Method for producing a thermoplastic plastic film, film and use thereof
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United States of America Patent
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Jan 10, 2012
Grant Date -
Jul 31, 2008
app pub date -
Nov 24, 2005
filing date -
Apr 29, 2005
priority date (Note) -
Expired
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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.
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