Material Drying
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Product bubbles and silver streaks
Fenómeno do problema
Bubbles and silver streaks appear inside and on the surface of PES products
Análise das causas
Insufficient drying with moisture content exceeding the standard (PES requires 150°C/3-4h drying); processing temperature too high exceeding 370°C causing slight decomposition; holding pressure and compaction degree insufficient
Solução
Strictly implement the 150°C/3-4h drying standard; control barrel temperature at 310-370°C; increase holding pressure and time for full compaction
Conclusão principal
PES processing is extremely sensitive to moisture; drying is the first quality control point
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