Application of the hottest gravure printing ink in

2022-08-16
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The application of gravure printing ink in plastic flexible packaging

gravure printing ink refers to the ink used when gravure printing machines print various substrates. It is also divided into paper gravure printing ink and plastic gravure printing ink. In plastic gravure printing inks, there are surface gravure printing inks and internal composite printing inks

plastic intaglio ink is generally used for printing PE, PP, OPP, NY and other plastic films, but it can also be used for printing composite flexible packaging. As long as there is no large color block on the printing page, after rewinding and cold air inspection, the smell and fastness of the composite are basically OK. Plastic gravure surface printing inks are mainly made of binders, polyamide resins, pigments and additives after grinding and filtration. The softening point of polyamide resin shall be controlled at 121 ℃, otherwise, due to the low softening point of resin, printing adhesion will occur during printing in the rainy season. The resin with high softening point will freeze in winter, so it needs to be heated and mixed to make it melt. The diluting solvents of plastic gravure surface printing ink are toluene, isopropanol, xylene, butanol, etc. Some ester solvents can also be added in time to adjust the viscosity of the ink. Toluene and isopropanol are fast drying solvents. Xylene and butanol are slow drying solvents. When using butanol, you should pay attention to that if the ink dries too fast, resulting in the loss of graphic dots, adding butanol appropriately will improve the reproducibility of the ink, and the small characters and dots are clear, but adding too much will cause the ink to dry, especially in the plum rain season, there will be print adhesion

plastic intaglio printing ink, also known as composite ink, refers to the ink printed in the substrate. The binder of this ink is mainly chlorinated polypropylene resin, which has high adhesion to printing OPP, pet, NY and other films. After compounding, the black ink is clamped in the inner layer, which is the ink for printing high-grade plastic soft bags. The main solvents used for dilution are toluene, acetophenone, butanone and ethyl acetate. Ethyl ketone, toluene and ethyl acetate are fast drying solvents, while butanone is slow drying solvent. Alcohol solvents should not be added to this kind of ink, otherwise the ink will deteriorate. Pay attention when using plastic gravure composite ink, because the ink manufacturer has the difference between fast drying ink of high-speed machine and slow drying ink of low-speed machine when designing ink, so the choice of ink should be determined by the rotation speed of gravure machine when printing, otherwise, the rotation speed of gravure machine is slow, and the ink dries in the pit of gravure point; The gravure printing machine rotates fast and the printed parts cannot dry

for steaming resistant plastic flexible packaging or printing aluminum foil, we should choose steaming resistant two-component gravure ink and special ink for aluminum foil. Otherwise, it will not be able to resist cooking, and the ink in the inner layer of the composite will become thin, discolored, and the graphics and texts are not clear after cooking. In the production of cooking resistant packaging bags, we also need to choose high temperature resistant materials and cooking resistant two-component composite glue

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 during gravure printing, the film should be corona treated to destroy the molecular structure of the plastic surface and improve the surface tension of the film to more than 38 dynes, which makes our country too backward. The ink and film are compatible and firmly adhered, and the ink cannot be torn off by hand and adhesive tape, so as to meet the printing quality requirements

due to the influence of chlorinated polymer on the ozone layer in the production of plastic gravure printing ink, toluene is widely used in gravure printing to dissolve and adjust the viscosity of the ink, which is harmful to the health and safety of workers. This requires the ink manufacturer to develop low toxicity, non-toxic alcohol soluble and water-soluble Gravure plastic printing ink as soon as possible. We use plastic flexographic ink in the production of paper plastic composite coiled materials (for users to pack drugs, tea bags, etc.) and liquid packaging film coiled materials. The added solvents are alcohols and esters, which have low toxicity and meet the hygienic requirements of tasteless and benzene free

in a word, the selection and application of plastic gravure printing ink should be based on many factors such as the performance of different gravure printing machines and the proficiency of operators. You need to know what material to print on, how fast the gravure perfection machine is, how dry the ink guide is, whether the printing color is consistent with the original, whether the post press processing meets the requirements and the purpose of the final product. Different inks should be used for plastic flexible packaging bags (films) with different specifications and a large number of stainless steel trading enterprises. Only by choosing the right ink and materials, combined with careful operation, can we produce exquisite plastic printing products

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