Influence of the most popular diluent on primary c

The influence of diluents on primary color inks

in the printing process, it is often necessary to mix light color inks of different depths to meet the production requirements. Generally, printing enterprises use the method of adding diluent to dark ink to obtain light ink. Diluent, also known as diluent, is a transparent or translucent additive. It is mainly used to dilute color and reduce ink saturation when added to ink. Commonly used diluents include viride oil, white ink, white oil, brightening paste, etc

I. characteristics and application of diluents

diluents generally do not change the adhesion, printability and other rheological properties of inks. Obviously, the more diluent is added, the lighter the ink color will be formed. However, it should be noted that after adding diluents, the proportion of pigments in the ink will also decrease, so if you add more, the hue of the printed pattern will turn gray, and the product strategy will lose its due gloss and saturation. In general, it is appropriate to control the dosage of diluent within 10% - 30%

diluent is different from diluent. It is a pigment free ink, which is composed of resin and solvent. In the printing process, if an ink is found to be dirty, poor fluidity and poor transfer after being diluted with diluent, the problem can be solved by adding diluent. Diluent has ideal ink transfer rate and has no hiding power. It can be printed separately to meet the special needs of prints. If the printed matter has the need of moisture-proof and anti ink layer falling, the diluent can be printed at the end, and the colorless diluent film can seal the ink layer, so that the moisture in the air is not easy to enter the ink layer and the interior of the paper, so as to play a moisture-proof role, so that the ink on the printed matter is not easy to fall off when rubbed by hand. At the same time, finally, printing with diluent alone can change the surface flatness of the printed ink layer, so as to change the reflection state of the ink layer to light, and make the impression appear brighter and deeper

diluents have different effects on different occasions. If it is added when adjusting the color separation deviation of the printing plate, it is a color reducer; When the printing speed is allowed to be increased, a small amount is added, which is a colorant; Adding it to the old ink to increase gloss and firmness is a supplement for the recovery of the old ink, and adding it to the ink with poor performance is an improver; The addition of diluent in ink does not affect the addition of diluent, but can add more diluent, which is a money saver to reduce costs. In short, diluents are widely used, especially for low-speed printing machines with poor ink circulation performance

II. Experimental preparation and process

through experiments, the influence of the amount of diluent added on the hue, saturation and lightness of three primary color inks is tested and analyzed, and the conclusion can provide guidance for printing enterprises to use diluent

preparation of yellowing, cracking, damage and peeling of the approved waterproof layer of experimental instruments and materials

printing suitability instrument, aiseli 3200 spectrophotometer (uv-3200 (PC) scanning ultraviolet visible spectrophotometer); Vance VSI yellow, magenta, cyan ink, HANGHUA diluent, Jindong paper 157G/㎡ Changhe coated paper

experimental process

select the above three color inks and diluents, and add diluents to the three primary color inks respectively, The content of diluent added to the ink of each color (mass percentage is 0, 10%, 15%, 20%, 25%, 30%, respectively). Mix them evenly, and sample them on the printing suitability instrument. The printing pressure is 100N, and the ink volume is 2ml. After the ink is dried, measure its R, G, b values with a spectrophotometer on 18 ladders, and convert them into HSB (hue, saturation, lightness) color space

III. experimental results and analysis

RG resin is divided into epoxy resin, phenolic resin, polyester resin and polyacrylic resin, and the data of B color space are converted to obtain the data of HSB color space. According to the data, the hue, saturation and lightness of trichromatic inks with different diluents were analyzed

the hue of green ink fluctuates around 199, magenta ink fluctuates around 324, and yellow ink fluctuates around 58, almost in a straight line, with no obvious change. Therefore, the addition of diluent within 30% has little effect on the hue of trichromatic ink

the saturation of blue ink does not change with the increase of diluent content, while the saturation of magenta ink and yellow ink decreases with the increase of diluent content. When the content of diluent exceeds 20%, the saturation of magenta ink decreases sharply; When the diluent content in yellow ink is between 0 and 25%, the saturation remains unchanged, and begins to decrease significantly after exceeding 25%

the brightness of cyan ink shows a slow upward trend with the increase of diluent content from 0 to 10%, remains unchanged after reaching 10%, and then starts to rise from 15%. Magenta ink brightness also shows a slow upward trend with the increase of diluent content from 0 to 10%, increasing from 15% to 20%, and continues to rise. After reaching 20%, it remains unchanged in a short range, and then continues to rise. The brightness of yellow ink keeps unchanged with the increase of diluent content from 0 to 20%, decreases from 20% to 25%, and remains unchanged after reaching 25%

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