Discharge at the winder with E-field measurement

What is the function of the winder in film converting?

On the slitter rewinder, a rotogravure-printed plastic film, e.g. OPP, is cut lengthwise into several panels. The individual panels are as wide as a subsequent packaging machine. However, the individual panels are transported to another packaging plant. The slitter rewinder is the last machine before this film goes to the packaging plant. To avoid complaints due to electrostatically charged film, the film must be discharged as best as possible in the winder. As proof, the residual charge is measured and recorded on each film.

The electrostatic charge must be reduced as much as possible on the winder.

Since costly complaints can be expected from the packaging company if the electrostatic charge of the film on the winder is too high, the residual charge after the discharging bars should be logged. For this purpose, a permanent E-field measurement is necessary. The bars should therefore discharge the film as much as possible. The measured values are logged and are available to the end customer if required.

Our solution

Discharge bars and power supplies are used which are able to discharge to a minimum residual charge at high web speeds.

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Which Eltex components are used?

The following Eltex products have been installed and tested on site by our experts. If you would like to learn more or have any questions, please do not hesitate to contact us.

POWER IONIZER

The high-performance discharge power supply POWER IONIZER impresses with its flexibility. The simple operation, the LED display for visualization of the current values and the integrated function and malfunction monitoring characterize the power supply unit. The POWER IONIZER can be operated with the Eltex AC discharging bars, ion blower nozzles and ion blower pistols. Lowest residual charges can be achieved by different adjustable parameters. Operation is possible as single unit or in a network.

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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.  

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