Installation and method for producing a single- or multi-layer nonwoven

Patent metadata

Field	Value
Publication number	US-12331440-B2
Application number	US-202017791853-A
Country	US
Kind code	B2
Filing date	Dec 4, 2020
Priority date	Jan 10, 2020
Publication date	Jun 17, 2025
Grant date	Jun 17, 2025

Abstract

The invention relates to an installation and a method for selectively producing a single- or multi-ply nonwoven includes an inclined wire former configured to deposit a sheet of wet-laid fibre material on a first circulating belt, a further belt configured to receive the sheet of wet-laid fibre material from the first circulating belt, a roller card arranged downstream in the material transport direction and configured to introduce a roller card web into the installation, a hydroentanglement arranged downstream in the material transport direction and including at least one water beam configured to entangle, bond and/or structure a single sheet of fibres or a plurality of sheets of fibres, and a dryer arranged downstream in the material transport direction.

First claim

The invention claimed is:

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.

2. The method according to claim 1 , comprising using the hydroentangler to at least one of entangle, bond and structure the wet-laid fibre material together with at least one of the roller card web and the further web at a pressure of from 40 bar to 400 bar.

Assignees

• Truetzschler Group Se
• Voith Patent Gmbh

Inventors

• Weigert Thomas
• Seils Florian
• Pöhler Kai

Classifications

• D10B2321/022

  polypropylene · CPC title

• D10B2201/24

  Viscose · CPC title

• D04H1/49

  entanglement by fluid jet in combination with another consolidation means · CPC title

• D04H1/435

  Polyesters · CPC title

• D04H1/4334

  Polyamides · CPC title