Talk about several principles of printing ink
Ink mixing is also called ink or ink adjustment, that is, adjusting the printing suitability of the ink during the printing process, or using the color material subtractive method to mix the ink of the desired hue with the three primary color inks, which is an indispensable important in the printing process. Link. Whether the ink is properly formulated directly affects the quality of the printed matter. In this article, the author will share with you the basic principles and practices of ink blending.
Basic principles of ink blending
1. Concentrated
Concentrated light printing means that the required ink is formulated to be slightly thicker than the color sample, and the amount of ink is intentionally reduced during printing to meet the color sample requirements. This is because the ink layer thickness influenced by the hue, with the same printing ink, when the ink layer thickness variations presented hue will also change, in particular when using offset printing process, by the offset process limitations, The ink layer should be thin and not thick.
2. Use as few color materials as possible
According to the color reduction method, when the ink is formulated, the more the color materials used, the darker the ink color is. Therefore, try to use the least amount of color material to maintain the brightness of the ink color. In addition, you must make good use of black ink and white ink. In any ink, the addition of black ink will darken the ink color, and the addition of white ink will reduce the saturation of the ink color.
3. Grasp the change of hue before and after drying of the ink
The hue of the same ink before and after drying differs greatly, especially for screen printing inks. For example, a light gray ink is prepared, and the color of the color sample scraped when it is just adjusted is in accordance with the original color sample, but after the ink is dried, the color thereof is significantly deeper. A similar situation can occur with inks of other colors.
In order to avoid this situation, the ink should first be scraped when the ink is prepared. After the ink of the color sample is dried, it is compared with the original color sample to prevent the color before the ink drying from conforming to the color sample and the color is out of shape after drying. Loss due to color mismatch.
4. More than
To match any kind of ink, first determine the main color according to the original color sample, and based on this, add the secondary color until the color meets the requirements of the original color sample. For example, if the light gray ink is blended, white ink should be used as the main component, and a small amount of black ink should be added to form a light gray ink. For dark gray inks, black ink should be used as the main component, and a small amount of white ink should be added to form dark gray ink. In the actual work, according to the specific circumstances, carefully analyze the composition of the color of the original color sample ink, determine the main and auxiliary relationship of the ink, according to the principle of "multiple-based".
Some practices of ink blending
1. Ink printing suitability adjustment
Fluidity and drying speed are the two main properties of the ink, and special care is required when performing ink blending.
(1) Ink fluidity
The requirements for ink flow are different depending on the substrate. For example, a primary color ink, when printed on double coated paper, its fluidity meets the printing requirements, and when printed on a double-adhesive paper, it is necessary to increase the fluidity of the ink to adapt to the printing suitability of the double-adhesive paper. Under normal circumstances, a substrate with a smooth surface and poor penetration ability requires a small fluidity of the printing ink, and a substrate having a rough surface and a strong penetrating ability requires a large fluidity of the printing ink.
(2) Drying speed of ink
The drying of ordinary inks is mainly realized by three forms of volatilization, permeation and surface oxidation and conjunctiva, all of which are affected by the temperature and humidity of the printing environment. Therefore, when adjusting the drying speed of the ink, it is necessary to fully consider the change in temperature and humidity of the printing environment.
2. Gold ink and spot color ink blending
Gold inks and spot color inks are two special types of inks. The mixing method is different from ordinary inks and requires special attention.
(1) Gold ink blending
1 offset gold ink blending
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