Sign materials, Digital printing materials, PVC vinyls - Shanghai Hanker
Poor adhesion of the coating to the surface of the non-absorbent substrate The substrate is a non-absorbent or non-porous substrate (such as PVC or PET film), and the adhesion of the varnish coating to the surface of the substrate may be poor. Soluti...
Fingerprint problem Fingerprints were found on the printed products after glazing, especially when the black ink was glazed. This is because varnish often adds some additives to improve the varnish properties, such as defoamers, leveling agents, etc....
Glazing effect is unstable In the flexographic printing process, in order to stabilize the viscosity of the water-based ink, it is necessary to add a certain amine substance to the ink. Although the viscosity of the ink can be effectively maintained,...
Matte oil concentration is unstable The problem of printing a long version of the work is more prominent. In order to reduce the gloss of UV varnish or water varnish to achieve the matting effect, a large amount of silica needs to be added, which cau...
Adhesive suitability and printability A good varnish coating forms a 100% solid film on the surface of the ink layer. The coating is like a plastic film with a smooth surface. This is very disadvantageous for post-processing such as gluing, and the a...
Poor scratch resistance The UV varnish coating has poor scratch resistance. On the one hand, the coating is too brittle and easily peeled off, which is caused by excessive curing; on the other hand, the ink layer is not completely dried, resulti...
Poor water resistance The general-purpose UV varnish is poor in water resistance because the important components in the UV varnish are hydrophilic, which affects the water resistance of the coating. Solution: There is water-resistant UV varnish...