How to choose and use the screen printing ink

How to choose and use the screen printing ink
As the screen printing process uses a wide range of inputs less difficult for other printing methods of printing substrates, using screen printing, silk screen process and therefore the last decade have developed rapidly. Screen printing process brought about by the characteristics of such a fine, in addition to the diversification of printing equipment, there are multi-functional, multi-purpose screen printing inks. Therefore the correct choice and use of silk screen printing ink than other alternative methods (gravure, letterpress, lithography, soft version) is all the more important. The choice of screen printing ink printing ink and the use of wire and other types of ink are the same as pigments, resins, solvents, additives mixed grinding together.
1. By dry methods can be divided into: steam dry type - through solvent evaporation method to make ink film adhesion. Oxidative polymerization type - oxidation reaction through the ink film adhesion method. Second liquid reaction type -through the two-component chemical reaction so that the ink film adhesion method. UV-curing type, through ultraviolet radiation caused by a chemical reaction so that the ink film adhesion method. Different drying methods can be brought about by the printing ink after the ink gloss film different, different resistance (mechanical resistance, chemical resistance, weather-resistant performance), using different drying equipment, resulting in different costs, and thus the user need to choose carefully.
2. According to the type of ink can also be expected to link into many types, but different ink manufacturers of the selected resin is different from the general category can be divided into epoxy resin, polyurethane type, polyester, vinyl, acrylic, rubber category and so on. Only clear substrates of different materials in order to choose different types of ink resin in order to avoid errors caused by ink adhesion adverse consequences. Not clear material substrates, preferably by printing test before deciding on the choice of ink.
3. Drawbench: The reason is that high viscosity, fast drying, ink and solvent used in resin caused by mis-match, you should use a suitable solvent, appropriate adjustment or replacement of the fine ink viscosity.
4. Migration, faded: The reason is that improper use of pigment ink, especially a large number of plasticizers soft membrane, more susceptible to migration, should use the appropriate ink.
5. White or printed there is mist: The reason is that diluent containing water, ambient air humidity printing, or printing ink in itself bad. Due to the printing surface drying, the solvent evaporation will absorb the surrounding heat, causing water vapor partial solidification in the ink inside the membrane or surface of cause and should therefore select the appropriate drying rate or reduce the space humidity, or the replacement of good ink. Curing agent, driers, stressed the use of Mexican oil. 1. Curing agent, driers should be based on the proportion of accurate use to add, otherwise the ink will increase the crust, resulting in an undesirable effect adhesion. 2. Transfer ink oil normally used for gold, silver ink production, increase the transparency of ink film, ink film gloss enhanced membrane mask, such as the role of Mexico, Mexico's accession to transfer the oil, after adding an appropriate proportion should be thinner to prevent adverse effects printing.
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