Refiner plates with steam channels and method for drawing off return steam from a disc refiner

摘要

A refining plate for grinding lignocellulosic material, said plate comprising: a radially outer peripheral edge (40) and a substrate surface (19); a grinding zone (14) including a plurality of substantially radially disposed ledges (18) and grooves (22) between the ledges (18), the ledges (18) projecting upwardly from the substrate surface (19) and the grooves (22) each having a groove width to have; and a steam channel (34) traversing the strips (18) and grooves (22) of the crusher zone (14), the steam channel (34) having a radially outer end (38) inwardly of the outer peripheral edge (40) of the plate and a width , which is much larger than the groove width.