Material Drying
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PA6 Drying Temperature 80-100°C
Fenómeno do problema
After drying, the pellets turn yellow and oxidize, or with insufficient drying the products still show silver streaks
Análise das causas
Drying temperature below 80°C results in insufficient dehydration efficiency, while above 100°C the PA6 surface oxidizes and discolors; ordinary hot-air drying also brings moisture from humid air back into the pellets, making them wetter the more they are dried
Solução
①Dehumidifying dryer at 80-100°C for 4-8h; ②for oxidation-sensitive natural-colored material, the drying temperature does not exceed 75°C; ③a dehumidifying dryer with a molecular sieve must be used rather than ordinary hot air
Conclusão principal
The key equipment for PA6 drying is the dehumidifying dryer; hot-air drying may be counterproductive in humid seasons, with the temperature upper limit preventing oxidation and the lower limit ensuring efficiency; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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