Refiner segment with varying depth profile

Patent metadata

Field	Value
Publication number	US-11866883-B2
Application number	US-201917261627-A
Country	US
Kind code	B2
Filing date	Jun 3, 2019
Priority date	Jul 25, 2018
Publication date	Jan 9, 2024
Grant date	Jan 9, 2024

Abstract

A refiner segment configured to be attached to a refiner disc in a refiner of lignocellulosic material includes: a plurality of bars extending in a direction from an inner periphery of the refiner segment towards an outer periphery of the refiner segment; a plurality of intermediate areas, each intermediate area disposed between adjacent bars of the plurality of bars and configured to separate each bar from an adjacent bar, wherein at least one of the intermediate areas includes: a channel region having a first side and extending a first depth into the refiner segment, and a ridge region connected to the first side of the channel region and extending a second depth into the refiner segment less than the first depth. The channel region has a width W 1 that gradually decreases in a direction from the outer periphery of the refiner segment toward the inner periphery of the refiner segment, and the ridge region has a width W 2 that correspondingly increases in the direction from the outer periphery of the refiner segment toward the inner periphery of the refiner segment.

First claim

The invention claimed is:

1. A refiner segment configured to be attached to a refiner disc in a refiner of lignocellulosic material, the refiner segment comprising:
a plurality of bars extending in a direction from an inner periphery of the refiner segment towards an outer periphery of the refiner segment;
a plurality of intermediate areas, each intermediate area disposed between adjacent bars of the plurality of bars and configured to separate each bar from an adjacent bar, wherein at least one of the intermediate areas comprises:
a channel region having a first side and extending a first depth into the refiner segment, and
a ridge region connected to the first side of the channel region and extending a second depth into the refiner segment less than the first depth, wherein:
the channel region has a width W 1 that gradually decreases in a direction from the outer periphery of the refiner segment toward the inner periphery of the refiner segment, and the ridge region has a width W 2 that correspondingly increases in the direction from the outer periphery of the refiner segment toward the inner periphery of the refiner segment.

2. The refiner segment of claim 1 , wherein:
the channel region includes a second side connected to a first bar of the plurality of bars; and
the ridge region includes a second side connected to a second bar of the plurality of bars adjacent to the first bar such that the second side of the channel region and the second side of the ridge region are disposed on opposite sides of the intermediate area.

3. The refiner segment of claim 2 , wherein the ridge region has a height that increases in a direction extending from the first side of the channel region to the second side of the ridge region.

4. The refiner segment of claim 1 , wherein the channel region comprises a channel having a block-shaped cross-section.

5. The refiner segment of claim 1 , wherein the first depth of the channel region into the refiner segment increases in the direction from the outer periphery of the refiner segment to the inner periphery of the refiner segment.

6. The refiner segment of claim 1 , wherein a height difference between the first depth of the channel region into the refiner segment and the second depth of the ridge region into the refiner segment gradually increases in the direction extending from the outer periphery toward the inner periphery.

7. The refiner segment of claim 1 , wherein the ridge region forms a plateau region.

8. The refiner segment of claim 1 , wherein the plurality of bars includes a number N of spaced apart bars, where N is between 4 and 7.

9. The refiner segment according to claim 1 , wherein the plurality of bars extend around 20-40% of a total radial length of the refiner segment.

10. The refiner segment of claim 9 , further comprising:
an outer region disposed between the plurality of bars and the outer periphery of the refiner segment; and
a plurality of refining structures disposed in the outer region, the plurality of refining structures configured to process wood chips.

11. The refiner segment of claim 1 , wherein the channel region comprises a channel having an at least partially angled cross-section.

12. A refiner segment of claim 1 , wherein the channel region comprises a channel having a chamfered cross-section.

13. A refiner segment of claim 1 , wherein the channel region comprises a channel having a bowl-shaped cross section.

14. A refiner disc provided with a comprising the refiner segment of claim 1 .

15. The refiner disc of claim 14 , wherein the refiner disc is a stator disc or a rotor disc.

16. A refiner comprising the refiner disc of claim 15 .

Assignees

• Valmet Oy

Inventors

• Lindblom Thommy

Classifications

• D21D1/306 Primary

  Discs · CPC title

• B02C7/12

  Shape or construction of discs · CPC title

• D21D1/303

  Double disc mills · CPC title

• D21D1/30

  Disc mills · CPC title

• D21B1/14

  Disintegrating in mills · CPC title