Thin absorbent article having rapid uptake of liquid

• US 5,509,915 A
• Filed: 07/22/1993
• Issued: 04/23/1996
• Est. Priority Date: 09/11/1991
• Status: Expired due to Term

• Current Assignee: Kimberly-Clark Worldwide Incorporated (Kimberly-Clark Corporation)
• Original Assignee: Kimberly-Clark Corporation
• Inventors: Gossen, Barbara A., Everett, Rob D., Stevens, Robert A., Grube, Violet M., Wentzel, Tom K., Yarbrough, Sandra M., LeMahieu, David K., Hanson, William D., Brud, Lynn C., Iwanski, David G., Zunker, MaryAnn, Qin, Jian, Zenker, David L., Ellis, Clifford J., Byerly, Shannon K.
• Primary Examiner(s): Green, Randall L.
• Assistant Examiner(s): CLARKE, ROBERT A
• Application Number:
  US08/096,654
• Time in Patent Office: 1,006 Days
• Field of Search: 604/358, 604/378, 604/366-368, 604/381, 604/383, 604/385.1, 604/385.2
• US Class Current: 604/378
• CPC Class Codes: A61F 13/15203 Properties of the article, e.g. stiffness or absorbency chemical aspects A61L15/00
• CPC Class Codes: A61F 13/49011 the elastic means is located at the waist region
• CPC Class Codes: A61F 13/491 specially adapted for gender distinct urine discharge pattern
• CPC Class Codes: A61F 13/512 characterised by its apertures, e.g. perforations
• CPC Class Codes: A61F 13/513 characterised by its function or properties, e.g. stretchability, breathability, rewet, visual effect; having areas of different permeability
• CPC Class Codes: A61F 13/531 having a homogeneous composition through the thickness of the pad A61F13/538, A61F13/539 take precedence
• CPC Class Codes: A61F 13/537 characterised by a layer facilitating or inhibiting flow in one direction or plane, e.g. a wicking layer A61F13/538 takes precedence
• CPC Class Codes: A61F 2013/15365 Dimensions
• CPC Class Codes: A61F 2013/51409 being a film
• CPC Class Codes: A61F 2013/530007 being made from pulp
• CPC Class Codes: A61F 2013/530014 being made in hard wood pulp
• CPC Class Codes: A61F 2013/530029 being made from cotton
• CPC Class Codes: A61F 2013/530131 being made in fibre but being not pulp
• CPC Class Codes: A61F 2013/530226 with polymeric fibres
• CPC Class Codes: A61F 2013/530233 being thermoplastic fibres
• CPC Class Codes: A61F 2013/53024 being bicomponent fibres
• CPC Class Codes: A61F 2013/530255 being hydrophobic fibres
• CPC Class Codes: A61F 2013/530299 being hydrophilic fibres
• CPC Class Codes: A61F 2013/530328 being mineral fibres, e.g. glass
• CPC Class Codes: A61F 2013/530343 being natural fibres
• CPC Class Codes: A61F 2013/53035 : of cotton
• CPC Class Codes: A61F 2013/530437 : having a part with elevated absorption means
• CPC Class Codes: A61F 2013/530481 : having superabsorbent materials, i.e. highly absorbent polymer gel materials
• CPC Class Codes: A61F 2013/530569 : characterized by the particle size
• CPC Class Codes: A61F 2013/530583 : characterized by the form
• CPC Class Codes: A61F 2013/530591 : in granules or particles
• CPC Class Codes: A61F 2013/530613 : in fibres
• CPC Class Codes: A61F 2013/5307 : characterized by the quantity or ratio of superabsorbent material
• CPC Class Codes: A61F 2013/530708 : characterized by the absorbency properties
• CPC Class Codes: A61F 2013/530766 : by the cross-link factor
• CPC Class Codes: A61F 2013/530802 : characterized by the foam or sponge other than superabsorbent A61F2013/530649 takes precedence
• CPC Class Codes: A61F 2013/53445 : from several sheets
• CPC Class Codes: A61F 2013/53721 : with capillary means
• CPC Class Codes: A61F 2013/53795 : being a surge management layer
• CPC Class Codes: A61F 2013/53908 : with adhesive
• CPC Class Codes: A61F 2013/53916 : with epicyclical pattern
• CPC Class Codes: A61F 2013/8488 : including testing apparatus
• CPC Class Codes: A61F 2013/8491 : including test methods
• CPC Class Codes: A61L 15/60 : Liquid-swellable gel-forming materials, e.g. super-absorbents

Abstract

Generally stated, the present invention provides a distinctive absorbent article comprising a backsheet layer, and a topsheet layer which is disposed in facing relation with the backsheet layer. An absorbent body is interposed between the backsheet layer and topsheet layer. The absorbent body includes a retention portion which comprises a matrix of substantially hydrophilic fibers having a distribution of high-absorbency particulate material therein. The hydrophilic fibers and high-absorbency particles can be provided in a fiber-to-particle weight ratio within the range of about 70:30 to about 30:70. A surge management layer, comprising bicomponent fibers having a denier of not more than about 3 d, is located adjacent at least one major, facing surface of the topsheet layer, and can cooperate with the article components to provide for a liquid Penetration Rate index of not less than about 2.67 ml/sec.

Claims

1. An absorbent article, comprising:

a backsheet layer;

a fibrous, liquid permeable topsheet layer for positioning against a wearer'"'"'s skin, said topsheet layer having length and width dimensions and disposed in facing relation with said backsheet layer;

an absorbent retention portion which is interposed between said backsheet layer and topsheet layer, said retention portion having length and width dimensions smaller than corresponding dimensions of said topsheet layer and comprising a matrix of substantially hydrophilic fibers having a distribution of high-absorbency particle material therein, said hydrophilic fibers and high-absorbency particles provided in a fiber-to-particle ratio which is not more than about 70;

30 and is not less than about 30;

70 by weight;

a fibrous surge management layer which is arranged to transport liquid therethrough and includes bicomponent fibers having a denier of not more than about 3 d, said surge management layer having a facing surface thereof located in an adjacent, facing relation with at least one major, facing surface of said topsheet layer and thereby arranged to transport liquid between said facing surface of said surge management layer and said adjacent facing surface of said topsheet layer;

a multi-element wrapsheet which is located between said backsheet layer and said surge management layer and is placed adjacent major surfaces of said retention portion;

said multi-element wrapsheet including a bodyside wrap layer and a separate outerside wrap layer, each of which extends past all or some peripheral edges of said fiber matrix to provide an outwardly protruding flange-type bonding region over which an entire or partial periphery of the bodyside wrap layer is connected to an entire or partial periphery of the outerside wrap layer.

2. An article as recited in claim 1, wherein said surge layer is arranged to provide a surge layer basis weight within the range of about 17-102 gsm, with about 0-75 wt. % of said surge layer composed of fibers having a denier of at least about 3 d with about 25-100 wt % of said surge layer composed of bicomponent fibers having a denier of not more than about 3 d.

3. An article as recited in claim 2, wherein said surge layer has a basis weight within the range of about 24-68 gsm.

4. An article as recited in claim 3, wherein said surge layer has a basis weight which is within the range of about 40-60 gsm.

5. An article as recited in claim 4, wherein said surge layer has a basis weight within the range about 45-55 gsm.

6. An article as recited in claim 1, wherein said surge management layer provides for a Penetration Rate index of not less than about 2.67 ml/sec and not more than about 10 ml/sec.

7. An article as recited in claim 6, wherein said surge management layer provides for Flowback index (FIFE) of not more than about 12 gm.

8. An absorbent article as recited in claim 1 wherein said high-absorbency particles provide a Deformation Under Load of not more than about 0.6 mm.

9. An absorbent article as recited in claim 8 wherein said high-absorbency particles provide an Absorbent Capacity (AC) of at least about 28 grams per gram.

10. An absorbent article as recited in claim 9 wherein said high-absorbency particles provide an Wicking Index (WI) of at least about 10 cm.

11. An absorbent article as recited in claim 1, wherein said surge management layer provides for a Fibril Projection index of at least about 5.

12. An absorbent article as recited in claim 1, wherein at least about 70% of the pore volume in said surge management layer is provided by pores having equivalent capillary radii within the range of about 40-220 micrometers.

13. An absorbent article as recited in claim 1, wherein at least about 60% of the pores within said surge management layer are within the range of about 60-180 micrometers.

14. An absorbent article as recited in claim 1, wherein at least about 40% of the pores within said surge management layer are within the range of about 80-140 micrometers.

15. An article as recited in claim 1, wherein said surge management layer is a nonwoven, bonded-carded-web, said web having a basis weight within the range of about 17-102 gsm and a density within the range of about 0.02-1.0 gm/cc, and said web including fibers having a denier within the range of about 0.9-18.

16. An article as recited in claim 15, wherein said web includes bicomponent fibers having polyethylene/polyester or polyethylene/polypropylene bicomponent structure.

17. An article as recited in claim 16, wherein said nonwoven, bonded-carded-web is composed of fibers having fiber lengths within the range of about 2.5-7.5 cm.

18. An article as recited in claim 17, wherein said web is a through-air-bonded-carded-web.

19. An article as recited in claim 17, wherein said web is an infrared-bonded-carded web.

20. An article as recited in claim 15, wherein said topsheet layer comprises a nonwoven spunbond web having a basis weight within the range of about 17-102 gsm and a density within the range of about 0.02-1.0 gm/cc.

21. An article as recited in claim 1, wherein said surge layer comprises a nonwoven bonded-carded-web which includes a fibrous bodyside layer and a fibrous outerside layer;

said body side layer having a basis weight within the range of about 10-34 gsm, and composed of polyethylene/polyester bicomponent fibers having a fiber denier within the range about 0.9-3.0 d;

said layer side layer having a basis weight within the range of about 24-44 gsm, and composed of a fiber blend, said blend comprising about 60 wt % of about 6 denier PET fibers and about 40 wt % of about 1.8 denier PE/PET or polyethylene/polypropylene bicomponent fibers.

22. An article as recited in claim 21, wherein said surge management layer is positioned on a bodyside surface of said topsheet.

23. An article as recited in claim 1, wherein said surge management layer comprises a nonwoven bonded-carded-web which includes said fibrous bodyside layer and fibrous outerside layer;

said body side layer having a basis weight within the range of about 10-34 gsm, and composed of bicomponent fibers having a fiber denier within the range of about 1.5-3.0 d;

said outerside layer having a basis weight within the range of about 24-44 gsm, and composed of a fiber blend, said blend comprising about 0-75 wt % of fibers having denier of about 3.0 d-18 d, and about 25-100 wt % of bicomponent fibers having denier of about 0.9-3 d.

24. An article as recited in claim 23, wherein said surge management layer is positioned on a bodyside surface of said topsheet.

25. An article as recited in claim 23, wherein said body side layer includes polyethylene/polyester bicomponent fibers.

26. An article as recited in claim 25, wherein said outer side layer fiber blend includes polyethylene/polyester bicomponent fibers.

27. An article as recited in claim 23, wherein said body side layer includes polyethylene/polypropylene bicomponent fibers.

28. An article as recited in claim 27, wherein the bicomponent fibers in said outer side layer fiber blend are polyethylene/polypropylene bicomponent fibers.

29. An article as recited in claim 1, wherein said retention portion comprises a mixture of woodpulp fluff and superabsorbent material, said superabsorbent material having a Deformation Under Load of about 0.60 millimeter or less, a Wicking Index of about 10 centimeters or greater and an Absorbent Capacity of about 28 grams per gram or greater.

30. An article as recited in claim 29, wherein said superabsorbent material has an Absorbency Under Load value within the range of about 25-40, and an Absorbent Capacity within the range of about 32-48.

31. An absorbent article as recited in claim 1, wherein said surge management portion and said topsheet layer each have an effective average pore size, wherein the effective average pore size of said surge management portion is larger than the effective average pore size of said topsheet layer.

32. An absorbent article as recited in claim 1, further comprising curved elastic members connected to said backsheet along longitudinally extending side edges thereof to provide elasticized leg gathers, each of said elastic members comprising a carrier sheet to which are attached a plurality of individual elastic strands.

33. An article as recited in claim 1, wherein said backsheet has a light transmission of not more than about 40%.

34. An article as recited in claim 1, further comprising a nonwettable, pigmented web interposed between said backsheet and said absorbent retention portion to provide for a light transmission of not more than about 40%.

35. An article as recited in claim 34, wherein said not wettable web comprises a meltblown web composed of polyolefin fibers.

36. An article as recited in claim 35, wherein said nonwettable meltblown web is pigmented with about 10 weight percent TiO₂ pigment.

37. An article as recited in claim 1, wherein said article provides for a whole article elastic tension of not more than about 250 gm.

38. An article as recited in claim 37, wherein said retention portion has a basis weight within the range of about 400-900 gsm and a thickness of not more than about 0.6 cm, and wherein said article provides for a whole article elastic tension value which is within the range of about 150-250 gm.

39. An absorbent article, comprising:

an absorbent retention portion which is located adjacent said backsheet layer, said retention portion comprising a matrix of substantially hydrophilic fibers having a distribution of high-absorbency particle material therein, said hydrophilic fibers and high-absorbency particles provided in a fiber-to-particle ratio which is not more than about 70;

30 and is not less than about 30;

70 by weight;

a surge management layer located over a body side surface of said retention portion, said surge layer comprising bicomponent fibers having a denier of not more than about 3 d, said surge layer constructed to provide for a liquid Penetration Rate index of not less than about 2.67 ml/sec, and said surge layer comprising a composite nonwoven bonded-carded-web which includes a fibrous bodyside layer portion an a fibrous outerside layer portion;

said body side layer portion having a basis weight within the range of about 10-34 gsm, and composed of bicomponent fibers having a fiber denier within the range of about 0.9-3.0 d;

said outer side layer portion having a basis weight within the range of about 24-44 gsm, and composed of a fiber blend, said blend comprising about 60 wt % of about 6 denier PET fibers and about 40 wt % of about 1.8 denier bicomponent fibers; and

a multi-element wrapsheet which is located between said backsheet layer and said surge management layer and is placed adjacent major surfaces of said retention portion;

said multi-element wrapsheet including a bodyside wrap layer and a separate outerside wrap layer, each of which extends past all or some peripheral edges of said fiber matrix to provide an outwardly protruding flange-type bonding region over which an entire or partial periphery of the bodyside wrap layer is connected to an entire or partial periphery of the outerside wrap layer.

40. An article as recited in claim 39, wherein said body side layer includes polyethylene/polyester bicomponent fibers.

41. An article as recited in claim 40, wherein said outer side layer fiber blend includes polyethylene/polyester bicomponent fibers.

42. An article as recited in claim 39, wherein said bicomponent fibers in said body side layer are polyethylene/propylene bicomponent fibers.

43. An article as recited in claim 42, wherein the bicomponent fibers in said outer side layer fiber blend are polyethylene/polypropylene bicomponent fibers.

44. An absorbent article, comprising:

a backsheet layer;

a fibrous, liquid permeable topsheet layer disposed in facing relation with said backsheet layer;

an absorbent retention portion which is interposed between said backsheet layer and said topsheet layer, said retention portion comprising a matrix of substantially hydrophilic fibers having a distribution of high-absorbency particle material therein, said hydrophilic fibers and high-absorbency particles provided in a fiber-to-particle ratio which is not more than about 70;

30 and is not less than about 30;

70 by weight, and said matrix defining a periphery having contoured side edges with inwardly bowed portions; and

a fibrous wrapsheet located between said backsheet layer and said topsheet layer and placed immediately adjacent major surfaces of said retention portion, said wrapsheet including a bodyside wrap layer and an outerside wrap layer, each of which extends past all or some of the peripheral edges of said fiber matrix to provide an outwardly protruding, flange-type bonding region over which an entire or partial periphery of the bodyside wrap layer is connected to a periphery of the outerside wrap layer, said wrapsheet having curved side edges which are closed about said contoured edges of said matrix by said flange-type bonding region to seal said bonding region against migration of said high-absorbency particles.

45. An absorbent article as recited in claim 44, wherein said outerside wrap layer has a relatively lower basis weight than said bodyside wrap layer.

46. An absorbent article, comprising:

a backsheet layer;

a fibrous, liquid permeable topsheet layer which is disposed in facing relation with said backsheet layer;

an absorbent retention portion which is interposed between said backsheet layer and said topsheet layer, said retention portion comprising a matrix of substantially hydrophilic fibers defining peripheral edges and having a distribution of high-absorbency particle material therein, said hydrophilic fibers and high-absorbency particles provided in a fiber-to-particle ratio which is not more than about 70;

30 and is not less than about 30;

70 by weight; and

a fibrous wrapsheet located between said backsheet layer and said topsheet layer and placed immediately adjacent major surfaces of said retention portion, said wrapsheet including a bodyside wrap layer and a separate outerside wrap layer, each of which extends past all or some of the peripheral edges of said fiber matrix to provide an outwardly protruding, flange-type bonding region over which an entire or partial periphery of the bodyside wrap layer is connected to a periphery of the outerside wrap layer, and said bodyside wrap layer having a relatively lower porosity than said outerside wrap layer.

47. An absorbent article as recited in claim 46, wherein said wrapsheet includes a hydrophilic material.

48. An absorbent article as recited in claim 46, wherein said outer side wrap layer has a relatively lower basis weight than said bodyside wrap layer.

49. An absorbent article as recited in claim 46, wherein said wrapsheet includes meltblown fibers.

50. An absorbent article as recited in claim 49, wherein said meltblown fibers are thermally bondable.

51. An absorbent article, comprising:

a backsheet layer;

a fibrous, liquid permeable topsheet layer for positioning against a wearer'"'"'s skin, said topsheet layer having length and width dimensions and disposed in facing relation with said backsheet layer;

an absorbent retention portion which is interposed between said backsheet layer and topsheet layer, said retention portion having length and width dimensions smaller than corresponding dimensions of said topsheet layer and comprising a matrix of substantially hydrophilic fibers having a distribution of high-absorbency particle material therein, said hydrophilic fibers and high-absorbency particles provided in a fiber-to-particle ratio which is not more than about 70;

30 and is not less than about 30;

70 by weight;

a fibrous surge management layer located in an adjacent, facing relation with at least one major, facing surface of said topsheet layer, said surge layer having a fibrous bodyside layer and a fibrous outerside layer comprising bicomponent fibers having a denier of not more than about 3 d, said surge layer constructed to provide for a liquid Penetration Rate index of not less than about 2.67 ml/sec; and

a multi-element wrapsheet which is located between said backsheet layer and said surge management layer and placed adjacent major surfaces of said retention portion, said multi-element wrapsheet including a bodyside wrap layer and a separate outerside wrap layer, each of which extends past all or some peripheral edges of said fiber matrix to provide an outwardly protruding, flange-type bonding region over which an entire or partial periphery of the bodyside wrap layer is connected to an entire or partial periphery of the outerside wrap layer, wherein said outerside wrap layer has a greater porosity than said bodyside wrap layer and wherein at least said bodyside wrap layer has a pore distribution wherein no more than about 5 percent of the pores, as measured by Coulter porometry, are greater than about 50 micrometers in diameter.

52. An absorbent article, comprising:

a backsheet layer;

a fibrous, liquid permeable topsheet layer disposed in facing relation with said backsheet layer;

an absorbent retention portion which is interposed between said backsheet layer and said topsheet layer, said retention portion comprising a matrix of substantially hydrophilic fibers having a distribution of high-absorbency particle material therein, said hydrophilic fibers and high-absorbency particles provided in a fiber-to-particle ratio which is not more than about 70;

30 and is not less than about 30;

70 by weight, and said matrix defining a periphery having contoured side edges with inwardly bowed portions; and

a fibrous wrapsheet located between said backsheet layer and said topsheet layer and placed immediately adjacent major surfaces of said retention portion, said wrapsheet including a bodyside wrap layer and an outerside wrap layer, each of which extends past all or some of the peripheral edges of said fiber matrix to provide an outwardly protruding, flange-type bonding region over which an entire or partial periphery of the bodyside wrap layer is connected to a periphery of the outerside wrap layer, said bodyside wrap layer having a relatively lower porosity than said outerside wrap layer, and said wrapsheet having curved side edges which are closed about said contoured edges of said matrix by said flange-type bonding region to seal said bonding region against migration of said high-absorbency particles.