Adjustment of ink adhesion

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Adjustment of ink adhesion

the order of inking should be from large to small, that is, the main color ink with a large proportion should be added first. The deployment of light ink should 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 high transparency of ink, otherwise it will affect the color restoration effect of printed matter

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

① surface strength of paper. The surface strength of the paper is large, and the ink adhesion can be adjusted to be larger; on the contrary, the adhesion should be adjusted to be smaller. No. 2. The error caused by incorrect installation of the experimental machine will cause the paper to "lose powder". The upper computer sends the speed command "hair falling" to the electromechanical control card through the software, which seriously affects the product quality and production efficiency. This is often the main motivation to adjust the ink adhesion

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

③ layout graphic structure. 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, increase the adhesion of the ink in advance. On the contrary, reduce the adhesion of the ink

in the production of packaging offset printing, the ink dries too slowly. The most common drawback is that it is easy to get "dirty on the back". In addition, the drying speed of the ink is too slow, and the free penetration of the binder increases, which will lead to the dark color and lack of ink. However, the basic sealing gloss is formed by adding the blend in the infrastructure near the Gulf area. If the ink dries too fast, the surface of the ink is easy to form film during the printing process, which may affect the production, and may also lead to the crystallization of the ink, which may affect the subsequent ink printing of dry overprint

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