Material Drying
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PPSU drying temperature lower limit
Fenómeno del problema
When PPSU drying temperature is below 135℃, drying time is too long, efficiency is low, and moisture content is difficult to meet standards.
Análisis de la causa
PPSU recommended drying temperature is not lower than 135℃ to avoid excessively long drying time; at 135℃ it can be stored for a week without harm; hopper drying requires heat preservation and sealing; inlet air temperature maintains pellets at least 135℃.
Solución
①Drying temperature ≥135℃; ②time adjusted according to temperature level; ③hopper heat preservation and sealing; ④inlet air temperature monitoring; ⑤extend drying in high-humidity weather.; After adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Conclusión clave
The 135℃ lower limit of PPSU drying is an efficiency guarantee; inability to over-dry is a material characteristic; environmental humidity must be compensated.; After confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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