Abstract:
Die Erfindung betrifft ein Verfahren zur Herstellung einer Folie aus thermoplastischem Kunststoff, wobei der thermoplastische Kunststoff auf einer Extrusionsanlage, enthaltend einen Extruder, eine Extrusionsdüse mit einer Austrittsöffnung in Breitschlitzform und eine gekühlte Walze (Chill-Roll-Walze), die an einem Walzenstuhl befestigt ist, geschmolzen und gefördert wird und in Form einer flächigen Schmelzebahn aus der Austrittsöffnung der Extrusionsdüse austritt, die Schmelzebahn an die gekühlte Walze (Chill-Roll-Walze) angelegt und gekühlt wird, dadurch gekennzeichnet, dass eine Extrusionsanlage eingesetzt wird, bei der der Abstand zwischen der Austrittsöffnung Extrusionsdüse und der Oberfläche der gekühlten Walze (Chill-Roll-Walze) im Betriebszustand um nicht mehr als +/- 50 µm zeitlich variiert. Die Erfindung betrifft weiterhin die Folie selbst sowie deren Verwendungen.
Abstract:
The invention relates to a method for producing a thermoplastic plastic film. According to said method, the thermoplastic plastic is melted and transported in an extrusion installation comprising an extruder, an extrusion nozzle with a wide-slot delivery opening and a chill roll, which is fixed to a roll system and then leaves the delivery opening of the extrusion nozzle in the form of a flat melted web. Said melted web is then applied to the chill roll and is cooled. The invention is characterised in that it uses an extrusion installation, in which the distance between the delivery opening of the extrusion nozzle and the surface of the cooled roll does not vary by more than +/- 50 ?m during the operating time. The invention also relates to a film of this type and to uses of the latter.
Abstract:
The invention relates to a method for producing a thermoplastic plastic film. According to said method, the thermoplastic plastic is melted and transported in an extrusion installation comprising an extruder, an extrusion nozzle with a wide-slot delivery opening and a chill roll, which is fixed to a roll system and then leaves the delivery opening of the extrusion nozzle in the form of a flat melted web. Said melted web is then applied to the chill roll and is cooled. The invention is characterised in that it uses an extrusion installation, in which the distance between the delivery opening of the extrusion nozzle and the surface of the cooled roll does not vary by more than +/- 50 ?m during the operating time. The invention also relates to a film of this type and to uses of the latter.