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What is UV DTF Digital Printing film “fogging”?
“Fogging” refers to a hazy, dull appearance on the pattern surface, resulting in colors that are not bright, transparent, or vivid.
Specifically, it manifests as: A grayish tinge after applying a white ink base, not pure white; Colored areas appear as if a matte, frosted layer has added, making the overall image darker. Under light, the pattern surface reflects light unevenly, like a slight oily haze layer.
Common Causes
- Insufficient transparency or uneven fogging coating of the A-film
This causes the overall pattern to appear grayish, affecting color purity; it also affects the light transmittance of the varnish layer, making it look like there’s a “blurred white layer.”
- Poor compatibility of the A-film coating, leading to uneven UV DTF Digital Printing ink spreading; Ink “drips” or “beads,” forming uneven color blocks. After printing, the UV-cured surface has a strong particle-like feel, resulting in a blurry visual appearance.
- Unstable release force of the B-film, resulting in fuzzy edges or localized residue after transfer. The pattern edges are not neat, with slight curling. The pattern may be stretched and deformed during the film removal process. Besides the film itself, common causes include:
- Slanted inkjet nozzle or offset ink ejection angle, leading to pattern atomization and diffusion. The inkjet trajectory is skewed, causing pattern edge diffusion or double images. White ink or varnish edges are blurry, and transparent areas appear gray; this is commonly caused by nozzle impact, assembly tilt, or microparticles clogging the channels.
How to judge the quality of the UV DTF Printing film?
These test indicators: Printed pattern contrast: strong white and black contrast, good film light transmission. Layer integrity after scraping: no blurred edges, no powder shedding, no fogging. But UV lamp irradiation test: high-quality film absorbs heat evenly, without deformation or fogging. Color reproduction after transfer: the quality of the film has a significant impact on the final pattern reproduction.
