Plastic packaging printing ink how to choose, and how to improve the printing effect?

For printing plastic bags and paper printing is different, get rid of the pretreatment of the previously mentioned, another problem is the film surface smooth, can't let the ink penetration into it. Paper although looks smooth, but in fact the appearance is not smooth, can let the ink into, so conducive to ink adjustable drab film, but also to the adhesive of the ink and paper appearance. So how plastic packaging printing ink selection, how to improve the printing effect? Professional manufacturer of flexible packaging packaging is read to you. Want to consider the following factors, select ink, 1, thermal distortion point and heat resistance assumes that choosing type drying inks, consider one of the biggest ink drying temperature and the temperature of the plastic can withstand is undesirable. 2, solvent resistance of plastic film have certain solubility in the solvent, help with plastic film adhesive ink, but assumes that effect is strong, are likely to decline film mechanical properties. 3, plasticizer and other additives, some plastic film containing a certain amount of plasticizer and other additives, these materials are often able to migrate to the appearance of plastic film and ultimately to soften ink, damage bonding. 4, and other elements of the rigid plastic film, brittleness, standard stability and expansion coefficient and other factors will influence the durability of the printing ink adhesion. Second, how to improve the effect of plastic film printing printing ink is composed of pigment, links, stuffing the composition such as uniform mixture of pulp colloid. As a kind of viscous fluid ink, due to the different varieties, function also vary, which has the branch of thick thin; The cohesive strength, drying speed and inequality. Therefore, correct understanding and understanding of the effects of composition on ink printing ink, about accurately adjust ink features, film printing quality has very important meaning. 1, the pigment ink including pigments and dyes. Printing ink of non-ferrous materials are generally used in paint, useful also some dyes, they are all very fine particles of non-ferrous material. Paint does not dissolve in water, also do not dissolve in connection, most floating condition of share out bonus in solution; And the dye in the join guess is usually soluble. Ink of relative density, transparency, heat resistance, light fastness and resistance of chemical resistance, are related to paint. The color of it choose the ink color; How much the amount of it determine the concentration of ink; The use of it to a certain extent affect the monotonicity of ink, oxidative polymerization drying of printing ink was particularly. 2, connecting link material is a kind of has a certain viscosity, viscosity of fluid. The effect of it is multifaceted. As a carrier of the pigments have mix powdered pigments such as solid particles linked, and the adhesion of paint, after all, can be attached on the printing quality. Connection material quality is good or bad will directly affect the gloss, abrasion resistance and viscosity of liquid. 3, the use of auxiliary additives will be more effectively applied to printing. Commonly used additives have weaken agent, additives, to adhesive, adhesive, ink didn't wait. So have good printing eligibility, printing ink adhesion strong dispersion, and additives are inseparable.