Disposable absorbent article core integrity support

• US 5,397,317 A
• Filed: 12/16/1993
• Issued: 03/14/1995
• Est. Priority Date: 12/16/1993
• Status: Expired due to Term

• Current Assignee: The Procter & Gamble Company
• Original Assignee: The Procter & Gamble Company
• Inventors: Thomas, Dennis A.
• Primary Examiner(s): Green, Randall L.
• Assistant Examiner(s): ZUTTARELLI, ANTHONY
• Application Number:
  US08/149,410
• Time in Patent Office: 453 Days
• Field of Search: 604/358, 604/365-367, 604/369-370, 604/372, 604/378, 604/382, 604/384, 604/385.1, 604/391
• US Class Current: 604/382
• CPC Class Codes: A61F 13/539 characterised by the connection of the absorbent layers with each other or with the outer layers

Abstract

A technique to preserve absorbent core integrity in a disposable article is described.

Columns which protrude from the backing sheet of an absorbent disposable article or personal wear garment and which project into the fibrous mass of an absorbent core overlaid onto a liquid impervious backing sheet are disclosed. A top sheet which is pervious to liquids overlies the core of fibrous material encapsulating the absorbent core in cooperation with the backing sheet. The top sheet also may carry similar columns. These columns act to restrict the movement of the fibers in the absorbent core and, more particularly, to enhance and maintain the integrity of the absorbent core whenever wet and/or placed under stress. These columns serve to resist and to diminish any disintegration of the absorbent core.

Claims

1. A disposable absorbent product comprising:

a backing sheet of a flexible sheet material, said backing sheet impervious to liquids and having a margin;

a top sheet of a flexible sheet material, said cover sheet pervious to liquids and having a margin;

said backing sheet and said top sheet separated by a mass of absorbent material;

said backing sheet having disposed on a first surface thereof, said first surface being adjacent said absorbent material, a plurality of individual columnar stabilizing means for mechanically stabilizing said absorbent material, said columnar stabilizing means being joined to said backing sheet and inserted into said absorbent material;

said top sheet and said backing sheet joined at said margins, thereby limiting movement of said absorbent material relative to said sheets.

2. The disposable absorbent product of claim 1 is a disposable diaper, wherein said diaper further comprises retaining means for retaining said product on and relative to a wearer.

3. The disposable absorbent product of claim 1 wherein each stabilizing means comprises a thermally sensitive material attached to said backing sheet and projecting from said backing sheet.

4. The disposable absorbent product of claim 3 wherein said stabilizing means project into and engages with said absorbent material.

5. The disposable absorbent product of claim 4 further comprising a further plurality of said columnar stabilizing means for stabilizing said backing sheet relative to fibrous material contacted with said product, formed onto and attached to a second surface of said backing sheet.

6. The disposable absorbent product of claim 3 wherein said stabilizing means comprises a distal end formed in a hook shape, whereby when engaged with said absorbent material, said hook shaped distal end will resist withdrawal from said absorbent material.

7. The disposable absorbent product of claim 4 wherein said stabilizing means comprises a distal end formed in a hook shape, whereby when engaged with said absorbent material, said hook shaped distal end will resist withdrawal from said absorbent material.

8. The disposable absorbent product of claim 6 wherein said columnar stabilizing means forms an included angle with said backing sheet of from about 45 degrees to 90 degrees.

9. The disposable absorbent product of claim 7 wherein said columnar stabilizing means forms an included angle with said backing sheet of from about 45 degrees to 90 degrees.

10. A disposable absorbent article for absorbing human fluid excretions, comprising:

a liquid impervious sheet having at least two faces and margins;

an absorbent batt disposed on one of said two faces of said sheet;

a liquid pervious layer overlying said sheet and said absorbent batt, whereby said batt is intermediate said layer and said sheet;

said sheet having a plurality of individual columns formed on at least one face of said sheet, wherein said columns penetrate into and mechanically stabilize said batt.

11. The disposable absorbent article of claim 10 further comprising said columns formed on two faces of said sheet, thereby forming a bed pad.

12. The disposable absorbent article of claim 10 wherein said absorbent batt is contained within an envelope of liquid pervious material, said envelope disposed between said liquid impervious sheet and said liquid pervious layer, said columns penetrating said envelope and said batt.

13. The disposable absorbent article of claim 12 further comprising said columns formed on two faces of said sheet, thereby forming a bed pad.

14. The disposable absorbent article of claim 10 further comprising a plurality of columns joined to and projecting from said liquid pervious layer into said batt.

15. The disposable absorbent article of claim 12 further comprising a plurality of columns joined to and projecting from said liquid pervious layer into said batt.

16. A method of maintaining integrity of and stabilizing an absorbent batt in a disposable absorbent article comprising the steps of:

a. providing a first sheet of material with two faces;

b. forming a plurality of individual columns on at least one of said faces on said sheet;

c. depositing an absorbent batt onto said columns;

d. inserting said columns into and mechanically stabilizing said absorbent batt;

e. providing a liquid pervious sheet having two faces; and

f. disposing said liquid pervious sheet overlying said first sheet and said absorbent batt.

17. The method of claim 16 including further steps of:

forming a plurality of columnar projections on one of said faces of said liquid pervious sheet and disposing said liquid pervious sheet with said columns projecting toward said absorbent batt, and

joining said liquid pervious sheet with said first sheet.

18. The method of claim 16 wherein said steps of forming a plurality of columns further comprises the steps of:

1) providing a gravure printing surface having cells or apertures therein;

2) filling said cells or apertures with a thermally sensitive material for transfer to a print receiving face of said first sheet;

3) contacting and joining said thermally sensitive material with said print receiving face of said first sheet;

4) separating said first sheet from said printing surface;

5) stringing said thermally sensitive material to form a plurality of columns.

19. The method of claim 17 wherein said steps of forming a plurality of columns further comprises the steps of:

1) providing a gravure printing surface having cells or apertures therein;

2) filling said cells or apertures with a thermally sensitive material for transfer to a face of said first sheet and said liquid pervious sheet;

3) contacting and joining said thermally sensitive material with said face of said liquid pervious sheet and said first sheet;

4) separating said first sheet and said liquid pervious sheet from said printing surface;

5) stringing said thermally sensitive material to form a pile of columns.

20. The method of claim 19 including the further steps of trimming said columns on said first and liquid pervious sheets to a substantially uniform height from each of said sheets.