The preparation of ink is an important work in the color printing process, which is directly related to the printing quality of the product. Because the color is bright and the brightness is good, the hue is accurate is the basic requirement of the color printing products, to achieve this requirement must first accurately deploy the printing ink. Therefore, the operator must master the color knowledge and ink mixing process.

Mixing of dark and light inks

The deployment of ink can be divided into dark ink and light ink deployment. The so-called dark ink refers to: only the primary color ink is prepared without adding any diluent. According to the amount of ink required for printing, the main color ink and the auxiliary color ink determined by color analysis are blended together. The deployment of dark ink is divided into three kinds: monochrome, intercolor and compound color. Monochrome refers to a primary color 1 composed of ink. Intermediate color refers to: composed of two primary colors of ink. Compound color refers to the mixing of three kinds of ink.

Any ink that is prepared by adding diluent is called light-colored ink, and three points should be noted when deploying:

1.Use white ink without diluent;

2.when the color is mainly white ink, add a little color ink to the white ink;

3.the color selection should be accurate

It is necessary to master the change law of the three primary colors in order to achieve accurate ink allocation

Any color can be mixed using different proportions of the three primary colors. The color change of ink is the use of this law. For example:

1.Three primary color ink can be mixed into black (approximate).

2.The three primary colors of ink equal mixing and adding different proportions of white ink, can be matched into a variety of different shades of light gray ink.

3.The three primary colors of ink with various proportions of mixing, can be deployed into a variety of different colors of the intermediate color or compound color, but its color tends to a large proportion of the primary color.

4.Two kinds of original color ink after equal mixing, can become the standard intercolor; After the two primary colors are mixed and blended in different proportions, they can be matched into a variety of secondary colors with different hues, but their hues tend to be the primary colors with large proportions.

5.Any color of ink, adding white ink after its hue appears brighter. When black ink is added, the hue becomes darker.

The above primary color ink deployment into a variety of colors is based on the subtractive theory of the three primary colors.

When mixing ink, we should first analyze the hue of the color draft, and use the complementary color theory to correct the color deviation and improve the setting effect

When receiving the printed manuscript, we should first carefully appreciate and analyze the various colors in the original manuscript, and weigh the proportion of the ink hue to be adjusted. The analysis of color is to master a basic principle, that is, the three primary colors are the basic colors of any color. In general, the application of the change law of the three primary colors, in addition to gold and silver color, any complex color can be deployed. However, in the process of process practice, it is not enough to rely only on the three primary colors to deploy countless ink colors. Because, in fact, because the pigment used to manufacture the ink is not very standard, even each batch of ink produced is inevitably different in color to a certain extent. Therefore, in the actual work should also be used such as medium blue, dark blue, light blue, light blue, medium yellow, dark yellow, light yellow, gold red, orange red, dark red, light red, black, green and other colors of ink appropriate to add, in order to achieve the required ink color. There are many types of ink, but in any case, in addition to the three primary colors of ink, other colors are used to supplement the deficiency of the three primary colors. Any complex color, always change in the range of three primary colors, as long as you master this principle, ink is not a problem.

When the color analysis determines the main color and auxiliary color inks and this example, it can be blended. However, if there is a deviation in the hue, the complementary color theory can be used to correct its hue. For example, if a certain color is too green, a small amount of red ink can be added to correct it. Conversely, too much red can be corrected by adding blue ink.

The blending of intermediate and compound colors

The so-called intermediate color is a mixture of two primary colors of ink. For example: the color of the intercolor is red and yellow after the hue is orange; Yellow and blue make green; Red and blue make purple. The different proportions of the two primary colors can be mixed and adjusted to produce many kinds of intermediate colors.

1. The primary color pink and yellow to 1:1 mixing, can get bright red color; If mixed with 1:3, deep yellow can be obtained; If the mixture is 3:1, the golden red hue can be obtained;

2.The primary color yellow and blue equal mixing, can get green; If the mixture of 3:1 can get green color; If the mixture of 4:1 can get apple green; If you mix 1:3 to get dark green.

3. The primary color peach and blue with 1:3 mixing and matching, can get deep blue purple; If the mixture is 3:1, the approximate blue color can be obtained.

The compound color is derived from the mixing of three primary colors of ink. If they are mixed in different proportions, many kinds of complexions can be obtained.

1. the primary color pink, yellow and blue equal amount of matching, can obtain approximately black;

2. 2 parts of peach and 1 part of yellow and blue can be mixed to obtain brownish-red;

3. 4 parts of peach and 1 part of yellow and 1 part of blue can obtain reddish brown phase; If the peach, yellow each 1, 2 blue, can be adjusted to olive; Peach, yellow each 1, blue 4 mixed matching, can obtain a single green hue.

Deployment of black operation essentials

When dispensing ink, it is necessary to analyze the hue according to the original manuscript, and determine which kinds of ink should be used to allocate suitable. To adjust lake blue ink, it can be determined by visual inspection and practical experience that white ink should be mixed with peacock blue. Among them, white ink is the main color, peacock blue is the auxiliary color should be slightly added. For a darker shade add a touch of indigo. To adjust the olive yellow green ink, it can be determined to be white ink, add light yellow and peacock blue and slightly add peach. As long as the main color is determined, the other colors are auxiliary colors, which should be gradually added and stirred evenly. After that, two pieces of paper (the same as the printing paper) are used, one of the paper is coated with a bit of the adjusted ink, and the other piece of paper is scraped to the thickness of the printed ink layer, that is, compared with the original to see if it is suitable. When comparing the sample, it is necessary to scrape the ink layer of the paper and the relatively thin and light parts to see more accurately.

When mixing ink, we should also master a principle, that is, try to use different colors of ink as little as possible, that is, if you can use two kinds of ink, do not use three kinds of ink to adjust, so as not to reduce the gloss of the ink. On the other hand, the scratch should be slightly darker than the primary color, so that the printed color can be more accurate. After the ink tone of the sample is correct, the ink can be adjusted in batches according to its respective ink proportion to ensure the quality of ink adjustment and improve work efficiency.

How to improve the gloss of ink film

1.Add appropriate amount of ink mixing oil within the allowable range of color concentration. 2. Coat the surface of the printed film with gloss oil or ink oil. 3, increase the transparency of the ink, choose a high transparency of the ink or add an appropriate amount of ink oil, the use of smooth, reflective substrate printing surface smoothness. 4, prevent the substrate surface adsorption, reasonable improvement of the substrate printing surface smoothness. 5, pay attention to the printing environment temperature, humidity. When plastic gravure printing is carried out in the case of high humidity and low temperature, due to the rapid volatilization of the solvent, the heat around the ink film is absorbed, and the water vapor in the air there is sharply condensed, which causes the surface of the printing ink film to form fog, resulting in the tarnishes of the ink layer.

In the Meiyu season, special attention should be paid to controlling the temperature and humidity of the printing environment to ensure good printing results. Usually, the room temperature is the best at 21-23 ° C, and the humidity is controlled at 40%, which contributes to the true reproduction of color.

Special color arrangement

1. Gold, silver ink allocation: use the ink mixing oil to add an appropriate amount of gold powder, silver powder can be stirred evenly, pay attention to choose the appropriate fineness of gold powder and silver powder, but also choose the ink oil that meets the printing substrate. It is also prepared at the time of printing to prevent the ink from precipitation and stratification due to too long rotation time, and gold ink can also be mixed with silver powder, transparent yellow, and ink oil. When the pen is matched with gold ink, gold powder (green light) is used: yellow oil: transparent yellow = 1:3:2, the effect is good. If you want to prepare red light hue, just change the gold powder to red light. The choice should be determined according to the customer's requirements.

2.Pearlescent ink deployment: pearlescent pigment and the appropriate proportion of high transparency ink or ink oil mixed evenly. Ink covering power is strong, may lose the application of the pearl effect, must pay attention to,

3. Luminous ink deployment: ink has absorption of light energy, in a certain period of time and then the effect of light, so often can shine at night, it is called luminous ink or phosphorescent ink, usually the luminous pigment dispersed in high transparency of the oil, stirring evenly.

4. Plastic film is non-absorbent material, can not use diluent to dilute ink, should add white ink to dilute.

5. Different manufacturers, different varieties of ink mixed, which will affect the gloss, purity and drying speed of white ink, different types of ink mixing will directly change the original resin color change, ink deteriorates, so we should pay more attention.

Summary: When matching ink color, we must carefully grasp each mark in order to deploy a good color, the final result is to meet customer requirements, quality to ensure that the ink color of different batches is consistent.