Double disc pulp refiner comprising a center plate

摘要

A center plate (20) is arrangeable on a first refining disc (11) in a double disc pulp refiner (10), where the first refining disc (11) is arranged at an end of the refiner (10) where lignocellulosic material (M) is fed into the refiner (10) through inlet openings (16) in the first refining disc (11) and is provided with at least one refining segment (13) for refining the lignocellulosic material (M). The center plate (20) has a cross-sectional profile adapted such that when the center plate (20) is arranged on the first refining disc (11) in the refiner (10), the center plate (20) protrudes to a maximum height which is the same as, or higher than, the maximum height of the at least one refining segment (13) provided on the first refining disc (11).