Material Drying
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Brittle Fracture of LCP Products
Fenómeno do problema
【Problem Phenomenon】LCP parts develop brittle cracking during demolding or use, with flat fracture surfaces, mostly occurring at weld lines or sudden thickness changes
Análise das causas
LCP itself is a rigid rod-like molecule with inherently low elongation at break; brittleness worsens when excessive shear degradation, hydrolysis from insufficient drying, or weld line orientation are superimposed; Celanese troubleshooting lists brittleness as the first item and associates it with degradation and weld lines
Solução
Control the melt temperature not to exceed the upper limit and reduce the shear rate; ensure thorough drying; structurally avoid sudden thickness changes and sharp corners, keep weld lines away from stressed areas, and select a toughened grade if necessary
Conclusão principal
For LCP brittle fracture, the three factors of degradation, hydrolysis and orientation must be investigated 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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