This article mainly introduces the technical points of color decoration and some troubleshooting methods.

First, the technical point of color decoration

There are mainly the following aspects

1, gold and silver

In order to ensure the purity of the ink, when printing the gold and silver inks lastly, first wet the mesh with a washing solution 783, clean the surface, wait for the solvent to evaporate completely, and then re-ink the ink, because the gold and silver inks will react when they encounter the solvent. , causing ink discoloration. Because of the poor mobility of gold and silver inks, it is often necessary to add a varnish or a slow-drying agent to increase the fluidity of the ink, and to prevent the formation of an oxide film that can cause darkening of the ink film without adding a small amount of yellow ink. . To bring out the gloss of gold/silver foil, add some slow drying agent as appropriate.

2, pearl ink

Pearlescent pigments can be combined with transparent pigments or dyes to give unique pearlescent effects, but should avoid mixing with opaque pigments, and should avoid mixing pigments with complementary color pearlescent pigments. When using silver white pearlescent pigments, a small amount of carbon black or blue pulp should be added to enhance its pearlescent effect. The pearlescent pigments have a good dispersion and should avoid the long-term effects of strong shear forces. This kind of ink will precipitate in the low viscosity varnish, and should be stirred gently before use, and it will not affect the use effect.

3, luminous ink

Adding a certain proportion of light-storing material in transparent varnish can be formulated as a light-emitting ink. The particle size of the light-storing material should be controlled within the range of 45 to 65 μm so that a useful light-emitting ink can be formulated. Note on the use of luminescent ink: The viscosity of the processed luminescent ink is slightly thicker at about 300-500 Pa·s. When printing, according to the printing speed, the viscosity of the ink is adjusted with thinner to meet the printing needs. When printing patterns and logos with luminescent inks, polyester screens with a size of less than 150 mesh are generally selected. In order to obtain the best luminescent effect, 80-120 mesh screens may be used. The luminescent ink is printed on a white substrate, which can increase the brightness and afterglow time of the printed pattern or logo. When the coating thickness of the printed luminescent ink is controlled at 130-150 μm, the luminescent effect is the best. If it is printed twice with a 80-mesh screen, this thickness can be achieved.

4, fluorescent ink

Fluorescent inks are suitable for screens and high-tension screens up to 300 mesh. When the printing ink on the substrate is transferred at 50 to 60 g/m2, the hair color and light resistance are ideal. Glossy processing will slightly reduce the fluorescence effect, so use a good transparency oil. When the substrate is a transparent object, the white ink must be printed before printing the fluorescent ink, which can improve the fluorescence effect. Can also be printed on paper with high whiteness, the higher the whiteness of the paper, the better the printing effect. When using a fluorescent ink to print the background color, the color will be better and the light resistance will be improved if the same color printing is used. For four-color printing, if you print red, yellow, you can get bright prints. Pay attention to the printing sequence to improve the printing effect.

The range of UV ink color choice is very wide, and the ink with strong coloring power is selected, the amount is less; the greater the pigment dispersion, the stronger the coloring power; the smaller the pigment particles, the greater the hiding power. Color mixing ink generally uses primary colors. For example, on electronic elements, silver and black background colors are generally used. The contrast should not be too large. Do not mix white, black and blue colors. Specific colors interfere with the absorption of light energy, resulting in difficulty in curing. The proportion of the colorant should not be too large, and it must be precisely controlled. Otherwise, the UV curing of the ink may be affected, because the greater the specific gravity of the colorant contained in the UV ink layer, the greater the UV blocking effect of the ink layer. It takes much time to completely cure the ink layer, and if the ink layer is not completely cured, the print has poor wear resistance, solvent resistance, and the like. Screen printing crystal glue or UV crystal glue, can not see a significant effect, sprinkled with colorful glitter, like a greeting card as gorgeous. ( I ) (II) (III) (IV) (V) (VI) (VII) (VIII) (IX) (X) (11) (12)