Material Drying
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PET injection-grade drying
Problem Phenomenon
Engineering injection-grade PET is dried at bottle-grade 165℃, and the pellets agglomerate severely
Cause Analysis
Injection-grade PET is mostly amorphous or low-crystallinity chips, and 165℃ is close to its softening point, causing sticking and agglomeration, so the drying temperature must be lowered; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
Injection-grade PET drying temperature 130-140℃ for 4-6 hours; glass fiber reinforced grades follow the supplier's guidelines; agglomerated material is sieved and downgraded for use
Key Takeaway
Drying temperatures differ greatly among PET grades and must be executed according to the grade; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for subsequent similar problems
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