Silk screen printing ink basic coloring method and precautions
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The so-called color matching is to combine two or more colors, or a small number of colors in addition to the main color to form a combination of colors. When the color ink is used before the first use, the color to be prepared on the color sample is separately exposed, and the original (or the original) color is correctly identified as the primary color, the intermediate color, or the complex color. If it is a color or a complex color, you need to distinguish the ratio of the primary color to the secondary color. Secondly, according to the hue of the original indication, the sample should be debugged. When the color difference is small or equal compared with the original, the batch can be adjusted in a large amount, and the time should be short. Too little adjustment, resulting in downtime, ink hue is different, affecting normal production; too much will cause unnecessary waste. Ink adjustment is usually done where the light is stable or where the light is not directly shining.
There are three points to note when tinting inks are tinted: a. When dissolving ink, try to add less color inks. The less the color inks, the better the mixing effect. b. With the principle of “from shallow to deep”, no matter whether you are preparing light or bright colored inks, be careful when the hue is close to the sample. Ink produced by different manufacturers, it is best not to mix and call, try to use the same manufacturer of different colors of ink to color, otherwise it will produce uneven color tone, in severe cases will appear condensation and ink scrap. c. Some screen printing inks are dried by drying, lighter drying is lighter than undried, and darker after drying. In addition, whether or not the color tone of the ink differs before and after drying at the time of printing is a problem that is easily overlooked. Generally speaking, through natural drying (solvent evaporation ink), the substrate is plastic, metal, paper, glass, etc., the color does not change; but if it is a ceramic color, it is colored after burning and oxidation. It can only be toned by experience. For screen printing inks that are dried by thermosetting and photocuring, the color varies in depth, as mentioned above. When the amount of ink is large, you can use the ink adjuster to complete the coloring in a short time.
The mixing of light-colored inks is generally based on white ink, and the appropriate color ink is adjusted. Such as light blue, mainly white ink, slightly added blue (cyan); light red, mainly white ink, slightly increased red; gray, mainly white ink, slightly black; silver gray, mainly white ink, slightly Add silver paste and add a small amount of black ink. To prepare a light-colored silk screen printing ink (printing material), it is necessary to add as little white ink as possible, because the white ink is active, and it is easy to cause discoloration of other colors.
Silk screen workers must adjust their inks and must: a. Understand the various specifications and performance of the ink; make the inks suitable for production needs. b. Master the basic knowledge of color science and use it freely in ink adjustment. c. Analyze the color and process technology of printing to find out the color sequence of multiple sets of colors, so as to avoid the color sequence is wrong, the two colors are miscible, and the color changes. d. Pay attention to the brightness of the ink color when adjusting the ink. It is required to use the original color as much as possible. Otherwise, the ink that is transferred will be “grey” and the original color brightness will be reduced.