Material Drying
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PET crystallization for anti-sticking
Fenómeno del problema
Amorphous PET pellets stick and agglomerate after being heated in the drying tower, blocking the feed opening and stopping production
Análisis de la causa
Amorphous PET has a low glass transition temperature and softens and sticks at the drying temperature; it must first pass through a crystallization tower to make the molecular arrangement orderly and raise the softening point before it can withstand the drying temperature without sticking
Solución
①Amorphous material is first crystallized for 30-90 minutes at a temperature <149℃; ②the crystallization tower stirs to prevent sticking and lumping; ③amorphous materials such as recycled bottle flakes must be crystallized before drying
Conclusión clave
Crystallization is the pre-process of PET drying; drying amorphous material without crystallization will inevitably cause lumping and tower blockage, which is an introductory lesson in recycled PET processing; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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