Familiar with the characteristics use of additives in printing

The printability of ink is affected by objective conditions such as printing conditions, surface characteristics of the substrate, ambient temperature humidity, storage time. Therefore, when using it, some ink additives need to be fine-tuned to obtain the best printing effect.

Auxiliaries commonly used in water-based inks include colorants, pH stabilizers, slow-drying agents, defoamers, diluents, etc. It is necessary to be familiar with the characteristics methods of the additives during printing.

Let's understand the characteristics usage of these additives together with the editor!

1. The colorant is used to deepen the color, its dosage should be generally controlled at 0-30%. If it exceeds 30%, the content of the connection material in the ink will be too low, resulting in a decrease in adhesion wear resistance.

2. The pH stabilizer is used to adjust control the pH of the water-based ink so that it is stable at 8.0 to 9.5, ensuring the printing state of the water-based ink. At the same time, it can also adjust the viscosity of water-based ink dilute the ink.

3. Slow-drying agent is used to reduce the drying degree of water ink. Slow-drying agent can inhibit slow the drying speed of water-based ink, prevent the ink drying on the printing plate, reduce the occurrence of printing failures such as blocking paste. The amount of slow-drying agent should generally be controlled at 0 to 10% of the total ink amount. If the amount is too much, the ink will dry completely, the printed matter will be dirty smelly.

4. Dilution agent is mainly used to reduce the depth of color, the amount is limited. However, the addition of a large amount of diluent may cause the viscosity of the ink to rise slightly. At this time, a small amount of diluent can be added for adjustment.

5. Dilution is mainly used to reduce the viscosity of the ink, the amount should be controlled within 3%, so as to reduce the color depth of the ink, keep the pH of the ink unchanged. The diluent should be added slowly while stirring to prevent the viscosity being too low. If adding more thinner using high hardness tap water to dilute will produce bubbles, then defoamer should be added.

6. The main cause of foaming problems in the use of water-based inks is that it uses water as a diluent. During emulsion polymerization, a certain amount of emulsifier must be used to greatly reduce the surface tension of the emulsion system.