Claims
- 1. A woven papermakers fabric of the type having a paper side which is in contact with a paper sheet and a machine side which is in contact with machine rollers, the woven fabric being comprised of:
- a first system of longitudinal, monofilament machine direction yarns that dominate the paper side of the fabric;
- an intermediate system of longitudinal, monofilament machine direction yarns that do not appear on either the paper side or the machine side of the fabric;
- a second system of longitudinal, monofilament machine direction yarns that dominate the machine side of the fabric; and
- a multilayer system of cross machine direction yarns, the yarns of the first, intermediate and second systems are arranged in vertically stacked groups of first, intermediate and second machine direction yarns positioned one above the other in a superimposed relationship and are interwoven with the yarns of the cross machine direction system in a repeated pattern that maintains the stacked relationship of the yarns such that the yarns of the first system do not pass to the machine side of the fabric, the yarns of the second system do not pass to the paper side of the fabric and the yarns of the intermediate system do not pass to either the paper or the machine side of the fabric and the intermediate yarns are interlaced with the cross machine direction yarns of at least two layers of said multilayer system.
- 2. A papermakers fabric according to claim 1 wherein at least said first and second systems of machine direction yarns are flat monofilament yarns.
- 3. A papermakers fabric according to claim 2 wherein said flat monofilament yarns have an aspect ratio of at least 3:1.
- 4. A papermakers fabric comprising:
- a system of CMD yarns including at least upper and lower layers of CMD yarns;
- a system of flat monofilament MD yarns interwoven with said CMD yarns in a selected repeat pattern;
- said MD yarns system having paired upper and lower yarns that are stacked in the same relative vertical alignment to each other throughout the body of the fabric; and
- said MD yarn system including at least one subsystem of intermediate MD yarns disposed between said upper and lower MD yarns such that at least one intermediate MD yarn is in vertical stacked alignment with each stacked pair of upper and lower MD yarns.
- 5. A papermakers fabric according to claim 4 wherein said upper MD yarns are interwoven with floats over a selected number of said upper layer CMD yarns to define an upper surface of the fabric which is predominated by said upper MD yarn floats.
- 6. A papermakers fabric according to claim 5 wherein said lower MD yarns are interwoven with said lower layer CMD yarns in an inverted image of the repeat of the respective upper MD yarns of said MD yarn pairs whereby a bottom surface of the fabric is defined which is predominated by floats of said lower MD yarns.
- 7. A papermakers fabric according to claim 6 wherein said middle layer MD yarns interweave with both said upper and lower layer CMD yarns.
- 8. A papermakers fabric according to claim 4 wherein at least said upper MD yarns have an aspect ratio of at least 3:1.
- 9. A papermakers fabric according to claim 4 wherein said upper MD yarns are woven 100% warp fill.
- 10. A papermakers fabric according to claim 4 wherein all of said MD yarns have an aspect ratio of at least 3:1 and total at least 300% warp fill.
- 11. A papermakers fabric according to claim 4 wherein:
- said upper MD yarns are woven with said upper layer CMD yarns and repeat with respect to four of said upper layer CMD yarns with a float of three yarns, and
- said lower MD yarns are woven with said lower layer CMD yarns and repeat with respect to four of said lower layer CMD yarns with a float of three yarns.
- 12. A papermakers fabric according to claim 11 wherein said MD yarns are interwoven with said CMD yarns in a balanced weave pattern such that said MD yarn system consists of two types of MD yarn triplets which are offset by two pairs of said upper and lower CMD yarns such that alternate upper and lower yarn pairs are not woven in knuckles by said upper and lower MD yarns.
- 13. A papermakers fabric according to claim 12 wherein the CMD yarns of said alternate CMD yarn pairs which are not woven in knuckles by said upper and lower MD yarns are larger in cross-sectional dimension than the CMD yarns which are woven in knuckles by said upper and lower MD yarns.
- 14. The fabric of claim 13 wherein:
- the upper and lower MD yarns are 0.20 mm by 1.10 mm in cross-sectional dimensions, woven with surface floats and woven 22 MD yarn ends per inch,
- said intermediate yarns are 0.20 mm to 1.10 mm in cross-sectional dimensions, woven 22 MD yarn ends per inch, and
- the upper and lower CMD yarns are round, alternate between 0.70 mm and 0.50 mm in diameter and are woven 21 pairs of CMD yarns per inch such that the fabric has a permeability of 110 cfm.
- 15. A papermakers fabric having a multilayer system of CMD yarns and a system of flat monofilament MD yarns interwoven with said CMD yarns in a selected repeat pattern, wherein the MD yarn system is comprised of a paired upper and lower yarns stacked in the same relative vertical wherein said MD yarn system includes at least one intermediate subsystem of MD yarns disposed between said upper and lower MD yarns which interweaves with at least two layers of CMD yarns, and wherein the upper MD yarns and the lower MD yarns impart different surface characteristics to the opposing sides of the fabric by dominating both of the opposing sides.
- 16. The fabric of claim 15 wherein the at least some of the upper MD yarns are made of a first type of material and at least some of the lower MD yarns are made of a second different type of material.
- 17. A papermakers fabric according to claim 15 wherein at least said upper and lower machine direction yarns are flat monofilament yarns.
- 18. A papermakers fabric according to claim 17 wherein said flat monofilament yarns have an aspect ratio of at least 3:1.
- 19. An industrial fabric comprising:
- a system of CMD yarns;
- a system of flat monofilament MD yarns interwoven with said CMD yarns in a selected repeat pattern;
- said MD yarns system having paired upper and lower yarns that are stacked in the same relative vertical alignment to each other throughout the body of the fabric; and
- said MD yarn system including at least one intermediate MD yarn disposed between said upper and lower MD yarns of each said MD yarn pairs which interweaves with at least two layers of CMD yarns.
- 20. A woven papermakers fabric of the type having a paper side which is in contact with a paper sheet and a machine side which is in contact with machine rollers, the woven fabric being comprised of:
- a first system of longitudinal, monofilament flat machine direction yarns that dominate the paper side of the fabric;
- a second system of longitudinal, monofilament flat machine direction yarns that dominate the machine side of the fabric;
- an intermediate system of longitudinal, monofilament flat machine direction yarns;
- a system of round cross machine direction yarns;
- said system of round cross machine direction yarns including multiple layers; and
- yarns of the first, intermediate and second systems arranged in vertically stacked groups of first, intermediate and second machine direction yarns positioned one above the other in a superimposed relationship and being interwoven with the yarns of the cross machine direction system in a repeated pattern such that the intermediate yarns are interlaced with cross machine direction yarns of at least of two of said multilayers of cross machine direction yarns and do not appear on either the paper side or the machine side of the fabric.
Parent Case Info
This application is a continuation-in-part of copending application Ser. No. 07/829,985 U.S. Pat. No. 5,230,371, filed Feb. 3, 1992, entitled PAPERMAKERS FABRIC HAVING DIVERSE FLAT MACHINE DIRECTION YARN SURFACES, which in turn was a continuation-in-part of application Ser. No. 07/534,164, filed Jun. 6, 1990, entitled PAPERMAKERS FABRIC WITH STACKED MACHINE DIRECTION YARNS U.S. Pat. No. 5,103,874; Ser. No. 07/654,008, filed Feb. 14, 1991, entitled PAPER MAKERS FABRIC WITH FLAT HIGH ASPECT RATIO YARNS U.S. Pat. No. 5,117,865; and Ser. No. 07/567,974, filed Aug. 15, 1990, entitled PAPERMAKERS FABRIC WITH ORTHOGONAL MACHINE DIRECTION YARN SEAMING LOOPS U.S. Pat. No. 5,092,373.
US Referenced Citations (43)
Foreign Referenced Citations (4)
Number |
Date |
Country |
2407291 |
May 1979 |
EPX |
0144592 |
Jun 1985 |
EPX |
0211426 |
Feb 1987 |
EPX |
3225599 |
Jan 1984 |
DEX |
Continuation in Parts (2)
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Number |
Date |
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Parent |
829985 |
Feb 1992 |
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Parent |
534164 |
Jun 1990 |
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