Water-based flexible ink use troubleshooting

Water-based ink is an ink system with environmental protection as its starting point in the 1980s. The initial use of maleic acid modified rosin as a base material, together with a certain amount of alcohol solvents and appropriate additives, to adjust the drying performance and printability, the first to be promoted as the preferred ink type in corrugated boxes . So far, the ink system has been developed into high, medium and low grades to meet the requirements of customers at different levels of printing. Water-based ink as a new ink system adapted to environmental protection requirements has gradually gained more attention in the fields of plastic ink printing, paper embossing ink, paper glue, and lead printing. Now, taking the water-based corrugated box ink as an example, it explains the common faults in printing and how to eliminate it. for reference.

Any failure of the ink printing process generally involves the following five aspects:

a, ink; b, printing substrate (cardboard); c, printer; d, the printer's operation of the ink (dispatch); e, printing environment (temperature, humidity).
analyse as below;

First, light color.

If the printed product is lighter than the sample, consider the following reasons: 1. The ink color is not enough. Solution: Replace the ink with high color density. 2, ink adhesion is too poor, too little transfer. Increase ink viscosity. 3, paper permeability is too strong, it looks light ink. Choose good face paper or solid ink. 4, the ink is adjusted too thin, resulting in light color. Inject new ink to increase the concentration.

Second, poor gloss

1, the ink itself is poor gloss replacement gloss good ink 2, ink over dilution. Reduce the amount of diluent 3, paper permeability is too strong, use a good paper or adjust the ink solid content.
4. The amount of ink transferred on the printer is too small. Increase the transfer of ink

Third, sticky

1. Dryness of ink is too fast, its dryness is adjusted 2, ink viscosity is too high, viscosity is reduced

Fourth, Shui Wen

1, the leveling of the ink is not good, to improve its leveling 2, the surface of the paper is too smooth, use a good paper or alternative ink 3, the pressure of the press roller is too large, adjust the press pressure

V. Fisheye

The reason is that the amount of some additives in the ink is too large to adjust the amount of additives.

Sixth, India side shadow

1, the ink is too thick, adjust the ink printing viscosity 2, pressure roller pressure is too large, properly adjust the pressure

Seven, printed edge incomplete

1, the ink is drying too fast, adjust its dryness 2, the pressure of the pressure roller is too small, adjust its pressure

Eight, ink does not dry

1. The dryness of the ink is poorly transferred into the dry fast solvent 2. The ink transfer amount is too much, the printing layer is too thick, and the ink is thinned.

Nine, the bubble is too large

The amount of ink defoaming aid is not suitable. Add an appropriate defoamer

Ten, big smell

The ink contains more ammonia and a more odorous solvent. Subtract ammonia and odor from the ink to control the amount of ammonia.

In short, the printing process must be carried out smoothly. To achieve good printing results, adjustments must be made to printing materials, inks, paper, printers and operations, and the printing environment, so that they can be combined in the best possible conditions to achieve their goals.