Claims
- 1. An apparatus for treating medium to high consistency pulp having a consistency of from 8 to 20% in a washer or some other medium to high consistency pulp treatment device such that no contact between air and the pulp is allowed during treatment, said apparatus comprising:
- an outer housing which surrounds a rotating liquid pervious cylinder, said outer housing and said rotating cylinder defining therebetween a treatment space for the pulp, said treatment space being divided into a number of treatment compartments by means of substantially radial partition walls extending from said rotating cylinder towards said outer housing, said treatment compartments each having a bottom formed by said rotating liquid pervious cylinder, said filter cylinder having a number of circumferentially positioned compartments thereinside so as to receive filtered liquid from the pulp in the treatment space;
- feed means for feeding said medium to high consistency pulp to said treatment compartments; and
- discharge means for removing pulp from said device, said feed and discharge means occupying at most 60.degree. of the entire circumference of the rotating cylinder, said feed means including a small, substantially air-tight pressure chamber and a feed duct for supplying said medium to high consistency pulp to said pressure chamber, said pressure chamber having a bottom and a side wall, said bottom being formed by the bottom of said treatment compartment, said pressure chamber being attached by its side wall to said outer housing in an air-tight manner so as to ensure that no air contacts the pulp during treatment.
- 2. An apparatus as recited in claim 1, wherein said filtering means includes liquid pervious wires of a belt type pulp treatment device.
- 3. An apparatus as recited in claim 1, and further comprising an outer housing which surrounds a stationary liquid pervious cylindrical surface having a rotating liquid pervious cylinder therewithin, said liquid pervious cylindrical surface and said rotating cylinder defining therebetween the treatment space for pulp, said outer housing and said stationary cylindrical surface forming an outer and an inner wall of annularly arranged chambers for receiving filtered liquid from the pulp in said treatment space, said treatment space being divided into a number of treatment compartments by means of substantially radial partition walls extending from said rotating cylinder towards said stationary cylindrical surface, said pressure chamber having a bottom wall and a side wall, said chamber being attached by means of its side wall to said outer housing in an air-tight manner so that said rotating cylinder forms said bottom wall of said pressure chamber.
- 4. An apparatus as recited in claim 1, and further comprising an outer housing which surrounds a stationary liquid pervious cylindrical surface having a rotating liquid pervious cylinder therewithin, said liquid pervious cylindrical surface and said rotating cylinder defining therebetween the treatment space for pulp, said outer housing and said stationary cylindrical surface forming an outer and an inner wall of annularly arranged chambers for feeding treating liquid to the pulp in said treatment space, said treatment space being divided into a number of treatment compartments by means of substantially radial partition walls extending from said rotating cylinder towards said stationary cylindrical surface, said pressure chamber having a bottom wall and a side wall, said chamber being attached by means of its side wall to said outer housing in an air-tight manner so that said rotating cylinder forms said bottom wall of said pressure chamber.
- 5. An apparatus as recited in claim 1, wherein said housing is pressure proof.
- 6. An apparatus as recited in claim 1, wherein said pressure chamber extends over the entire width of said apparatus.
- 7. An apparatus as recited in claim 1, wherein said pressure chamber is divided axially into a number of separate pressure chambers.
- 8. An apparatus as recited in claim 2, and further comprising a feed end, a discharge end, said wires including a first wire arranged to travel over a first set of rolls, and a second wire arranged to travel over a second set of rolls, said wires forming a treatment space therebetween which tapers towards said discharge end and forms a wedge shaped gap therebetween at said feed end, said wires having seals at the sides thereof so as to prevent the pulp from leaking from the sides of said wires, said pressure chamber having a bottom wall and a side wall, said bottom wall being formed partially of said wires and partially of said wedge shaped gap between said wires at said feed end.
- 9. An apparatus as recited in claim 8, wherein said seals of said treatment space extend so as to form opposite ends of said pressure chamber, so that both said pressure chamber and said treatment space are pressure proof.
- 10. An apparatus as recited in claim 1, and further comprising a pressure balancing chamber in connection with said pressure chamber so as to balance pressure fluctuations in the pulp.
- 11. An apparatus as recited in claim 1, and further comprising a pressure balancing chamber in connection with said feed duct so as to balance pressure fluctuations in the pulp.
- 12. An apparatus for treating medium to high consistency pulp having a consistency of from 8 to 20% in a washer or some other medium to high consistency pulp treatment device so that no contact between air and the pulp is allowed during treatment, said apparatus comprising:
- an outer housing which surrounds a rotating liquid pervious cylinder, said outer housing and said rotating cylinder defining therebetween a treatment space for the pulp, said treatment space being divided into a number of treatment compartments by means of substantially radial partition walls extending from said rotating cylinder towards said outer housing, said treatment compartments each having a bottom formed by said rotating liquid pervious cylinder, said filter cylinder having a number of circumferentially positioned compartments thereinside so as to receive filtered liquid from the pulp in the treatment space;
- feed means for feeding said medium to high consistency pulp to said treatment compartment; and
- discharge means for removing pulp from said device, said feed and discharge means occupying at most 60.degree. of the entire circumference of the rotating cylinder, said feed means including a small, substantially air-type pressure chamber and a feed duct for supplying said medium to high consistency pulp to said pressure chamber, said pressure chamber having a bottom and side wall, said bottom being formed by the bottom of said treatment compartment, said side wall having a first portion and a second portion, said first portion being formed by said radial partition wall of said rotating cylinder, said pressure chamber being attached by its second side wall portion to said outer housing in an air-tight manner so as to insure that no air contacts the pulp during treatment.
Priority Claims (1)
Number |
Date |
Country |
Kind |
874967 |
Nov 1987 |
FIX |
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Parent Case Info
This is a continuation-in-part application of application Ser. No. 07/224,467, filed Jul. 26, 1988, U.S. Pat. No. 4,952,314.
US Referenced Citations (6)
Continuation in Parts (1)
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Number |
Date |
Country |
Parent |
224467 |
Jul 1988 |
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