Molds & Tooling
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PETG screw cleaning incomplete, cross-contamination
Problem Phenomenon
Cross-contamination occurs when switching from other materials to PETG, with variegated spots or foreign matter in the products.
Cause Analysis
The previous material has residue in the screw, barrel and nozzle, the purging compound amount or time is insufficient, and the temperature switchover is not in place.
Solution
Use a dedicated purging compound to fully clean, not less than 3 times the barrel capacity; raise and lower temperature in stages; disassemble the nozzle to clean dead corners.
Key Takeaway
PETG product changeover requires strict cleaning procedures, especially for transparent products.
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