Material Drying
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Humidity control problem in PEOX water-soluble film production
Fenómeno del problema
PEOX water-soluble film in casting or blown film production shows film roll blocking, sticky film surface, and inability to wind up smoothly, with product scrap rate as high as 30%.
Análisis de la causa
The ambient humidity of the production workshop is too high (RH>60%), and moisture in the air is absorbed by PEOX causing surface plasticization and stickiness; insufficient film cooling or cooling roll temperature too high (<15°C); improper PEOX grade selection (molecular weight too low makes it easier to absorb moisture and become sticky).
Solución
Control dehumidification of the production workshop to RH<40%, and locally enclose the casting/blown film area for purification and dehumidification; improve film cooling efficiency (cooling roll temperature 5-10°C); select high molecular weight grades (Mv>1,000,000 g/mol) to reduce moisture absorption; store film rolls in sealed packaging with built-in desiccant.
Conclusión clave
PEOX water-soluble film production must be carried out in a strictly dehumidified environment; humidity control is the lifeline of product quality.
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