Material Drying
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LCP Insufficient Drying Surface Silver Streaks
Fenómeno do problema
Silver streak defects appear on the product surface, worsening in humid seasons or after opened packaging is left for a long time.
Análise das causas
Although LCP moisture absorption at room temperature is extremely low, moisture attached to the pellet surface hydrolyzes the polymer at the 330℃ processing temperature to produce defects; some grades are more sensitive to moisture.
Solução
①Dehumidifying drying at 140~160℃ for 4 hours; ②moisture content target <0.01% (stricter than most engineering plastics); ③use promptly after opening or store sealed; ④confirm drying requirements according to the grade data sheet.
Conclusão principal
The LCP drying target of 0.01% is the strictest level among engineering plastics; the drying process must not be omitted because of low moisture absorption.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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