Detailed explanation of gloss and color processing after printing
"Chinese Character Information Processing and Printing Revolution" was rated as a major engineering and technological achievement in China in the 20th century, marking China's successful completion of the second printing technology revolution from lead-type and lead-type printing to phototype offset printing. And the large-scale technological transformation of related industries is almost a thousand years away from China's first printing revolution, which seems to be from engraving printing to the invention of movable type printing.
"In the past thousand years, some traditional industries have disappeared under the impact of new technologies, and the printing industry has always been able to quickly integrate with the new technologies of various dynasties and obtain new development space from the application of new technologies." (From the speech of Director Shi Zongyuan of the General Administration of Press and Publication at the 7th World Printing Congress with the theme of "Challenges of the Knowledge Economy in the 21st Century on the Printing Industry").
Surface purification treatment is to generate strong ionization and excitation of the electrostatic field on the printed matter, which can automatically absorb dust, fluff, accelerate ink oxidation, and impact the surface of the crystallized conjunctiva.
The color and gloss of the printed matter are reflected by the surface of the printing carrier, the thickness of the ink layer, and the degree of ink drying. When the value has been timed, the innovative surface purification treatment technology can improve the print effect and enhance the color and gloss expression of the print.
â‘ Printed surface and color, gloss
The printing surface is the general term for the surface of the printing carrier and the ink layer, and is also the material basis for the color and gloss performance of the printed matter. Today, with the rapid development of modern printing, printing carriers mainly include paper and polymer films.
a, paper
The smoothness and gloss of paper mainly depend on the papermaking raw materials and papermaking process. When the surface smoothness and gloss of the paper are high, do not need to increase the pressure when imprinting. The area of ​​contact with the graphic or text of the printing plate or blanket can be maximized, and the transfer of the dots can be completed more evenly and completely, so that the graphic Clear, rich levels, soft tones, full colors, bright and gratifying.
In order to improve the smoothness and gloss of paper, paper mills apply water-based paint on the surface of the base paper and heat and dry it. Generally speaking, there are two types of heating and drying for water-based paints: hot air drying and dryer drying. Coated paper has great differences in the mechanism and processing method of applying coating to remove moisture. Hot air surface evaporative drying uses hot air to force dry from the surface during the drying stage. Most of the water evaporates through the coating surface. Under the action of heat, the molecular structure of the coating is arranged in an orderly manner to the surface with the evaporation direction. In the drying stage, when the coating is in a wet state, the roller is pressed against the mirror hot drying cylinder for drying. The moisture of the coating is transmitted through the pores of the fiber. Under the action of heat, the molecular structure of the coating also follows the evaporation direction, but appears to the back. Orderly arranged. Regardless of the molecular structure arranged toward the surface or the back, there will always be some more active molecules that are more active under heating conditions, and have considerable energy to break away from the attraction of other molecules and make them multi-directionally complicated in the original row direction or the opposite direction. Disorder movement. When these paint molecules free from intermolecular gravitational free movement reach the working interface of the application roller or casting coating cylinder, the huge pressure generated by the working interface of the application roller or casting coating cylinder forces them to continue to move to escape the coating. The surface stays. This stillness on the surface of the coating corresponds to the rough position where the application roller or cast coating cylinder is cast through chrome plating, but there are still fine lines and bumps, resulting in the absence of molecules when the hot-pressed coating layer dries. As a result of the sequential motion, some slight dents appear on the smooth surface of the paper, or some peaks of powder particles are added, so that different roughness appears. When the light propagates to these rough and rough surfaces that are not noticeable, the uneven surface changes the reflection angle and weakens the visual signal from the paper surface, that is, the gloss is not strong.
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