Absorbent fibrous web

Patent metadata

Field	Value
Publication number	US-12521287-B2
Application number	US-202017783293-A
Country	US
Kind code	B2
Filing date	Dec 2, 2020
Priority date	Dec 20, 2019
Publication date	Jan 13, 2026
Grant date	Jan 13, 2026

Abstract

The present disclosure relates to an absorbent fibrous web, in which the fibres are constituted by cellulosic fibres including cellulosic staple fibres and cellulose pulp fibres and the absorbent fibrous web is a foam-formed hydro-entangled fibrous web. The present disclosure further relates to a method of manufacturing such an absorbent fibrous web.

First claim

The invention claimed is:

1 . An absorbent fibrous web, comprising a foam-formed hydro-entangled fibrous web, the fibres of the absorbent fibrous web being constituted by only cellulosic fibres comprising cellulosic staple fibres and cellulose pulp fibres,
wherein the cellulosic fibres located in a first surface layer have a sufficiently similar fibre composition and a sufficiently similar orientation of fibres as the cellulosic fibres located at a second surface layer being opposite to the first surface layer in order to avoid two-sidedness, wherein the fibres extend at least partly in the Z-direction of the web, wherein the Z-direction is the thickness direction of the web, and wherein the cellulosic staple fibres make up in the range of 2-25% of a total weight of the cellulosic fibres, and wherein the web has a Spreading Speed, as measured with an MMT method described herein, taken as an average for both surface layers of the absorbent fibrous web and as an average of top and bottom, of over 6 mm/s.

2 . The absorbent fibrous web according to claim 1 , wherein the cellulosic staple fibres are regenerated cellulosic fibres.

3 . The absorbent fibrous web according to claim 1 , wherein the cellulosic staple fibres and the cellulose pulp fibres are mixed with each other.

4 . The absorbent fibrous web according to claim 1 , wherein the cellulosic staple fibres have a length in the range of 2-25 mm.

5 . The absorbent fibrous web according to claim 1 , wherein the cellulosic staple fibres have a linear density within the range of 0.3-3 dtex.

6 . The absorbent fibrous web according to claim 1 , wherein the cellulosic staple fibres make up in the range of 10-17% of a total weight of the cellulosic fibres.

7 . The absorbent fibrous web according to claim 1 , wherein the cellulose pulp fibres make up in the range of 50-98% of a total weight of the cellulosic fibres.

8 . The absorbent fibrous web according to claim 1 , having a basis weight in the range of 10-250 gsm.

9 . The absorbent fibrous web according to claim 1 , wherein the absorbent fibrous web is micro-embossed.

10 . The absorbent fibrous web according to claim 1 , having a TS7 Softness value of less than 25 as measured with a TSA method described herein.

11 . The absorbent fibrous web according to claim 1 , having a Wetting Time, as measured with an MMT method described herein, taken as an average for both surface layers of the absorbent fibrous web and as an average of top and bottom, of less than 2.3 s.

12 . The absorbent fibrous web according to claim 1 , having an Air Permeability of at least 800 mm/s as measured with an Air Permeability method described herein.

13 . The absorbent fibrous web according to claim 1 , wherein during formation of the web, the fibres are fed between two permeable fabrics dewatered through each of the two permeable fabrics so that the orientation of the fibres in the web are symmetrical in a direction perpendicular to the two surface layers.

14 . A method of wiping with the absorbent fibrous web according to claim 1 , wherein the absorbent fibrous web is one of a hand wiping material, a hygiene tissue and a layer in an absorbent article for absorption of a body fluid.

15 . A method of manufacturing an absorbent fibrous web according to claim 1 , wherein the method comprises:
foam-forming a mixture of cellulosic fibres, the cellulosic fibres comprising cellulosic staple fibres and cellulose pulp fibres, two-sided dewatering of the mixture to form an intermediate web, and hydro-entangling the intermediate web.

16 . The method according to claim 15 further comprising micro-embossing on at least one surface of the absorbent fibrous web.

17 . An absorbent fibrous web, comprising a foam-formed hydro-entangled fibrous web having a first surface layer and a second surface layer, the fibres of the absorbent fibrous web being constituted only by cellulosic fibres comprising cellulosic staple fibres and cellulose pulp fibres,
wherein during formation of the web, the fibres are fed between two permeable fabrics dewatered through each of the two permeable fabrics so that the orientation of the fibres in the web are symmetrical in a direction perpendicular to the two surface layers, wherein the fibres extend at least partly in the Z-direction of the web, wherein the Z-direction is the thickness direction of the web, and wherein the cellulosic staple fibres make up in the range of 2-25% of a total weight of the cellulosic fibres, and wherein the web has a Wetting Time, as measured with an MMT method described herein, taken as an average for both surface layers of the absorbent fibrous web and as an average of top and bottom, of less than 2.3 s.

18 . The absorbent fibrous web according to claim 17 , having a TS750 Roughness value of less than 30 as measured with a TSA method described herein.

19 . The absorbent fibrous web according to claim 1 , having a Spreading Speed, as measured with an MMT method described herein, taken as an average for both surface layers of the absorbent fibrous web and as an average of top and bottom, of over 6 mm/s.

20 . An absorbent fibrous web, comprising a foam-formed hydro-entangled fibrous web, the fibres of the absorbent fibrous web being constituted by only cellulosic fibres comprising cellulosic staple fibres and cellulose pulp fibres,
wherein the cellulosic fibres located in a first surface layer have a sufficiently similar fibre composition and a sufficiently similar orientation of fibres as the cellulosic fibres located at a second surface layer being opposite to the first surface layer in order to avoid two-sidedness, wherein the fibres extend at least partly in the Z-direction of the web, wherein the Z-direction is the thickness direction of the web, and wherein the cellulosic staple fibres make up in the range of 2-25% of a total weight of the cellulosic fibres, and wherein the web has an Absorption Time of less than 1.0 s as measured with an AWR method described herein.

21 . An absorbent fibrous web, comprising a foam-formed hydro-entangled fibrous web, the fibres of the absorbent fibrous web being constituted by only cellulosic fibres comprising cellulosic staple fibres and cellulose pulp fibres,
wherein the cellulosic fibres located in a first surface layer have a sufficiently similar fibre composition and a sufficiently similar orientation of fibres as the cellulosic fibres located at a second surface layer being opposite to the first surface layer in order to avoid two-sidedness, wherein the fibres extend at least partly in the Z-direction of the web, wherein the Z-direction is the thickness direction of the web, and wherein the cellulosic staple fibres make up in the range of 2-25% of a total weight of the cellulosic fibres, and wherein the web has a Water Spreading Length in a machine direction of the absorbent fibrous web of at least 60 mm as measured with an AWR method described herein.

Assignees

• Essity Hygiene & Health Ab

Inventors

• Rössler Joraine
• Nihlstrand Anna
• Fingal Lars

Classifications

• D10B2509/026

  Absorbent pads; Tampons; Laundry; Towels · CPC title

• D04H1/492

  by fluid jet (D04H1/49 takes precedence) · CPC title

• D04H1/4258

  Regenerated cellulose series · CPC title

• A61F2013/530036

  being made in chemically-modified cellulosic material, e.g. Rayon · CPC title

• A61F2013/15983

  by hydroentangled technique · CPC title