Extrusion & Post
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PETG poor adhesion during printing
Problem Phenomenon
The ink adhesion on the PETG product surface is insufficient, easily peeling off or being scratched.
Cause Analysis
PETG surface energy is low (about 30-36mN/m), the surface has mold release agent or oil contamination residue, and the ink system does not match.
Solution
Corona treat the product surface to a dyne value ≥42mN/m; clean with alcohol before printing; select an ink system suitable for polyester.
Key Takeaway
PETG printing adhesion depends on surface treatment and ink matching.
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