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    Home > Coatings News > Paints and Coatings Market > The eight ink problems you must know to do a good job of printing

    The eight ink problems you must know to do a good job of printing

    • Last Update: 2020-12-23
    • Source: Internet
    • Author: User
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    Ink is an important material for printing, it prints pattern text on paper, is an essential material in the printing industry, its performance directly affects the printing quality and productivity of products. Today, let's talk about the eight ink issues that need attention in printing.
    printing is the text, pictures, photographs, anti-counterfeiting and other originals by plate making, inking, pressurized and other processes, so that ink transferred to paper, textiles, plastics, leather, PVC, PC and other material surface, bulk reproduction of the original content of the technology .
    printing is the process of transferring approved printed versions to substations through printing machinery and special inks.
    1, the characteristics of the ink how to determine the amount of emulsion
    the size of ink fluidity, can affect the use of wetting fluid at printing time. In the printing process, one of the reasons for the use of moisturizer is to make it easier for water to form water film in non-printed parts, making ink difficult to expand into these parts.
    assuming that the fluidity of the ink is small, it will spread more slowly on the plate, and the time the ink will stay in the non-printed part will be shorter. In this case, we can use a smaller amount of moisturizer; On the contrary, assuming that the ink is fluid, we should increase the amount of moisturizer appropriately to prevent the ink from sticking in the non-printed part.
    2, ink emulsification will produce any changes
    If the ink emulsification, it will produce the following changes:
    because the emulsified water molecules are running into the ink, the original molecules between the space occupied, so that the volume of ink increased;
    also because water molecules occupy the ink space, so that the ink surface pigment particles occupy a smaller proportion of the area. Because the pigment reflects the color light in the air, and lets us see the color of the ink, so the pigment particles are less, the ink reflects less light, and destroys the color, brightness and saturation of the ink;
    water seeps into the ink, its viscosity decreases.
    3, with emulsified ink printing, what is the problem
    In fact, once the ink is emulsified, its hue, brightness and saturation, will be due to the infiltration of water molecules and damage, so printing with these inks will certainly appear to tone offset problem. Because the saturation of ink is reduced, the amount of ink has to be increased when printing, which will bring another problem of increasing the density value of the field.
    4, how does the viscosity of the ink work in printing
    Viscosity can also be called internal friction or cohesion, from the physical point of view, its force direction is the opposite of the direction of the flow of the liquid, is a resistance to the flow.
    In the case of ink transfer to explain, the viscosity is based on the transfer process, the ink layer of the ink is pulled apart, and in order to counter this pull, and thus there is another intronsographable force, which is viscosity.
    printing often requires inks to have a certain viscosity, so that the ink spread on a flat surface, there is a certain adhesion, so that the dot clear; On the other hand, it can make the surface line speed of the ink roller equal, help the ink to pass evenly and maintain a certain thickness of the ink layer.
    5, sticky too big or too small, what will be the problem
    sticky too big, ink transmission is easy uneven, paper hair and paper powder is easy to peel off, while paper is difficult to peel from the rubber roller, printing quality is greatly affected; And the viscosity is large, ink on the plate will spread slowly, the ink layer on the plate, after a few rotations, the remaining ink layer is not enough to protect the layout, the result will not stand the pressure of printing and the role of the moisturizer, so that the plate easy to flower plate.
    but stick too small, but also will make the ink too easy to emulsify, dirty, so that the printing quality is not good.
    6, what is the role of ink fluidity
    The relationship between fluidity and viscosity is inversely ratio, the greater the fluidity, the lower the viscosity;
    ink flow is good, can be guaranteed to a certain extent the quality of printing, because under the same pressure, ink can be on the surface of the ink roller, easily spread the thickness of the ink film, and maintain a good transfer, so that printing will not appear in the depth of uneven printing.7, ink divided into how many drying methods
    In fact, different inks according to its characteristics and printing methods, will use different methods to dry the ink. Generally not the following:
    ink oxidation: this form of polymer conjunctivation drying, is the main drying form of paper printing;
    permeable drying: when the ink printed on the paper, its connection material will be due to the role of the capillary of the paper fibers, and penetrate into the paper's internal drying;
    drying: when the ink is printed on the paper, only parts of the paper will seep in, but most will be played out.8, why add desiccant in the ink
    When the ink's connection material itself drying capacity, not enough to meet the time requirements of the printing set color, we will add a drying agent in the ink, speed up the drying speed.
    can be combined with antioxidants in inks to eliminate and reduce the reaction of antioxidants. In addition, the drying agent can directly absorb oxygen in the air, making it easier for the ink to obtain the oxygen required for drying, accelerating oxidation drying.
    9, the conclusion
    correct understanding and understanding of the printing needs to pay attention to the ink problem, in the actual production and operation process, according to the characteristics of printing conditions, the appropriate adjustment and improvement of certain properties of the ink, to improve production efficiency and product quality will play a better role.
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