Open discharge pulp refiner

• US 3,910,511 A
• Filed: 05/20/1974
• Issued: 10/07/1975
• Est. Priority Date: 05/20/1974
• Status: Expired due to Term

• Current Assignee: Jorg Rihs, Philip J. Leider
• Original Assignee: Jorg Rihs, Philip J. Leider
• Inventors: Leider, Philip J., Rihs, Jorg
• Primary Examiner(s): Custer, Jr., Granville Y.
• Assistant Examiner(s): Goldberg, Howard N.
• Application Number:
  US05/471,473
• Time in Patent Office: 505 Days
• Field of Search: 241/260,261.2,261.3,296,298
• US Class Current: 241/261.3
• CPC Class Codes: B02C 7/06 with horizontal axis B02C7/04 takes precedence
• CPC Class Codes: B02C 7/12 Shape or construction of discs
• CPC Class Codes: D21D 1/30 Disc mills
• CPC Class Codes: D21D 1/306 Discs

Abstract

Open discharge, low consistency, paper pulp refiners are provided with refining plates having a pumping or positive beater bar angle to the plate radius of from 5* to 25*, feed grooves in the face of at least one of a plate pair being plugged at the outer plate periphery and the width of the beater bar flow channels sufficient to balance centrifugal flow forces on the pulp stock tending to accelerate said stock therethrough.

Claims

1. In an open discharge, low consistency, cellulosic stock refining engine having an unpressurized stock discharge conduit and a cooperative pair of planar, oppositely facing, relatively rotating refining plates, said plates having a circular outer periphery about an axis of rotation and being divided into inner and outer concentric annular sections, said annular sections being separated by a circular distribution groove into the face plane of said plates, said outer annular section being further divided into a plurality of circle sectors, said sectors being separated by stock feed grooves into the face plane of said plates, said stock feed grooves extending linearly from said circular distribution groove to the proximity of said outer periphery, relative to a predetermined rotational direction for said plates, the improvement comprising:

A. a plurality of alternating parallel beater bars and flow channels extending across the face plane of said plates within a sector which is delineated by two angularly successive feed grooves relative to said rotational direction, the feed groove angularly leading said sector relative to said rotational direction being designated as the leading feed groove and the feed groove angularly trailing said sector relative to said rotational direction being designated as the lagging feed groove, said bars and channels within a respective sector being angularly oriented parallel to the length of said lagging feed groove, a number of said channels within a respective sector being continuously open from said circular distribution groove to said outer plate periphery, the remainder of said channels within a respective sector being continuously open from the respective leading feed groove to said outer plate periphery; and

, B. said feed grooves terminating inwardly from said outer periphery thereof respective to at least one plate of a cooperative pair.

2. Apparatus as described by claim 1 wherein the average angle of said bars relative to a plate radius is between 5* and 25*.

3. Apparatus as described by claim 1 wherein said feed grooves are radial.

4. Apparatus as described by claim 1 wherein one plate of said cooperative pair is stationary, said feed grooves in the other, rotating, plate being plugged inwardly from said outer periphery.

5. Apparatus as described by claim 1 wherein the stock flow resistance within said channels is approximately equal to the centrifugal force on said stock within said channels when said plates are relatively rotating.

6. Apparatus as described by claim 5 wherein said bars and channels are approximately of equal width.

7. Apparatus as described by claim 5 wherein said channels are of greater width than said bars.

8. In an open discharge, low consistency, cellulosic stock refining engine having an unpressurized stock discharge conduit and a cooperative pair of planar, oppositely facing, relatively rotating refining plates, said plates having a circular outer periphery about an axis of rotation and being divided into inner and outer concentric annular sections, said annular sections being separated by a circular distribution groove into the face plane of said plates, said outer annular sections being further divided into a pluralitY of circle sectors, each of said sectors having an adjacent stock feed groove into said plate face plane between adjacent sectors, said feed groove extending linearly from said distribution groove to the proximity of said outer periphery, relative to a predetermined rotational direction for said plates, the improvement comprising:

A. each feed groove being disposed at an angle relative to a plate radius passing therethrough whereby the outer peripherial portion of the respective feed groove angularly trails the inner portion thereof relative to said rotational direction;

B. a plurality of alternating beater bars and flow channels across said plate face plane within said sectors angularly preceding an adjacent feed groove relative to said rotational direction and parallel thereto, a number of said channels being continuously open from said distribution groove to said outer periphery, the remainder of said channels opening into the feed groove respective to the next adjacent angularly preceding sector and being continuously open to said outer periphery; and

C. said feed grooves terminating inwardly from said outer periphery thereof respective to at least one plate of a cooperative pair.

9. Apparatus as described by claim 8 wherein the angle of said feed groove relative to a plate radius is less than 15*.

10. Apparatus as described by claim 9 wherein one plate of said cooperative pair is stationary, said feed grooves in the other, rotating plate being plugged inwardly from said outer periphery.

11. Apparatus as described by claim 9 wherein the stock flow resistance within said channels is approximately equal to the centrifugal force on said stock within said channels when said plates are relatively rotating.

12. Apparatus as described by claim 11 wherein said bars and channels are approximately of equal width.