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What are the main factors of spot-color ink color

Source:Shanghai KS Printing Co.,Ltd     Time:2016-08-05 Hits:

From the paper point of view, factors that affect the color of the color ink probably three ways: 1, whiteness absorbent paper, paper gloss and smoothness, author expand factors affect the ink color detail on these points factor.


1, whiteness
    Whiteness different (or with a certain color) paper, there are different effects on the printing ink colors appear. For the same kind of white paper, the brightness is different, color difference printing ink layer is mainly reflected in the number of spot color ink black ink composition, especially for color lightness of 70 or more, affecting particularly significant, resulting in spot color ink the ratio varies greatly. Therefore, in the actual production should try to use the same whiteness of paper printing, to reduce the impact of printing paper white color.
    2, absorbent paper
    When the same kind of ink under the same premise printed onto different absorbent paper, have different print gloss. Determines the structure of the paper surface of the paper there are irregularities formed of plant fibers and pores, in order to get a good paper smoothness and uniformity, generally applied to the surface of the paper coatings of different thicknesses. The nature and thickness of the coating of paper table facing the ink absorption capacity. Different absorption capacity, will make a difference color printing ink. Uncoated paper and coated paper compared, black ink will appear dark, dull, and the color ink will drift by cyan ink and magenta color ink deployment of a performance of the most significant.
    3, paper gloss and smoothness
    Gloss print gloss and smoothness depends on the paper. Printing paper surface is semi-glossy surface, especially coated paper.
    On color prints, when the light incident angles of 45 ° to the surface of the paper, about 4% of the light is reflected off the surface of the first floor which is reflected light. While the rest of the incident light passes through the ink layer, the ink through after the selective absorption, reflection and then out through the ink into the eye, perceived by the human eye, which is what we observed color. If the gloss and smoothness of the paper is high, the first floor surface reflection light is made specular reflection, not easy to enter the human eye, when observed through the ink color is reflected basic colors. If the paper surface rough, low gloss, the first floor surface will reflect light diffusely reflected, at this time we see the color is mixed color shade and the first floor of the main surface reflected light produced. Because it contains white light points, thus reducing the saturation of the main shade, so people feel lighter color when viewed printing, reduce the density value measured by a densitometer, the brightness increases.



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