US 12,281,439 B2
Blade segment for refiner
Marko Loijas, Valkeakoski (FI); and Tomi Iisakkila, Valkeakoski (FI)
Assigned to Valmet Technologies Oy, Espoo (FI)
Appl. No. 18/008,625
Filed by Valmet Technologies Oy, Espoo (FI)
PCT Filed Jun. 3, 2021, PCT No. PCT/FI2021/050413
§ 371(c)(1), (2) Date Dec. 6, 2022,
PCT Pub. No. WO2021/250315, PCT Pub. Date Dec. 16, 2021.
Claims priority of application No. 20205590 (FI), filed on Jun. 8, 2020.
Prior Publication US 2023/0220624 A1, Jul. 13, 2023
Int. Cl. D21D 1/30 (2006.01)
CPC D21D 1/306 (2013.01) 20 Claims
OG exemplary drawing
 
1. A blade segment for a refiner for refining fibrous material, the blade segment comprising:
a blade body having a front surface and a rear surface, defining a blade body thickness therebetween, the blade body bounded by a first end edge, a second end edge, a first side edge, and a second side edge opposite to the first side edge, the first side edge and the second side edge extending between the first end edge and the second end edge, wherein the front surface has blade bars and blade grooves which together form a refining surface of the blade segment;
portions of the blade body forming at least one opening extending through the blade body thickness from the front surface to the rear surface and adjoining at least at one of the first side edge and the second side edge when the segment is mounted within a refiner alongside another segment;
at least one feed groove on the refining surface, the feed groove extending from the at least one opening and crossing the blade bars and the blade grooves for feeding the material to be refined across the refining surface; and
wherein the blade bars of the blade segment are interlaced at the feed groove.