Analysis of white ink covering power in waterborne flexo printing

Water-based inks are especially suitable for packaging and printing products that require strict hygiene conditions such as tobacco, wine, food, beverages, and pharmaceuticals, and are important to food safety. White ink is a commonly used ink in packaging and printing. It is mainly used as a primer ink, which needs to cover the color of the underlying ink, and has better reproducibility to the surface ink. Therefore, the performance requirements for self-inking are very strict, especially the hiding power. In actual printing, the covering power of white ink is often not enough, which causes a key problem in printing. Therefore, it is of great significance to study the hiding power of white ink. To study the hiding power of ink, first understand the main factors that affect the hiding power of ink, such as: ink color concentration, ink layer thickness, pigment dispersion, etc. Integrating the influencing factors of all parties, this subject starts from the ink dispersibility, and studies the influence of ink dispersibility on its hiding power.