The screen printing mesh plate is soft and flexible, and the printing pressure is small, so it can be printed not only on soft substrates such as paper and textiles, but also on glass and ceramic vessels which are easily damaged by pressure. What is also needed in screen printing during the printing process is to consider the setting of the viscosity of the screen printing ink.
What are the factors for the viscosity of screen printing inks?
the first. The dissolved viscosity of the resin in the ink itself. That is, the smaller the solution viscosity of a certain amount of the resin and the solvent, the smaller the viscosity of the ink, and vice versa.
Second. The compatibility of the pigment and the binder, the pigment and the binder in the ink production do not undergo a coagulation chemical reaction, and here refers to whether the ink is thickened after the ink is produced. Small method: take the ink in the stock, shake the ink bucket to hear the sound, loud sound of the ink is good, because the ink is stored for a period of time, there may be thickening phenomenon. The miscibility and compatibility of the solvent and the dispersion.
The viscosity of the ink is not suitable. There may be some problems. Printed pattern prints, pinholes, large areas of small holes, ink layer is not flat, not smooth, dot weakness, halo, print adhesion decline. There is no quantitative standard for the viscosity of the ink. It should be set according to the printing conditions, such as the depth of the plate, the size of the printed product, the printing speed, the solvent ratio, whether it is printed or printed, especially the ink. The original viscosity and quality are quite important.
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