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Factors affecting the color of special color printing

        Why the color of spot color ink printing often goes wrong is generally caused by the incorrect formula of spot color ink. The formula of spot color ink is the most important factor affecting the color of spot color printing. But. Sometimes it is printed with the same spot color formula. Factors affecting the color of special color printing

      The color difference between one batch and another is also very large. Why? This is because in addition to the spot color formula. There are many other factors that affect the color of spot color ink printing.Factors affecting the color of special color printing

Factors affecting the color of special color printing

Ink layer thickness

        Ink layer thickness refers to the thickness of ink deposited on the substrate surface after printing. In spot color printing, sometimes the dot area ratio is used to control the thickness. To get a lighter color.Factors affecting the color of special color printing

       Ink layer thickness is in addition to spot color ink formula. The most important factor affecting spot color printing color. Table 1 and figure 1 are sufficient to illustrate the influence of ink layer thickness on print color.Factors affecting the color of special color printing

       Table 1 shows the color changes of the four inks when the ink layer thickness changes slightly. It can be seen from it. Factors affecting the color of special color printing

       The color difference of 1.5-4.3 △ EAB will be caused by the change of ink layer thickness of about 0.1um. Obviously, this impact is great. Figure 1 shows the relationship between ink layer thickness and print density. Within a certain range. Factors affecting the color of special color printing

       The density increases with the increase of ink layer thickness, and this trend is more obvious in the case of small thickness.Factors affecting the color of special color printing

        In spot color printing. The influence of ink layer thickness on printing color must be fully considered. When preparing spot color ink. Ink layer thickness of proofing. As close as possible to the ink layer thickness in the actual printing.Factors affecting the color of special color printing

        Only in this way can we accurately predict the color of spot color ink after printing. For comparison with the standard color sample. secondly. During printing, the ink layer thickness of one batch of live parts and another batch of live parts, and live parts printed before and after the printing process shall be consistent as much as possible. To reduce the color deviation of spot color.Factors affecting the color of special color printing

Hiding power of ink

        Hiding power is the ability of ink to cover the background color. The better the hiding power, the worse the transparency of the ink. The ink color is less affected by the color of the underlying substrate. The hiding power is related to the concentration of pigment in the ink and the ratio of the refractive index of pigment to that of binder.Factors affecting the color of special color printing

      The hiding power of the ink and the thickness of the ink layer jointly affect the transparency of the ink layer. The stronger the hiding power is, the thicker the ink layer is. The worse the transparency of the ink layer, the less the printing color of the ink is affected by the printing substrate. The printing ink layer of spot color ink is mostly translucent or opaque. Factors affecting the color of special color printing

      When selecting the ink formula, the influence of the opacity of the ink layer on spot color printing should also be considered according to the actual situation. So as to select the formula with appropriate covering power.Factors affecting the color of special color printing

Substrate of bottom layer

      Most of the inks used in printing are transparent or translucent. In this way, the substrate can reflect light and the reflected light enters the human eye through the ink film. Will affect the color of the print. Therefore, the influence of the color of the underlying substrate on the color of the printed matter can not be ignored. In addition. Factors affecting the color of special color printing

      The different absorbency of the substrate to the ink also has an impact on the color of the final print. For example, the effect of the same ink on coated paper and uncoated paper is very different. Therefore. The color of the substrate and the absorption of ink are also important factors affecting the printing color of spot color ink.Factors affecting the color of special color printing

         In order to reduce the influence of this factor on the color of spot color ink, what should be done? The first is to use the same paper as in the actual printing when preparing the ink to make the test color sample; secondly. Factors affecting the color of special color printing

      The indexes of printing paper shall be tested to ensure that the paper quality does not fluctuate too much. In this way, the paper quality remains uniform from the deployment of ink to the end of printing. The influence of substrate on ink color is also controlled.Factors affecting the color of special color printing

       It should be noted that not only the color substrate has an impact on the color of the ink. So is the white substrate. This is because the white substrate also has its hue and lightness. Under the photometer, the color of different white substrates is different. These subtle differences will also affect the color of ink with better transparency.Factors affecting the color of special color printing

       For the printing of translucent or opaque ink on plastic film. The effect of substrate performance on printing color is different from the above. At this time, the unprinted surface of the film is more important. Because the human eye sees the color of the print from this side, the surface properties and brightness of the film. It has become the main factor affecting the color of printing.