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