Factors influencing the fineness of the most popul

2022-08-02
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Factors influencing the fineness of flexo printing products in recent years, with the application of CDI technology in the flexo printing industry, flexo printing products have got rid of the image of poor printing quality and fineness in the early stage, and gradually impacted on the medium and high-end markets. Nowadays, many flexo printing manufacturers can produce exquisite products that are compared with traditional offset printing and gravure printing. The application scope of the products has also been extended from the early low-grade packaging bags, cartons and corrugated paper to cigarette labels, wine labels, high fidelity packaging, films, fine corrugated paper, milk bags and other fields. But simply having digital flexo does not mean having high-precision flexo printing quality. Many manufacturers reported that even if high-quality digital flexo was used, the product fineness did not achieve the expected effect

influence of substrate on product fineness

after long-distance transportation and long-time stacking, the moisture content of various coated papers with a quantitative content of less than 90g/m2 will change greatly with the surrounding environment. In addition, the flexographic machine has a long paper path, which must be dried by the multi-color unit. If it is thin paper, it will be deformed for many times and the deformation direction is inconsistent, which has a great impact on the quality of products with multi-color overprint. Therefore, the paper supplier must strictly control the moisture content of the paper, shorten the transportation cycle as far as possible, and avoid exposure to the sun or staying too long in rainy weather during transportation. These measures are the premise of controlling the product fineness in the printing process

influence of ink on product fineness

fine printing usually needs to meet the following quality requirements:

(1) the field is flat and fine, and the surrounding is neat without double shadow

(2) clear points, small deformation and distinct layers

(3) if there are thin lines and small words, the lines shall be clear, the words shall be exquisite, and the version shall not be pasted

(4) multicolor overprinting requires accurate overprinting without white leakage and too many overlapping borders

on the premise that the printing pressure has been adjusted in place, adjust the ink performance to maintain stable viscosity and good printability, so that the printed matter can meet the above four requirements

generally, the viscosity of the ink used in field products is 45` ~ 60` (paint 4\; cup), and the ink leveling and covering power in this viscosity range are both available. Ink covering power is good, and the field is flat; The ink has good leveling property, and the field is fine and glossy. The viscosity of the ink used in the line products is better at 30 ` -40 ` (coating 4\; cup). The ink transfer performance in this viscosity range is good, the point-to-point reproducibility is continuously strengthened, and the recognition of the brand of enterprises in the industry is strengthened. The raw materials of the lunch box should meet the food safety standard of gb4806.6. The printed product points are clear, the deformation is small, and it is not easy to paste and dirty. For multi-color overprint products, the trapping parameters shall be designed to the minimum on the premise that the overprint does not leak white, and the printing color sequence shall be reasonably arranged to ensure that the ink color printed by the latter color covers the trapping of the former color

influence of printing process on product fineness

setting of printing process: for example, setting of trapping parameters, front and back arrangement of printing color sequence, embossing, marks set for subsequent processes when bronzing cannot be online, etc

compared with offset printing and gravure printing, the overprint accuracy of flexo printing machine is poor. If the products to be printed have to be bronzed, embossed and other post processes, and can not be connected with the flexographic press by changing the proportion sequence of PVC and CPE consumption, marking on the printing plate in advance is the premise to ensure the accuracy of the post process, and it is also the key to ensure whether the products are exquisite after packaging. Whether the product printing is appropriate and perfect after packaging and processing is an important aspect to reflect the product fineness

in a word, the improvement of the fineness of flexo printing products is not only directly related to the printing equipment and plate making, but also more closely related to the substrate selection, ink adjustment, printing process and printing operation level in the printing process

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reprinted from: Jiagong electromechanical

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