The basic skills and application of screen printing ink coloring

Adjustment of printing ink suitability. Usually the factory screen printing ink, the viscosity is slightly larger, the user should use the appropriate solvent, thinner, surface according to the characteristics of the printing image, the number of screen mesh, printing speed, workshop temperature, substrate surface tension and ink absorption properties Active agents, viscosity-reducing agents, etc., make comprehensive adjustments to the ink's viscosity, surface tension, flowability, and drying speed.

There are three things to note when colorizing screen printing inks:

a. When ink is mixed, ink with different colors should be added as little as possible. The less the type of ink, the better the mixing effect.

b. With the principle of “from shallow to deep”, besides formulating light-colored or vivid colored inks, care should be taken when the hue is close to the template. Different manufacturers of ink, it is best not to mix calls, as far as possible using the same manufacturer of different colors of ink for color, otherwise it will produce uneven color, in severe cases, there will be condensation and make the ink scrapped.

c. Some screen printing inks are dried by drying. Light-colored drying is lighter than unsealed, darker darkness after drying. In addition, it is easy to overlook the problem of whether the hue of the ink is different between before drying and after drying during printing. In general, through the natural drying (solvent evaporation type ink), the substrate is plastic, metal, paper, glass, etc., the color does not change; but if the ceramic used color, due to burning oxidation after the color Can only be color-tuned by experience. For screen printing inks that are dried by thermosetting and light-curing, the color changes in depth, as mentioned above. When the amount of ink is large, you can use the ink adjuster to complete the color adjustment in a short time.

The original ink color is mixed in different proportions, and many colors of ink can be dispensed.

The deployment of light ink is generally based on white ink, with appropriate color inks. Such as light blue, mainly white ink, slightly blue (cyan); light red, mainly white ink, slightly increase red; gray, mainly white ink, slightly black; silver gray, mainly white ink, slightly Add silver paste and add a trace of black ink. For the preparation of light-colored screen printing inks (printing materials), white ink should be added as little as possible, because the white ink has a large activity and is liable to cause discoloration in other colors.

In order to adjust ink well, silk screen workers must:

a. Understand the various specifications and performance of inks; make the inks that they are suitable for production needs.

b. Master the basic knowledge of colorology, and use it freely in the adjustment of ink.

c. Analyze the printing color and technology, find out the color sequence of multiple colors, so as to avoid wrong color sequence, miscible two colors, and color change.

d. Also pay attention to the color of the ink when adjusting the brightness of the ink, requiring a large brightness as much as possible to the original color to deploy, or easy to make out of the ink "gray", reducing the original color brightness.

Adjustment of printing ink suitability.

Usually the factory screen printing ink, the viscosity is slightly larger, the user should use the appropriate solvent, thinner, surface according to the characteristics of the printing image, the number of screen mesh, printing speed, workshop temperature, substrate surface tension and ink absorption properties Active agents, viscosity-reducing agents, etc., make comprehensive adjustments to the ink's viscosity, surface tension, flowability, and drying speed. Such as screen printing thin lines and dots, the ink should be slightly smaller, the drying speed can be slightly slower; coarse screen printing, the viscosity should be slightly larger, the drying speed can be slightly faster; high-speed printing, the flow is slightly larger, the drying speed can be Slightly faster; when the temperature of the workshop is high, the drying should be slightly slower and the viscosity is slightly greater; the surface tension of the substrate should be small, and the surface tension of the ink should also be smaller; when the ink absorption of the printing surface is strong, the fluidity and surface tension of the ink can be large. Some, the drying speed can be slower. Appropriate adjustment techniques also rely on practical experience.