Plastic gravure inks are generally used to print plastic films such as PE, PP, OPP, NY, etc., but can also be used to print composite flexible packaging. As long as the printed plate does not have a large color block after rewinding cold wind test, the composite odor and fastness are still basic Yes. Plastic gravure surface printing ink is mainly made by grinding and filtering by connecting materials, polyamide resin, plus pigments and additives. The softening point of the polyamide resin is controlled at 121 degrees, otherwise the printed product will stick when printing in the rainy season due to the low resin softening point. The resin softening point is high and will freeze during winter use, so it needs to be heated and mixed to make it melt. The dilution solvent of plastic gravure surface printing ink is toluene, isopropyl alcohol, xylene, butanol, etc. You can also add some ester solvents to adjust the viscosity of the ink. Toluene and isopropanol are quick-drying solvents. Xylene and butanol are slow-drying solvents. When using butanol, it should be noted that if the ink dries too fast, resulting in loss of graphic dots, proper addition of butanol makes the ink reproducible, the fine print and dots are clear, but adding more will cause the ink to not dry, especially in the rainy season There will be blocking and anti-sticking of the printed matter.
The ink printed in plastic gravure is also called composite ink, which refers to the ink printed inside the substrate. The connecting material of this ink is mainly chlorinated polypropylene resin, which has high adhesion to printing OPP, PET, NY and other thin films. After compounding, the black ink is sandwiched in the inner layer, which is the ink for printing high-grade plastic soft bags. The main solvents used for its dilution are toluene, ethyl ketone, methyl ethyl ketone and ethyl acetate. Methyl ethyl ketone, toluene, and ethyl acetate are quick-drying solvents, and methyl ethyl ketone is a slow-drying solvent. This type of ink must not add alcohol solvents, otherwise the ink will deteriorate. Pay attention when using plastic gravure compound inks, because ink manufacturers have the difference between high-speed machine quick-drying ink and low-speed machine drying ink when designing ink. The printing speed should be determined by the speed of the gravure printing machine. Otherwise, the speed of the gravure printing machine is slow, and the ink dries in the pits of the gravure dot; the rpm of the gravure printing machine will not dry again. For retort-resistant plastic flexible packaging or printed aluminum foil, two-component gravure ink and aluminum foil special ink for retort resistance should be selected. Otherwise, it will not be able to withstand cooking, and the ink in the inner layer will become thinner, discolored, and the picture and text will not be clear after cooking. In the production of retort-resistant packaging bags, high-temperature resistant materials and retort-resistant two-component compound adhesives must also be selected.
The surface tension of plastic gravure ink is generally 36 dynes, while the surface tension of PE and OPP is generally only about 32 dynes, which requires that the film undergo corona treatment during gravure printing to destroy the molecular structure of the plastic surface and improve the film The surface tension makes it reach 38 dyne or more, so that the ink and the film can be adhered firmly, and the ink can not be peeled off by hand rubbing and the adhesive tape, so as to meet the printing quality requirements. Plastic gravure inks have an impact on the ozone layer during the production of chlorinated polymers. In gravure printing, a large amount of toluene is used to dissolve and adjust the viscosity of the ink, which causes harm to the health and safety of workers. This requires ink manufacturers to develop low Poisonous, non-toxic alcohol-soluble and water-soluble gravure plastic printing ink. We use plastic flexo printing inks in the production of paper-plastic composite rolls (for users to package medicines, tea bags, etc. on their own machines) and in the production of liquid packaging film rolls. This ink is alcohol-soluble, the added solvents are alcohols and esters, and the toxicity is low, which meets the odorless and benzene-free hygiene requirements. In short, the selection and application of plastic gravure printing inks depends on many factors such as the performance of different gravure printing machines and the proficiency of operators. To know what material to print on, what is the speed of the gravure printing machine, how dry the ink is, whether the printing color is consistent with the original, whether the post-press processing meets the requirements and the use of the final product. Choose different inks for different specifications and different plastic flexible packaging bags (films). Only by choosing the right ink and materials, and careful operation, can we produce beautiful plastic printing products.
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