Absorbent article

• US 5,891,118 A
• Filed: 08/29/1996
• Issued: 04/06/1999
• Est. Priority Date: 09/05/1995
• Status: Expired due to Term

• Current Assignee: KAO Corporation
• Original Assignee: KAO Corporation
• Inventors: Yana, Yuji, Saka, Akihiko, Toyoshima, Yasuo, Hamajima, Mitsugu, Kusagawa, Tetsuya, Nakanishi, Minoru
• Primary Examiner(s): Weiss, John G.
• Assistant Examiner(s): REICHLE, KARIN M
• Application Number:
  US08/705,049
• Time in Patent Office: 950 Days
• Field of Search: 604/365-366, 604/378-383, 604/385.1, 604/386, 604/387
• US Class Current: 604/366
• CPC Class Codes: A61F 13/4755 the means being a flat barrier on or inside the absorbent article, e.g. backsheet wrapped around the edges
• CPC Class Codes: A61F 13/4756 the means consisting of grooves, e.g. channels, depressions or embossments, resulting in a heterogeneous surface level
• CPC Class Codes: A61F 13/51108 the top sheet having corrugations or embossments having one axis relatively longer than the other axis, e.g. forming channels or grooves in a longitudinal direction
• CPC Class Codes: A61F 13/512 characterised by its apertures, e.g. perforations
• CPC Class Codes: A61F 13/51305 having areas of different permeability
• CPC Class Codes: A61L 15/52 Water-repellants

Abstract

A substantially elongated absorbent article having a liquid permeable topsheet, a liquid impermeable backsheet, an absorbent member interposed between the topsheet and the backsheet, and a pair of hydrophobic areas along opposing longitudinal side portions of an upper surface of the absorbent article inwardly from longitudinal side edges of the absorbent article, the hydrophobic areas each having a continuous or discontinuous antileakage groove formed along a respective one of the longitudinal side portions, wherein a width of each of the antileakage grooves is from 0.1 mm to 20 mm, a ratio of a depth of each of the antileakage grooves with respect to a thickness of a portion of the absorbent article where no antileakage groove is formed is from 0.01 to 0.8, and the depth of each of the antileakage grooves is from 0.1 mm to 12 mm.

Claims

1. A substantially elongated absorbent article having a liquid permeable topsheet, a liquid impermeable backsheet, and an absorbent member interposed between said topsheet and said backsheet, said absorbent article further comprising:

a pair of hydrophobic areas along opposing longitudinal side portions of an upper surface of said absorbent article inwardly from longitudinal side edges of said absorbent article,

said hydrophobic areas each having a continuous or discontinuous antileakage groove formed along a respective one of the longitudinal side portions, wherein a width of each of said antileakage grooves is from 0.1 mm to 20 mm, a ratio of a depth of each of said antileakage grooves with respect to a thickness of a portion of said absorbent article where no antileakage groove is formed is from 0.01 to 0.8, and the depth of each of said antileakage grooves is from 0.1 mm to 12 mm.

2. The absorbent article according to claim 1, wherein each of said antileakage grooves has at least one hole portion so that body fluids can be introduced into said absorbent member through said at least one hole portion.

3. A method for preparing an absorbent article as defined in claim 1 or 2, which comprises;

feeding a substantially elongated absorbent article precursor comprising a topsheet, a backsheet, an absorbent member interposed between said topsheet and said backsheet and a pair of hydrophobic areas along opposing longitudinal side portions of an upper surface of said absorbent article precursor through an emboss roller thereby forming an antileakage groove in a longitudinal direction of said hydrophobic areas to produce said absorbent article.

4. The method according to claim 3, wherein said feeding step uses an emboss roller which is heated.

5. The method according to claim 3, wherein said emboss roller has a plurality of projections arranged on opposing longitudinal sides of said emboss roller.

6. The absorbent article according to claim 5, wherein the depth of each of said antileakage grooves is from 0.3 mm to 8 mm.

7. The absorbent article according to claim 2, wherein each of said antileakage grooves comprises a bottom portion and a peripheral wall portion, and said at least one hole portion is formed in an area between the bottom portion and the peripheral wall portion.

8. The absorbent article according to claim 1, wherein said hydrophobic areas are formed by providing antileakage sheets comprising said liquid impermeable backsheet or an antileakage sheet other than said liquid impermeable backsheet.

9. The absorbent article according to claim 1, wherein the width of each of the antileakage grooves is from 0.1 mm to 10 mm, the ratio of the depth of each of said antileakage grooves with respect to the thickness of a portion of said absorbent article where no antileakage groove is formed is from 0.3 to 0.8, and the depth of each of said antileakage grooves is from 1 mm to 8 mm.

10. The absorbent article according to claim 1, wherein the width of each of said antileakage grooves is from 0.1 mm to 10 mm, the ratio of the depth of each of said antileakage grooves with respect to the thickness of a portion of said absorbent article where no antileakage groove is formed is from 0.01 to 0.5, and the depth of each of said antileakage grooves is from 0.1 mm to 8 mm.

11. The absorbent article according to claim 1, wherein the width of each of said hydrophobic areas is from 3 mm to 30 mm, and a width of an absorption area located between the pair of hydrophobic areas is from 30 mm to 70 mm.

12. The absorbent article according to claim 1, wherein a distance from an inner edge of each hydrophobic area to each respective antileakage groove is from 1 mm to 20 mm and the distance from an outer longitudinal side edge of each hydrophobic area to each respective antileakage groove is 1 mm to 20 mm.

13. The absorbent article according to claim 1, further comprising a pair of flaps which are formed by extending said backsheet outwardly.

14. The absorbent article according to claim 1, wherein said topsheet covers an upper surface and longitudinal side surfaces of said absorbent member and extends outwardly from side edges of said absorbent member at a lower surface of the absorbent article to form extended portions, said extended portions adhered to extended portions of said backsheet through antileakage sheets disposed along said longitudinal side portions of the upper surface of said absorbent article, said topsheet, antileakage sheets and backsheet forming side flaps.

15. The absorbent article according to claim 1, wherein said antileakage grooves each comprise a bottom surface portion, a peripheral wall portion, and a hole portion between the bottom surface portion and the peripheral wall portion.

16. The absorbent article according to claim 15, wherein an area of said hole portion is from 0.1 mm² to 20 mm².