What effect does ink concentration have on print quality?
Published on Aug. 01, 2019
What effect does ink concentration have on print quality?
The so-called ink concentration is also the coloring power of the ink, which is a common name for reflecting the degree of ink dispersion and the amount of pigment in the 4 Color Economicl Offset Printing Ink. That is to say, the higher the dispersion level of the pigment, the higher the concentration of the ink; the higher the pigment content in the ink, the greater its concentration.
In addition to the pigment resolution ink concentration, binders, fillers and auxiliaries also affect the ink concentration at a certain level. The state of consumption technology indicates that ink concentration is one of the important indicators affecting printing quality. Therefore, it is very important to correctly understand and recognize several factors related to ink concentration, to control the consumption process of the printing process, and to improve the printing quality of products. .
The ink is a hydrophobic colloid which is an average mixture of pigments, binders, fillers and auxiliaries. The pigment is a coloring matter and plays a role in color development in the ink. It is a colored substance which is insoluble in water and insoluble in the binder, but can be evenly dispersed in the binder, and is a powdery solid. The amount of pigment in the Eco Friendly Soy Based Offset Ink determines the durability and concentration of the ink, and also affects the boring performance of the ink.
As the main material for color development, pigment plays a decisive role in the quality and suitability of ink. Therefore, for printing, as long as the pigment particles are fine, the oil absorption is large, the specific gravity is small, the hiding power is small, the coloring power is strong, the stability is good, the color is less, the color is bright, and the heat resistance, light resistance, acid and alkali resistance, etc. are provided. Good performance, the ink color of the printed products can achieve better quality results.
According to the properties and chemical composition of the pigment, the pigment is classified into two types: an inorganic pigment and an organic pigment. Inorganic pigments include various metal oxides, chromates, carbonates, sulfates, and sulfides, such as aluminum powder, copper powder, carbon black, zinc white, and titanium white, all of which belong to the category of inorganic pigments. Inorganic pigments have better light and heat resistance, and are more severe than opaque, but do not conform to multi-color, high-speed printing requests.
Commonly used organic pigments include chromogenic pigments and lake pigments. The chromogenic pigments are mainly phthalocyanine pigments, nitroso pigments, azo pigments and reconstituted pigments. The lake pigments are: basic dye lakes, azo lake pigments and acid dye lakes. Most organic pigments have good tinting strength, small particle size, light specific gravity, soft texture, bright color and high concentration. They are the main raw materials for color inks.
The binder is also the main component of the ink. It is a raw material for making the ink a fluid. It has a certain viscosity. It is used to mix and bond solid particles such as powdery pigments, and to transfer and adhere the pigments. On the printed product, the print has a certain gloss at the same time. Its color, tension, viscosity, water resistance, boring, etc. are important factors affecting the performance of the ink, and its amount is also an important condition for changing the activity and concentration of the eco friendly Soy Printing Ink.
The filler is a fine, white powdery solid material, so it can be dispersed evenly and well in the binder. Potassium sulphate, magnesium carbonate, calcium carbonate and aluminum hydroxide are all fillers which act to control the ink's inkiness, consistency and concentration in the ink. After the pigment, the binder and the filler in the ink are processed into a waste ink by a certain amount of ratio, the thick, dark and boring of the original ink may not always conform to various conditions due to different printing conditions. Ordinary to use some additives to stop adjustment, such as anti-adhesive agents, debonding agents, dry oil, bright paste and varnish oil, etc., these additives will also change the ink concentration after participating in the ink.
The concentration of the ink is large, and its consistency is also large. Therefore, the concentration of the ink determines the depth of the hue of the ink. When the ink concentration is large, the printing hue is deep; on the contrary, the printing hue is shallow. The ink with a large concentration consumes a relatively small amount of ink in printing, and the color of the ink is also good. Conversely, the ink having a small concentration uses a relatively large amount of ink during printing, and the ink color is relatively greasy. The concentration of the ink is particularly prominent when printing large-area plate products.
It can be seen that the ink concentration directly affects the printing quality of the product. Therefore, when printing fine mesh or thin-line products, it is common to use a large concentration of ink to print, while the printed solid layout is suitable for a slightly lower concentration. The ink is printed. Since the ink has a "thixotropy" side, when the printing environment temperature is high, the machine speed is fast, the ink is heated and thinned, and its concentration falls, which requires printing with a slightly higher concentration ink to better ensure the color of the product. quality. Conversely, ink with a slightly lower concentration can be used for printing.
If the ink with a small concentration is used to print the background color or the color palette, it is necessary to increase the amount of ink in the layout to obtain the requested printing hue, but this is easy to cause the product to have a bottom-up. Based on this situation, the ink used in color printing products generally adopts a proper adjustment of its hue, the concentration is also appropriately adjusted, the printing effect is better, and the printing is resistant to sticking. In addition, printing a large area of the solid version, line version or textured version, the printing speed should be adjusted a little slower to reduce the friction coefficient and heat during the printing process, to avoid the temperature is too fast, so that the ink is easy to thin. The increase in sex leads to a decrease in concentration, and the disadvantages of lighter printing ink appear.
The theory of the process and the state of analysis indicate that the concentration of the original ink is constant when it is not used. However, in the course of application, the concentration changes with the variation of consistency and activity. Changes in printing speed, temperature, and amount of dampening solution can affect the ink concentration. If the moisture in the printing process is too large, the ink concentration will be diluted, and the ink color will appear pale. It can be seen that the ink concentration is a variability factor that affects the quality of the ink color of the product. Therefore, correctly understanding and understanding certain conditions related to the ink concentration and adopting corresponding technological measures to stop printing have very important guiding significance for ensuring the quality of printing ink color.