Extrusion & Post
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PETG recycled pelletizing pellet yellowing
Problem Phenomenon
After PETG scrap is crushed, recycled and re-pelletized, the pellet color obviously yellows.
Cause Analysis
The recycled material undergoes another thermal history during extrusion pelletizing causing thermal degradation and oxidation, and the waste is mixed with impurities or contaminants.
Solution
Control recycling pelletizing temperature at 220-240°C; fully clean the waste to remove contaminants; add antioxidant during pelletizing.
Key Takeaway
PETG recycling pelletizing color control requires lowering temperature and adding stabilizers.
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