Absorbent composite with three-dimensional film surface for use in absorbent disposable products

• US 5,614,283 A
• Filed: 12/22/1994
• Issued: 03/25/1997
• Est. Priority Date: 12/22/1994
• Status: Expired due to Term

• Current Assignee: Tredegar Film Products Corporation (Tredegar Corporation)
• Original Assignee: Tredegar Industries, Inc. (Tredegar Corporation)
• Inventors: Potnis, Prasad S., Francis, Michael A.
• Primary Examiner(s): WATKINS III, WILLIAM P
• Application Number:
  US08/362,224
• Time in Patent Office: 824 Days
• Field of Search: 428/74, 428/72, 428/73, 428/166, 428/178, 428/132, 428/137, 428/138, 428/131, 428/913, 604/378, 604/385.1, 604/367
• US Class Current: 428/131
• CPC Class Codes: A61F 13/5323 having absorbent material located in discrete regions, e.g. pockets
• CPC Class Codes: A61F 13/53713 the layer having a promotional function on liquid propagation in the vertical direction
• CPC Class Codes: A61F 13/53743 characterised by the position of the layer relative to the other layers
• CPC Class Codes: A61F 2013/53765 characterized by its geometry
• CPC Class Codes: A61F 2013/53782 with holes
• CPC Class Codes: Y10S 428/913 Material designed to be responsive to temperature, light, moisture
• CPC Class Codes: Y10T 428/234 including elements cooperating to form cells
• CPC Class Codes: Y10T 428/236 Honeycomb type cells extend perpendicularly to nonthickness layer
• CPC Class Codes: Y10T 428/237 Noninterengaged fibered material encased [e.g., mat, batt, etc.]
• CPC Class Codes: Y10T 428/24273 including aperture
• CPC Class Codes: Y10T 428/24281 Struck out portion type
• CPC Class Codes: Y10T 428/24322 Composite web or sheet
• CPC Class Codes: Y10T 428/24331 including nonapertured component
• CPC Class Codes: Y10T 428/24562 Interlaminar spaces
• CPC Class Codes: Y10T 428/24661 Forming, or cooperating to form cells

Abstract

The absorbent composite comprises a three-dimensional formed film having a planar surface and three-dimensional surface defining a plurality of cavities or projections depending downwardly from a planar surface. A plurality of the cavities or projections or spaces defined by the cavities contain at least one type of absorbent material. The composite is useful in a fluid absorbent product having at least one liquid pervious layer and at least one liquid impervious layer where the absorbent composite is positioned between the liquid pervious layer and the liquid impervious layer.

Claims

1. An absorbent composite comprising a three-dimensional fluid impermeable, formed film having a planar surface and a three-dimensional surface which defines a plurality of cavities depending downwardly from the planar surface, the cavities providing dimensional stability to the formed film to substantially prevent collapse of the absorbent structure, wherein a plurality of the cavities contain at least one type of absorbent material;

and at least one fluid distribution material positioned adjacent the planar surface of the formed film.

2. The absorbent composite of claim 1, wherein the absorbent material comprises at least one hydrogel material, cellulose material or mixtures thereof.

3. The absorbent composition of claim 1, wherein the liquid distribution material comprises a perforated formed film.

4. The absorbent composite of claim 1, wherein the liquid distribution material comprises a nonwoven fibrous material.

5. The absorbent composite of claim 1, wherein the absorbent composite further comprises at least one additional type of absorbent material positioned adjacent the planar surface and within at least a plurality of the cavities of the formed film.

6. The absorbent composite of claim 5, wherein the additional absorbent material comprises a coating of absorbent material on the planar surface and within the cavities of the formed film.

7. The absorbent composite of claim 6, wherein the additional absorbent material comprises a fibrous web.

8. The absorbent composite of claim 1, wherein at least a portion the cavities of the formed film are distributed in a pattern.

9. The absorbent composite of claim 8, wherein the cavities of the formed film are present in a honeycomb pattern.

10. The absorbent composite of claim 1, wherein a plurality of the cavities have a frustro-conical shape.

11. The absorbent composite of claim 1, wherein the cavities define an opening in the plane of the film and an apex remote from the plane of the film.

12. The absorbent composite of claim 11, wherein the cavities are defined by walls which taper from the opening toward the apex such that each opening in the plane of the film has a first cross-section or diameter and each apex has a second cross-section or diameter smaller than the cross-section or diameter of the opening.

13. The absorbent composite of claim 1, wherein the three-dimensional formed film is a monolayer film comprising at least one polyolefin resin.

14. The absorbent composite of claim 1, wherein the three-dimensional formed film comprises a coextruded film having a top layer, and a lower layer, the lower layer comprising at least one polyolefin resins.

15. The absorbent film composite of claim 14, wherein the top layer comprises ethylene vinyl acetate.

16. The absorbent composite of claim 1, wherein the absorbent material is adhered to the formed film with a suitable adhesive.

17. The absorbent composite of claim 1, wherein the absorbent material is adhered to the formed film by applying heat, radiant or ultrasonic energy to the absorbent composite.

18. The absorbent composite of claim 16, wherein the absorbent core is adhered to the formed film by applying the suitable adhesive to a plurality of the cavities prior to substantially filling the cavities with the absorbent material.

19. The absorbent composite of claim 16, wherein the absorbent material is adhered to the formed film by applying the suitable adhesive to a plurality of the cavities after substantially filling the cavities with the absorbent material.

20. A fluid absorbent article comprising at least one liquid pervious layer, at least one liquid impervious layer, and at least one absorbent layer comprising the absorbent composite of claim 1 positioned between the liquid pervious layer and the liquid impervious layer.

21. An absorbent composite comprising a three-dimensional perforated formed film having a planar surface, and a three-dimensional surface which defines a plurality of projections depending from the planar surface, each projection defining an aperture which has a first, open end in the plane of the film and a second, open end positioned in a spaced apart relationship from the first open end, the planar surface of the film and each projection further defining a space;

at least one type of absorbent material positioned in a plurality of the spaces defined between the projections depending from the planar surface of the formed film, the absorbent material being in substantial communication in the spaces defined between the projection; and

,

at least one liquid distribution material positioned adjacent the second open ends of the apertures defined by the projections depending from the planar surface of the three-dimensional formed film.

22. The absorbent composite of claim 21, wherein the absorbent material comprises at least one hydrogel material, cellulose material or mixtures thereof.

23. The absorbent composite of claim 21, wherein the liquid distribution material comprises a nonwoven fibrous material.

24. The absorbent composite of claim 21 further comprising at least one further liquid distribution layer positioned adjacent the planar surface of the perforated formed film.

25. The absorbent material of claim 24, wherein the further liquid distribution layer comprises a perforated formed film.

26. The absorbent material of claim 24, wherein the further liquid distribution layer comprises a nonwoven fibrous material.

27. The absorbent composite of claim 21, wherein the absorbent composite further comprises at least one additional type of absorbent material positioned within a plurality of the spaces defined by the projections of the formed film.

28. The absorbent composite of claim 27, wherein the additional absorbent material comprises a coating of absorbent material on the planar surface and the projections of the formed film.

29. The absorbent composite of claim 28, wherein the additional absorbent material comprises a fibrous web.

30. The absorbent composite of claim 21, wherein at least a portion of the apertures of the formed film are distributed in a pattern.

31. The absorbent composite of claim 30, wherein the apertures of the formed film are present in a honeycomb pattern.

32. The absorbent composite of claim 21, wherein a plurality of apertures have a frustro-conical shape.

33. The absorbent composite of claim 21, wherein the apertures are defined by the projections which taper from the first open end toward the second open end.

34. The absorbent composite of claim 21, wherein the formed film is a monolayer comprising at least one polyolefin resin.

35. The absorbent composite of claim 21, wherein the formed film comprises a coextruded film having a top layer and a lower layer, the lower layer comprising at least one polyolefin resin.

36. The absorbent composite of claim 35, wherein the top layer comprises ethylene vinyl acetate.

37. The absorbent composite of claim 21, wherein the absorbent material is adhered to the formed film with a suitable adhesive.

38. The absorbent composite of claim 25, wherein the absorbent material is adhered to the formed film by applying heat, radiant or ultrasonic energy to the absorbent composite.

39. The absorbent composite of claim 37, wherein the absorbent core is adhered to the formed film by applying the suitable adhesive to a plurality of the cavities prior to substantially filling the cavities with the absorbent material.

40. The absorbent composite of claim 37, wherein the absorbent core is adhered to the formed film by applying the suitable adhesive to a plurality of the cavities after substantially filling the cavities with the absorbent material.

41. A fluid absorbent article comprising at least one liquid pervious layer, at least one liquid impervious layer and at least one absorbent layer comprising the absorbent composite of claim 21 positioned between the liquid pervious layer and the liquid impervious layer.