Material Drying
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PESU Insufficient Drying Temperature and Time
Fenómeno del problema
PESU drying temperature below 135℃ or insufficient time; drying efficiency is low and moisture content does not meet the standard.
Análisis de la causa
Drying PESU below 135℃ is not recommended because the time is too long; drying conditions are minimum requirements and over-drying is not allowed; at 135℃ it can be stored for a week without harm; hopper drying requires heat preservation and sealing; the inlet air temperature keeps the pellets at least 135℃.
Solución
①Drying temperature not lower than 135℃; ②adjust time according to the temperature level; ③hopper heat preservation and sealing; ④monitor inlet air temperature and dew point; ⑤extend drying time in high-humidity weather.
Conclusión clave
The 135℃ lower limit of PESU drying is an efficiency guarantee; not allowing over-drying is a material characteristic; the influence of ambient humidity must be compensated.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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