Refiner segment

A refiner segment (101;

• 201) for use in a refiner disc (30;
• 30*) of a refiner (100) for refining of lignocellulosic material, the refiner segment (1) having an active surface (2) which is delimited by an inner periphery (18a), an outer periphery (18b), a first side edge (19a) and a second side edge (19b) of the refining segment (1), wherein the refiner segment comprises, at the active surface (2):
• a plurality of bars (10) that extends over the active surface (2) towards the outer periphery (18b) of the refiner segment, wherein the plurality of bars define a plurality of grooves (19), wherein each of the grooves (19) is defined by two adjacent bars (10);
• and
• a plurality of dams (11), wherein each of the dams (11) extends between two adjacent bars (10), wherein:
• at least some of the grooves (19) comprise a plurality of the dams (11) separated from one another along an extension of the groove (19),
• at least some of the grooves (19) comprise one or more boxes (23), wherein each box (23) is delimited by two adjacent bars (10) and two adjacent dams (11) provided in the same groove (19), wherein a last box (23a) and a last dam (11a) are defined as a box (23) and a dam (11) that are positioned closest to the outer periphery (18b) of the refiner segment in comparison with any other boxes (23) and dams (11) provided in the same groove (19),
• each of at least three adjacent ones of the bars (10) comprises a last-box fluid connection (21), which is a fluid connection provided through the bar (10) that connects a last box (23a) on one side of this bar with a last box (23a) on the other side of this bar (10) such that a pressure can be equalized between these two last boxes (23a) via the last-box fluid connection (21), wherein the last-box fluid connection (21) is provided in the bar (10) at a distance between 0.0-15.0 mm from the closest last dam (11a) that extends from this bar (10) to another adjacent bar (10).