8 "taboos" in the use of water-based inks

The eight taboos used in water-based inks, printing must know:

1. In screen printing, pay attention to control the parameters of water-based ink, including the viscosity, fluidity, thixotropy plasticity of the ink.

2. Pay attention to the control index of water-based ink. The control indexes of water-based ink are mainly fineness, viscosity, pH value drying speed, etc., which play a decisive role in the application effect of the ink.

3. Since the water-based ink is a pure water-based system, it is necessary to pay attention to mix the water-based ink with the alcoholic ink the solvent-based ink add organic solvents to the ink to avoid printing quality problems.

4. When using water-based ink, stir it evenly, pour it into the ink tank after measuring the appropriate viscosity, if the viscosity is suitable, you can use thinner thickener to adjust, pay attention to control the pH value of the ink, generally controlled at 8.5 ~ 9.5. During the printing process, due to the volatilization of water, the viscosity of the ink will increase the pH value will decrease. Therefore, you should always observe the use of the ink find that when the viscosity of the ink increases the pH exceeds the control range, you should use diluent pH stabilizer in time. Adjust to ensure the stability of viscosity pH.

5. In general, ink is very suitable for high-speed printing. If low-speed printing encounters a situation the drying speed is too fast the printing effect is good, a certain proportion of slow-drying agent can be added.

6. After printing, the remaining ink should be returned to the corresponding original barrel the cover of the ink tank should be tightly closed for the next use. Prevent condensate, thickening even drying due to ink surface. Water-based ink should be stored in a ventilated cool room at room temperature controlled at 5 ~ 45 ℃.

7. The ink remaining on the printing equipment after printing can be rinsed with clean water when it is completely dry, the ink that cannot be cleaned with clean water can be cleaned with a cleaning agent.

8. The printing suitability of ink is affected by objective conditions such as printing conditions, surface characteristics of the substrate, environmental temperature humidity, storage time, etc. Therefore, when using it, some auxiliary agents 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.