Analyze the influence of printing ink on paper from three aspects
1. The whiteness of paper affects the whiteness of paper: â‘ The whiteness of pulp: the most important influencing factor. â‘¡Dye: Select the dye so that it does not affect its reflectivity near the main wavelength of measuring whiteness, that is, it does not affect the whiteness of the paper. â‘¢ Filler: depends on its type and grade. â‘£ Paint: The whiteness of the printing paper is determined by the whiteness of the base paper, the whiteness of the paint, and the coating amount. Papers with different whiteness and a certain color (such as blue paper or yellow paper) have different effects on the color of the printed ink layer. For the same kind of whiteboard paper, the whiteness is different, especially for the color with a higher lightness value, the effect is particularly obvious, resulting in a large difference in the ratio of spot color inks. Therefore, in actual production, paper with the same whiteness should be used for printing to reduce the influence of whiteness on the printing color.
2. The smoothness and glossiness of the paper have a direct relationship between the glossiness of the paper and the glossiness of the printed matter in terms of the impact on the printing quality. No matter what type of ink, the glossiness of the printed matter varies with the paper itself The gloss is improved. The gloss of the paper is directly related to the inking efficiency of the paper. A paper with a high gloss can obtain a higher printing density at the same ink film thickness as a paper with a lower gloss. Therefore, there is a close correlation between the gloss of the printed matter and the gloss of the paper itself.
3. Ink acceptance performance and absorption performance of paper Ink acceptance performance refers to the ability of the surface of the paper to receive the transferred ink at the moment of imprinting on the printing machine during the printing process. It is closely related to the three aspects of paper performance: the ability of the paper surface to receive printing ink wetting; the ability of the paper surface to absorb certain ink components; the ability of the paper surface to fix and retain a uniform ink film. The paper's ability to absorb ink occurs over a long period of time from the contact of the ink with the paper until it is fully cured on the surface of the paper. It absorbs the low-viscosity components in the ink and certain components of the ink to the paper Related to internal osmosis. Printing pressure, printing time, ink viscosity, and paper capillary radius all affect the paper's ability to absorb ink. When the same ink is printed on paper with different absorption under the same conditions, there will be different printing densities. There is a pore structure formed by anisotropic and multi-phase complex structural elements on the paper surface. In order to obtain good uniformity and smoothness on the paper surface, coatings of different thicknesses are generally applied on the paper surface. The nature and thickness of the coating determine the ink absorption capacity of the paper surface. The different absorption capabilities result in differences in the color of the printed ink layer.
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