Ink basics: What is gloss, hue, tinting strength, hiding power?
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In the ink color matching process, the ink used is determined according to the actual printing process, the thickness of the ink layer, the substrate to be printed, and the like. When selecting inks, consider the gloss, hue, tinting strength, and hiding power of the ink itself.
1, luster
Gloss can be measured either by instrument or by the naked eye, usually by visual inspection during color matching. Gloss actually refers to the extent to which an ink print sample reflects light in the same direction after being illuminated by light. It directly affects the appearance of printed matter and is a very important indicator. At the same time, when selecting the ink, it is necessary to distinguish whether the ink itself is a bright, semi-light or matte ink to avoid mixing errors.
2, hue
Hue is the basic feature of color and is used for qualitative differences. When color matching, first consider whether the hue is consistent. The detection method is usually to scratch the color by scraping paper or simulate printing, and compare the standard sample and the sample with the human eye.
3, hiding power
The hiding power is the extent to which the ink covers its background. The better the hiding power, the worse the transparency, and the transparency affects the efficiency of ink coloring and the degree of influence on the printed substrate.
4, tinting strength
The tinting strength is a method of indicating the concentration of the ink. The measurement is performed by diluting and mixing a certain amount of ink and adding a certain amount of standard white ink, and then comparing with a standard sample. The intensity of the difference color reflects the degree of color mixing of the ink and affects the thickness of the printed ink film.
By using the color identification scratch paper to do the Drowdown test, the difference between the ink sample and the standard sample in terms of gloss, hue and hiding power can be compared. Specific method: put the standard ink in the upper left corner of the identification paper, and put the color ink in the upper right corner. The distance between the two is about one centimeter. Use a scraper to flatten the thin part and the angle of inclination at a nearly vertical angle with the scraping paper. The force quickly spreads over the thick part.
After the surface of the ink is dried, the hue of the ink can be observed in a thin portion, the hiding power and transparency of the ink are identified in the black strip portion, and the difference in gloss between the two is judged in the thick portion and the appearance of the entire color is observed. Black and color inks are usually white-scratched paper, while white inks are black-scratched paper.