Absorbent structure that has a high degree of utilization

• US 6,441,268 B1
• Filed: 06/17/1999
• Issued: 08/27/2002
• Est. Priority Date: 12/17/1996
• Status: Expired due to Fees

• Current Assignee: SCA Hygiene Products AB (Industrivärden AB)
• Original Assignee: SCA Hygiene Products AB (Industrivärden AB)
• Inventors: Edwardsson, Gunnar
• Primary Examiner(s): Weiss, John G.
• Assistant Examiner(s): Stephens, Jacqueline F
• Application Number:
  US09/331,154
• Time in Patent Office: 1,167 Days
• Field of Search: 604/369, 604/374, 604/378, 604/379, 604/380
• US Class Current: 604/378
• CPC Class Codes: A61F 13/532 inhomogeneous in the plane of the pad
• CPC Class Codes: A61F 2013/530445 by defining a target or acquisition or vulnerability zone

Abstract

An absorbent structure in an absorbent article, such as a diaper, an incontinence guard, a sanitary napkin or like article. The structure includes a liquid-acquisition and liquid-dispersing core of high bulk, porous material. The core is in liquid communication with a liquid storage part that surrounds the core at least along its longitudinally extending side-edges and which has a mean pore size that is smaller than the mean pore size of the high bulk, porous core. The density of the liquid storage part increases in a direction out towards the longitudinally extending side-edges of the absorbant structure.

Claims

1. An absorbent structure in an absorbent article selected from the group consisting of a diaper, an incontinence guard, and a sanitary napkin, the structure comprising:

mutually opposing end edges and longitudinally extending side edges extending therebetween;

a liquid storage part;

a liquid acquisition and liquid dispersing core of high bulk, porous material having an effective mean pore size and being disposed between said longitudinally extending side edges and extending over at least a substantial part of the structure in its longitudinal direction;

said liquid acquisition and liquid dispersing core being in liquid communication with the liquid storage part that surrounds the liquid acquisition and liquid dispersing core at least along long sides of said core; and

said liquid storage part having an effective mean pore size which is smaller than the effective mean pore size of the liquid acquisition and liquid dispersing core, and a density which increases in a direction outwards towards the longitudinally extending side edges of the absorbent structure.

2. The absorbent structure according to claim 1, wherein the liquid acquisition and liquid dispersing core includes a foam material or wadding material or nonwoven material comprised of synthetic fibers.

3. The absorbent structure according to claim 2, wherein the liquid acquisition and liquid dispersing core has a density of between 0.001 and 0.1 g/cm³.

4. The absorbent structure according to claim 3, wherein the density ranges between 0.005 and 0.05 g/cm³.

5. The absorbent structure according to claim 1, wherein the liquid storage part includes hydrophilic fibers, and has a density ranging between 0.1-1.0 g/cm³.

6. The absorbent structure according to, claim 5, wherein the density of the liquid storage part ranges between 0.12-0.6 g/cm³.

7. The absorbent structure according to claim 5, wherein the liquid storage part contains between 2 and 80% superabsorbent calculated on the total weight.

8. The absorbent structure according to claim 7, wherein the liquid storage part contains between 10 and 50% superabsorbent calculated on the total weight.

9. The absorbent structure according to claim 1, wherein the liquid storage part has a density of 0.1-0.4 g/cm³ at the portion closest to the liquid acquisition core.

10. The absorbent structure according to claim 9, wherein the liquid storage part has a density of 0.1-0.3 g/cm³ at the portion closest to the liquid acquisition core.

11. The absorbent structure according to claim 10, wherein the liquid storage part has a density of 0.1-0.2 g/cm³ at the portion closest to the liquid acquisition core.

12. The absorbent structure according to claim 1, wherein the liquid storage part has a density of 0.4-1.0 g/cm³ at the longitudinally extending side edges.

13. The absorbent structure according to claim 12, wherein the liquid storage part has a density of 0.5-0.8 g/cm³ at the longitudinally extending side edges.

14. The absorbent structure according to claim 13, wherein the liquid storage part has a density of 0.6-0.7 g/cm³ at the longitudinally extending side edges.

15. The absorbent structure according to claim 1, wherein in the liquid storage part, the ratio between the side edge density and the density closest to the liquid acquisition core is at least 2.

16. The absorbent structure according to claim 15, wherein the ratio is at least 3.

17. The absorbent structure according to claim 16, wherein the ratio is at least 4.

18. The absorbent structure according to claim 1, wherein the liquid storage part also has a density gradient in its longitudinal direction, such that the density of the liquid storage part increases from its central portion in a direction out towards transversely extending end parts of said structure.

19. The absorbent structure according to claim 1, wherein a substantial part of the liquid acquisition and liquid dispersing core is covered with an absorbent layer on that side of the core which lies proximal to a wearer in use, said absorbent layer being comprised either of a same material as the liquid storage part or of a different material;

said absorbent layer comprising an opening in a region of a contemplated wetting region of the absorbent structure through which the liquid acquisition and liquid dispersing core is exposed.