Extrusion & Post
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PETG poor compatibility with inks and coatings, undercutting
Problem Phenomenon
Solvents in inks or coatings erode the PETG surface, producing swelling or cracking.
Cause Analysis
The coating solvent has an erosive effect on PETG, and the interface between the coating and the substrate bonds poorly.
Solution
Select water-based or UV-curable inks and coatings; test the effect of solvents on PETG; pretreat the product surface.
Key Takeaway
PETG coating requires attention to solvent system selection.
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