Method for producing a thermoplastic plastic film, film and use thereof

US8092731B2 · kind B2 · utility

Assignee

• Röhm GmbH · DE

Inventors

• Claude Guenanten · Darmstadt, DE
• Christoph Steinfels · Weiterstadt, DE
• Herbert Groothues · Frankfurt, DE
• Christoph Krohmer · Riedstadt, DE
• Helmut Haering · Reinheim, DE
• Detlef Birth · Dieburg, DE
• Christopher Neuroth · Groß-Zimmern, DE
• Michael Meier-Kaiser · Pfungstadt, DE
• Walter Meon · Darmstadt, DE

Key dates

• Filing date: Nov 24, 2005
• Grant date: Jan 10, 2012
• Expiry date: Jul 20, 2027

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29K2105/256
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

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 μm during the operating time. The invention also relates to a film of this type and to uses of the latter.