US 12,064,910 B2
System for the improved introduction of a separating device and blown film line, as well as a method for the production and supply of at least two plastic film webs in a blown film line
Tim Oberdalhoff, Lienen (DE); Thomas Sehlleier, Coesfeld-Lette (DE); Sebastian Martinek, Neuenkirchen-Vörden (DE); and Tim Kirchhoff, Münster (DE)
Assigned to Windmöller & Hölscher KG, Lengerich (DE)
Appl. No. 17/599,824
Filed by Windmöller & Hölscher KG, Lengerich (DE)
PCT Filed Mar. 27, 2020, PCT No. PCT/EP2020/058852
§ 371(c)(1), (2) Date Sep. 29, 2021,
PCT Pub. No. WO2020/201155, PCT Pub. Date Oct. 8, 2020.
Claims priority of application No. 10 2019 108 344.3 (DE), filed on Mar. 29, 2019; and application No. 10 2019 127 454.0 (DE), filed on Oct. 11, 2019.
Prior Publication US 2022/0193974 A1, Jun. 23, 2022
Int. Cl. B29C 48/00 (2019.01); B26D 1/02 (2006.01); B29C 48/10 (2019.01); B29C 48/25 (2019.01); B29C 48/28 (2019.01); B29C 48/355 (2019.01); B29C 48/92 (2019.01); B29L 23/00 (2006.01)
CPC B29C 48/0022 (2019.02) [B26D 1/025 (2013.01); B29C 48/0017 (2019.02); B29C 48/0018 (2019.02); B29C 48/0019 (2019.02); B29C 48/10 (2019.02); B29C 48/2528 (2019.02); B29C 48/28 (2019.02); B29C 48/355 (2019.02); B29C 48/92 (2019.02); B29C 2793/0036 (2013.01); B29C 2793/0054 (2013.01); B29C 2793/0063 (2013.01); B29C 2948/92295 (2019.02); B29C 2948/92438 (2019.02); B29C 2948/92447 (2019.02); B29L 2023/001 (2013.01)] 54 Claims
OG exemplary drawing
 
1. A system for improved introduction of a separating device into a flattened film tube of a plant, comprising:
a separating device configured to separate the flattened film tube into two separate film webs;
a cutting device for cutting through only a first tube side of the film tube, wherein the cutting device has at least one cutting element for effecting a severing cut on the film tube; and
an opening device arranged downstream of the cutting device and upstream of the separating device in a transport direction of the film tube for opening the flattened film tube along the severing cut to facilitate inserting the separating device into the flattened film tube,
wherein the opening device includes at least one opening element configured to move from a position outside the flattened film tube to pass through the severing cut.