Device for hot dispersing fibrous paper stock and a method hot dispersing the stock

• US 6,651,839 B2
• Filed: 01/18/2002
• Issued: 11/25/2003
• Est. Priority Date: 01/19/2001
• Status: Expired due to Fees

• Current Assignee: Voith Paper Patent GmbH
• Original Assignee: Voith Paper Patent GmbH
• Inventors: Schneid, Josef, Niggl, Volker, Schnell, Hans, Kriebel, Almut
• Primary Examiner(s): Noland, Kenneth W.
• Application Number:
  US10/050,138
• Publication Number:
  US 20020112826A1
• Time in Patent Office: 676 Days
• Field of Search: 221/1, 221/135, 221/278, 221/277, 241/15, 241/18, 241/17, 241/23, 241/30
• US Class Current: 221/1
• CPC Class Codes: D21D 1/006 Disc mills
• CPC Class Codes: D21D 1/30 Disc mills

Abstract

A method and a dispersing machine for hot dispersing a highly consistent fibrous stock. The machine includes at least one stationary stator that includes a plurality of annular concentric rows of stator teeth. At least one rotating rotor is provided that includes a plurality of annular concentric rows of rotor teeth. An annular dispersing zone is formed by the stator teeth and the rotor teeth whereby the rotor teeth are adapted to rotate adjacent the stator teeth such that a distance is maintained between the stator teeth and the rotor teeth in the annular dispersion zone. An inlet is provided that allows the fibrous stock to enter the dispersion machine. A milling element is centrally arranged on the rotor. The milling element is arranged near the inlet and defines a milling zone. An annular chamber is arranged between the dispersion zone and the milling zone. At least one conduit allows a heating medium to enter the annular chamber. At least one rotatable annular centrifugal row of teeth is arranged between the milling element and the annular chamber. The method includes transporting the fibrous stock via the inlet to the milling zone, rotating the milling element to subject the fibrous stock to milling, allowing the fibrous stock to pass by the at least one rotatable annular centrifugal row of teeth, subjecting the fibrous stock to the heating medium in the annular chamber, and moving the fibrous stock through the dispersion zone.

Claims

1. A dispersing machine for hot dispersing a highly consistent fibrous stock comprising:

at least one stationary stator that includes a plurality of annular concentric rows of stator teeth;

at least one rotating rotor that includes a plurality of annular concentric rows of rotor teeth;

an annular dispersing zone being formed by the stator teeth and the rotor teeth whereby the rotor teeth are adapted to rotate adjacent the stator teeth such that a distance is maintained between the stator teeth and the rotor teeth in the annular dispersion zone;

an inlet that allows the fibrous stock to enter the dispersion machine;

a milling element centrally arranged on the rotor, the milling element being arranged near the inlet and defining a milling zone;

an annular chamber arranged between the dispersion zone and the milling zone;

at least one conduit allowing a heating medium to enter the annular chamber; and

at least one rotatable annular centrifugal row of teeth arranged between the milling element and the annular chamber.

2. The machine of claim 1, wherein the fibrous stock is a fibrous paper stock.

3. The machine of claim 1, wherein the annular chamber is arranged radially inwards of the dispersion zone.

4. The machine of claim 1, wherein the at least one conduit comprises a plurality of feeding pipes.

5. The machine of claim 4, wherein the plurality of feeding pipes are coupled to the stator.

6. The machine of claim 1, wherein the heating medium comprises a gaseous medium.

7. The machine of claim 6, wherein the gaseous medium comprises steam.

8. The machine of claim 1, wherein the at least one rotatable annular centrifugal row of teeth is adapted to rotate in a direction which is opposite to a direction of rotation of the rotor.

9. The machine of claim 1, wherein the at least one rotatable annular centrifugal row of teeth is adapted to rotate at a different speed than a rotational speed of the rotor.

10. The machine of claim 1, wherein the at least one rotatable annular centrifugal row of teeth is arranged between the milling zone and the annular chamber.

11. The machine of claim 1, wherein the at least one rotatable annular centrifugal row of teeth is arranged between the milling zone and the dispersion zone, the annular chamber being defined by an annular space between the at least one rotatable annular centrifugal row of teeth and the dispersion zone.

12. The machine of claim 1, wherein the at least one rotatable annular centrifugal row of teeth is adapted to rotate in a different direction and at a different speed than a direction and rotational speed of the rotor.

13. The machine of claim 1, wherein the at least one centrifugal row of teeth and the milling element are rotatable in opposite rotational directions.

14. The machine of claim 1, wherein a radially inner end of the dispersion zone is defined by a radially inner row of rotor teeth.

15. The machine of claim 1, wherein the stator has no other rows of teeth other than those of the dispersion zone.

16. The machine of claim 1, wherein the stator has a planar surface that faces the annular chamber.

17. The machine of claim 1, further comprising a rotating feeding screw adapted to deliver the fibrous stock to the inlet.

18. The machine of claim 1, further comprising a carrier coupled to the at least one rotatable annular centrifugal row of teeth.

19. The machine of claim 18, wherein the carrier is rotatably mounted.

20. The machine of claim 19, further comprising a feed screw housing, wherein the carrier is rotatably mounted to the feed screw housing.

21. The machine of claim 20, wherein the carrier is adapted to be driven rotationally.

22. The machine of claim 19, wherein the carrier is rotatably mounted to a non-movable member.

23. The machine of claim 22, wherein the non-movable member comprises a feed screw housing.

24. The machine of claim 19, wherein the carrier is one of rotatable with and connected to a feeding screw.

25. A method of hot dispersing a highly consistent fibrous stock in a machine which comprises at least one stationary stator that includes a plurality of annular concentric rows of stator teeth, at least one rotating rotor that includes a plurality of annular concentric rows of rotor teeth, an annular dispersing zone being formed by the stator teeth and the rotor teeth whereby the rotor teeth are adapted to rotate adjacent the stator teeth such that a distance is maintained between the stator teeth and the rotor teeth in the annular dispersion zone, an inlet that allows the fibrous stock to enter the dispersion machine, a milling element centrally arranged on the rotor, the milling element being arranged near the inlet and defining a milling zone, an annular chamber arranged between the dispersion zone and the milling zone, at least one conduit allowing a heating medium to enter the annular chamber, and at least one rotatable annular centrifugal row of teeth arranged between the milling element and the annular chamber, the method comprising:

transporting the fibrous stock via the inlet to the milling zone;

rotating the milling element to subject the fibrous stock to milling;

allowing the fibrous stock to pass by the at least one rotatable annular centrifugal row of teeth;

subjecting the fibrous stock to the heating medium in the annular chamber; and

moving the fibrous stock through the dispersion zone.

26. The method of claim 25, wherein the fibrous stock is a fibrous paper stock.

27. The method of claim 25, wherein the annular chamber is arranged radially inwards of the dispersion zone.

28. The method of claim 25, wherein the at least one conduit comprises a plurality of feeding pipes.

29. The method of claim 28, wherein the plurality of feeding pipes are coupled to the stator.

30. The method of claim 25, wherein the heating medium comprises a gaseous medium.

31. The method of claim 30, wherein the gaseous medium comprises steam.

32. The method of claim 25, wherein the at least one rotatable annular centrifugal row of teeth is adapted to rotate in a direction which is opposite to a direction of rotation of the rotor.

33. The method of claim 25, wherein the at least one rotatable annular centrifugal row of teeth is adapted to rotate at a different speed than a rotational speed of the rotor.

34. The method of claim 25, wherein at least one rotatable annular centrifugal row of teeth is arranged between the milling zone and the annular chamber.

35. The method of claim 25, wherein the at least one rotatable annular centrifugal row of teeth is arranged between the milling zone and the dispersion zone, the annular chamber being defined by an annular space between the at least one rotatable annular centrifugal row of teeth and the dispersion zone.

36. The method of claim 25, wherein the at least one rotatable annular centrifugal row of teeth is adapted to rotate in a different direction and at a different speed than a direction and rotational speed of the rotor.

37. A dispersing machine for hot dispersing a highly consistent fibrous stock comprising:

at least one stationary stator that includes a plurality of annular concentric rows of stator teeth;

at least one rotating rotor that includes a plurality of annular concentric rows of rotor teeth;

an annular dispersing zone being formed by the stator teeth and the rotor teeth whereby the rotor teeth are adapted to rotate adjacent the stator teeth such that a distance is maintained between the stator teeth and the rotor teeth in the annular dispersion zone;

a feeding screw housing having an inlet that allows the fibrous stock to enter the dispersion machine;

a milling element centrally arranged on the rotor, the milling element being arranged near the inlet;

an annular chamber arranged between the dispersion zone and the milling element;

a plurality of conduits coupled to the stator for allowing a heating medium to enter the annular chamber; and

a rotatable carrier having at least one annular centrifugal row of teeth, whereby the at least one rotatable annular centrifugal row of teeth are arranged between the milling element and the annular chamber,

wherein the rotatable carrier is rotatably mounted to the feeding screw housing.