Brief introduction of the elements of the hottest

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Brief introduction to the elements of water-based ink

viscosity of water-based ink flexographic printing refers to the low viscosity of water-based ink, and its viscosity has never been measured by a standard measuring cup. Water based ink is composed of four different chemical raw materials. They are: pigment, which gives the ink a certain hue so that we can see the color; The resin, after drying, wraps the pigment molecules to form a smooth film; Additive, which is an auxiliary agent to improve the physical and chemical properties of ink. The dosage is not much, but the effect cannot be underestimated; Solvent, it is to reduce the viscosity of water-based ink, so that the ink is easier to transfer to the substrate, and then volatilize and dry. The typical composition of printing ink is: solvent 70%, pigment 10%, additive 5%, resin 15%. The viscosity of water-based ink is very important. Whether changing from one batch of printing activities to another batch of printing activities SF =, or changing from one printing machine to another, or other situations may require different ink viscosity. It depends on several aspects, including different printing models, scrapers, embossing rollers and mesh sizes. The viscosity of water-based ink is easy to measure with a measuring cup, but the temperature change and the cleaning and protection of the measuring cup must be paid attention to during the use of the measuring cup

colorant of water-based ink in today's printing, the main function of ink is to show the color and tone of printed matter, so the most important part of ink is colorant. Pigments are divided into dyes and pigments. Dyes are common color agents. Dyes can be found in food additive pigments and ball point pen inks. Although the printing effect of dye ink is poor and easy to fade, some paper printing and Paperboard Printing are still in use due to low prices. Dryness of water-based ink in terms of drying, water evaporation is a very important factor, especially in non absorbent materials, which can use energy to evaporate the solvent. There are two kinds of water-based ink drying, absorption substrate and non absorption substrate. It is clear that non absorbent substrates such as plastic films do not absorb water. Even the absorbing substrate can only absorb a considerable amount of water, but if the water and resin are not completely absorbed and separated during drying, that is, the water capacity of the substrate is saturated, it will not dry. At this time, if there is grinding, there will be color transfer

pH value of water-based ink in water-based ink is suitable for the batch detection and sorting of springs on the production line. PH value is a very important factor. Lack of control or incorrect pH value will cause many problems. PH value is a method to measure the acidity and alkalinity of solvents. The range of pH value is from 0 to 14. PH value will affect the viscosity of water-based inks. In the classic, it can also be designed as a flexible battery sewn into your clothes type water-based ink. From the curve, it can be seen that the general pH value range should be between 8 and 9. Several simple steps to control the ink: stir it fully before use, detect the ink viscosity when printing on the machine, adjust the viscosity, and then confirm the viscosity and pH value

source: fine chemicals in the 21st century

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