Solution to electrostatic failure in flexo printing

Solution to electrostatic failure in flexo printing

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Static electricity refers to static electricity generated during high-speed start-up production. Once the thin paper products generate static electricity, it is very troublesome for cutting in the next process. After the paper has been die-cut, the finished product tends to go down against the bottom roller, sometimes falling off, and sometimes just between the bottom roller and the front end of the delivery tray. When it falls, it will cause a small amount of waste. If the paper is stuck, it will be shut down and it will cause waste. The main reason for the above problems: the thinness of the tissue itself is poor, and it is easy to generate static electricity. The solution is to install an effective static elimination device in front of the die-cutting unit; a thin steel plate fixed at the front end of the paper-receiving table against the surface of the paper roll and ensuring a tight seam. Sometimes, the thin paper product will fly up along with the die-cutting roller on the delivery table. The main reason is that the varnish is not cured thoroughly and is a little sticky. At this time, it is only necessary to improve the curing performance of the varnish, and the die-cutting can be changed frequently. Sponge lining or adding a small amount of talcum powder, to increase the amount of hard work, the most fundamental is to ensure that the varnish is fully cured and not sticky.

Die cutting and delivery problems are registration problems. It should be said that the tension control of the unit type flexo press when printing thin paper is much easier than when printing paper jams. According to many years of experience, if the front overprinting is good and the die-cutting deviation is large, it is mostly because the back tension is too large or inappropriate and the overprinting is not accurate. So most of today's flexo presses are equipped with computer automatic systems. It is important to emphasize that different plate roll design inputs are different, and there is a habit of recording data.