Process and device for the dispersion of a fibrous paper material

• US 6,634,583 B2
• Filed: 05/04/2001
• Issued: 10/21/2003
• Est. Priority Date: 03/26/1997
• Status: Expired due to Fees

• Current Assignee: Voith Paper Patent GmbH
• Original Assignee: Voith Paper Patent GmbH
• Inventors: Mannes, Wolfgang, Kriebel, Almut, Schneid, Josef, Niggl, Volker, Schnell, Hans
• Primary Examiner(s): Hong, William
• Application Number:
  US09/848,351
• Publication Number:
  US 20010015389A1
• Time in Patent Office: 900 Days
• Field of Search: 241/17, 241/18, 241/245, 241/261.1, 241/261.2, 241/261.3, 241/296, 241/297, 241/298
• US Class Current: 241/261.2
• CPC Class Codes: B01F 2025/9121 from the center to the circumference, i.e. centrifugal flow
• CPC Class Codes: B01F 2101/47 Mixing of ingredients for making paper pulp, e.g. wood fibres or wood pulp
• CPC Class Codes: B01F 23/56 by introducing solids in liquids, e.g. dispersing or dissolving
• CPC Class Codes: B01F 23/57 Mixing high-viscosity liquids with solids
• CPC Class Codes: B01F 27/271 with means for moving the materials to be mixed radially between the surfaces of the rotor and the stator
• CPC Class Codes: B01F 27/2711 provided with intermeshing elements
• CPC Class Codes: B01F 27/60 with stirrers rotating about a horizontal or inclined axis
• CPC Class Codes: B01F 33/83612 by crushing or breaking
• CPC Class Codes: B01F 35/71775 using helical screws
• CPC Class Codes: D21B 1/14 Disintegrating in mills
• CPC Class Codes: D21D 1/006 Disc mills
• CPC Class Codes: D21D 1/30 Disc mills

Abstract

Process and device for dispersing a fibrous paper web which comprises a substantially consistent fibrous paper material. The device includes an inlet for fibrous paper material, a stationary stator, and at least one rotatable rotor. The stator and the at least one rotor form a pulverizing zone including a pulverizing element located near the inlet for the fibrous paper material, the pulverizing element including least one of scrapers and knives for pulverizing the fibrous material into a fine, friable material; a vapor chamber forming a ring about the pulverizing zone, the vapor chamber being for calefying the fine, friable material formed by the pulverizing element; and a dispersing zone including at least one row of teeth on the stator and at least one row of teeth on the at least one rotor which can be moved relative to the at least one row of teeth of the stator.

Claims

1. A device for dispersing a highly consistent paper stock, said device comprising:

an inlet for a wet fibrous paper stock;

a stationary stator;

at least one rotatable rotor;

wherein said stator and said at least one rotor are arranged to form;

a pulverizing zone, including a pulverizing element located near said inlet, said pulverizing element comprising at least one of scrapers and knives for pulverizing the fibrous composition into a fine, friable composition;

a dispersing zone, including at least one row of teeth on said stator and at least one row of teeth on said at least one rotor which can be moved relative to said at least one row of teeth of said stator, wherein said at least one row of teeth of said stator and said at least one row of teeth of said at least one rotor forms a gap; and

a vapor chamber, comprising an annular chamber radially oriented between said pulverizing zone and said dispersing zone, wherein said vapor chamber is for calefying the fine, friable composition formed by the pulverizing element;

wherein a heating medium is introduced directly into said vapor chamber to raise the temperature of the friable composition.

2. The device of claim 1, wherein said gap is up to about 3 mm.

3. The device of claim 1, said vapor chamber being delimited downstream by said row of stator teeth which extend to form said gap with said rotor teeth of up to about 3 mm.

4. The device of claim 3, said stator teeth having a distance therebetween of at least 50 mm in a direction of rotation of said rotor.

5. The device of claim 1, said vapor chamber being directly connected to a vapor supply line via a vapor pipe.

6. A device for dispersing a highly consistent paper stock, said device comprising:

an inlet for a wet fibrous paper stock;

a stationary stator;

at least one rotatable rotor;

wherein said stator and said at least one rotor are arranged to form;

a pulverizing zone, including a pulverizing element located near said inlet, said pulverizing element comprising at least one of scrapers and knives for pulverizing the fibrous composition into a fine, friable composition;

a dispersing zone, including at least one row of teeth on said stator and at least one row of teeth on said at least one rotor which can be moved relative to said at least one row of teeth of said stator, wherein said at least one row of teeth of said stator and said at least one row of teeth of said at least one rotor forms a gap; and

a vapor chamber, comprising an annular chamber radially oriented between said pulverizing zone and said dispersing zone, wherein said vapor chamber is for calefying the fine, friable composition formed by the pulverizing element;

wherein a heating medium is introduced directly into said vapor chamber to raise the temperature of the friable composition, and

said disperser zone being closed off radially outside by a throttle, which renders a valve opening area adjustable.

7. The device of claim 6, said throttle comprising a throttle ring equipped with openings, wherein said throttle ring is capable of being turned to adjust said valve opening area.

8. The device of claim 7, said throttle comprising a throttle ring, wherein the throttle ring is capable of being axially displaced to adjust said valve opening area.

9. A device for dispersing a highly consistent fibrous paper stock, said device being contained within a single housing unit and comprising:

an inlet and outlet for a wet fibrous paper stock;

a stationary stator;

at least one rotatable rotor,

wherein said at least one rotatable rotor is arranged to form;

a pulverizing zone, including a pulverizing element located near said inlet, said pulverizing element comprising at least one of scrapers and knives, wherein within the pulverizing zone, the fibrous composition is pulverized into a fine friable composition;

a vapor chamber, comprising an annular chamber radially oriented between the pulverizing zone and a dispersing zone, wherein the fine friable composition is calified by mixing and raising the temperature of the composition via introducing at least one of a gaseous and vaporous heating medium into said vapor chamber,

wherein the heating medium and the fine friable composition are separately introduced into the vapor chamber, and

wherein the heating medium is introduced directly into the vapor chamber, after the pulverizing zone, to raise the temperature of the friable composition; and

a dispersing zone, including at least one row of teeth on said stator and at least one row of teeth on said at least one rotor, which can be moved relative to said at least one row of teeth of said stator, wherein said at least one row of teeth of said stator and said at least one row of teeth of said at least one rotor forms a gap,

wherein the heated and calified fine friable composition is then dispersed into said outlet.

10. The device of claim 9, wherein said gap is up to about 3 mm.

11. The device of claim 9, said vapor chamber being delimited downstream by said row of stator teeth which extend to form said gap with said rotor teeth of up to about 3 mm.

12. The device of claim 11, said stator teeth having a distance therebetween of at least 50 mm in a direction of rotation of said rotor.

13. The device of claim 9, said vapor chamber being directly connected to a vapor supply line via a vapor pipe.

14. A device for dispersing a highly consistent fibrous paper stock, said device being contained within a single housing unit and comprising:

an inlet and outlet for a wet fibrous paper stock;

a stationary stator;

at least one rotatable rotor,

wherein said at least one rotatable rotor is arranged to form;

a pulverizing zone, including a pulverizing element located near said inlet, said pulverizing element comprising at least one of scrapers and knives, wherein within the pulverizing zone, the fibrous composition is pulverized into a fine friable composition;

a vapor chamber, comprising an annular chamber radially oriented between the pulverizing zone and a dispersing zone, wherein the fine friable composition is calified by mixing and raising the temperature of the composition via introducing at least one of a gaseous and vaporous heating medium into said vapor chamber,

wherein the heating medium and the fine friable composition are separately introduced into the vapor chamber, and

wherein the heating medium is introduced directly into the vapor chamber, after the pulverizing zone, to raise the temperature of the friable composition; and

a dispersing zone, including at least one row of teeth on said stator and at least one row of teeth on said at least one rotor, which can be moved relative to said at least one row of teeth of said stator, wherein said at least one row of teeth of said stator and said at least one row of teeth of said at least one rotor forms a gap,

wherein the heated and calified fine friable composition is then dispersed into said outlet, and

the disperser zone being closed off radially outside by a throttle, which renders a valve opening area adjustable.

15. The device of claim 14, said throttle comprising a throttle ring equipped with openings, wherein said throttle ring is capable of being turned to adjust said valve opening area.

16. The device of claim 15, said throttle comprising a throttle ring, wherein said throttle ring is capable of being axially displaced to adjust said valve opening area.

17. A disperser contained within a single housing unit for dispersing a highly consistent fibrous paper stock, said disperser comprising:

an inlet and outlet for a wet fibrous paper stock;

a stationary stator;

at least one rotatable rotor;

wherein said stator and said at least one rotatable rotor are arranged to form;

a pulverizing zone, including a pulverizing element located near said inlet, said pulverizing element comprising at least one of scrapers and knives for pulverizing the fibrous composition into a fine, friable composition;

a vapor chamber, comprising an annular chamber radially oriented between said pulverizing zone and a dispersing zone, wherein a heating medium is introduced directly into said vapor chamber to raise the temperature of the fine friable composition so that the composition is calified; and

a dispersing zone, including at least one row of teeth on said stator and at least one row of teeth on said at least one rotor which can be moved relative to said at least one row of teeth of said stator, wherein said at least one row of teeth of said stator and said at least one row of teeth of said at least one rotor forms a gap, wherein the heated and calified composition is dispersed into said outlet of said disperser.

18. A disperser, contained within a single housing unit, for dispersing a highly consistent fibrous paper stock, comprising:

an inlet for a wet fibrous paper stock;

a stator surrounding the inlet, the stator including at least one row of teeth;

a rotor having at least one row of teeth which cooperates with the at least one row of teeth of said stator, said rotor including a pulverizing element adjacent to said inlet, said pulverizing element comprising at least one of scrapers and knives, creating a pulverizing zone, for pulverizing the fibrous material into a fine friable composition;

a vapor chamber formed as an annular chamber between said rotor and said stator and radially around said pulverizing zone for calefying the fine, friable composition formed by said pulverizing element, wherein a heating medium is introduced directly into the vapor chamber to raise the temperature of the friable composition; and

a dispersing zone.