Humor Absorbent Article

• US 20080312627A1
• Filed: 06/30/2005
• Published: 12/18/2008
• Est. Priority Date: 06/30/2004
• Status: Active Grant

• Current Assignee: DAIO Paper Corporation
• Original Assignee: DAIO Paper Corporation
• Inventors: Matsui, Tomotsugu, Takeuchi, Tomonari, Konawa, Satoko
• Granted Patent: US 8,466,334 B2
• Time in Patent Office: Days
• US Class Current: 604/375
• CPC Class Codes: A61F 13/15203 Properties of the article, e.g. stiffness or absorbency chemical aspects A61L15/00
• CPC Class Codes: A61F 13/53747 the layer is facing the topsheet layer is part of the topsheet A61F13/511
• CPC Class Codes: B32B 2260/021 Fibrous or filamentary layer layers of natural mineral fibres or particles being impregnated in a plastic substance B32B19/02
• CPC Class Codes: B32B 2260/046 Synthetic resin
• CPC Class Codes: B32B 2262/04 Cellulosic plastic fibres, e.g. rayon
• CPC Class Codes: B32B 2262/062 Cellulose fibres, e.g. cotton
• CPC Class Codes: B32B 2264/0214 Particles made of materials belonging to B32B27/00
• CPC Class Codes: B32B 2307/726 Permeability to liquids, absorption
• CPC Class Codes: B32B 2307/728 Hydrophilic
• CPC Class Codes: B32B 2555/02 Diapers or napkins
• CPC Class Codes: B32B 27/12 next to a fibrous or filamentary layer
• CPC Class Codes: B32B 27/32 comprising polyolefins comprising vinyl (co)polymers or acrylic (co)polymers B32B27/30
• CPC Class Codes: B32B 29/02 next to a fibrous or filamentary layer
• CPC Class Codes: B32B 5/022 Non-woven fabric
• CPC Class Codes: B32B 5/142 Variation across the area of the layer
• CPC Class Codes: B32B 5/145 Variation across the thickness of the layer
• CPC Class Codes: B32B 5/245 another layer next to it being a foam layer
• CPC Class Codes: B32B 5/26 another layer next to it also being fibrous or filamentary relative arrangement of fibres or filaments of different layers B32B5/12

Abstract

[Subject] To obtain a body fluid absorbent article with the perfect protection against the body fluid leakage.

[Means for Solving Problem] In the body fluid absorbent, the body fluid retainable absorbent member 53A is disposed under the face sheet 51. Then, the body fluid permeable absorbent member 52, which include the assembly of fibers in tows, is disposed between the face sheet 51 and the body fluid retainable absorbent member 53A.

Claims

1. A body fluid absorbent article having a body fluid absorbent structure with a body fluid retainable absorbent member disposed under a face sheet, comprising a body fluid permeable absorbent member, which is interposed between said face sheet and said body fluid retainable absorbent member, and which includes an assembly of fibers in tows.

2. A body fluid absorbent article as defined in claim 1, wherein said body fluid retainable absorbent member is formed with an absorbent member obtained by moving absorbent polymer into an assembly of fibers in tows.

3. A body fluid absorbent article as defined in claim 1, wherein binder is added to said assembly of fibers in tows in at least one of said body fluid retainable absorbent member and said body fluid permeable absorbent member.

4. A body fluid absorbent article as defined in claim 3, wherein by adding said binder, contacting portions of said fibers are adhered or fused in the form of at least one of a line and dot.

5. A body fluid absorbent article as defined in claim 4, wherein said assembly of fibers in tows comprises at least two zones being different in adhesion degree or fusion degree of said fibers by adjusting the added amount of binder.

6. A body fluid absorbent article as defined in claim 5, wherein, in said assembly of fibers in tows, the adhesion degree or fusion degree of said fibers at a middle portion in the width direction is stronger than the adhesion degrees or fusion degrees of said fibers at both side portions in the width direction by adjusting the added amount of binder to said middle portion so as to be larger than the added amount of binder to said both side portions.

7. A body fluid absorbent article as defined in claim 5, wherein, in said assembly of fibers in tows, the adhesion degrees or fusion degrees of the fibers at both side portions in the width direction are stronger than the adhesion degree or fusion degree of said fibers at a middle portion in the width direction by adjusting the added amount of binder to said both side portions so as to be larger than the added amount of binder to said middle portion.

8. A body fluid absorbent article as defined in claim 5, wherein, in said assembly of fibers in tows, the adhesion degrees or fusion degrees of said fibers at a portion near a top face and a portion near a bottom face are stronger than the adhesion degree or fusion degree of said fibers at an intermediate portion between the top face and the bottom face by adjusting the added amount of binder to said portion near the top face and to said portion near the bottom face so as to be larger than the added amount of binder to said intermediate portion.

9. A body fluid absorbent article as defined in claim 5, wherein, in said assembly of fibers in tows, the adhesion degrees or fusion degrees of said fibers at a portion near a top face and at a portion near a bottom face and at both side end portions on the cross section in the width direction are stronger than the adhesion degree or fusion degree of said fibers at a central portion by adjusting the added amount of binder to said portion near the top face and to said portion near the bottom face and to said both side end portions so as to be larger than the added amount of binder to said central portion.

10. A body fluid absorbent article as defined in claim 5, wherein, in the above assembly of fibers in tows, the adhesion degrees or fusion degrees of said fibers at both side end portions on the cross section in the width direction are stronger than the adhesion degree or fusion degree of said fibers at an intermediate portion on the cross section in the width direction by adjusting the added amount of binder to said both side end portions so as to be larger than the added amount of binder to said midway portion.

11. A body fluid absorbent article as defined in claim 5, wherein, in said assembly of fibers in tows, the adhesion degree or fusion degree of said fibers at an intermediate portion on the cross section in the width direction is stronger than the adhesion degrees or fusion degrees of said fibers at both side end portions on the cross section in the width direction by adjusting the added amount of binder to said midway portion so as to be larger than the added amount of binder to said both side end portions.

12. A body fluid absorbent article as defined in claim 1, wherein an absorbent member made of an absorbent material other than the tow is laminated on the under surface of said body fluid retainable absorbent member.

13. A body fluid absorbent article as defined in claim 12, wherein said absorbent material other than the tow comprises at least one of a pulp fiber, porous foam, a cotton fiber and a non-woven fabric.

14. A body fluid absorbent article as defined in claim 12, wherein embossing is carried out on said absorbent member made of said absorbent material other than the tow.

15. A body fluid absorbent article as defined in claim 1, wherein said body fluid retainable absorbent member has a compressive resilience RC of 40 to 60%.

16. A body fluid absorbent article as defined in claim 1, wherein the above body fluid retainable absorbent member has a work of compression WC of 4.0 to 10.0 gf·

cm/cm².

17. A body fluid absorbent article as defined in claim 1, wherein said body fluid retainable absorbent member has a tow fiber density of 0.03 to 0.25 g/cm³.

18. A body fluid absorbent article as defined in claim 1, wherein said body fluid retainable absorbent member has a basis weight of 30 to 300 g/m².

19. A body fluid absorbent article as defined in claim 1, wherein said body fluid retainable absorbent member has a mass of 1 to 15 g.

20. A body fluid absorbent article as defined in claim 1, wherein said body fluid permeable absorbent member has a porosity of 60 to 85%.

21. A body fluid absorbent article as defined in claim 1, wherein said body fluid permeable absorbent member is interposed, between said face sheet and a middle portion in the width direction of said body fluid retainable absorbent member, along its longitudinal direction and

pressing is carried out along the longitudinal direction on portions on the both sides of said body fluid permeable absorbent member, the portions where said body fluid permeable absorbent member is not interposed.

22. A body fluid absorbent article as defined in claim 1, wherein said body fluid permeable absorbent member is interposed, between said face sheet and an intermediate portion in the longitudinal direction of said body fluid retainable absorbent member and

pressing is carried out along the width direction of said body fluid retainable absorbent member on portions in front and back of said body fluid permeable absorbent member, the portions where said body fluid permeable absorbent member is not interposed.

23. A body fluid absorbent article as defined in claim 1, wherein a body fluid diffusion sheet is interposed between said body fluid retainable absorbent member and said body fluid permeable absorbent member.

24. A body fluid absorbent article as defined in claim 23, wherein pressing is carried out on said body fluid diffusion sheet along at least the longitudinal direction of said body fluid retainable absorbent member.

25. A body fluid absorbent article as defined in claim 1, wherein a body fluid permeable absorbent sheet is interposed between said face sheet and said absorbent member including said assembly of fibers in tows.

26. A body fluid absorbent article as defined in claim 1, wherein the material fiber of said assembly of fibers in tows is a cellulose acetate fiber.

27. A body fluid absorbent article as defined in claim 1, wherein the material fiber of said assembly of fibers in tows has the cross section of a circle or an ellipse.

28. A body fluid absorbent article as defined in claim 1, wherein pressing is carried out on said body fluid retainable absorbent member so as to extend in at least its longitudinal direction.

29. A body fluid absorbent article as defined in claim 1, wherein said body fluid retainable absorbent member is wrapped with a covering sheet.

30. A body fluid absorbent article as defined in claim 29, wherein said covering sheet is tissue paper.

31. A body fluid absorbent article as defined in claim 29, wherein said covering sheet is a non-woven fabric.

32. A body fluid absorbent article as defined in claim 1, wherein a holding sheet is provided on the back surface side of said body fluid retainable absorbent member.

33. A body fluid absorbent article as defined in claim 32, wherein said holding sheet is a non-woven fabric having a work of compression of 0.01 to 10.00 gf·

cm/cm² and a compressive resilience of 10 to 100% according to KES test.

34. A body fluid absorbent article as defined in claim 1, wherein said body fluid retainable absorbent member has a thickness of 0.1 to 1 cm.