Gravure printing press in flexible packaging / production of flat films
During the production of high-resistance plastic films or their printing in gravure printing presses, in particular when using an electrostatic printing assist, the formation of charge double layers on the film is possible.
This results in electrostatic charges that are difficult to discharge.
Charge double layers, which in extreme cases have the same charge with different sign on both sides of the film, cannot generally be eliminated by conventional discharge with ionizers. The negative effects of the charge double layer occur mainly during winding of the film, but also during unwinding of the film in the succeeding machines. Strong electrostatic discharges can occur there. In packaging machines in which such films are processed, the film adheres to machine parts and thus causes transport problems.