Abstract: Apparatus for refining lignocellulose containing material is disclosed, including a refiner housing including a pair of refiner discs relatively rotatable about a pair of rotatable shafts. Each refiner disc includes a refiner element mounted thereon in a face-to-face relationship defining a refiner gap therebetween. The apparatus includes feed passages passing through the first refiner discs at a location proximate to the rotatable shaft for feeding the lignocellulose-containing material to the refiner gap element and the first refiner disc includes feeding wings corresponding to the feed passages and located partially in front of each such feed passage to accelerate the lignocellulose-containing material into the refiner gap, while the second refiner disc includes a substantially smooth surface portion at a location juxtaposed with the location of the feed passages in the first refiner disc.