Process and device for the dispersion of a fibrous paper material

• US 6,250,573 B1
• Filed: 03/24/1998
• Issued: 06/26/2001
• Est. Priority Date: 03/26/1997
• Status: Expired due to Fees

• Current Assignee: Voith Paper Patent GmbH
• Original Assignee: Voith Sulzer Papiertechnik Patent GmbH
• Inventors: Mannes, Wolfgang, Schneid, Josef, Niggl, Volker, Schnell, Hans, Kriebel, Almut
• Primary Examiner(s): Ostrager, Allen M.
• Assistant Examiner(s): Hong, William
• Application Number:
  US09/046,570
• Time in Patent Office: 1,190 Days
• Field of Search: 241/18, 241/17, 241/30
• US Class Current: 241/17
• 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 for dispersing a fibrous paper web which comprises a substantially consistent fibrous paper material. The process includes loosening and pulverizing a fibrous paper material into a fine, friable fibrous material; guiding the fine, friable fibrous material into a vapor chamber in which at least one of a gaseous and vaporous heating medium mixes, calefies, and disperses the fine, friable fibrous material; and dispersing the fine, friable fibrous material in a disperser zone, the disperser zone and the vapor chamber being located in one device. A 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 process for dispersing a fibrous paper stock which comprises a substantially consistent fibrous paper composition, comprising:

loosening and pulverzing a wet fibrous paper composition into a fine, friable fibrous composition;

introducing the fine, friable fibrous composition into a vapor chamber;

introducing into said vapor chamber, separately from said fibrous composition, at least one of a gaseous and vaporous heating medium which mixes, and raises a temperature of the fine, friable fibrous composition;

dispersing the fine, friable fibrous composition in a disperser zone, the disperser zone and the vapor chamber being located in one device; and

triggering said pulvenzing with a maximum velocity between about 10 m/s and 30 m/s.

2. The process of claim 1, wherein the loosening, pulverizing, calefying, and dispersing occur between a stator and a rotor of a disperser, and wherein the stator and rotor comprise concentric rows of teeth which extend axially therefrom into the vapor chamber between the stator and rotor.

3. The process of claim 1, wherein said loosening and pulverizing comprises loosening and pulverizing the fine, friable fibrous composition to a maximum thickness of about 5 mm.

4. The process of claim 1, wherein said loosening and pulverizing comprises loosening and pulverizing the fine, friable fibrous composition to a maximum length of about 10 mm.

5. The process of claim 1, comprising spinning the fine, friable fibrous composition in the heating medium in a fluidized state at least during a predominant portion of calefaction.

6. The process of claim 1, further comprising keeping said fine friable fibrous composition in the vapor chamber for a mean duration of time between about 0.5 and 3 seconds.

7. The process of claim 1, further comprising supplying the heating medium, which is superheated vapor, to a radially exterior area of the vapor chamber.

8. The process of claim 1, further comprising supplying the heating medium, which is superheated vapors to a radially interior area of the vapor chamber.

9. The process of claim 1, further comprising retarding movement of the fine, friable fibrous material in the vapor chamber.

10. The process of claim 1, comprising throttling radial movement of the fine, friable fibrous composition in the disperser zone.

11. The process of claim 1, further comprising calefying the fibrous paper composition before the pulverizing.

12. The process of claim 1, wherein the pulverizing comprises engaging a material plug, which has left a draining worm, with a pulverizing element.

13. The process of claim 1, wherein the pulverizing comprises engaging fibrous pulp pieces from pre-pulverization of a moist fibrous pulp web, that has run off a sieve press, with a pulverizing element.