Application of the most popular gravure printing i

2022-07-28
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Application of intaglio printing ink in plastic flexible packaging

plastic intaglio printing 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 plate through rewinding cold air inspection, the composite smell and fastness are basically OK. Plastic gravure surface printing ink is mainly made of binder, polyamide resin, pigments and additives after grinding and filtering. The softening point of polyamide resin shall be controlled at 121 degrees. Otherwise, due to the low softening point of the resin, printing adhesion will occur during printing in mildew and rain seasons. The resin with high softening point will freeze in winter, so it needs to be heated and mixed until the sample is damaged to make it melt. The diluting solvent of plastic gravure surface printing ink is toluene, isopropanol, xylene, butanol, etc. You can also add some ester solvents to adjust the viscosity of the ink. Toluene and isopropanol are fast 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 the loss of graphic points, the appropriate addition of butanol will make the ink reproducible and the small characters and points clear, but too much will cause the ink not to dry, especially in the mildew and rain season, the printed matter will adhere and anti stick

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 thin 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. Methyl ethyl ketone, toluene and ethyl acetate are fast drying solvents, while butanone is slow drying solvent. Do not add alcohol solvent to this kind of ink, otherwise the ink will deteriorate. Attention should be paid to the use of more and more powerful plastic gravure composite inks, because ink manufacturers have the difference between high-speed machine and low-speed machine when designing inks. When printing, the choice of ink should be determined by the rotation speed of the gravure printing machine. Otherwise, the rotation speed of the gravure printing machine is slow and the ink dries in the pit of the gravure point; Gravure printing machine speed fast printing parts can not 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 after compounding will become thin, discolored, and the picture and text are not clear. In the production of cooking resistant packaging bags, it is also necessary to select high-temperature resistant materials and cooking resistant two-component composite adhesive

the surface tension of plastic intaglio printing ink is generally 36 dynes, while the surface tension of PE and OPP is generally only about 32 dynes, which requires that during intaglio printing, the film should be corona treated to destroy the molecular structure of the plastic surface, improve the film surface tension to more than 38 dynes, make the ink and film affinity and stick firmly, and the ink can not be torn off by hand rubbing 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 to dissolve and adjust the viscosity of the ink during gravure printing. Intellectualization has become an important direction of the development of the plastic industry, which will harm the health and safety of workers. According to WSU, the ink manufacturer is required 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 and make tea in bags) and liquid packaging film coiled materials. This ink is alcohol soluble. The added solvents are alcohols and esters. It has low toxicity and meets the hygienic requirements of tasteless and benzene free. In a word, the selection and application of plastic gravure printing ink should be based on the performance of different gravure printing machines and the proficiency of operators. You should know what material to print on, how fast the gravure press is, how dry the ink 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 selected for different specifications and different plastic flexible packaging bags (films). Only by selecting the appropriate ink and materials, combined with careful operation, can we produce exquisite plastic printing products

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