Unitary distribution layer

• US 20020123728A1
• Filed: 12/07/2001
• Published: 09/05/2002
• Est. Priority Date: 12/07/2000
• Status: Abandoned Application

• Current Assignee: Weyerhaeuser Company (Weyerhauser)
• Original Assignee: Weyerhaeuser Company (Weyerhauser)
• Inventors: Grant, Terry M., Marsh, David G., Graef, Peter A., Bunker, Daniel T., Johnson, Melissa D.
• Application Number:
  US10/021,668
• Publication Number:
  US 20020123728A1
• Time in Patent Office: Days
• US Class Current: 604/375
• CPC Class Codes: A61F 13/5376 characterised by the performance of the layer, e.g. acquisition rate, distribution time, transfer time
• CPC Class Codes: D21H 11/16 modified by a particular after-treatment
• CPC Class Codes: Y10T 442/659 Including an additional nonwoven fabric
• CPC Class Codes: Y10T 442/668 Separate nonwoven fabric layers comprise chemically different strand or fiber material
• CPC Class Codes: Y10T 442/695 Including a wood containing layer
• CPC Class Codes: Y10T 442/696 Including strand or fiber material which is stated to have specific attributes [e.g., heat or fire resistance, chemical or solvent resistance, high absorption for aqueous compositions, water solubility, heat shrinkability, etc.]
• CPC Class Codes: Y10T 442/697 Containing at least two chemically different strand or fiber materials

Abstract

A fibrous layer that includes a refined blend of crosslinked cellulosic fibers and noncrosslinked cellulosic fibers. In one embodiment, the layer includes about 85 percent by weight crosslinked fibers and about 15 percent by weight noncrosslinked fibers. An absorbent construct that includes the fibrous layer and a liquid storage layer. Personal care absorbent products that include the distribution layer.

Claims

1. A fibrous layer, comprising a refined blend of crosslinked cellulosic fibers and noncrosslinked cellulosic fibers.

2. The layer of claim 1, wherein the crosslinked cellulosic fibers are present in an amount from about 50 to about 90 percent by weight based on the total weight of the layer.

3. The layer of claim 1, wherein the crosslinked cellulosic fibers are present in an amount from about 75 to about 90 percent by weight based on the total weight of the layer.

4. The layer of claim 1, wherein the crosslinked cellulosic fibers are present in about 85 percent by weight based on the total weight of the layer.

5. The layer of claim 1, wherein the noncrosslinked cellulosic fibers are present in an amount from about 10 to about 50 percent by weight based on the total weight of the layer.

6. The layer of claim 1, wherein the noncrosslinked cellulosic fibers are present in an amount from about 10 to about 25 percent by weight based on the total weight of the layer.

7. The layer of claim 1, wherein the noncrosslinked cellulosic fibers are present in about 15 percent by weight based on the total weight of the layer.

8. The layer of claim 1, wherein the noncrosslinked cellulosic fibers comprise southern pine fibers.

9. The layer of claim 1, wherein the noncrosslinked cellulosic fibers comprise hardwood fibers.

10. The layer of claim 1, wherein the noncrosslinked cellulosic fibers comprise eucalyptus fibers.

11. The layer of claim 4, comprising from about 5 to about 15 percent by weight refined southern pine fibers.

12. The layer of claim 4, comprising up to about 10 percent by weight southern pine fibers.

13. The layer of claim 11, wherein the refined southern pine fibers have a Canadian Standard Freeness of about 500.

14. The layer of claim 4, comprising from about 3 to about 5 percent by weight hardwood fibers.

15. The layer of claim 4, comprising from about 10 to about 12 percent by weight southern pine fibers.

16. The layer of claim 1 further comprising a wet strength agent.

17. The layer of claim 1 having an extracts'"'"' surface tension greater than about 50 dynes/cm.

18. The layer of claim 1 having a softness less than about 1200 g.

19. The layer of claim 1 having a mid-point desorption pressure greater than about 20 cm.

20. The layer of claim 1 having a mid-point acquisition pressure less than about 25 cm.

21. The layer of claim 1 having a mid-point uptake greater than about 5 g/g.

22. The layer of claim 1 having a tensile strength greater than about 10 N/50 mm.

23. The layer of claim 1 having a machine direction tear strength greater than about 205 mN.

24. The layer of claim 1 having a cross-machine direction tear strength greater than about 260 mN.

26. The construct of claim 25, wherein the crosslinked fibers are present in an amount from about 50 to about 90 percent by weight based on the total weight of the layer.

27. The construct of claim 25, wherein the crosslinked fibers are present in about 85 percent by weight.

28. The construct of claim 25, wherein the noncrosslinked fibers are present in about 10 to about 50 percent by weight based on the total weight of the layer.

29. The construct of claim 25, wherein the noncrosslinked fibers are present in about 15 percent by weight.

30. The construct of claim 25, wherein the storage layer comprises superabsorbent material.

37. An absorbent article, comprising any one of the layers of claim 1 or 31.

38. An absorbent article, comprising any one of the constructs of claim 25 or 34.

25. An absorbent construct, comprising a liquid distribution layer and a liquid storage layer, wherein the distribution layer comprises a refined blend of crosslinked cellulosic fibers and noncrosslinked cellulosic fibers.

31. A fibrous layer having a mid-point desorption pressure greater than about 20 cm.

32. The layer of claim 31 having a mid-point desorption pressure greater than about 30 cm.

33. The layer of claim 31 having a mid-point desorption pressure greater than about 40 cm.

35. The construct of claim 34 having a mid-point desorption pressure greater than about 30 cm.

36. The layer of claim 34 having a mid-point desorption pressure greater than about 40 cm.

39. The absorbent article of claim 37, wherein the article is at least one of an infant diaper, a training pant, and an adult incontinence product.

40. The absorbent article of claim 38, wherein the article is at least one of an infant diaper, a training pant, and an adult incontinence product.

34. An absorbent construct, comprising a liquid distribution layer and a liquid storage layer, wherein the distribution layer has a mid-point desorption pressure greater than about 20 cm.