US 12,338,562 B2
System and method for producing a single- or multi-layer nonwoven
Thomas Weigert, Sulzbach (DE); Kai Pöhler, Vettweiss (DE); Ralf Schröder, Langen (DE); and Andreas Schilz, Aachen (DE)
Assigned to TRÜTZSCHLER GROUP SE, Mönchengladbach (DE); and VOITH PATENT GMBH, Heidenheim (DE)
Appl. No. 18/017,428
Filed by TRÜTZSCHLER GMBH & CO. KG, Mönchengladbach (DE); and VOITH PATENT GMBH, Heidenheim (DE)
PCT Filed Apr. 20, 2021, PCT No. PCT/EP2021/060233
§ 371(c)(1), (2) Date Jan. 23, 2023,
PCT Pub. No. WO2021/228514, PCT Pub. Date Nov. 18, 2021.
Claims priority of application No. 10 2020 113 137.2 (DE), filed on May 14, 2020.
Prior Publication US 2023/0304200 A1, Sep. 28, 2023
Int. Cl. D04H 1/498 (2012.01); D04H 1/732 (2012.01)
CPC D04H 1/498 (2013.01) [D04H 1/732 (2013.01)] 11 Claims
OG exemplary drawing
 
1. An installation for producing a multi-layer nonwoven, comprising:
a cylinder mould former for producing a layer of wet laid fibres including:
a rotating cylinder having an outer surface;
a headbox formed for depositing a fibre suspension on the outer surface of the rotating cylinder with a top side of the fibre suspension extending away from the outer surface of the rotating, cylinder;
a circulating belt having an outer surface arranged along a circular portion of the rotating cylinder for compacting the fibre suspension at the rotating cylinder to create a layer of wet laid fibres with a smooth underside on the rotating cylinder; and
a doffer with a suction chamber arranged inside the circulating belt in an area where the circulating belt separates from the rotating cylinder and travels in a downward direction toward an installation circulating belt travelling essentially in a horizontal direction and carrying a nonwoven layer;
wherein the top side of the fibre suspension remains attached to the outer surface of the circulating belt due to suction of the doffer so that the laver of wet laid fibre suspension is transported upside-down from the rotating cylinder for being deposited with its smooth underside onto the nonwoven layer carried by the installation circulating belt;
an entangling device following the cylinder mould former in the material transport direction; and
at least one dryer disposed downstream in the material transport direction from the entangling device.