Refining element

A refining element for use in a refining apparatus for the refining of lignocellulosic fibrous material between a pair of refining members including a first refining member comprising an inner rotary refining member including an inner radial surface and an outwardly facing conical surface angularly disposed with respect to said inner radial surface and a second refining member comprising an outer stationary refining member including an inner radial surface and an inwardly facing conical surface angularly disposed with respect to said inner radial surface mounted in juxtaposition with said first refining member whereby said conical surfaces face either other and define a refining gap therebetween for refining said lignocellulosic fibrous material, said refining element adapted for mounting on said inwardly facing conical surface and including a plurality of bars and intermediate grooves, said plurality of bars extending along said refining gap including a pair of side surfaces and an upper surface, said upper surface forming an acute angle with at least one of said pair of side surfaces.