US 11,951,668 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 BRUCKNER MASCHINENBAU GmbH, Siegsdorf (DE)
Filed by BRÜCKNER MASCHINENBAU GmbH, Siegsdorf (DE)
Filed on Jun. 9, 2023, as Appl. No. 18/332,040.
Application 18/332,040 is a continuation of application No. 16/932,232, filed on Jul. 17, 2020, granted, now 11,712,832.
Claims priority of application No. 10 2019 119 505.5 (DE), filed on Jul. 18, 2019.
Prior Publication US 2023/0311401 A1, Oct. 5, 2023
This patent is subject to a terminal disclaimer.
Int. Cl. B29C 48/91 (2019.01); B29C 48/08 (2019.01); B29C 48/14 (2019.01); B29C 48/27 (2019.01); B29C 48/88 (2019.01); B29C 55/12 (2006.01); B29L 31/34 (2006.01)
CPC B29C 48/914 (2019.02) [B29C 48/08 (2019.02); B29C 48/1472 (2019.02); B29C 48/1476 (2019.02); B29C 48/274 (2019.02); B29C 55/12 (2013.01); B29L 2031/3468 (2013.01)] 17 Claims
OG exemplary drawing
 
1. A device for producing a monoaxially or biaxially stretched plastic film, the device comprising:
an extruder, and
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 the plastic film is conveyed over a partial wrap angle around the cooling roller,
wherein an intermediate space tapering to the contact line is formed downstream of the extruder between the melt or plastic film and the roller jacket,
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, and
wherein the at least one device for preventing condensate comprises a sheet-like shielding mat or cover wall, and the shielding mat or cover wall is held in place relative to the cooling roller on one end thereof upstream of the intermediate space, the cooling roller rotating beneath and relative to the shielding mat or cover wall, and wherein the shielding mat or cover wall rests on the roller jacket in a partial circumferential region thereof and extends at least partially into the intermediate space, and a trailing end of the shielding mat or cover wall terminates in the intermediate space at a distance in front of the contact line.