The plastic film used is a flexographic ink

Flexible printing inks used in plastic films are available both at home and abroad. High-grade inks are still known for their foreign inks. The flexo printing inks of the 1980s are suitable for use in printed plastic vests (also known as pouches) for primary flexo presses (such as laminated flexo presses). In the 1990s, great progress was made in the flexo printing process of plastic films. Flexographic inks adapted to high speed, fineness, and high color were successively landed in the domestic market. Ink quality control, in addition to the perception of fineness, color viscosity and other parameters, the author thinks that the color concentration should be emphasized.

Flexographic inks, when printing fine flexographic plates, due to the use of high-line anilox rolls, even if the current anilox roll manufacturing process has undergone great reforms, CO2 laser engraving processes have been unambiguously named by YAG or others. With the laser replaced, the amount of strike ink has been significantly improved, but the anilox roller with a high number of screens also needs high-color ink, but it is still an indisputable fact. Many ink companies in their own production series, in addition to the general product, also specifically provide its ink, or high-density ink, is specifically designed to deal with this situation. However, if the ink used in normal production is overcharged, it exceeds a certain percentage, the resin in the ink is reduced, and the adhesion of the ink to the plastic film is inevitably reduced. Therefore, the ink is not as good as possible. To control a degree.

Choosing and controlling the color intensity of flexographic inks, the author believes that it is essential in process quality control. We feel that using a density meter to measure field density is simple and effective. However, the ink sample scraped on the film by the scraper bar is still different from the actual print process conditions (such as a certain number of lines of anilox roller, a certain density of double-sided adhesive tape, a certain printing speed). This difference must also be noted when the instrument is tested. In addition, when it comes to the residual amount of solvent in printed products, it should also pay attention to the resin used in the selection of flexo ink. Polyamide, nitrocellulose, and PVB have their own strengths, which cannot be ignored. The inks produced by foreign companies for printing on plastics have also been trial-controlled in the domestic market. I have tested such inks and have good performance, but there are still some problems. It is estimated that it will take time to fully replace alcohol inks.