US 11,712,832 B2
Method and device for producing a melt and/or plastic film
Thomas Knoche, Traunstein (DE); Maximilian Armbruster, Wasserburg a. Inn (DE); Andreas Hoffmann, Stephanskirchen (DE); Sebastian Frass, Stephanskirchen (DE); Heiko Krippner, Traunstein (DE); and Steffen Kuhnigk, Inzell (DE)
Assigned to Brückner Maschinenbau GmbH, Siegsdorf (DE)
Filed by BRÜCKNER MASCHINENBAU GmbH, Siegsdorf (DE)
Filed on Jul. 17, 2020, as Appl. No. 16/932,232.
Claims priority of application No. 10 2019 119 505.5 (DE), filed on Jul. 18, 2019.
Prior Publication US 2021/0016486 A1, Jan. 21, 2021
Int. Cl. B29C 48/91 (2019.01); B29C 48/88 (2019.01); B29C 48/08 (2019.01); B29C 48/27 (2019.01); B29C 48/14 (2019.01); B29L 31/34 (2006.01); B29C 55/12 (2006.01)
CPC B29C 48/914 (2019.02) [B29C 48/08 (2019.02); B29C 48/1472 (2019.02); B29C 48/274 (2019.02); B29C 55/12 (2013.01); B29L 2031/3468 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A device for producing a monoaxially or biaxially stretched plastic film, the device comprising:
an extruder,
a cooling roller, to which a melt film or plastic film is fed from the extruder and is placed along a contact line on a roller jacket of the cooling roller, from where the melt or plastic film is conveyed over a partial wrap angle around the cooling roller,
wherein a wedge-shaped intermediate space tapering towards the contact line is formed between the melt or plastic film and the roller jacket, a geometry of the intermediate space being defined by a plane of the melt or plastic film between the extruder and contact line, a portion of the roller jacket facing the plane of the melt or plastic film, and a plane extending from the roller jacket to an opposing line extending across the width of the melt or plastic film, the opposing line being spaced from both the extruder and the contact line, and the plane of the melt or plastic film defining an acute angle with the roller jacket at the contact line,
wherein the device further comprises at least one device for preventing condensate from precipitating on the underside of the melt or plastic film facing the roller jacket, on the roller jacket, or on a roller surface of the cooling roller, wherein the at least one device for preventing condensate is provided entirely within the intermediate space and is designed such that:
a) precipitation of condensate on the underside of the melt or plastic film facing the roller jacket, and/or on the roller jacket is prevented by means of a portion of a cover device or shielding device,
b) precipitated condensate evaporates or vaporises, and/or
c) condensate located in the intermediate space is transported away, suctioned off, blown off, and/or run out.