A kind of gravure back coating ink and its preparation method and application

Abstract

The invention provides a kind of gravure back-coating ink and its preparation method and application, belonging to the field of printing technology. The gravure back-coating ink provided by the invention comprises the raw materials of the following components: polyethylene wax, polyvinyl alcohol, styrene- Acrylic acid copolymer, sodium dioctyl sulfosuccinate, silicon dioxide and solvent. The invention can effectively improve the internal lubricity of the gravure back-coating ink and improve the dispersion of silicon dioxide by adding polyethylene wax, styrene-acrylic acid copolymer, and sodium dioctyl succinate sulfonate to the components of the traditional water-based back-coating ink It has anti-sedimentation effect, gravure back-coated ink changes the moisture content of the paper, fills the fiber gaps on the back of the paper, and inhibits the paper from warping and deformation; at the same time, a thin surface layer with gaps between microcrystalline particles is formed to maintain air retention and prevent It prevents the generation of vacuum phenomenon, thereby eliminating the occurrence of paper sticking and sticking phenomenon.

Description

technical field [0001] The invention relates to the technical field of printing, in particular to a gravure back-coating ink and a preparation method and application thereof. Background technique [0002] During the paper printing process, the moisture content (that is, the degree of dryness), the printing ink level and the pressure of the printing roller will all affect the flatness and warping degree of the paper after printing. Specifically, due to the single-sided printing of the paper, under the action of drying and plate roller pressure, the moisture in the paper evaporates until the moisture content of the printed sheet is lower than 4.5%. The paper is curled and deformed. If the paper is deformed, it will easily lead to uneven delivery, causing the needle position of the printing machine to jump and register poorly, and the reject rate is high. [0003] In the prior art, the degree of deformation of the paper is slowed down through the back coating process. Howeve...

AI Technical Summary

Problems solved by technology

However, the traditional back-coating ink is only for the purpose of improving paper warping and deformation, ignoring that back-coating can easily fill the fiber gap on the back of the paper, resulting in a significant improvement in the smoothness of the back of the paper, resulting in a very small gap between the back of the upper paper and the front of the lower paper, and the air is exhausted. Causes tight fit and inconvenient post-process paper feeding

For example, Lingying PG-2105I water-based back coating, its composition is polyvinyl alcohol 5-10wt%, silicon dioxide 0-0.5wt%, ethanol 1-10wt% and water 50-90wt%, the ink is emulsified with polyvinyl alcohol The dispersion of silicon dioxide is not good, and sedimentation occurs; and when printing, all the silicon dioxide is filled into the paper fiber gap, forming a flat back-coated thin layer, which makes the paper flatness too high, and the air between the papers in the delivery process If the paper is exhausted, the paper will be closely bonded under the action of pressure, resulting in paper sticking, which will affect the subsequent process of paper feeding

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