Material Drying
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PET crystallization for anti-sticking
Problem Phenomenon
Amorphous PET pellets stick and agglomerate after being heated in the drying tower, blocking the feed opening and stopping production
Cause Analysis
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
Solution
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
Key Takeaway
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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