Common reasons that affect the gloss of printed products:
(1) Low-grade ink is used for printing, and the gloss is poor after coloring (except low-grade products).
(2) The surface of the paper is rough, the larger the gap between the fibers, the stronger the absorption capacity of the connecting material. After the ink is transferred to the paper, the connecting material is absorbed by most of the paper fibers without film formation, leaving the ink pigment The particles are attached to the surface of the paper, thus making the product dull and dull.
Approach
How to make the printed products have better gloss, the actual operation experience tells us that the printing gloss can be obtained from the following aspects:
(1) The gloss of the ink itself is the most basic element. When printing high-end fine products, the ink should be printed with high-end quick-drying and bright ink to obtain the best gloss.
(2) Add dry oil to the ink properly during printing to help the good conjunctiva on the surface of the ink, so that the product can obtain a proper gloss. To correctly grasp the performance and dosage of red and white dry oil, the type and dosage of dry oil have a certain influence on the gloss. No. 402 red dry oil is mainly composed of cobalt citrate. The drying effect is based on the surface oxidized conjunctiva. The drying speed is about 23 times that of white dry oil. Generally, it is added in red ink and black ink, and medium blue and deep blue can also be used. Especially in the latter colors of the same kind of printed matter, if the red and dry oil can be added to the maximum, this will have a good effect on increasing the gloss of the printed matter. When the yellow version is used as the first color sequence, it is not advisable to add red dry oil, because the color of the red dry oil will change the hue of the yellow ink, followed by the largest amount of yellow ink, and excessive drying is prone to vitrification. White dry oil is a mixture of metal salts of cobalt, manganese, and lead. It has a comprehensive drying effect, but it is not as strong as red dry oil. The correct amount of white dry oil added will have an effect on increasing the gloss of the printed matter.
(3) Apply varnish or film to the surface of the finished product. Ink is a colloid with a complex structure formed by mixing and grinding pigments, binders and additives. Its properties are mainly determined by the characteristics of the pigments and binders. It completes the drying of printed prints through three forms: volatilization, penetration, and oxidation of the conjunctiva. As the main material for printing, understanding the ink composition, familiarizing with the performance of the ink, and correctly mastering the use of the ink are the necessary conditions to ensure the printing quality.
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