Application of gravure printing ink in plastic fle

Application of gravure printing ink in plastic flexible packaging

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

plastic intaglio ink is generally used to print PE, PP, OPP, NY and other plastic films, but it can also print composite flexible packaging. As long as there is no large color block in the printing layout, the smell and fastness after compounding are basically OK after rewinding and cold air inspection. Plastic gravure surface printing ink is mainly made of binder, polyamide resin, pigment and additives after grinding and filtration. But all shareholders of poly will also participate in it, and the softening point of amide resin will be controlled at 121 ℃. Otherwise, due to the low softening point of resin, there will be print adhesion during printing in mildew and rain season. The resin has a high softening point and will freeze in winter. It needs to be heated and mixed to make it melt. The dilution solvents of plastic gravure surface printing ink are toluene, isopropanol, xylene, butanol and so on. 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, it should be noted that if the performance consumption of plastic granulation in China is almost 1.5% higher than that in the UK, the drying is too fast, resulting in the loss of graphic points. The appropriate addition of butanol will improve the reproducibility of the ink and make the small characters and points clear, but if it is added too much, the ink will not dry, especially in the rainy season

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 sandwiched in the inner layer, which is the ink for printing high-grade plastic flexible packaging. The main solvents used for dilution are toluene, acetophenone, butanone and ethyl acetate. Ethyl ketone, toluene and ethyl acetate are fast drying solvents and butanone is slow drying solvent. Alcohol solvents shall not be added to this kind of ink, otherwise the ink will deteriorate. When using plastic gravure composite ink, we should pay attention to it. 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, the choice of ink should be determined by the rotation speed of gravure grid during 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 can't dry

for steaming resistant plastic flexible packaging or printing aluminum foil, select steaming resistant two-component gravure ink and special ink for aluminum foil. Otherwise, it will not have the effect of cooking resistance, and the ink in the composite inner layer will become thin, discolored, unclear graphics and text and so on. In the production of cooking resistant packaging bags, it is also necessary 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 undergo corona treatment to destroy the molecular structure of plastic surface and improve the surface tension of the film to more than 38 dynes, so that the ink and film can be affinity and firmly adhered, 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 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 and 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 short, the selection and application of plastic gravure printing ink should be determined according to many factors such as the performance of different gravure printing machines and the proficiency of operators. We 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 2. Sensor of tensile testing machine: with appropriate ink and materials and careful operation, can we produce exquisite plastic printing products. (Business Express)