US 12,331,440 B2
Installation and method for producing a single- or multi-layer nonwoven
Thomas Weigert, Sulzbach (DE); Florian Seils, Seligenstadt (DE); and Kai Pöhler, Vettweiss (DE)
Assigned to TRÜTZSCHLER GROUP SE, Mönchengladbach (DE); and VOITH PATENT GMBH, Heidenheim (DE)
Appl. No. 17/791,853
Filed by TRÜTZSCHLER GROUP SE, Mönchengladbach (DE); and VOITH PATENT GMBH, Heidenheim (DE)
PCT Filed Dec. 4, 2020, PCT No. PCT/EP2020/084680
§ 371(c)(1), (2) Date Jul. 8, 2022,
PCT Pub. No. WO2021/139933, PCT Pub. Date Jul. 15, 2021.
Claims priority of application No. 102020100424.9 (DE), filed on Jan. 10, 2020; and application No. 102020122864.3 (DE), filed on Sep. 1, 2020.
Prior Publication US 2023/0026339 A1, Jan. 26, 2023
Int. Cl. D04H 1/492 (2012.01); B32B 5/02 (2006.01); B32B 5/06 (2006.01); B32B 5/26 (2006.01); B32B 37/00 (2006.01); D04H 1/4374 (2012.01); D04H 1/49 (2012.01); D04H 1/498 (2012.01); D04H 18/04 (2012.01); D04H 1/4258 (2012.01); D04H 1/4291 (2012.01); D04H 1/4334 (2012.01); D04H 1/435 (2012.01)
CPC D04H 18/04 (2013.01) [B32B 5/022 (2013.01); B32B 5/067 (2021.05); B32B 5/266 (2021.05); B32B 37/0038 (2013.01); B32B 37/0053 (2013.01); D04H 1/4374 (2013.01); D04H 1/49 (2013.01); D04H 1/492 (2013.01); D04H 1/498 (2013.01); B32B 2250/20 (2013.01); B32B 2262/0253 (2013.01); B32B 2262/0261 (2013.01); B32B 2262/0276 (2013.01); B32B 2262/144 (2021.05); B32B 2317/10 (2013.01); B32B 2323/10 (2013.01); B32B 2367/00 (2013.01); B32B 2377/00 (2013.01); D04H 1/4258 (2013.01); D04H 1/4291 (2013.01); D04H 1/4334 (2013.01); D04H 1/435 (2013.01); D10B 2201/24 (2013.01); D10B 2321/022 (2013.01)] 2 Claims
OG exemplary drawing
 
1. A method for producing a two-ply or three-ply nonwoven comprising:
producing in an inclined wire former a web of wet-laid fibrous material consisting of 70%-95% by weight of pulp and 30%-5% by weight of solvent-spun cellulose fibers; and
selectively forming the two-ply non-woven by performing one of the following steps (A) and (B) or forming the three-ply nonwoven by performing both of the following steps (A) and (B):
(A) depositing a carded nonwoven on the web of wet-laid fibrous material from a card arranged above and downstream in a material transport direction from the inclined wire former; and
(B) introducing a further web on the web of wet-laid fibrous material from either an unwinding station or a further card located upstream of or below the inclined wire former;
wherein each of the carded nonwoven and the further web in steps (A) and (B) consist of 100% by weight of solvent-spun cellulose fibres, or 100% by weight of viscose or 100% by weight of a mixture of solvent-spun cellulose fibres and viscose;
feeding the two-ply or three-ply nonwoven to a hydroentangler for at least one of bonding, entangling and structuring the plys of the two-ply or three-ply nonwoven; and
subsequently drying the two-ply or three-ply nonwoven.