From original analysis, toning, to scraping, each step has strict requirements on the use of ink, soft packaging factories can not be reduced because of factors such as saving, otherwise it is easy to bring significant losses in print quality.
| Original Analysis
In order to get the same graphic color of the original, we should analyze which color ink the original is composed of, and then analyze the color composition of a certain color ink. To analyze the original, it should be noted that when viewing a particular color of the original, the surrounding parts should be covered to prevent color juxtaposition. The best light is indirectly bright daylight, if you like to observe in daylight will make the original blue, if the incandescent lamp viewing will make the original yellow, the color of the substrate, surface conditions, etc. will have an impact on the color of the printing ink.
| Color mixing
When adjusting the color, try to use the same hue, the same type of fixed ink, because its saturation is higher than the two colors of ink blended out. Try to reduce the variety of new ink, because the more varieties, the higher the proportion of color elimination, the brightness of the new ink with reduced luster, reduced saturation, the loss of color vividness; to use to several shades of ink should try to use the color close to the final ink; different manufacturers, the same manufacturer of different types of ink can not be mixed, in order to avoid gelation, precipitation, discoloration and other failures.
When adjusting the color, the hue, concentration and saturation of the three have an impact on each other, when changing the hue of the ink color, brightness, saturation will also change. Therefore, when correcting the color difference of the ink, we should clarify which aspect of the difference is the hue, brightness or saturation, and then we can prescribe the right medicine.
When adjusting the color, in order to obtain light-colored ink while keeping the viscosity of the ink unchanged, a watering agent can be used. In fact, it is a kind of toning material that does not add pigment but keeps other components in the ink, and the viscosity has been adjusted to the use of viscosity. If a solvent is used to adjust the ink color, the viscosity of the ink decreases as the ink color changes, and the adhesion and thickness of the ink film decreases as the proportion of the binding material in the ink decreases.
| Light-colored ink blending
To mix light-colored ink, white ink or lightening agent is used as the high level, and other inks are used as the supplement. Put white ink into the barrel, add other inks gradually, mix evenly, watch the difference of color with the original by comparison until it meets the requirement, and record the ratio of each color ink and the reserved color sample to make comparison and accumulate experience. Note: Add white ink without solvent when diluting, and select the color correctly.
| Deployment of dark ink
For dark ink blending, use the original ink or indirect ink blending; put the original ink (the largest proportion of one color ink) into the ink barrel, gradually add the auxiliary color ink, blend evenly, and watch the difference of color with the original by comparison until it meets the requirements, and record the proportion of each color ink and the reserved color sample for comparison and accumulation of experience. Deepening the color can also be achieved by adding layers of the mesh size of the plate, that is, thickening the oil layer, can also increase the amount of color material to achieve, but the economy is not good.
| Coloring color relationship
When adjusting the color should be the correct use of color relations, for example.
① When blending inter-color or lighten the original color ink should try to avoid the mixing of complementary color ink, otherwise, due to the increase of the color elimination component, the saturation of the color decreases, and the color becomes dark.
② color deviation need to correct the color can be used to reduce the color complementary principle. When the ink is yellow, in order to eliminate the yellow tint, you can add a little violet tinted ink in the ink, yellow and violet complement each other, mixed with each other for the elimination of color.
③ The color phase can also be used to add color complementary principle: blue ink reddish need to be changed to yellowish, just add a small amount of green ink in the ink, because the red light reflected in the ink and green light mixed into yellow light, the reddish blue ink will become yellowish.
④ Green can eliminate the yellow tint in white, in order to make the white ink white, you can add a small amount of ultramarine.
⑤ Adding a small amount of phthalo blue to black ink can reduce the yellow tint in black ink, and the black ink will become black.
| Scraping
When scraping the sample, it should be noted that there is a difference in the color of the black ink before and after it dries. The substrate used for scraping should be the same as the original to avoid color difference, and the lighting conditions are very important when matching the color.
