Nonwoven material containing a mixture of pulp fibres and long hydrophillic plant fibres and a method of producing the nonwoven material

• US 5,958,186 A
• Filed: 03/19/1997
• Issued: 09/28/1999
• Est. Priority Date: 10/24/1994
• Status: Expired due to Fees

• Current Assignee: SCA Hygiene Products AB (Industrivärden AB)
• Original Assignee: SCA Hygiene Products AB (Industrivärden AB)
• Inventors: Holm, Ulf, Milding, Ebbe
• Primary Examiner(s): Silverman, Stanley S.
• Assistant Examiner(s): Fortuna, Jose A.
• Application Number:
  US08/809,234
• Time in Patent Office: 923 Days
• Field of Search: 162/108, 162/115, 162/201, 162/101, 162/91, 162/95, 162/96, 162/97, 162/98, 162/99, 162/148, 162/149, 28/104, 28/105, 28/107, 442/408, 442/402, 428/311.11, 428/311.51, 428/311.71
• US Class Current: 162/115
• CPC Class Codes: D21F 11/00 Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
• CPC Class Codes: D21H 11/12 Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse
• CPC Class Codes: D21H 15/06 Long fibres, i.e. fibres exceeding the upper length limit of conventional paper-making fibres; Filaments
• CPC Class Codes: Y10T 428/249964 Fibers of defined composition
• CPC Class Codes: Y10T 442/682 Needled nonwoven fabric
• CPC Class Codes: Y10T 442/689 Hydroentangled nonwoven fabric

Abstract

Nonwoven material produced by hydroentanglement of a wet-laid or foam-formed fibre web. The material comprises a mixture of short plant fibres, in particular pulp fibres, and long hydrophillic plant fibres, where the major portion of the fibres presents a fibre length which is at least 10 mm, whereby the portion of long fibres is at least 1 weight-% of the fibre weight. The fibres were mixed with each other in the presence of a dispersing agent which allows a uniform fibre formation, in a wet-laid or foam-formed fibre web which has been hydroentangled with sufficient energy to form a compact absorbing material.

Claims

1. Nonwoven material produced by hydroentanglement of a wet-laid or foam-formed fibre web, comprising:

a mixture of short plant fibres, where a major portion of the short plant fibres presents a fibre length below 5 mm, and long hydrophillic plant fibres in the form of elementary fibres where a major portion of the long hydrophillic plant fibres presents a fibre length which is at least 10 mm, wherein the long hydrophillic plant fibres is at least 1% weight of the fibre weight,

the fibres of said nonwoven material comprise only natural fibres, and

the short plant fibres and the long hydrophillic plant fibres have been mixed with each other in the presence of a dispersing agent which allows a uniform fibre formation, in a wet-laid or foam-formed fibre web which has been hydroentangled with sufficient energy to form a compact adsorbing material.

2. Nonwoven material according to claim 1, wherein the long hydrophillic plant fibres are constituted by leaf fibres including abaca, pineapple, phormium tenax;

bast fibres including flax, hemp, ramie;

or seed hair fibres including cotton, kapok or milkweed.

3. Nonwoven material according to claim 1, wherein the proportion of long hydrophillic plant fibres is between 5 and 80 weight-%.

4. Nonwoven material according to claim 3, wherein the proportion of long hydrophillic plant fibres is between 20 and 60 weight-%.

5. Nonwoven material according to claim 1, wherein the nonwoven material includes a wet strength agent or a binder.

6. Nonwoven material according to claim 1, wherein the nonwoven material has a wet strength MD greater than 680 N/m and a wet strength CD greater than 240 N/m.

7. Nonwoven material according to claim 1, wherein the nonwoven material has a wet strength MD of about 790 N/m, or greater, and a wet strength CD of about 286 N/m, or greater.

8. Non-woven material according to claim 1, further comprising a wet strength agent between 0.1 and 10% weight.

9. Nonwoven material according to claim 8, wherein the proportion of wet strength agent or chemical is between 1 and 5 weight-%.

10. Method of producing a nonwoven material according to claim 1, wherein a fibre web is formed by wet-laying or foam-forming, said fibre web comprising between 1 and 99 weight-% of pulp fibres or alternatively other plant fibres, calculated with respect to the total fibre weight, where the major part of the fibres has a fibre length below 5 mm, as well as between 1 and 99 weight-% long hydrophillic plant fibres calculated with respect to the total fibre weight, where the major part of the fibres presents a fibre length of at least 10 mm, in the presence of a dispersion agent which allows a uniform fibre formation, and by forming a compact absorbent material of entangled fibres by subjecting the fibre web to hydroentanglement and thereafter drying the material.

11. Method according to claim 10, wherein in connection with the hydroentanglement a wet strength agent or binder is added to the material by spraying, impregnation, or coating.