Processing Machinery
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PETG product black or dark lines
Problem Phenomenon
Black or dark linear stripes appear inside the product.
Cause Analysis
The barrel or screw has carbon deposits falling off and mixing into the melt, and a certain temperature zone overheats causing local degradation.
Solution
Clean the barrel and screw to remove carbon deposits; check the accuracy of each temperature zone; use purging compound for regular machine cleaning.
Key Takeaway
PETG black lines point to carbon deposits or local degradation.
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