Stretchable absorbent composite

• US 4,891,258 A
• Filed: 12/22/1987
• Issued: 01/02/1990
• Est. Priority Date: 12/22/1987
• Status: Expired due to Term

• Current Assignee: Kimberly-Clark Worldwide Incorporated (Kimberly-Clark Corporation)
• Original Assignee: Kimberly-Clark Corporation
• Inventors: Fahrenkrug, Anne M.
• Primary Examiner(s): Bell, James J.
• Application Number:
  US07/137,291
• Time in Patent Office: 742 Days
• Field of Search: 428/131, 428/138, 428/184, 428/185, 428/186, 428/152, 428/284, 428/287, 428/913, 428/178, 156/163, 156/164
• US Class Current: 428/138
• CPC Class Codes: A61F 13/15203 Properties of the article, e.g. stiffness or absorbency chemical aspects A61L15/00
• CPC Class Codes: A61F 13/15699 Forming webs by bringing together several webs, e.g. by laminating or folding several webs, with or without additional treatment of the webs
• CPC Class Codes: A61F 13/49007 Form-fitting, self-adjusting disposable diapers
• CPC Class Codes: A61F 13/53713 the layer having a promotional function on liquid propagation in the vertical direction
• CPC Class Codes: A61F 13/53717 the layer having a promotional function on liquid propagation in the horizontal direction
• CPC Class Codes: A61F 13/53747 the layer is facing the topsheet layer is part of the topsheet A61F13/511
• CPC Class Codes: A61F 2013/4587 with channels or deep spot depressions on the upper surface A61F13/4704 and A61F13/49001 take precedence
• CPC Class Codes: A61F 2013/49042 with only stretchable part, i.e. part being not elastic but only extensible with not a full recovery of its original length
• CPC Class Codes: A61F 2013/4958 with a faecal management layer
• CPC Class Codes: A61F 2013/51429 being elastomeric or stretchable sheet
• CPC Class Codes: A61F 2013/53445 from several sheets
• CPC Class Codes: A61F 2013/53908 with adhesive
• CPC Class Codes: A61F 2013/5395 with thermoplastic agent, i.e. softened by heat
• CPC Class Codes: B32B 2307/51 Elastic
• CPC Class Codes: B32B 2307/726 Permeability to liquids, absorption
• CPC Class Codes: B32B 2459/00 Nets, e.g. camouflage nets
• CPC Class Codes: B32B 27/08 of synthetic resin
• CPC Class Codes: B32B 27/32 comprising polyolefins comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30
• CPC Class Codes: B32B 3/266 characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
• CPC Class Codes: B32B 3/30 characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs apertured layer B32B3/266; layer with cavities or internal voids B32B3/26
• CPC Class Codes: B32B 37/144 : using layers with different mechanical or chemical conditions or properties, e.g. layers with different thermal shrinkage, layers under tension during bonding constructional features for tensioning B32B38/1825
• CPC Class Codes: B32B 7/02 : Physical, chemical or physicochemical properties
• CPC Class Codes: Y10S 428/913 : Material designed to be responsive to temperature, light, moisture
• CPC Class Codes: Y10T 428/24273 : including aperture
• CPC Class Codes: Y10T 428/24331 : including nonapertured component
• CPC Class Codes: Y10T 428/24446 : Wrinkled, creased, crinkled or creped
• CPC Class Codes: Y10T 428/24661 : Forming, or cooperating to form cells
• CPC Class Codes: Y10T 428/24711 : Plural corrugated components
• CPC Class Codes: Y10T 442/601 : Nonwoven fabric has an elastic quality
• CPC Class Codes: Y10T 442/66 : Additional nonwoven fabric is a spun-bonded fabric
• CPC Class Codes: Y10T 442/664 : Including a wood fiber containing layer
• CPC Class Codes: Y10T 442/668 : Separate nonwoven fabric layers comprise chemically different strand or fiber material

Abstract

The stretchable composite comprises a liquid-pervious layer, liquid-impervious layer, an absorbent layer, and a stretchable layer. The stretchable layer is stretch-bonded to the other layers and, upon relaxing the stretched layer, a plurality of rugosities are formed in the liquid-pervious layer, liquid-impervious layer, and absorbent layer. A method is provided for making the composite.

Claims

1. An absorbent composite comprising:

(a) a first layer;

(b) a second layer;

(c) an absorbent positioned between said first and second layers; and

(d) an elastic layer positioned between said first layer and said absorbent, said elastic layer being resiliently stretchable in at least one direction from about 25% to 80% of an initial unstretched length with an elastic recovery of at least 10%, said elastic layer being bonded to both said first layer and said absorbent in at least a partially stretched condition wherein rugosities are formed in a substantial portion of both said absorbent and said first layer when said elastic layer is relaxed.

2. The composite of claim 1 wherein said first layer, said absorbent and said elastic layer are attached together at common bonding sites.

3. An absorbent composite comprising:

a first layer having an outer surface and an inner surface;

a second layer;

an absorbent positioned between said first and second layers, said absorbent having first and second major surfaces one of which is attached to said inner surface of said first layer; and

an elastic layer positioned between said inner surface of said first layer and said absorbent, said elastic being resiliently stretchable in at least one direction and attached in an elastically contractible condition to said inner surface of said first layer, said elastic layer extending over a substantial portion of said major surface of said absorbent and causing a plurality of rugosities to form in both said absorbent and said first layer when said elastic layer is in at least a partially relaxed condition whereby said rugosities render said absorbent elastically contractible to fit a range of user body sizes and assist in providing a dry surface adjacent to the user'"'"'s skin.

4. The composite of claim 3 wherein said elastic layer has apertures formed therethrough which facilitate fluid transport from said first layer to said absorbent.

5. The article of claim 4 wherein said elastic layer is stretchable in a direction parallel to a longitudinal axis of said composite, thereby forming rows of rugosities in said composite which extend transversely to said longitudinal axis.

6. The composite of claim 5 wherein said elastic layer is stretchable in at least two directions resulting in a wormy and wrinkled pattern exhibited throughout said absorbent article when said elastic layer is at least partially relaxed.

7. The article of claim 6 wherein said elastic layer is stretchable in perpendicularly aligned directions.

8. The composite of claim 7 wherein one of said directions is along the longitudinal axis.

9. An absorbent composite comprising:

a first layer;

a second layer;

an absorbent positioned between said first and second layers;

an elastic layer disposed between said first layer and said absorbent, said elastic layer being resiliently stretchable in at least one direction and attached in at least a partially stretched condition to said first layer, said first layer being attached to said absorbent, said elastic layer causing a plurality of rugosities to be formed in both said absorbent and said first and second layers when said elastic layer is relaxed, rendering a substantial portion of said composite elastically contractible to fit a range of user body sizes while presenting a distinctively dry surface adapted for contact with the user'"'"'s skin.

10. The composite of claim 9 wherein said elastic layer is positioned between said first layer and said absorbent, said elastic layer being apertured to facilitate fluid transport from said first layer to said absorbent.

11. The composite of claim 10 wherein said elastic layer is resiliently stretchable in a longitudinal direction thereby forming rows of rugosities which extend transversely to the longitudinal direction in said absorbent and said first and second layers.

12. The composite of claim 9 wherein said elastic layer is stretchable in at least two directions resulting in a wormy and wrinkled pattern exhibited throughout said absorbent article.

13. The composite of claim 12 wherein said elastic layer is stretchable in perpendicularly-aligned directions.

14. The composite of claim 13 wherein one of said directions is along the longitudinal axis.

15. The composite of claim 9 wherein said first layer comprises a liquid pervious bodyside cover wherein a plurality of rugosities are formed in said cover when said elastic layer is relaxed, presenting a wrinkled body-contacting surface having a distinctively soft and dry feel to the skin of the user.

16. The composite of claim 12 comprising a liquid transfer layer positioned between said elastic layer and said cover.

17. The composite of claim 16 wherein said elastic layer has an initial, unstretched length and is stretchable to more than about 25% of said initial length.

18. The composite of claim 17 wherein said elastic layer is stretchable from about 10% to 800% of said initial length.

19. The composite of claim 18 wherein said elastic layer has an elastic recovery of at least 10% of said stretched length.

20. The composite of claim 19 wherein said absorbent, said elastic layer, said second layer and said cover are attached together at common bonding sites.

21. An absorbent composite comprising:

a liquid pervious layer;

a liquid-impervious layer;

an absorbent positioned between said liquid pervious and impervious layers, said absorbent having first and second surfaces;

an elastic layer positioned between said liquid pervious layer and one of said first and second surfaces of said absorbent, said elastic layer being resiliently stretchable in at least one direction and attached to said liquid pervious layer and to said absorbent in a stretched condition, forming rugosities in said absorbent and said liquid pervious layer when said elastic layer is relaxed, thereby rendering a substantial portion of said absorbent elastically contractible to allow said article to fit a range of user body sizes.

22. The article of claim 21 wherein said elastic layer comprises a continuous sheet of material which is apertured.

23. The composite of claim 22 wherein said elastic sheet comprises a nonwoven web.

24. The composite of claim 23 wherein said elastic sheet, said absorbent and both said liquid pervious and liquid-impervious layers are attached together at common bond sites.

25. The composite of claim 21 wherein said elastic layer is resiliently stretchable from about 25% to 800% of an initial length and exhibits a recovery of at least 10% back to said initial length.

26. The composite of claim 25 wherein said elastic layer is stretchable in a longitudinal direction corresponding to the longitudinal axis of said composite, forming rows of rugosities which extend in an essentially transverse direction relative to the longitudinal axis when said elastic layer is relaxed.

27. The composite of claim 26 further comprising air pockets formed between adjacent rugosities when said article is in an at least partially relaxed condition.

28. The composite of claim 27 wherein said elastic layer is stretched in said transverse direction to form wrinkles in said absorbent and cause said liquid pervious layer to acquire a wormy appearance when said elastic layer is relaxed.

29. An absorbent composite comprising:

a liquid pervious cover;

a liquid-impervious baffle;

an absorbent positioned between said cover and baffle, said absorbent having first and second surfaces;

a liquid transfer layer positioned between said cover and said first surface of said absorbent for transferring liquid deposited on said cover generally in the Z directions toward said absorbent;

a wicking layer positioned between said second surface of said absorbent and said baffle for wicking liquid generally in the X- and Y-directions; and

an elastic layer positioned between said transfer layer and said first surface of said absorbent, said elastic layer being resiliently stretchable from about 25% to 800% of an initial length in a direction corresponding to the longitudinal axis of said composite wherein said elastic layer is attached in a stretched condition to said liquid transfer layer whereby rugosities are formed in said absorbent, said transfer layer and said elastic layer when said elastic layer is relaxed, rendering a substantial portion of said composite elastically contractible to fit a range of user body sizes.

30. The composite of claim 29 wherein said stretched elastic layer is bonded to said bodyside cover, said transfer layer, said wicking layer, said absorbent and said baffle at common bonding sites.