Claims
- 1. The combination of a pulp press having an inlet end, an outlet end and at least one high pressure nip of at least 300 pli and a belt filter press fabric having a pulp carrying side for supporting and transporting a pump slurry through the high pressure nip, wherein said filter fabric includes a body consisting essentially of:
- a single ply of synthetic monofilament machine direction yarns having selected load bearing and compressive characteristics; and
- means for protecting said machine direction yarns from compressive deterioration as said fabric travels through the high pressure nip of the pulp press including;
- a system of synthetic monofilament cross machine direction yarns at least the majority of which have a compressive characteristic which is greater than the compressive characteristic of said machine direction yarns; and
- said cross machine direction yarns selectively interwoven with said machine direction yarns in a repeat pattern such that the cross machine direction yarns float over at least three adjacent machine direction yarns in each repeat to thereby define a machine contact surface of the fabric such that the cross machine direction floats come in contact with the pulp press as the fabric transports the pulp slurry therethrough.
- 2. The combination of claim 1 wherein said machine direction monofilament yarns have a generally rectangular cross section.
- 3. The combination of claim 1 wherein all of the cross machine direction yarns have a compressive characteristic greater than that of the machine direction yarns.
- 4. The combination of claim 3 wherein all of the cross machine direction yarns have the same compressive characteristic.
- 5. The combination of claim 1 wherein the cross machine direction yarns having a compressive characteristic which is greater than the compressive characteristic of the machine direction yarns comprise at least sixty percent of the cross machine direction yarns.
- 6. The combination of claim 1 wherein the cross machine direction yarns having a compressive characteristic which is greater than the compressive characteristic of the machine direction yarns comprise at least seventy-five percent of the cross machine direction yarns.
- 7. The combination of claim 1 wherein the cross machine direction yarns having a compressive characteristic which is greater than the compressive characteristic of the machine direction yarns are made of a material selected from the group consisting of nylon, polyphthalamide, polyester (PET) alloy sold under the trade name Hoechst Celanese Polymer `D`, an alloy of 90% polyester (PET) and 10% metaxylenediamine, partially aromatic polyamide, and (PBT) polyester.
- 8. The combination of claim 7 wherein the machine direction yarns are comprised of (PET) polyester.
- 9. The combination of claim 7 wherein the machine direction yarns have a rectangular cross section.
- 10. The combination of claim 7 wherein the cross machine direction yarns dominate both surfaces of the fabric.
- 11. A belt filter press fabric for supporting, pressing and draining moisture from a pulp slurry in a pulp press having an inlet end, an outlet end and at least one high pressure nip, said filter fabric having a body consisting essentially of:
- a single ply of synthetic monofilament machine direction yarns having selected load bearing and compressive characteristics, and
- means for protecting said machine direction yarns from compressive deterioration at nip pressures in a pulp press greater than 300 pli including:
- a system of synthetic monofilament cross machine direction yarns at least the majority of which have a compressive characteristic which is greater than the compressive characteristic of said machine direction yarns; and
- said cross machine direction yarns selectively interwoven with said machine direction yarns in a repeat pattern such that the cross machine direction yarns float over at least three adjacent machine direction yarns in each repeat to thereby define a machine contact surface of the fabric.
- 12. The fabric of claim 11 wherein said machine direction monofilament yarns have a generally rectangular cross section which is 0.38 mm by 0.6 mm and the cross machine direction yarns are 0.5 mm in diameter.
- 13. The fabric of claim 11 wherein the cross machine direction yarns weave in two piles, the cross machine direction yarns of each ply woven in floats on a surface of the fabric and the machine direction yarns extend between the two piles of cross machine direction yarns.
- 14. The fabric of claim 11 wherein the machine direction monofilament yarns have a major to minor axis ratio of at least 1.5:1.
- 15. The fabric of claim 11 wherein:
- the cross machine direction yarns having a compressive characteristic which is greater than the compressive characteristic of the machine direction yarns are made of a material selected from the group consisting of nylon, polyphthalamide, polyester (PET) alloy sold under the trade name Hoechst Celanese Polymer, `D`, an alloy of 90% polyester (PET) and 10% metaxylenediamine, partially aromatic polyamide, and (PBT) polyester; and
- wherein the machine direction yarns are made of polyester (PET).
- 16. The combination of a pulp press having an inlet end, an outlet end and at least one high pressure nip of at least 300 pli and a belt filter press fabric having a pulp carrying side for supporting and transporting a pump slurry through the high pressure nip, wherein said filter fabric includes a body consisting essentially of:
- a single ply of synthetic monofilament machine direction yarns having selected load bearing and compressive characteristics; and
- means for protecting said machine direction yarns from compressive deterioration as said fabric travels through the high pressure nip of the pulp press including;
- a system of synthetic monofilament cross machine direction yarns at least the majority of which have a compressive characteristic which is greater than the compressive characteristic of said machine direction yarns;
- said cross machine direction yarns selectively interwoven with said machine direction yarns in a repeat pattern such that said cross machine direction yarns weave in two piles with the machine direction yarns extending between the two piles of cross machine direction yarns; and
- each ply of cross machine direction yarns woven in floats on a surface of the fabric to thereby respectively define a slurry-carrying surface and a machine contact surface of the fabric such that the cross machine direction floats of the machine contact surface come in contact with the pulp press as the fabric transports the pulp slurry therethrough.
- 17. The combination of claim 16 wherein the cross machine direction yarns having a compressive characteristic which is greater than the compressive characteristic of the machine direction yarns are made of a material selected from the group consisting of nylon, polyphthalamide, polyester (PET) alloy sold under the trade name Hoechst Celanese Polymer `D`, an alloy of 90% polyester (PET) and 10% metaxylenediamine, partially aromatic polyamide, and (PBT) polyester.
- 18. The combination of claim 16 wherein said machine direction yarns have a generally rectangular cross section.
- 19. A belt filter press fabric for supporting, pressing and draining moisture from a pulp slurry in a pulp press having an inlet end, an outlet end and at least one high pressure nip, said filter fabric having a body consisting essentially of:
- a single ply of synthetic monofilament machine direction yarns having selected load bearing and compressive characteristics, and
- means for protecting said machine direction yarns from compressive deterioration at nip pressures in a pulp press greater than 300 pli including:
- a system of synthetic monofilament cross machine direction yarns at least the majority of which have a compressive characteristic which is greater than the compressive characteristic of said machine direction yarns;
- said cross machine direction yarns selectively interwoven with said machine direction yarns in a repeat pattern such that the cross machine direction yarns weave in two piles with the machine direction yarns extending between the two piles of cross machine direction yarns; and
- each ply of cross machine direction yarns woven in floats on a surface of the fabric to thereby respectively define a slurry-carrying surface and a machine contact surface of the fabric such that the cross machine direction floats of the machine contact surface come in contact with the pulp press as the fabric transports the pulp slurry therethrough.
- 20. The fabric of claim 19 wherein:
- the cross machine direction yarns having a compressive characteristic which is greater than the compressive characteristic of the machine direction yarns are made of a material selected from the group consisting of nylon, polyphthalamide, polyester (PET) alloy sold under the trade name Hoechst Celanese Polymer `D`, an alloy of 90% polyester (PET) and 10% metaxylenediamine, partially aromatic polyamide, and (PBT) polyester; and
- the machine direction yarns are made of polyester (PET).
- 21. The fabric of claim 20 wherein said machine direction yarns have a generally rectangular cross section.
Parent Case Info
This application is a continuation-in-part of my copending application for Belt Filter Press Fabric, Ser. No. 07/592,306 filed Oct. 3, 1990 which is now U.S. Pat. No. 5,094,719 issued Mar. 10, 1992.
US Referenced Citations (12)
Continuation in Parts (1)
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Number |
Date |
Country |
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592306 |
Oct 1990 |
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