Plant for producing a coextruded multi-layer film, apparatus for coextruding a multilayered coextrusion composite and method for coextruding and also method for operating a plant and/or apparatus for this purpose

Apparatus (10) for coextruding a multilayer coextrusion composite (3) comprising:

• interconnected individual layers (5, 6) of thermoplastic materials, having a coextrusion adapter (12) which has a central channel (40) for producing a central layer (5) of the coextrusion composite (3), at least one coextrusion channel (42) for producing at least one further layer (6) of the coextrusion composite (3) interacting with the central layer (5),
• a plurality of displaceable adjusting elements (47), each comprising a rotatable member mounted in a threaded bore, for adjusting layer thicknesses (50) or layer thickness profiles of the individual layers (5, 6) of the coextrusion composite (3) and
• adjusting devices (53), each comprising a drive-side engagement structure (55) configured to receive a tool for actuating the adjusting elements (47), and with a nozzle part (33) through which the multilayer coextrusion composite (3) is discharged,
• wherein a measuring device (24), positioned downstream of the nozzle part (33), configured to automatically measure the layer thicknesses (50) or the layer thickness profiles of the multilayer coextrusion composite (3) is arranged downstream of the nozzle part (33),
• wherein the apparatus (10) being set up to manipulate the plurality of displaceable adjusting elements (47) automatically by means of measurement data obtained from the measuring device (24),
• wherein the apparatus further includes an actuator (58) being located at a distance (62) of more than 50 mm from the coextrusion adapter (12), and
• wherein a flexible, thermally conductive coupling element (66) is arranged between an input-side drive element (55) of an adjusting device (53) and an output-side output element (65) of the actuator (58).