Absorbent article with unitary absorbent layer for center fill performance

• US 6,700,034 B1
• Filed: 10/01/1999
• Issued: 03/02/2004
• Est. Priority Date: 10/01/1999
• Status: Expired due to Fees

• Current Assignee: Kimberly-Clark Worldwide Incorporated (Kimberly-Clark Corporation)
• Original Assignee: Kimberly-Clark Worldwide Incorporated (Kimberly-Clark Corporation)
• Inventors: Lindsay, Jeffrey Dean, Chen, Fung-jou, DiPalma, Joseph
• Primary Examiner(s): Lo, Weilun
• Assistant Examiner(s): Kidwell, Michele
• Application Number:
  US09/411,261
• Time in Patent Office: 1,614 Days
• Field of Search: 604/367, 604/370, 604/378, 604/385.01, 604/385.101
• US Class Current: 604/378
• CPC Class Codes: A61F 13/4704 having preferential bending zones, e.g. fold lines or grooves
• CPC Class Codes: A61F 13/47218 with a raised crotch region, e.g. hump
• 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 13/532 inhomogeneous in the plane of the pad
• CPC Class Codes: A61F 13/53704 the layer having an inhibiting function on liquid propagation
• CPC Class Codes: A61F 13/53743 characterised by the position of the layer relative to the other layers
• CPC Class Codes: A61F 2013/4581 with absorbent core in separated pieces
• CPC Class Codes: A61F 2013/53782 with holes

Abstract

An absorbent article is disclosed comprising a unitary absorbent layer having a central portion and an outer portion divided in part but not completely separated by one or more slits along a boundary surrounding the outer portion, further comprising a wicking barrier along at least a portion of the boundary. The central portion and outer portion of the unitary absorbent layer remain contiguous across one or more joining zones. A central rising member can be disposed beneath the central portion of the unitary absorbent layer to urge the central portion toward the body of the user when compressed laterally inward. The article is able to achieve good center-fill performance when in use and maintain excellent body fit.

Claims

1. An absorbent article for use on the body of a wearer, the absorbent article having, a longitudinal centerline, two longitudinal sides, a target zone and a body side, the absorbent article comprising:

a) a liquid impervious backsheet;

b) a liquid pervious topsheet attached to the backsheet;

c) an absorbent core having a body-side surface disposed between the topsheet and the backsheet, the absorbent core comprising a unitary absorbent layer having a thickness and a width in the target zone of the absorbent article, the unitary absorbent layer comprising a central portion, an outer portion surrounding the central portion, and a boundary between the outer portion and the central portion, the boundary including one or more slits passing through the thickness of the unitary absorbent layer, the outer portion and the central portion each having a body-side surface and a garment-side surface; and

d) a wicking barrier spanning a horizontal distance above the body-side surface of the outer portion of the unitary absorbent layer and spanning a vertical distance in the one or more slits of the unitary absorbent layer, wherein the wicking barrier is at least one selected from a group consisting of substantially liquid impervious and hydrophobic material impregnated.

2. The absorbent article of claim 1, wherein the wicking barrier spans the entire thickness of the unitary absorbent layer.

3. The absorbent article of claim 1, wherein the central portion of the unitary absorbent layer has a pair of longitudinal sides each having a length, with a majority of the length of each side circumscribed by more than one slit.

4. The absorbent article of claim 1, wherein the central portion of the unitary absorbent layer has a pair of longitudinal sides each having a length, with a majority of the length of each side circumscribed by one slit.

5. The absorbent article of claim 1, wherein the central portion has three or more sides and at least two of said sides are separated from the outer portion of the unitary absorbent layer by one slit.

6. The absorbent article of claim 1, wherein the central portion has at least one pair of opposing sides and one of the one or more slits substantially separates at least the one pair of opposing sides of the central portion of the unitary absorbent layer from the outer portion of the unitary absorbent layer.

7. The absorbent article of claim 1, wherein the unitary absorbent layer further comprises a longitudinal centerline and substantially resides in a plane, wherein a rectangle in the plane of the unitary absorbent layer, substantially aligned with the longitudinal centerline of the article and fitting within the boundary between the central portion and the outer portion of the unitary absorbent layer, can have exactly three sides that are blocked by the one or more slits, such that a line extending outward in the plane of the unitary absorbent layer normal to any blocked side will intercept one of the slits.

8. The absorbent article of claim 1, wherein one of the one or more slits comprises a first substantially longitudinal segment, a substantially transverse segment, and a second substantially longitudinal segment, the first and second substantially longitudinal segments being spaced apart about the longitudinal centerline of the absorbent article, the slit defining a majority of the boundary between the outer portion and the central portion of the unitary absorbent layer.

9. The absorbent article of claim 1, wherein the central portion has a substantially rectangular shape and one slit circumscribes two or more sides of the rectangular central portion.

10. The absorbent article of claim 1, wherein the central portion has a substantially triangular shape and one slit circumscribes two or more sides of the triangular central portion.

11. The absorbent article of claim 1, wherein the central portion has two opposing sides and the opposing sides are separated by one slit.

12. The absorbent article of claim 1, wherein the one or more slits form a shape selected from a “

V”

shape, a “

U”

shape, a “

S”

shape, a “

H”

shape, an upper portion of a bread loaf shape, three sides of a rectangle, an outer perimeter of a spiral, an upper portion of an hourglass, an upper portion of a half-rounded rectangle, and an ellipse truncated at one end.

13. The absorbent article of claim 1, wherein the one or more slits circumscribe all but a substantially linear hinge zone of the central portion of the unitary absorbent layer such that a majority of the central portion of the unitary absorbent layer can be lifted away from the outer portion of the unitary absorbent layer.

14. The absorbent article of claim 1, wherein the wicking barrier passes beneath the central portion of the unitary absorbent layer.

15. The absorbent article of claim 1, further comprising a hinge zone joining the central portion to the outer portion.

16. The absorbent article of claim 1, further comprising a plurality of hinge zones joining the central portion to the outer portion.

17. The absorbent article of claim 1, wherein the wicking barrier spans a horizontal distance in contact with the body-side surface of the absorbent core.

18. The absorbent article of claim 1, wherein the wicking barrier comprises a polymeric web.

19. The absorbent article of claim 1, wherein the wicking barrier comprises a single section of a polymeric film spanning a vertical distance in one or more the slits of at least about 2 mm and a horizontal distance above the body-side surface of the outer portion of the unitary layer of at least about 2 mm.

20. The absorbent article of claim 1 wherein the wicking barrier comprises a hydrophobic impregnate.

21. The absorbent article of claim 1, wherein the boundary has a joining zone between the central portion and the outer portion of the unitary absorbent layer, wherein the joining zone is treated with the hydrophobic impregnate.

22. The absorbent article of claim 1, wherein the wicking barrier comprises a hot melt impregnated into the unitary absorbent layer.

23. The absorbent article of claim 1, wherein the wicking barrier is unitary.

24. The absorbent article of claim 1, wherein the wicking barrier is non-unitary.

25. The absorbent article of claim 1, wherein the central portion has a width equal to about 80% or less of the width of the unitary absorbent layer in the target zone.

26. The absorbent article of claim 1, further comprising a second absorbent layer disposed above the unitary absorbent layer.

27. The absorbent article of claim 26, wherein the second absorbent layer has a body-side surface and the wicking barrier spans a horizontal distance on the body-side surface of the second absorbent layer.

28. The absorbent article of claim 1, further comprising a second absorbent layer disposed below the unitary absorbent layer.

29. The absorbent article of claim 1, further comprising a deflection control element.

30. The absorbent article of claim 29, wherein the deflection control element is disposed within the central portion of the unitary absorbent layer.

31. The absorbent article of claim 29, wherein the deflection control element is disposed beneath the central portion of the unitary absorbent layer.

32. The absorbent article of claim 29, wherein the deflection control element comprises a central rising member.

33. The absorbent article of claim 29, wherein the deflection control element comprises a central inflatable member.

34. The absorbent article of claim 29, wherein the deflection control element comprises a narrow absorbent pledget disposed below the central portion of the unitary absorbent layer, the pledget having a sufficient thickness to predispose the central portion of the unitary absorbent layer to deflect upward during lateral compression.

35. The absorbent article of claim 29, wherein the deflection control element comprises bending lines in the absorbent core.

36. The absorbent article of claim 1, wherein the unitary absorbent layer further comprises a garment-side surface and a pair of spaced apart slits, and wherein the wicking barrier descends through one of the pair of slits, extends below the garment-side surface of the central portion of the unitary absorbent layer, and further ascends through the other one of the pair of slits.

37. The absorbent article of claim 36, wherein the wicking barrier extends a horizontal distance on the body-side surface of the outer portion of the unitary absorbent layer, extending laterally outward from each of the pair of spaced apart slits.

38. The absorbent article of claim 1 wherein the wicking barrier is at least substantially liquid impervious.

39. An absorbent article for use on the body of a wearer, the absorbent article having two longitudinal sides, a target zone and a body side, the absorbent article comprising:

a) a liquid impervious backsheet;

b) a liquid pervious topsheet attached to the backsheet;

c) a unitary absorbent layer disposed between the topsheet and the backsheet, the unitary absorbent layer having a thickness, and comprising a central portion and an outer portion surrounding the central portion, the central portion and the outer portion separated by a boundary comprising a slit, the outer portion having a body-side surface; and

d) a wicking barrier spanning a horizontal distance on the surface of the outer portion of the unitary absorbent layer and spanning the thickness of the unitary absorbent layer in a portion of the slit, wherein the wicking barrier is at least one selected from a group consisting of substantially liquid impervious and hydrophobic material impregnated.

40. The absorbent article of claim 39, further comprising a deflection control element in cooperative association with the central portion of the unitary absorbent layer, wherein lateral compression causes the central portion to deflect away from the backsheet.

41. The absorbent article of claim 39 wherein the wicking barrier is at least substantially liquid impervious.

42. An absorbent article for use on the body of a wearer, the absorbent article having, a longitudinal centerline, two longitudinal sides, a target zone and a body side, the absorbent article comprising:

a) a liquid impervious backsheet;

b) a liquid pervious topsheet attached to the backsheet;

c) an absorbent core having a body-side surface disposed between the topsheet and the backsheet, the absorbent core comprising a unitary absorbent layer having a thickness and a width in the target zone of the absorbent article, the unitary absorbent layer comprising a central portion, an outer portion, and a boundary between the outer portion and the central portion, the boundary including one or more slits passing through the thickness of the unitary absorbent layer, the outer portion and the central portion each having a body-side surface and a garment-side surface; and

d) a wicking barrier spanning a horizontal distance above the body-side surface of the outer portion of the unitary absorbent layer and spanning a vertical distance in the one or more slits of the unitary absorbent layer, wherein the wicking barrier is liquid impervious.

43. The absorbent article of claim 42, wherein the wicking barrier spans the entire thickness of the unitary absorbent layer.

44. The absorbent article of claim 42, wherein the central portion of the unitary absorbent layer has a pair of longitudinal sides each having a length, with a majority of the length of each side circumscribed by more than one slit.

45. The absorbent article of claim 42, wherein the central portion of the unitary absorbent layer has a pair of longitudinal sides each having a length, with a majority of the length of each side circumscribed by one slit.

46. The absorbent article of claim 42, wherein the central portion has three or more sides and at least two of said sides are separated from the outer portion of the unitary absorbent layer by one slit.

47. The absorbent article of claim 42, wherein the central portion has at least one pair of opposing sides and one of the one or more slits substantially separates at least the one pair of opposing sides of the central portion of the unitary absorbent layer from the outer portion of the unitary absorbent layer.

48. The absorbent article of claim 42, wherein the unitary absorbent layer further comprises a longitudinal centerline and substantially resides in a plane, wherein a rectangle in the plane of the unitary absorbent layer, substantially aligned with the longitudinal centerline of the article and fitting within the boundary between the central portion and the outer portion of the unitary absorbent layer, can have exactly three sides that are blocked by the one or more slits, such that a line extending outward in the plane of the unitary absorbent layer normal to any blocked side will intercept one of the slits.

49. The absorbent article of claim 42, wherein one of the one or more slits comprises a first substantially longitudinal segment, a substantially transverse segment, and a second substantially longitudinal segment, the first and second substantially longitudinal segments being spaced apart about the longitudinal centerline of the absorbent article, the slit defining a majority of the boundary between the outer portion and the central portion of the unitary absorbent layer.

50. The absorbent article of claim 42, wherein the central portion has a substantially rectangular shape and one slit circumscribes two or more sides of the rectangular central portion.

51. The absorbent article of claim 42, wherein the slit circumscribes two or more sides of a substantially triangular central portion of the unitary absorbent layer.

52. The absorbent article of claim 42, wherein the central portion has two opposing sides and the opposing sides are separated by one slit.

53. The absorbent article of claim 42, wherein the one or more slits form a shape selected from a “

V”

shape, a “

U”

shape, a “

S”

shape, a “

H”

shape, an upper portion of a bread loaf shape, three sides of a rectangle, an outer perimeter of a spiral, an upper portion of an hourglass, an upper portion of a half-rounded rectangle, and an ellipse truncated at one end.

54. The absorbent article of claim 42, wherein the one or more slits circumscribe all but a substantially linear hinge zone of the central portion of the unitary absorbent layer such that a majority of the central portion of the unitary absorbent layer can be lifted away from the outer portion of the unitary absorbent layer.

55. The absorbent article of claim 42, wherein the wicking barrier passes beneath the central portion of the unitary absorbent layer.

56. The absorbent article of claim 42, further comprising a hinge zone joining the central portion to the outer portion.

57. The absorbent article of claim 42, further comprising a plurality of hinge zones joining the central portion to the outer portion.

58. The absorbent article of claim 42, wherein the wicking barrier spans a horizontal distance in contact with the body-side surface of the absorbent core.

59. The absorbent article of claim 42, wherein the wicking barrier comprises a polymeric web.

60. The absorbent article of claim 42, wherein the wicking barrier comprises a single section of a polymeric film spanning a vertical distance in one or more the slits of at least about 2 mm and a horizontal distance above the body-side surface of the outer portion of the unitary layer of at least about 2 mm.

61. The absorbent article of claim 42 wherein the wicking barrier comprises a hydrophobic impregnate.

62. The absorbent article of claim 42, further comprising a joining zone between the central portion and the outer portion of the unitary absorbent layer, wherein the joining zone is treated with the hydrophobic impregnate.

63. The absorbent article of claim 42, wherein the wicking barrier comprises a hot melt impregnated into the unitary absorbent layer.

64. The absorbent article of claim 42, wherein the wicking barrier is unitary.

65. The absorbent article of claim 42, wherein the wicking barrier is non-unitary.

66. The absorbent article of claim 42, wherein the central portion has a width equal to about 80% or less of the width of the unitary absorbent layer in the target zone.

67. The absorbent article of claim 42, further comprising a second absorbent layer disposed above the unitary absorbent layer.

68. The absorbent article of claim 42, further comprising a second absorbent layer disposed above the unitary absorbent layer, the second absorbent layer further comprising a body-side surface and the wicking barrier spanning a horizontal distance on the body-side surface of the second absorbent layer.

69. The absorbent article of claim 42, further comprising a second absorbent layer disposed below the unitary absorbent layer.

70. The absorbent article of claim 42, further comprising a deflection control element.

71. The absorbent article of claim 42, wherein the deflection control element is disposed within the central portion of the unitary absorbent layer.

72. The absorbent article of claim 42, wherein the deflection control element is disposed beneath the central portion of the unitary absorbent layer.

73. The absorbent article of claim 42, wherein the deflection control element comprises a central rising member.

74. The absorbent article of claim 42, wherein the deflection control element comprises a central inflatable member.

75. The absorbent article of claim 42, wherein the deflection control element comprises a narrow absorbent pledget disposed below the central portion of the unitary absorbent layer have sufficient thickness to predispose the central portion of the unitary absorbent layer to deflect upward during lateral compression.

76. The absorbent article of claim 42, wherein the deflection control element comprises bending lines in the absorbent core.

77. The absorbent article of claim 42, wherein the unitary absorbent layer further comprises a garment-side surface and a pair of spaced apart slits, and wherein the wicking barrier descends through one of the pair of slits, extends below the garment-side surface of the central portion of the unitary absorbent layer, and further ascends through the other one of the pair of slits.

78. The absorbent article of claim 77, wherein the wicking barrier extends a horizontal distance on the body-side surface of the outer portion of the unitary absorbent layer, extending laterally outward from each of the pair of spaced apart slits.

79. An absorbent article for use on the body of a wearer, the absorbent article having two longitudinal sides, a target zone and a body side, the absorbent article comprising:

a) a liquid impervious backsheet;

b) a liquid pervious topsheet attached to the backsheet;

c) a unitary absorbent layer disposed between the topsheet and the backsheet, the unitary absorbent layer having a thickness, and comprising a central portion and an outer portion separated by a boundary comprising a slit, the outer portion having a body-side surface; and

d) a wicking barrier spanning a horizontal distance on the surface of the outer portion of the unitary absorbent layer and spanning the thickness of the unitary absorbent layer in a portion of the slit, wherein the wicking barrier is liquid impervious.