Coextrusion device, Einschichtextrusionsvorrichtung and retrofit kit and method for measuring a layer thickness, for producing a plastic film and for retrofitting an extrusion device

摘要

The invention relates to a coextrusion device, a Einschichtextrusionsvorrichtung, a retrofit kit and a method for measuring a layer thickness, for producing a plastic film and for retrofitting an extrusion device. From the prior art, it is known to give a detection means in the form of a fluorescent granules in the starting material at the extruder in order to measure the layer thickness of the layer produced from this starting material in the film composite can. However, it is proposed to feed a detection means only beyond the extruder. This leads to a significantly shorter transit time of the detection means through the plant and thus to a much faster measurability of changes in the production parameters.