Absorbent article including an absorbent structure

• US 7,883,497 B2
• Filed: 02/27/2004
• Issued: 02/08/2011
• Est. Priority Date: 02/28/2003
• Status: Expired due to Fees

• Current Assignee: SCA Hygiene Products AB (Industrivärden AB)
• Original Assignee: SCA Hygiene Products AB (Industrivärden AB)
• Inventors: Porsö, Berith, Birring, Mats, Österdahl, Eje, Vartiainen, Kent, Forsbring, Göran, Hansson, Charlotta
• Primary Examiner(s): Reichle; Karin M
• Application Number:
  US10/788,202
• Publication Number:
  US 20050192550A1
• Time in Patent Office: 2,538 Days
• Field of Search: 604378-380, 604/385.17, 604/385.21, 604/385.101, 604/385.19
• US Class Current: 604/385.01
• CPC Class Codes: A61F 13/535 inhomogeneous in the plane of the pad, e.g. core absorbent layers being of different sizes A61F13/5323, A61F13/537 take precedence
• CPC Class Codes: A61F 2013/15495 pore dimension
• CPC Class Codes: A61F 2013/53081 with special pore dimension or arrangement
• CPC Class Codes: A61F 2013/530897 having capillary means, e.g. pore or fibre size gradient

Abstract

An absorbent article includes an absorbent structure. The edge portions in the absorbent structure'"'"'s middle portion have a first mean pore size, and the central portion in the middle portion of the absorbent structure has a second mean pore size, the first mean pore size being greater than the second mean pore size. The absorbent article can be folded along the longitudinal centre axis so that a part of the article on one side of the longitudinal centre line and a corresponding part of the article on the other side of the longitudinal centre line are brought together to lie against one another at a plane of the longitudinal centre line on the upper surface of the article. The edge portions which have the greater, first mean pore size thereby form an area of the absorbent article that is first wetted during use.

Claims

1. An absorbent article having a transverse direction, a longitudinal direction, a longitudinal centre axis extending in the longitudinal direction, and a direction of thickness, the article comprising:

a liquid-permeable cover sheet arranged on an upper surface of the article,

a backing sheet arranged on a lower surface of the article, and

a folded absorbent structure enclosed between the liquid-permeable cover sheet and the backing sheet, having a transverse direction, a longitudinal direction, a longitudinal centre axis extending in the longitudinal direction, and a direction of thickness,

the absorbent structure comprising a sheet, wherein at the time the absorbent structure is folded;

the sheet is of uniform thickness, and defines, in the longitudinal direction, a middle portion and two opposite end portions and, in the transverse direction, a central portion and two opposite edge portions, and the edge portions in the middle portion of the sheet have a first mean pore size throughout the entire uniform thickness of the sheet and the central portion in the middle portion of the sheet has a second mean pore size throughout the entire uniform thickness of the sheet, the first mean pore size being greater than the second mean pore size,

the absorbent structure being folded transversely in half along the longitudinal centre axis of the absorbent structure along the entire absorbent structure along the middle portion of the sheet,

wherein an upper face of the edge portion in the middle portion of the sheet on one side of the longitudinal centre axis of the absorbent structure prior to folding and a corresponding upper face of the edge portion in the middle portion of the sheet on the other side of the longitudinal centre axis of the absorbent structure prior to folding are brought together when the absorbent structure is folded transversely in half to lie against one another at a plane of the longitudinal centre axis on an upper surface of the folded absorbent structure such that the edge portions of the sheet having the greater, first mean pore size form an area of the folded absorbent structure that during use receives liquid first before other areas of the folded absorbent structure and thus constitutes a liquid-receiving zone, the other areas of the folded absorbent structure including the central portion in the middle portion of the sheet having the lesser, second mean pore size which underlies the edge portions in the direction of thickness of the folded absorbent structure.

2. The absorbent article according to claim 1,

wherein the edge portions in the middle portion of the sheet have the first mean pore size throughout the entire direction of thickness of the absorbent structure, and

wherein the central portion in the middle portion of the sheet has the second mean pore size throughout the entire uniform thickness of the absorbent structure.

3. The absorbent article according to claim 2, wherein the edge portions of the end portions in the sheet also have the first mean pore size within at least part of the uniform thickness of the absorbent structure.

4. The absorbent article according to claim 1, wherein the absorbent structure, in the direction of thickness, has a first sheet and a second sheet, the first sheet having a smaller extent in the longitudinal direction than the second sheet.

5. The absorbent article according to claim 1, wherein the first mean pore size is at least 1.1 times as great as the second mean pore size.

6. The absorbent article according to claim 1, wherein the liquid-receiving zone has a density of between 0.02 and 0.2 g/cm³, and the area having the second, lesser mean pore size has a density of between 0.1 and 1.0 g/cm³.

7. Absorbent article according to claim 6, wherein the liquid-receiving zone has a density of between 0.06 and 0.15 g/cm³.

8. The absorbent article according to claim 6, wherein the area having the second, lesser mean pore size has a density of between 0.12 and 0.6 g/cm³.

9. The absorbent article of claim 1, wherein said absorbent article is selected from the group consisting of a diaper, an incontinence protector, and a sanitary towel.

10. The absorbent article of claim 1, wherein the fold along the central axis is the only fold of the absorbent structure.

11. The absorbent article of claim 1, wherein the absorbent structure, at the time it is folded to form the folded absorbent structure, is of uniform thickness.

12. The absorbent article of claim 1, wherein the liquid permeable cover sheet is folded with the absorbent structure such that an upper face of a first portion of the cover sheet disposed over the edge portion in the middle portion of the sheet on one side of the longitudinal centre axis of the absorbent structure prior to folding and a corresponding upper face of a second portion of the cover sheet disposed over the edge portion in the middle portion of the sheet on the other side of the longitudinal centre axis of the absorbent structure prior to folding are brought together when the absorbent structure is folded transversely in half;

to lie against one another at a plane of the longitudinal centre axis of the absorbent structure on an upper surface of the absorbent structure and thus also constitute the liquid receiving zone.

13. The absorbent article of claim 12, wherein the portions of the cover sheet brought together are directly attached to each other is directly attached to the second portion of the cover sheet.

14. The absorbent article of claim 13, wherein the direct attachment is by adhesive bonding or thermal welding.

15. The absorbent article of claim 1, wherein the upper faces of the edge portions in the middle portion of the sheet brought together are directly attached to each other.

16. The absorbent article of claim 15, wherein the direct attachment is by adhesive bonding or thermal welding.

17. A folded absorbent structure having a transverse direction, a longitudinal direction, a longitudinal centre axis extending in the longitudinal direction, and a direction of thickness, the absorbent structure comprising:

a sheet, wherein at the time the absorbent structure is folded;

the sheet is of uniform thickness, and defines, in the longitudinal direction, a middle portion and two opposite end portions and, in the transverse direction, a central portion and two opposite edge portions, and the edge portions in the middle portion of the sheet have a first mean pore size throughout the entire uniform thickness of the sheet and the central portion in the middle portion of the sheet has a second mean pore size throughout the entire uniform thickness of the sheet, the first mean pore size being greater than the second mean pore size,

the absorbent structure being folded transversely in half along the longitudinal centre axis of the absorbent structure along the entire absorbent structure along the middle portion of the sheet,

wherein an upper face of the edge portion in the middle portion of the sheet on one side of the longitudinal centre axis of the absorbent structure prior to folding and a corresponding upper face of the edge portion in the middle portion of the sheet on the other side of the longitudinal centre axis of the absorbent structure prior to folding are brought together when the absorbent structure is folded transversely in half to lie against one another at a plane of the longitudinal centre axis on an upper surface of the folded absorbent structure such that the edge portions of the sheet having the greater, first mean pore size form an area of the folded absorbent structure that during use receives liquid first before other areas of the folded absorbent structure and thus constitutes a liquid-receiving zone, the other areas of the folded absorbent structure including the central portion in the middle portion of the sheet having the lesser, second mean pore size which underlies the edge portions in the direction of thickness of the folded absorbent structure.