Corona effect surface treatment machine

In recent years, cast film lines have been built faster and wider. Widths over five meters and production speeds around 400 m / min are not unusual. Polypropylene films are often produced on cast film lines, which can only be pretreated with a high energy input and very often only to a surface energy of 44 to 46 mN / m. The PP foils are usually only treated on one side, either the front or the back. Pretreatment of the other side (back side effect) is almost always undesirable and can lead to problems in the subsequent processes. This places special demands on the corona pretreatment system. The high energy input for high speeds and wider widths requires high generator outputs. Our module generators (see generator) with a maximum output of up to 144 kW effortlessly cover the required performance spectrum. With a single generator with contactor circuit, you can select the side to be pretreated either directly on the generator or remotely via the BUS connection. If both sides are to be pretreated, the double generators (M2) from AFS are recommended for total flexibility. In order to place the high generator outputs on the film without damaging the films, some of which are heat-sensitive, many good individual solutions are required in the pretreatment station. Potential issues are for example. wrinkles, which can lead to a reverse side effect and impair the pretreatment result. Optimal ventilation of the electrode chamber prevents excessive heating of the electrodes and thus also of the foil. In addition, water-cooled pre-treatment rollers support the process of adequate heat dissipation.