Summary of spot color ink blending and residual ink utilization experience
Spot color ink blending refers to mixing two or more inks in different proportions to obtain the desired ink color. The color matching principle is the color material subtractive method. Currently in the packaging Printing companies, short-run printing and on-site spot color printing are getting more and more jobs, and spot color inks are being used more and more frequently. However, when the spot color ink is blended, the waste is adjusted, and the adjustment is reduced, and the downtime adjustment is required, which is not only time-consuming and laborious, but also difficult to ensure the consistency of the ink color, thereby affecting the quality of the printed product. Therefore, how to accurately control the amount of spot color ink is critical.
Determine the amount of spot color ink according to the number of prints
The empirical formula for controlling the amount of spot color ink: 1 kg ink is approximately equal to the amount of ink required for full-page printing of 1 paper (size 787 mm × 1092 mm). Other papers of different opening degrees and solid color blocks of different areas can also be converted according to the above formula according to the specific conditions of the job. It should be noted that the actual amount of adjustment is about 0.5kg more than the conversion result to offset the loss during car wash and adjustment.
Determine the basic law of deployment according to the color reduction method
According to the color material subtractive method, after the three primary color inks are mixed and blended, an approximate black color can be obtained; after the three primary color inks are mixed and mixed in different proportions, various different complex colors can be obtained; after the two primary color inks are mixed and blended, the same can be obtained. Approximate standard color. By adding different proportions of the thinner, the brightness and saturation of the ink will change. In actual production, after we get the original, we must first analyze whether the hue of the original is a color or a complex color, and then find the proportion of the dot of the similar color block on the chromatogram, and then perform the blending.
Remaining ink treatment of spot color ink
How to deal with the residual ink of the spot color ink is also worthy of consideration for the packaging and printing enterprises. If you just put it on the side for a long time, it will cause the waste of dust to crust, even oxidative deterioration or direct scrapping, resulting in unnecessary economic losses. In fact, we may wish to take the following two methods to deal with, in order to minimize losses.
(1) When performing another batch of dark solid spot color inks, according to their composition and hue similarity
Sex, may be mixed with the original spot color ink, but be careful not to change the hue of the adjusted ink.
(2) For the residual ink of each color stored for a long time, it can be blended into black ink according to the principle of coloring of the three primary colors of the ink color. If the blackness is not enough, the black ink of the primary color can be appropriately added. In four-color printing, the black version "stripes" and "emphasizes" the dark portion of the pattern without affecting the basic color of the pattern. However, since there is more ink in the black ink blended by the residual ink and the blackness is limited, the ink spots are easily generated when the printed solid color package is printed, and the brightness and brightness are lacking. Therefore, we should try to avoid using this black ink to print the solid pattern, which can be used for book text printing and ordinary color printing.
　　 The above content is selected from the first issue of 2011, Printing and Printing , Packaging and Decoration, and more journal content. Please pay attention to the journal channel.
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