Ink Printing vs. UV Printing for Custom Paper Bags
Conventional ink printing and UV printing are frequently confused because both are used for paper bags. They are different processes with different ink chemistry, drying mechanisms and suitable substrates.
Conventional ink printing (offset or screen) uses inks that dry by absorption into the paper or by evaporation. It is well suited to coated and uncoated paper surfaces and is the standard, cost-effective choice for most printed paper bags.
UV printing uses inks that are cured instantly by ultraviolet light. Because the ink does not need to absorb into the substrate, UV printing works well on non-absorbent or coated surfaces such as laminated boards, plastics and some synthetic materials. It is not suitable for every material: on uncoated kraft paper, UV ink may not bond correctly, and the result depends on the substrate, coating and the supplier's equipment.
What this means for your project: state the bag material and coating first, then confirm which printing method the supplier recommends. PINVERO treats ink printing and UV printing as separate processes and confirms applicability during quotation — we do not describe UV printing as universal.