Weft knit wicking fabric and method of making same

• US 5,735,145 A
• Filed: 05/20/1996
• Issued: 04/07/1998
• Est. Priority Date: 05/20/1996
• Status: Expired due to Term

• Current Assignee: Monarch Knitting Machinery Corporation
• Original Assignee: Monarch Knitting Machinery Corporation
• Inventors: Pernick, Bruce M.
• Primary Examiner(s): CALVERT, JOHN JAMES
• Application Number:
  US08/650,609
• Time in Patent Office: 687 Days
• Field of Search: 66/193, 66/195, 66/197, 66/202, 604/378
• US Class Current: 66/196
• CPC Class Codes: A61F 13/53 characterised by the absorbing medium A61F13/20 takes 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: D04B 1/16 synthetic threads
• CPC Class Codes: D10B 2201/02 Cotton
• CPC Class Codes: D10B 2331/04 polyesters, e.g. polyethylene terephthalate [PET]
• CPC Class Codes: D10B 2401/021 hydrophobic
• CPC Class Codes: D10B 2401/022 hydrophylic
• CPC Class Codes: D10B 2403/0112 One smooth surface, e.g. laminated or coated
• CPC Class Codes: D10B 2403/0114 with one or more yarns appearing predominantly on one face, e.g. plated or paralleled yarns for pile fabrics D03D27/00, D04B1/02, D04B21/02; for intarsia fabrics D04B1/126
• CPC Class Codes: D10B 2403/021 Lofty fabric with equidistantly spaced front and back plies, e.g. spacer fabrics
• CPC Class Codes: D10B 2503/062 Fitted bedsheets

Abstract

A multi-layer weft knit fabric for absorbing moisture and wicking it from a first fabric layer to a second layer is described, as well as a method for making the fabric. The multi-layer fabric includes a first hydrophobic layer and a second hydrophilic layer, with the layers being secured together by a series of courses forming spacer yarns which maintain the fabric layers in a spaced relationship relative to each other. The spacer yarns are adapted to wick moisture from the hydrophobic layer to the hydrophilic layer. The spacer yarns are preferably knit-in or laid-in to the respective knit fabric layers, and a plastic water-resistant layer can be secured proximate the hydrophilic fabric layer. A method of integrally knitting the multi-layer fabric on a circular knitting machine is also described.

Claims

1. A method of making a weft knit, wicking fabric on a dual bed knitting machine comprising the steps of:

knitting a first discrete fabric layer from a hydrophobic yarn on a first needle bed of the weft knitting machine,

knitting a second discrete fabric layer from a hydrophilic yarn on a second needle bed of the weft knitting machine, and

knitting a series of courses reciprocating between the first and second needle beds to form a plurality of spacer yarns the spacer yarns securing the first and second fabric layers together in a spaced relationship separated from each other, said series of courses being knit from a moisture transporting yarn for wicking moisture from the first fabric layer to the second fabric layer.

2. The method according to claim 1, wherein said step of knitting a series of courses reciprocating between the first and second needle beds to form a plurality of spacer yarns securing the first and second fabric layers together in a spaced relationship to each other is performed such that the first and second fabric layers are substantially consistently spaced from each other across their respective widths.

3. The method according to claim 1, wherein said step of knitting a series of courses reciprocating between the first and second needle beds to form a plurality of spacer yarns securing the first and second fabric layers together in a spaced relationship to each other is performed such that each course of said series of courses forming the plurality of spacer yarns reciprocates directly from one needle bed to the other needle bed so that the spacer yarns extend substantially vertically between the first and second fabric layers.

4. The method according to claim 1, wherein said step of knitting first and second fabric layers and said series of courses reciprocating between the first and second needle beds further comprising knitting said second discrete fabric layer on a dial needle bed of a circular knitting machine having cylinder and dial needle beds.

5. The method according to claim 1, wherein said step of knitting a series of courses reciprocating between the first and second needle beds comprises laying the yarn into the first fabric layer.

6. The method according to claim 5, wherein said step of knitting a series of courses reciprocating between the first and second needle beds comprises laying the yarn into the second fabric layer.

7. The method according to claim 5, wherein said step of knitting a series of courses reciprocating between the first and second needle beds comprises knitting the yarn into the second fabric layer.

8. The method according to claim 1, further comprising the step of coating a surface of the hydrophilic layer remote from the hydrophobic layer with a layer of substantially continuous plastic, to thereby provide a moisture resistant surface on the fabric.

9. A multi-layer weft knit fabric for wicking moisture away from a first surface comprising:

a first substantially hydrophobic weft knit discrete fabric layer,

a second substantially hydrophilic weft knit discrete fabric layer, and

a plurality of moisture transporting spacer yarns secured within the knit structure of each of said first and second layers and extending between the layers to secure the layers in spaced relationship separated from each other, said spacer yarns promoting wicking of moisture from said first knit substantially hydrophobic fabric layer to said second substantially hydrophilic layer.

10. The fabric according to claim 9, further comprising a moisture-resistant layer secured adjacent said hydrophilic layer.

11. The fabric according to claim 10, wherein said moisture-resistant layer comprises a plastic coating on a surface of said hydrophilic layer remote from said hydrophobic layer.

12. The fabric according to claim 11, wherein said plastic coating comprises vinyl.

13. The fabric according to claim 9, wherein spacer yarns are laid into knit stitches forming said hydrophobic layer.

14. The fabric according to claim 13, wherein spacer yarns are laid into knit stitches forming said hydrophilic layer.

15. The fabric according to claim 14, wherein spacer yarns are knit into knit stitches forming said hydrophilic layer.

16. The fabric according to claim 9, wherein said hydrophobic layer comprises a polyester yarn.

17. The fabric according to claim 16, wherein said hydrophobic layer comprises a polyester monofilament yarn about 70 denier in size or smaller.

18. The fabric according to claim 16, wherein said hydrophobic layer comprises a multifilament polyester yarn about 50-300 denier in size.

19. The fabric according to claim 16, wherein said hydrophobic layer comprises a spun 18s-36s polyester yarn.

20. The fabric according to claim 9, wherein said spacer yarns comprise non-textured synthetic yarns.

21. The fabric according to claim 9, wherein said hydrophilic layer comprises a yarn selected from the group consisting of cotton, rayon, and blends thereof.

22. The fabric according to claim 9, wherein said spacer yarns are knit into knit stitches forming said hydrophilic layer, and further comprising a moisture-resistant coating on a surface of said hydrophilic layer remote from said hydrophobic layer.

23. A multi-layer, weft knit fabric comprising:

a first discrete layer knit from a hydrophobic yarn,

a second discrete layer knit from a hydrophilic yarn,

a plurality of moisture transporting spacer yarns extending substantially between the first and second layers to hold them in a spaced relationship to each other and for wicking moisture from the first layer to the second layer, and

a moisture-resistant layer secured adjacent the second layer, to block the transfer of moisture from the second layer.

24. The fabric according to claim 23, wherein said first layer comprises a spun polyester yarn.

25. The fabric according to claim 24, wherein said spacer yarns comprise non-textured polyester yarns.

26. The fabric according to claim 23, wherein said first layer comprises a spun polyester yarn, said second layer comprises a natural fiber yarn, and said spacer yarns comprise a non-textured polyester yarn.

27. The fabric according to claim 23, wherein said spacer yarns are laid into said first fabric layer and knit into said second fabric layer in a plated relationship with the hydrophilic yarn, and

said moisture-resistant layer comprises a plastic coating secured to a surface of said second fabric layer remote from said first fabric layer.

28. An item of bedclothing for incontinent use comprising:

an upper substantially hydrophobic weft knit discrete fabric layer,

a lower substantially hydrophilic weft knit discrete fabric layer, and

a plurality of moisture transporting spacer yarns secured within the knit structure of each of the upper and lower layers and extending between the layers to secure them in spaced relationship separated from each other, said spacer yarns for wicking moisture from the upper substantially hydrophobic fabric layer to the lower substantially hydrophilic layer.

29. The bedclothing according to claim 28, further comprising a moisture-resistant layer secured adjacent said hydrophilic layer.

30. The bedclothing according to claim 28, wherein said moisture-resistant layer comprises a plastic coating on a surface of said hydrophilic layer remote from said hydrophobic layer.

31. The bedclothing according to claim 30, wherein spacer yarns are laid into knit stitches forming said hydrophobic layer, and knit into knit stitches forming said hydrophilic layer.