Extrusion device and extrusion method that produces a plastic film

An extrusion device that produces plastic film comprising at least two feed units that feed feedstock for an extruder by separately discharging feedstock from each feed unit into the extruder wherein, in each feed unit an automatic cleaning device is arranged for a removal of feedstock from the feed unit when changing material in the extrusion device, wherein the cleaning device of each feed unit has at least two cleaning means at different locations of each feed unit, and the cleaning means are arranged consecutively in direction of a discharge direction of the feed unit;

• wherein the feed unit comprises a weighing funnel, a down pipe and a dosing screw;
• the cleaning device comprises at least one cleaning means in the weighing funnel, in the down pipe and in an area of the dosing screw;
• the dosing screw is configured to operate backwards in the course of cleaning;
• and
• the feed unit has a dust protection against an escape of dust from the feed unit, the dust protection being arranged in an area of the weighing funnel transitioning to the dosing screw.