Technical level analysis

Screen printing technology has been continuously developed and perfected and has become an indispensable part of human life. The screen printing ink refers to all the inks used in the screen printing mode. With the wider application of the screen printing ink, the problems are more and more. The following small series for you to analyze, what factors affect the saturation of ink printing?

Viscosity value

The viscosity of the ink should be controlled within a suitable range, that is, the viscosity must be proportional to your speed and solvent drying rate. The printing machine we are using now is a high-speed printing machine. During high-speed operation, the evaporation rate of the solvent is relatively fast, and the viscosity of the ink is required to be relatively low.

2. Imprint roller

It is important to choose the right pressure roller. The spot color layout is large, and the transfer rate of the ink on the plate roll is relatively high. If the emboss roll with relatively high hardness is selected, the ink can not be well wetted throughout the layout during transfer, which will reduce the ink. Transfer rate to the printed substrate.

3. Ink

When all are produced with old inks, similar problems are likely to occur. The old ink is mainly stored for a long time. If the seal is not paid attention, there may be oxidation of the ink, the solvent in the ink volatilizes, absorbs the moisture in the air, the resin and the pigment in the ink are relatively reduced, and the gloss of the ink is lowered.

4. Solvent

Solvent ratio is the key. In high-speed printing, the drying speed of the solvent should not be too fast, so slow-drying solvent to produce! Adding solvent to the principle of adding less and adding less, adding and stirring from the ink filter socks, do not add from the ink pot, and the strength can not be too large, otherwise it will have an effect on the hue of the ink.

5. Scraper angle

It is not suitable to make a special color plate scraper. It can be softer. The distance between the scraper and the platen roller can be relatively far. The angle of the scraper should be produced at an angle of 45-50 degrees. It should not be too flat or too steep! This can take into account the problem of ink and dry plate.

6. Production environment

When we stopped in the early stage, a layer of water mist appeared on the surface of the plate roll. The current relative wetness of our workshop is 80%, and the normal relative humidity of the printing workshop is 50%.

7. Plate roll

If the mesh of the plate roller is deep and the groove of the plate roller is not well done, the ink cannot be leveled normally, and the transfer rate of the ink is effectively reduced.

8. Raw materials

Before the film of raw materials is printed, the corona strength value must be checked. If the ink is too low, the ink cannot be fully transferred. Especially in the case of shallow screen printing, there will be a quality problem of poor transfer like plugging. This problem is mainly caused by the surface of the film. The corona impact strength is not good, the surface of the film does not form a rough surface, the surface tension of the material can be greater than the surface tension energy of the ink, the ink cannot form an effective adhesion on the film, and the ink cannot be sufficiently transferred, so that the ink cannot be rendered. Out of effect.