Extrusion & Post
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Carbonization in PET waste yarn recycling and granulation
Problem Phenomenon
During PET waste yarn recycling and granulation, the material carbonizes and turns black, producing black particles and a burnt smell.
Cause Analysis
The waste yarn contains a large amount of spinning oil agent that degrades and carbonizes at high temperature; extrusion temperature is on the high side; waste yarn bulk density is low and feeding is uneven.
Solution
Pre-wash the waste yarn to remove surface oil agents; use a forced feeding device; reduce extrusion temperature; use a vented extruder.
Key Takeaway
PET waste yarn recycling requires pretreatment to remove oil agents to prevent extrusion degradation.
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