Absorbent article with high stiffness

• US 6,350,257 B1
• Filed: 08/02/1999
• Issued: 02/26/2002
• Est. Priority Date: 11/15/1996
• Status: Expired due to Term

• Current Assignee: SCA Hygiene Products AB (Industrivärden AB)
• Original Assignee: SCA Hygiene Products AB (Industrivärden AB)
• Inventors: Drevik, Solgun, Gustafsson, Anders, Widlund, Urban, Samuelsson, Ann, Björklund, Camilla
• Primary Examiner(s): Ruhl, Dennis
• Application Number:
  US09/297,365
• Time in Patent Office: 939 Days
• Field of Search: 604/385.01, 604/385.17
• US Class Current: 604/385.01
• CPC Class Codes: A61F 13/4702 having a reinforcing member
• CPC Class Codes: A61F 13/47209 having only interlabial part, i.e. with no extralabial parts
• CPC Class Codes: A61F 2013/455 having a "W" shape
• CPC Class Codes: A61F 2013/49493 the edge leakage prevention means being or forming three-dimensional barrier with raised lateral side-or end-wall

Abstract

The invention relates to an absorbent article such as a sanitary napkin, an incontinence guard, or a panty-liner, which article has a generally elongated shape with a longitudinal direction and a transverse direction and exhibits two side edges (9, 10), two end portions (6, 7), and a crotch portion (8) located between the end portions (6, 7), which article further exhibits a liquid-pervious cover layer (2), intended to be facing the user during use, and a liquid-impervious cover layer (3), intended to be facing away from the user during use. The article comprises at least within the crotch portion (8) a stiffening element (15) of a material with a very high intrinsic stiffness, whereby the article in the crotch portion (8) has an extension in the transverse direction which during use of the article is between 40 mm and 15 mm and preferably is between 20 mm and 35 mm.

Claims

1. Absorbent article which article has a generally elongated shape with a longitudinal direction and a transverse direction and exhibits two side edges, two end edges, two end portions and a crotch portion located between the end portions, which article furthermore exhibits a liquid-pervious cover layer, intended to be facing the user when worn, and a liquid-impervious cover layer, intended to be facing away from the user when worn, wherein the article at least within the crotch portion comprises a stiffening element of a material with a very high intrinsic stiffness so as to maintain substantial shape permanence of the article while worn by a user, whereby within at least a 5 mm extension of the crotch portion in the longitudinal direction, the article has an extension in the transverse direction which is between 15 mm and 40 mm while the article is worn by a user.

2. Absorbent article according to claim 1, wherein the stiffening element may only be compressed to approx. 80% of its original width during compression of the crotch portion in the transverse direction of the article with forces which occur while the article is worn by a user.

3. Absorbent article according to claim 1, wherein the stiffening element is profiled in the transverse direction of the article and exhibits at least one ridge, or furrow extending in the longitudinal direction.

4. Absorbent article according to claim 3, wherein a longitudinal ridge with a rounded surface is arranged along each side edge of the article at least line the crotch portion.

5. Absorbent article according to claim 1, wherein the stiffening element in the crotch portion on both sides of the stiffening element along the side edges of the article is surrounded by soft, easily deformable edge portions.

6. Absorbent article according to claim 1, wherein a force of at least 20 N is required in order to press one of the side edges of the article inwards a distance of 10 mm during compression perpendicularly to said one of the side edges.

7. Absorbent article according to claim 1, wherein the end portions are constituted by a front portion and a rear portion, wherein the article at least within the front portion and the crotch portion exhibits high bending resistance against bending along transversely extending bending lines, whereby the front portion and the crotch portion of the article exhibit high shape permanence while the article is worn by a user, and also that the front portion of the article is inclined in relation to the crotch portion, in a direction towards the liquid-pervious surface, whereby the front portion forms an angle α

towards the crotch portion.

8. Absorbent article according to claim 7, wherein the article at least within the front portion and the crotch portion exhibit high bending resistance against bending along longitudinally extending bending lines.

9. Absorbent article according to claim 1, wherein the crotch portion of the article exhibits a transversely extending cross-sectional line, wherein the side edges of the article change inclination in relation to the longitudinal centre line of the article in the vicinity of the points of intersection between the cross-sectional line and the side edge, and from which cross-sectional line the width of the article increases in a direction towards the front edge, whereby the front portion exhibits a maximum width, which exceeds the width of the crotch portion at the cross-sectional line, wherein the tapered inclination of the side edges at the front portion is defined by means of an angle β

between each respective side edge and a longitudinal line parallel to the centre line, wherein β

is between 10° and

90°

.

10. Absorbent article according to claim 1, wherein the liquid-impervious cover layer of the article is constituted by a liquid-impervious, stiff plastic layer whereby the liquid-impervious cover layer constitutes the stiffening member of the article.

11. Absorbent article according to claim 1, wherein the absorbent article is a sanitary napkin, an incontinence guard, or a panty-liner.

12. Absorbent article according to claim 1, wherein the article has an extension in the transverse direction which is between 20 mm and 35 mm while the article is worn by a user.

13. Absorbent article, which has a generally elongated shape with a longitudinal direction and a transverse direction and exhibits two side edges, two end edges, two end portions, and a crotch portion located between the end portions, which article furthermore exhibits a liquid-pervious cover layer, intended to be facing the user when worn, and a liquid-impervious cover layer, intended to be facing away from the user when worn, wherein the article at least within the crotch portion comprises a stiffening element of a material with an intrinsic stiffness of at least about 100 N.

14. Absorbent article, which has a generally elongated shape with a longitudinal direction and a transverse direction and exhibits two side edges, two end edges, two end portions, and a crotch portion located between the end portions, which article furthermore exhibits a liquid-pervious cover layer, intended to be facing the user when worn, and a liquid-pervious cover layer, intended to be facing away from the user when worn, wherein the article at least within the crotch portion comprises a stiffening element of a material with an intrinsic stiffness of at least about 100 N, whereby within at least a 5 mm extension of the crotch portion in the longitudinal direction, the article has an extension in the transverse direction which is between 15 mm and 40 mm while the article is worn by a user.

15. Absorbent article, which article has a generally elongated shape with a longitudinal direction and a transverse direction and exhibits two side edges, two end edges, two end portions, and a crotch portion located between the end portions, which article furthermore exhibits a liquid-pervious conver layer, intended to be facing the user when worn, and a liquid-impervious cover layer, intended to be facing away from the user when worn, wherein the article at least within the crotch portion comprises a stiffening element of a material with a very high intrinsic stiffness so as to maintain sufficiently high shape stability of the article while worn by a user, whereby within at least a 5 mm extension of the crotch portion in the longitudinal direction, the article has an extension in the transverse direction which is between 15 mm and 40 mm while the article is worn by a user.

16. Absorbent article according to claim 15, wherein the stiffening element may only be compressed to approx. 80% of its original width during compression of the crotch portion in the transverse direction of the article with forces which occur while the article is worn by a user.