How to adjust the adhesion of ink in the hottest p

How to adjust the adhesion of ink in printing

the order of inking should be from large to small, that is, the main color ink with a large proportion should be added first. For the deployment of light ink, first put diluent, and then gradually add dark ink to the diluent. There are two methods of mixing ink: mixing a small amount of ink by hand; A large amount of ink should be mixed mechanically

the hiding power of ink refers to the ability of ink to cover the background color. The stronger the hiding power, the lower the transparency of the ink. Four color color printing requires the ink to have high transparency, and the size should be able to cover the lower jaw, otherwise it will affect the color of the print. How many times determines the life color restoration effect

in printing, the adhesion of ink is adjusted according to the following factors:

① the surface strength of paper. The surface strength of the paper is large, and the ink adhesion can be adjusted more; on the contrary, the adhesion should be adjusted less, otherwise the paper "drops powder". "Hair loss" is very serious, which seriously affects product quality and production efficiency, which is often the main motivation to adjust ink adhesion

② printing speed. When the speed is fast, the requirements for adhesive deployment are smaller, otherwise, it is larger. The faster the speed is, the more prone it is to "galling" and uneven ink transfer. It is necessary to reduce the adhesion to adapt to it

③ graphic structure of the layout. When printing eye-catching images, the most important thing is that the shape and area of the points should be copied correctly, and the adhesion should be adjusted more. When printing field images, you want to get a uniform and thick field, and since there is no point increase problem, the adhesion should be adjusted less

④ workshop temperature. As the temperature increases, the cohesion of the ink will decrease, which is more likely to cause problems such as increased emulsification and dot increase rate. When adjusting the ink, the adhesion of the ink should be increased in advance. On the contrary, reduce the adhesion of the ink

in the production of packaging offset printing, the ink drying is too slow, and the most common drawback is that it is easy to get "dirty on the back". In addition, the ink drying speed is too slow, and the free penetration of the binder increases, which will lead to the dark color and lack of gloss. If the ink dries too fast, the surface of the ink is easy to form film during the printing process, which affects the progress of production, and may also lead to the crystallization of the ink, affecting the subsequent ink printing of dry overprint

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