Discharging on an unwinder from a gravure printed film

An inspection machine checks the print quality. The film is unwound and rewound again.

A plastic film printed in gravure or in flexo printing is controlled on an inspection machine with regard to its print quality. Instead of the inspection machine, however, the printing press can also be followed by a slitter rewinder or a coating machine. In all cases, the plastic film is unwound at the unwinder.

This results in electrostatic charges that are difficult to eliminate.

Depending on how highly the plastic film has been charged by the process in the gravure or in the flexo press, high to extremely high electrostatic charges of well over 100 KV occur during unwinding, with flashes on the plastic reel. The high-energy flashes can injure the operators and dirt or even insects from the environment are attracted to the film. The web speed is approx. 400 m/min.

Our solution

The extremely highly charged plastic film can be discharged by using 2 to 3 discharging bars. Correct positioning and the type of bar used is crucial for success.

Contact us

Which Eltex components are used?

blueBAR R50

The robust all-rounder bar The VARIO discharge bar blueBAR R50 creates a significantly higher active discharge capacity than most discharge techniques. The isolated ground conductor enhances the E-field at the active tips, contributing to increased production and velocity of charge carriers. Thus, significantly more positive ions and free negative electrons are available than with conventional bars. At the same time, the bars have a high passive discharge capacity. The resistance-decoupled tips ensure good discharge performance and make the bar absolutely short-circuit and touch-proof.  

Continue reading


The robust all-rounder with a large power input The VARIO IONIZER ES51 has 5 connections and works with proven Eltex technology. On the top side there is a LED display for the function and fault message. The device also has an analog interface. For a good ion balance, the device is available with and without parameter diode.

Continue reading

Are you looking for technical solutions or do you have questions about our product portfolio?

We will be happy to advise you free of charge and discuss the possible next steps with you.