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    Home > Coatings News > Paints and Coatings Market > The relationship between ink concentration and printing quality

    The relationship between ink concentration and printing quality

    • Last Update: 2020-12-07
    • Source: Internet
    • Author: User
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    The so-called ink concentration is also the coloring force of the ink, it is a reflection of ink dispersion and pigment content in the ink size of a common name. In other words, the higher the dispersion of the pigment, the higher the concentration of the ink, and the higher the pigment content in the ink, the greater its concentration. In addition to pigments to determine the concentration of ink, connecting materials, fillers and additives, to a certain extent, also affect the concentration of ink
    China
    . The production process shows that ink concentration is one of the important indicators affecting the printing quality, so it is very important to correctly understand and understand some factors related to ink concentration, so it is very important to control the production process and improve the printing quality of the product.
    ink is a hydrophobic collage, which is a uniform mixture of pigments, connecting materials, fillers and additives. Pigments are coloring substances that play a coloring role in ink. It is a non-insoluble in water and insoluble in the connecting material, but can be evenly dispersed in the connecting material of the colored substance, a powdered solid. The size of the pigment content in the ink determines the durability and concentration of the ink, and also affects the drying performance of the ink. Pigment, as the main material of color, plays a decisive role in the quality and suitability of ink. Therefore, for printing, only pigment particles fine, large amount of oil absorption, small proportion, small cover, strong coloring force, good stability, less color, bright colors, and with heat, light and acid and alkali resistance and other good performance, printing ink color can obtain better quality results. According to the properties and chemical composition of pigments, pigments are divided into inorganic pigments and organic pigments. Inorganic pigments include a variety of metal oxides, chromates, carbonates, sulfates and sulphides, such as aluminum powder, copper powder, carbon black, zinc white and titanium white, etc. belong to the inorganic pigment category. Inorgeable pigments have better light and heat resistance, and are stronger than major, covering force, but do not adapt to multi-color, high-speed printing requirements. Commonly used organic pigments include chromogenic pigments and chromosid pigments. Color-based pigments are mainly: nitro pigments, nitro pigments, anitrium pigments and reduced pigments. Color pigments are: alkaline dye chroma, anitric nitrogen pigment and acidic dye color. The vast majority of organic pigments have better coloring force, small particles, light weight, soft texture, bright color and high concentration advantages, is the main raw material of color ink. The connecting material is also the main component of the ink, it is to make the ink into a fluid raw material, with a certain viscosity, it plays a powdered pigment and other solid particles mixed together, and the adhesive pigment transfer, adhere to the print, while making the print has a certain gloss. Its color, pull, viscosity, water resistance, dryness and so on are important factors affecting ink performance, its dosing size, but also to change the ink flow and concentration of important conditions. The filler is a small, white powdery solid, so it can be evenly and well dispersed in the connecting material. Things like potassium sulfate, magnesium carbonate, calcium carbonate and aluminum hydroxide are fillers that regulate ink's ink properties, consistency and concentration. Ink pigments, connecting materials, fillers are processed into refined oil ink with a certain ratio, often due to different printing conditions, the original ink thick, thick and dry, etc. may not be able to adapt to a variety of conditions, generally through the use of some additives to adjust, such as anti-adhesives, de-adhesives, dry oil, bright paste and bright oil, these additives added ink, will also change the concentration of ink.
    ink concentration is large, its consistency is also large, so, the size of ink concentration, determines the depth of the ink hue. When the ink concentration is large, the printed color is dark; The ink with large concentration consumes relatively little ink in printing, and the ink quality is better. The concentration size of ink is particularly prominent when printing large area plate products. It can be seen that the ink concentration situation directly affects the printing quality of the product, therefore, in the printing of fine mesh lines or fine lines of products, generally to choose a large concentration of ink to print, and printing field layout of the product is suitable for a slightly lower concentration of ink to print. Because the ink has a "touch denaturation" side, when the printing environment temperature is high, the machine speed is fast, the ink is heat thinner, its concentration will drop, which requires a slightly higher concentration of ink to print, can better ensure the quality of the product ink. Conversely, a slightly lower concentration of ink can be used to print.
    If a small concentration of ink is used to print the base color or overlapping color plate, you have to increase the amount of layout cloth ink to obtain the required printed color, but this is easy to make the product has the underlying ills. Based on this situation, the ink used in color printing products generally take its color to adjust the color appropriately a little deeper, the concentration is also appropriately adjusted to be bigger, the printing effect is better, and is conducive to the printing of anti-stick. In addition, printing a large area of the field, line or mesh plate, printing speed should be adjusted a little slower to reduce the friction coefficient and heat in the printing process, to prevent the temperature rise too fast, so that the ink easily thinning fluidity increased and caused by the concentration reduction, printing ink lighter ills appear.
    process practice and analysis show that when the original ink is not used, its concentration is unchanged, but in the process of use, with the variation of consistency and fluidity, the concentration also changes. Changes in printing speed, temperature, and size of the lotion dosing can affect the concentration of inks. If the printing process of the layout moisture is too large, will also make the ink concentration is diluted, so that the ink color of the print appears to be light. It can be seen that ink concentration is the variability factor that affects the quality of ink color of the product, so it is of great guiding significance to correctly understand and understand some conditions related to ink concentration and to take corresponding process measures for printing to ensure the quality of ink color in printing
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