Active charging on an inline finishing system WPM

Inline finishing system in a web offset press

A 48-page Goss M4000 web offset press is equipped with a WPM inline finishing system for the direct mail market.

What problems arise on the paper ribbons at high web speeds?

After the turning bars, the individual ribbons are guided over a plow fold. Between the ribbons an air cushion is formed which leads to an unstable transport of the ribbons. The web speed must be reduced in order to achieve the required quality.

Our solution

By using suitable charging electrodes, the paper ribbons can be electrostatically blocked without contact. A subsequent ionization device ensures trouble-free finishing.

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Which Eltex components are used?


The new POWER CHARGER units cover various performance stages and charging applications. They can be operated either with a supply voltage of 24 V DC or a line voltage in the range of 85 V – 264 V AC. The output voltage is 75 or 150 watts. A membrane keyboard or an optionally available, integrated touch panel is used to control the generators. POWER CHARGER units can be operated using analog operation or via digital fieldbus interfaces. At the market launch, a control system that uses CANopen and ModbusTCP are available. The modular system is only prepared for integrating other fieldbus standards.   Protocol/device description files of the fieldbus interfaces for integration into the machine control: Information on fieldbus integration

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Heavy-duty precision bar for supply voltages up to 60 kV. The charge and field distribution have been substantially improved by the optimized arrangement of the individual bars. Separate current-limited tips prevent an increase in air ionization and high-energy brush discharges.

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