Flexo printing ink does not occur because a volatile organic solvent, is known as the green printed material. However, flexo ink market share in the soft packaging and printing areas account for only 3% to 5%, but for security reasons the packaging, should vigorously promote flexo ink in flexible packaging, especially packaging of infant supplies, women's cosmetics packaging, Applications in the field of food packaging have placed higher demands on the performance of flexo inks, forcing the industry to develop and use new flexo water-based inks. Additives are one of the important components of flexo inks, which are essential for the performance of flexo inks and for improving the quality of flexo printing. In this paper, the effects of different additives such as wetting agent, leveling agent, defoaming agent, filming aid, wax emulsion and pH adjuster on the performance of film flexographic ink are discussed and discussed.
Effect of wetting agent and leveling agent on the performance of film flexo ink
Films such as BOPP are non-absorbent materials with low surface energy. The film flexo ink has a large surface tension and is not ideal for wetting the film non-absorbent material. Adding a suitable wetting agent and leveling agent to the film flexo ink can reduce the static surface tension and dynamic surface tension of the water-based ink, impart excellent wettability and leveling properties to the ink, and improve the spread of the ink on the film surface. Improve the wetting and leveling effect of the ink film. In addition, when high-speed printing is used, the intermolecular distance between the ink and the film surface is rapidly reduced instantaneously. It is also required to add a suitable and efficient wetting agent and leveling agent with low foaming properties for better and faster wetting. Film surface.
Experiments were carried out with 20 kinds of wetting agents and 10 leveling agents from BYK, TEGO, Corning Chemical (China) Co., Ltd. and Air Chemical Company. The experimental results show that the ink leveling effect of the ink on the surface of the film is best when the amount of the wetting agent W4 (organic silicone) and the leveling agent L5 (organic) of the air chemical company are 0.3% and 0.2%, respectively. The ink film is more delicate, and the ink with the added L5 has the best proofing effect. Fig. 1 is a comparison of ink proofing effects of an ink to which no wetting agent, a leveling agent is added, and a leveling agent L5 added with 0.2% by mass. Figure 2 is a comparison of the addition of 0.2% by mass of leveling agent L5 to a commercially available film flexographic ink sample at the same viscosity (44s, coated 4# cup). It can be seen that under the same viscosity, the proofing effect of the ink added with L5 is better than that of the commercially available film flexo ink.
Effect of Defoamer on the Properties of Film Flexo Ink
Since the film flexo ink contains a foaming surfactant such as a wetting agent, a leveling agent, an emulsifier, etc., excessive bubbles in the ink mixing stage may affect the ink dispersion, and a large amount of bubbles generated in the printing stage may reduce the quality of the printed matter. Therefore, defoamer is an indispensable auxiliary in water-based inks. In the ink dispensing stage of the film flexo ink and during the printing process, the defoaming agent acts to eliminate foam and inhibit foam generation. The defoaming agent not only controls the defoaming speed of the ink distribution and printing stage, but also has good compatibility with the ink system, and does not cause surface defects such as shrinkage of the ink film, orange peel, needle eye, etc., to ensure the smooth progress of the printing process. And print quality.
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