Absorbent article having increased front portion stiffness

• US 6,325,786 B1
• Filed: 08/12/1999
• Issued: 12/04/2001
• Est. Priority Date: 11/15/1996
• Status: Expired due to Fees

• 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): Weiss, John G.
• Assistant Examiner(s): KIDWELL, MICHELE M
• Application Number:
  US09/297,584
• Time in Patent Office: 845 Days
• Field of Search: 604/358, 604/385.01, 604/385.04, 604/385.03, 604/385.21, 604/385.23, 604/397
• US Class Current: 604/385.01
• CPC Class Codes: A61F 13/49 Absorbent articles specially adapted to be worn around the waist, e.g. diapers
• CPC Class Codes: A61F 2013/4556 having a "M" shape
• CPC Class Codes: A61F 2013/49076 as "I"-shaped

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 long sides, two short sides, two end portions and a central portion, located between the end portions, and exhibiting a transversely extending cross-sectional line from which the width of the article increases in a direction towards a short side of the article, whereby the end portion located at the short side exhibits a maximum width which is larger than the width of the central portion, whereby the article changes inclination at the cross-sectional line, whereby the inclination is defined by an angle between the long side of the article and a longitudinal line parallel to the longitudinal direction of the article, which article exhibits a width of the central portion which has an upper limit of 60 mm, and an angle of 30-90°, and the article has a stiffness, at least in the front portion, which exceeds 100 N measured according to ASTM D 4032-82.

Claims

1. An absorbent article such as a sanitary napkin, an incontinence guard or a panty-liner, which article has a generally elongate shape with a longitudinal direction and a transverse direction, said article comprising:

two long sides,

two short sides,

two end portions, said end portions including a front portion and a rear portion, and

a central portion located between the end portions and exhibiting a transversely extending cross-sectional line from which a width of the article increases in a direction towards at least one of said short sides of the article,

wherein the end portion located at said at least one of said short sides exhibits a maximum width which is larger than a width of the central portion at the cross-sectional line,

wherein the long sides of the article change inclination at the cross-sectional line, the inclination being defined by an angle α

between each long side of the article and a longitudinal line parallel to the longitudinal direction of the article, and

wherein the width of the central portion has an upper limit of 60 mm, the angle a is 30-90°

, and the article has a stiffness, at least in said front portion, which exceeds 100 N measured according to ASTM D 4032-82.

2. An absorbent article according to claim 1, further comprising a liquid-pervious layer intended to be facing a user during use, a liquid barrier layer intended to be facing away from the user during use, and an absorbent layer arranged between said liquid-pervious layer and said liquid barrier layer, and wherein a hump is arranged on the article, projecting from the liquid-pervious layer and extending in the longitudinal direction of the article at least over the central portion of the article.

3. An absorbent article according to claim 1, wherein the angle α

is 35-55°

.

4. An absorbent article according to claim 1, wherein the width of the central portion is between 15 mm and 60 mm.

5. An absorbent article according to claim 1, wherein the width of the central portion is between 15 mm and 45 mm.

6. An absorbent article according to claim 1, wherein the width of the central portion is between 20 mm and 35 mm.

7. An absorbent article according to claim 1, wherein the central portion exhibits a smaller width than both end portions.

8. An absorbent article according to claim 1, wherein the central portion exhibits an M-shaped cross-section.

9. An absorbent article according to claim 1, wherein the widest part of said end portion located at said at least one of said short sides is 1.5-5 times as wide as a narrowest width of the central portion.

10. An absorbent article according to claim 9, wherein the end portion located at said at least one of said short sides exhibits a width which, in a widest portion of the end portion, measures 1.5-3 times as large as a length of the end portion located at said at least one of said short sides.

11. An absorbent article according to claim 10, further comprising a liquid-pervious layer intended to be facing a user during use, and a liquid barrier layer intended to be facing away from the user during use, and wherein the article exhibits high rigidity towards bending along transversely extending bending lines at least within the front portion and the central portion, whereby said front portion and said central portion of the article exhibit high shape permanence during of said article, and said front portion of said article is inclined in relation to said central portion, in a direction towards said liquid-pervious layer, wherein said front portion forms an angle against said central portion (12).

12. An absorbent article according to claim 1, wherein angle α

is defined between a longitudinal line parallel to the longitudinal direction of the article and a line passing through a point where the front portion of said absorbent article begins to widen.

13. An absorbent article according to claim 1, wherein the width of the article increases in a direction towards only one of said short sides of the article, so as to define said angle α

at only one end portion.