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    Home > Coatings News > Coating Technologies > [Information of the Tu Society] What performance testing does the ink need to do?

    [Information of the Tu Society] What performance testing does the ink need to do?

    • Last Update: 2021-06-10
    • Source: Internet
    • Author: User
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    Guide: Ink is an important material for printing.
    It displays patterns and text on the substrate through printing or inkjet.
    The quality of the ink directly affects the correctness and stability of the color of the printed product.
    This article shares the correctness and stability of the color of the printed product.
    The detection of hue, tinting strength, and lightfastness can realize the control of the color quality parameters of the ink and eliminate the color cast from the source.

    Ink is a homogeneous mixture composed of colored bodies (such as pigments, dyes, etc.
    ), binders, filling (filling) materials, additional materials, etc.
    ; it can be printed and dried on the printed body; it is colored and has a certain flow Degree of paste-like glue.

    1.
    Ink hue and tinting strength.
    Hue and tinting strength are the basic items of ink detection, and they have a great influence on the color of ink.

    Hue is the specific feature of ink color, which corresponds to light of a certain wavelength and frequency optically.
    For example, red, yellow, and blue refer to the hue of ink.

    Coloring power refers to the degree to which one ink affects the color change of another ink.

    When mixing spot color inks, when the hue of one of the original inks changes, the color of the spot color ink will change.

    For example, when the color of the original ink is more yellow than before, the blended spot color ink will have the effect of increasing yellow; if the coloring power of the red original ink is stronger, it will have the effect of increasing red.

    When this color deviation exceeds a certain range, it can be found by visual inspection, which leads to customer complaints.

    Therefore, it is very important to control the color of printed products to ensure the correctness of the hue of the printing ink and the stability of the tinting strength.

    2.
    For hue detection, the viscosity of newly provided ink is generally adjusted to the viscosity of the machine, proofed with a printing machine, and printed out the color sample of the ink with a solid plate, or put the ink on the color development wheel with adjusted pressure Drop a few drops, drag it on the surface of the substrate with a certain pressure and speed, and display a ribbon as a color sample.

    Observe the effect of these samples.
    If the ink layer is uniform and smooth, well colored, with a certain gloss, thick ink, and the same color, the standard color card provided by the supplier is basically the same, then the hue of the ink meets the requirements.

    3.
    Coloring power detection Ink coloring power detection uses white ink as a reference color sample, and judges the strength of its coloring power through the degree of influence of a certain ink on the white ink.

    The coloring power test is to add the ink to be tested and the standard color ink in a small beaker, stir evenly and then make a plate, and then compare with the standard coloring power color sample to judge the strength of the ink coloring power.

    After finishing the tinting strength and hue test, remember to keep the wet and dry color samples during the test, especially the wet and dry color samples of the standard ink must be sealed and marked for the next test.
    When used.

    4.
    Ink viscosity detection The method of detecting viscosity is also very simple.
    The specific operation method is: first stir the ink evenly, then immerse the viscosity cup in the ink, and then lift the viscosity cup at a uniform speed.

    When the viscosity cup is just pulled out of the ink surface, press the stopwatch to count the time to watch the ink flow; when the ink just has a cut-off point, press the stopwatch immediately.

    At this time, the time value on the stopwatch represents the viscosity of the ink.

    High viscosity, large seconds; low viscosity, few seconds.

    Due to different temperatures, the viscosity of the ink will also change accordingly.
    Therefore, the general detection temperature is fixed at 25°C.

    It is worth mentioning that there is no obvious correlation between the temperature and the color of the ink, but it will have some influence on the performance of the ink when it is printed on the machine.

    5.
    Ink light fastness test The light fastness of ink refers to the performance of ink to maintain stable color after exposure to light.

    The ink with poor light resistance will fade after a period of light exposure.

    Some printed matter meets the requirements when printed in a printing factory, but after a period of use at the customer's place, color shift will occur.
    This is mostly the reason.

    This article is an English version of an article which is originally in the Chinese language on echemi.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to service@echemi.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.
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