Features and Application of water-based ink, we should pay attention to the problem - printing ink, flexo - Printing Industry

Features and Application of water-based ink, we should pay attention to the problem - printing ink

, flexo - Printing Industry

Flexo is a flexible, high resolution, can warp the relief. In recent years, flexo in Print Areas of rapid development, and its prospects are generally good. Flexo printing press through the unique Anilox roller The right amount of ink transferred to the substrate. The proper use of ink is directly related to print production operation and print quality, general use flexible printing ink is thin, is Liquid ink, from the rheological point of view is close to Newtonian fluid ink, with very good fluidity, viscosity is only 0.1-1Pa / s. Currently the main use flexible printing ink of three types: organic solvent ink, water-based ink and UV curing inks. One of its water-based ink Environmental protection , Economy has been soft, etc account for a large amount of printing. Here mainly on water-based flexo ink printability and its use in a simple study.

1, the composition and characteristics of water-based ink

Same general form as printing inks, water-based ink is usually a coloring agent, binders, auxiliary agent ingredients. Stain is water-based ink coloring material, to a specific color ink. For so imprinted in the flexo color is gorgeous, the coloring agent is generally used in chemical stability, high tinting strength pigments; link to material from the water, resin, amine compounds and other organic solvents. Resin as water-based ink of the most important component, usually water-soluble acrylic resin, binders for ink adhesion components directly affect the function of drying rate, anti-sticking properties and so dirty, but also affect the ink gloss and ink transfer, amines mainly to maintain an alkaline PH value of water-based ink, makes acrylic resin to provide a better printing results, water or other organic solvent soluble resin mainly to regulate the ink's viscosity and drying rate; auxiliary agents mainly include: defoamer blockers, stabilizing agent, diluting agent of several. As the water-based ink is a kind of soap compositions, the use of easy to produce bubbles, so to join the silicone oil as antifoaming agent, to suppress and eliminate air bubbles, while improving the ink transfer performance. Blockers for the inhibition of water-based ink drying speed, to prevent ink drying on the anilox roller to reduce the paste version. Stabilizer can adjust the PH value of ink can also be made thinner to reduce the viscosity of ink. Diluent is used to reduce the appearance of water-based ink colors, light as an agent can improve the brightness of water-based ink. Another water-based ink also add some wax to increase its wear resistance.

Second, the PH value of water-based ink

PH value of water-based ink water-based ink is directly related to the viscosity, drying and so Printability. Experimental results show that the viscosity of water-based ink with PH value decreases linearly increased with the drying of PH value gradually rises linearly. The PH value of water-based ink amines rely mainly on the maintenance of the printing process of the volatile amines, so PH was decreased, which led to increased ink viscosity, metastatic poor, dry faster, plug the roller, paste version failure occurs. Therefore, to maintain the PH value of water-based ink stability on the one hand to avoid leakage of amines, such as cover ink tank cover. On the other hand to add time quantitative stabilizer. PH value of water-based inks generally should be maintained at between 8.0-9.5, PH value of all low impact high quality printing, PH value is too low, the impact of printing performance of acrylic resin to play; PH value is too high, the ink is slow drying , printed materials prone to dirt and water resistance of adhesive on the back of worse problems.

Three issues in the use of water-based ink

Ink dry before the water can be mixed with water, once ink dries, then no longer soluble in water and ink. Therefore, before using water-based ink to be sufficient mixing to maintain uniform ink composition. The ink, the ink tank contains impurities such as remaining ink should be first filtered, which together with the new ink to use. Do not let the time of printing ink to dry on the roller, so as not to dwell hole to plug. Obstruction caused by the printing ink quantitative transmission instability. Flexible in the printing process is to always maintain a wet ink to prevent ink drying on the plate after the text block design. We also found that when water-based ink viscosity slightly, not casual water, so as not to affect the stability of ink can be added to adjust the amount of stabilizing agent.

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