Discussing the Preparation of Color Ink from the Point of Printing Process

The important point in ink dispensing is to master the principle of using the same type of ink and auxiliary materials of the same model. If the ink uses "05 type", auxiliary materials should also be matched to improve the printability of the ink. In addition, the number of primary color inks should be used as little as possible, that is, if the two primary color inks can be blended, the third type should not be used, so as not to reduce the brightness of the ink and affect the vividness of colors. There are two kinds of color ink deployment, one is dark ink deployment, that is, the use of three primary colors or the original color of the ink, without any bleaching agent deployment of the ink color; the other is a light color ink, that is, in the original ink to add dilute Formulated ink.

(-) Dark ink dispensing method and color principle

First of all, according to the original hue to determine the color of the ink to be used, and then take the appropriate amount of each color ink, on the ink station for a small amount of deployment. When deploying, one should master the principle of gradually adding dark ink in light-colored ink. Can not add dark ink and then add light color ink, because the light color ink color poor, if you use dark ink to add light-colored ink to the deployment, not easy to align the hue, often make the more the amount of ink adjustment, this It is not desirable. When the hue of the ink is adjusted to the hue of the original, the ink can be scraped with a printing paper and compared with the original. If there is any color shift, correct the color correction until it matches the printed sample. After adjusting the hue of the ink, the respective weights of the inks can be calculated so that batches can be prepared in proportion. If you use dark inks to mix dark inks, you should master their changing rules to improve the ink transfer effect. Such as: three primary colors ink mixing, the color obtained is approximately black; the two primary colors in the two primary colors equal or unequal temperature adjustment, can obtain a variety of inter-color, the hue is biased to the content ratio of the large fruit; Three primary colors of ink are mixed in various proportions to obtain a variety of complex colors; black ink is added to any color ink, and its brightness must be reduced to cause dark phase. If you add white ink, the brightness increases. The three-color inks can be used for the combination of color and complex colors. However, in terms of ease of deployment and minimization of the number of inks to be used, inter-color inks can be used.

In the deployment of complex color inks, we should grasp the principle of color, must not take "this color plus points, the kind of color plus points" to test. Such as the blue lake in the green ink corresponding to the use of sky blue or peacock blue, avoid using dark blue to adjust, because the dark blue ribbon red taste, after joining the inevitable dark color instead of bright. By the same token, it is not possible to add reddish dark yellow ink, and the pale yellow ink should be used. For example, when red orange ink is used, red ink cannot be used because it has a blue taste, and the green color of blue and yellow is a complementary color of red, which makes the ink lack a bright sense.

The color of some inks has its unique hue, just as the reddish hue of red is yellow, and for oranges it will increase the vividness of blacks. Indian orange color, if the effect of orange ink printing does not reach the bright, and the printing is less realistic, with red and lemon yellow mixed, printing color is much better. Another example is that the green scenery of the early spring should be printed with pale yellow ink to print the green and lovely leaves. If you use dark yellow ink tone, dark yellow ink contains red taste, red is green complementary color, the printed leaves must be dark, cloudy, not reflect the breath of early spring.

In the deployment of complex ink, if you use the complementary color to correct the color cast, the color effect will be better. For example, if the color of some complex color ink is heavy, the yellow ink may be added to correct; if the red flavor is heavy, blue ink (such as peacock blue or sky blue ink) may be added to correct, and the effect of adding less amount and adjusting the hue effect can be achieved. . Another example is the black and yellow ink is not enough black, you can add a small amount of light blue as a color material, because the blue light is a blue ink with red light, but also the result of complementary color.

(B) Preparation of pale ink

Light-colored ink is ink added with diluting agent in the original ink, or mixed with other inks in white ink. The method of dispensing is based on the principle of diluting agent or white ink, supplemented by other color inks. Firstly, dilute the appropriate ratio of diluting agent or white ink, and then add the color inks in different times, so that the ink is uniformly mixed while observing the hue changes. When the degree of diluting is appropriate, use the printing paper to smear the ink color sample and the original document and adjust it to the proper level.

Dimmed color inks, distinguished from hue, also have primary colors, inter-colors, and complex colors. Any use of the three primary color inks to dilute, as long as the primary color ink can be added in batches. However, if it is between the color, complex color, lack of ink transfer experience, it is best to first mix the original ink into the dark ink of the ink color, and then add the dilute. The deployment of light-colored inks and mastering the degree of ink dilution are important technical aspects. If the dilute ratio is not enough, it will cause the lack of ink on the surface of the ink roller. The printed ink on the printing surface is prone to blooming. The ink layer will not dry and the color will not be bright. If the ink dilutes too much, only the thickness of the ink layer can be increased to achieve the desired hue for printing. In this way, the transfer of ink will make it easy for the layout of low-key areas to appear paste version, can not tell the depth level. At the same time, it is also easy to cause the bottom of the imprinting phenomenon.

The deployment of light-colored inks should be based on the product quality requirements, as well as the paper characteristics, select the appropriate ink and diluting agent. Such as printing offset paper with 10 type ink printing general products, you can use "915" dilute agent (dimensional force oil) or "554" transparent oil. If the printed coated paper uses type 05 ink printed fine products, you should use 05-90 bright light or "8011, 8015" lighter. The deployment of light-colored inks should also pay attention to the original ink that is not resistant to light, is not resistant to oxidation, and is easily discolored, and should be avoided as much as possible for the deployment of light-colored inks, so as not to cause color instability. In addition, due to the fact that the white ink ratio is significant, in addition to the requirements for masking and color matching, a small amount is added for calling, and as far as possible, white ink is not used for diluting. In order to prevent the occurrence of poor color, color and other quality problems. When deploying inks, it is also necessary to pay attention to the proportion of different inks, such as the use of lead-chrome yellow ink and peacock blue green ink with a relatively large proportion. After a long time, the ink with a small proportion will float, and if not, it will sink. “Floating”, if the yellow ink made of organic yellow pigments is used for deployment, this phenomenon will not occur.

To sum up, only by learning to master color knowledge and understand the relevant conditions and use characteristics of inks and auxiliary materials can we scientifically deploy various color inks to meet the requirements of improving printing quality and production efficiency.