UV printing is fast, high-quality, and environmentally friendly than solvent-based. On top of these advantages, the biggest highlight of UV lithography is the diversification of its printing substrates.UV lithographic printing can achieve high-quality printing effects on glass, ceramics, metal, acrylic, and wood that could not be printed before. However, UV ink dries quickly, and glass, ceramic, metal and acrylic and some smooth wood surfaces, UV ink has poor adhesion and is easy to fall off. Therefore, although many manufacturers promote "uncoated" UV printing, in market applications, especially in industrial applications with higher requirements, using flatbed printer coating to help UV ink adhesion is a necessary process.