Popularization and Application of Screen Printing Ink

         At present, screen printing inks in the world are developing in the direction of fast drying, non-toxic and pollution-free. Of course, the development of screen printing ink depends on the expansion of screen printing application field.Popularization and Application of Screen Printing Ink

       Now the application of screen printing technology has been extended to the printing fields of packaging and decoration industry, advertising industry and building materials industry. Popularization and Application of Screen Printing Ink

      This requires that screen printing ink must meet the development needs of screen printing to large-scale, multi-color and combined printing. Popularization and Application of Screen Printing Ink

       For example, screen printing and offset printing Gravure printing or flexographic printing are combined to form a rubber wire printing press (i.e. offset silk screen combined printing press) or a flexible wire printing press (i.e. flexographic silk screen combined printing machine). Popularization and Application of Screen Printing Ink

      Due to the production of rubber silk screen printing or flexographic silk screen printing machine, the screen printing ink is required to have a certain drying speed. Popularization and Application of Screen Printing Ink

       In addition, at present, most of the combined printing methods are used for packaging printing, so the ink is required to be non-toxic.Popularization and Application of Screen Printing Ink

        Tasteless and pollution-free to meet the “green” requirements of the above screen printing development There are three kinds of inks, one is screen printing water-based ink, the other two are ultraviolet light curing ink and electron beam radiation curing ink.Popularization and Application of Screen Printing Ink

        Screen printing water-based ink is also known as screen printing water-based ink. Its English name is water base screen printing ink. As the name suggests, water-based ink is a water-based ink system.  Popularization and Application of Screen Printing Ink

        Compared with solvent-based ink, it does not contain solvent, non-toxic, tasteless, pollution-free, and meets the requirements of environmental protection.Popularization and Application of Screen Printing Ink

        At present, screen printing solvent inks contain 50% – 60% volatile components. If the diluent required to allocate ink viscosity is also included, the total content of volatile components emitted by the ink during printing drying is 70% – 80%.Popularization and Application of Screen Printing Ink

      The volatilization of these organic solvents will not only have adverse effects on the environment, but also do some harm to human health. There is no doubt that screen printing water-based ink will be vigorously developed and continuously promoted.Popularization and Application of Screen Printing Ink

1、 Screen printing water-based ink

      The binder of water-based ink is composed of aqueous colloidal or semi colloidal solvent and emulsion. A stable binder is obtained by dissolving acrylate and copolymer in water in an accurate ratio and adding other solvents. Adding pigment and auxiliary materials to the binder can produce screen printing water-based ink.Popularization and Application of Screen Printing Ink

       The particles of the composite have this characteristic, that is, in the process of forming the ink layer film, the water can be volatilized and released quite quickly, so a dry ink film is formed. The viscosity of water-based ink for screen printing can be adjusted with water, the used screen can be cleaned with water, and the ink dry traces left on the screen can be removed and recycled with a cleaning machine. Popularization and Application of Screen Printing Ink

       However, the use of water-based ink requires that the screen printing plate must have water resistance, so the water-resistant sexy light glue must be used to make the plate.Popularization and Application of Screen Printing Ink

       As mentioned earlier, because screen printing water-based ink contains synthetic particles in the ink, the surface of the ink film can dry rapidly when its water evaporates and releases quickly. Therefore, under the standard room temperature of 20 ℃ – 22 ℃ and the relative humidity of 5% – 60%, it is best to use hot air to accelerate the volatilization of water, especially the non absorbent substrate. Popularization and Application of Screen Printing Ink

       Continuous drying device shall be adopted for soft or hard polyvinyl chloride and foil coated with self-adhesive. The temperature of convective air at the inlet shall be maintained at 70 ℃ – 80 ℃, so that the drying temperature of printed matter input by stacking is close to 35 ℃ – 40 ℃. Popularization and Application of Screen Printing Ink

       For substrates of different materials, the drying temperature should be adjusted accordingly to obtain better ink adhesion than solvent based ink. In addition, another measure to improve the drying performance of screen printing water-based ink is to add a small amount of crosslinking agent before printing processing to improve the anti diluent, alkali and acid properties of this water-containing system.