US 12,454,793 B2
Refiner filling piece having variably coated bars
Jens O. Heymer, Montreal (CA); Ronald J. Defoe, Becket, MA (US); and Robert William Gooding, Montreal (CA)
Assigned to AIKAWA FIBER TECHNOLOGIES INC., Sherbrook (CA)
Appl. No. 18/032,740
Filed by AIKAWA FIBER TECHNOLOGIES INC., Sherbrook (CA)
PCT Filed Aug. 16, 2021, PCT No. PCT/CA2021/051126
§ 371(c)(1), (2) Date Apr. 19, 2023,
PCT Pub. No. WO2022/082295, PCT Pub. Date Apr. 28, 2022.
Claims priority of application No. 10 2020 127 783.0 (DE), filed on Oct. 22, 2020.
Prior Publication US 2023/0407563 A1, Dec. 21, 2023
Int. Cl. D21D 1/30 (2006.01); B02C 7/02 (2006.01); B02C 7/12 (2006.01); D21D 1/22 (2006.01); D21D 5/16 (2006.01)
CPC D21D 1/306 (2013.01) [B02C 7/02 (2013.01); B02C 7/12 (2013.01); D21D 1/22 (2013.01); D21D 1/30 (2013.01); D21D 5/16 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A refiner filling piece for a refiner having a rotor that rotates about an axis of rotation and cooperates with a stator to mechanically treat a pulp containing cellulosic fibers, the refiner filling piece being mountable to the rotor or the stator, the refiner filling piece comprising:
a base;
a plurality of spaced-apart refiner bars, each refiner bar being defined by a bar length and a bar height; and
wherein at least some of the refiner bars have a surface coated with a variable thickness coating, wherein the variable thickness coating begins at a point that is between a midpoint of the bar height and a quarter of the bar height above the base.