the flow direction and the perpendicular direction, and dimensions are inconsistent in the two directions
Ursachenanalyse
LCP rigid molecular chains orient along the flow direction, with extremely small longitudinal shrinkage and large transverse shrinkage; shrinkage anisotropy causes internal stress warpage; the Celanese guide points out that mineral filling can reduce the anisotropy ratio to nearly 1
Lösung
For warpage-sensitive products, select mineral or glass-mineral hybrid filled grades; optimize gate position and number to make orientation symmetric; keep mold temperature uniform and extend holding and cooling, and use a sizing fixture for correction if necessary
Wichtigste Erkenntnis
Anisotropy is the root cause of LCP warpage; selecting a mineral-filled grade plus symmetric orientation is most effective; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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