FIELD: machine building; pulp industry.
SUBSTANCE: present group of inventions relates to conical refiners or disc conical refiners for lignocellulosic materials, which can be used for production of stoneground wood pulp. Refining plate segment comprises a convex conical refining surface facing a concave conical refining surface of an opposing refiner plate. Convex conical fining surface comprises bars and grooves formed between adjacent bars. Angle of each bar increases at least 15 degrees with respect to the reference line that is parallel to the rotational axis of the refiner, wherein this angle is a holdback angle of between 10 to 45 degrees at the periphery of the refining surface. Each bar comprises a leading sidewall with an uneven surface having protrusions extending outwardly from the sidewall towards the side wall on the adjacent bar.
EFFECT: use of refining plates in refiners intended for lignocellulosic materials provides higher efficiency of refiners in production of stoneground wood pulp.
42 cl, 6 dwg
