1. Selection of ink:
Easy to use polyurethane ink (PU ink or TPU ink), compatible with physical properties.
2. Corona treatment on the surface of TPU film
Perform corona treatment on the TPU film to make the dyne value of the TPU film over 38 suitable for printing; the aspiration dyne value is 40-42.
3. Chemical solvent treatment on the surface of TPU film
Chemical solvent treatment on the surface of TPU film, such as wiping, coating, etc.
The higher the ranking of the following solvent effects, the better. DMF>MEK>toluene>ethyl acetate>thana water>alcohol.
4. Selection of the appearance effect of TPU film
Generally speaking, the matte frosted TPU film has a large surface area. Compared with the bright or glossy TPU film, the ink adhesion is good, the color fastness is high, and the printing is easier.
