Blade for a refiner for refining lignocellulosic material, and refiner comprising at least one blade

A blade for a refiner for refining lignocellulosic material, the blade being delimited by an inner periphery and an outer periphery and comprising:

• a blade surface with a refiner portion on which a plurality of refiner bars are arranged, wherein:
• each refiner bar extends from an outer bar end to an inner bar end, and
• the plurality of refiner bars are arranged so that a movement along a bar extension from an outer bar end to an inner bar end of a refiner bar is also a movement in a first circumferential direction;
• a dam that extends from an outer dam end to an inner dam end and connects at least three refiner bars that are parallel with each other, and wherein the dam is arranged so that a movement along a dam extension from an outer dam end to an inner dam end is also a movement in the first circumferential direction;
• and
• a groove extending from the outer dam end to the inner dam end and adjacent to the dam on an outer side of the dam, said outer side being a side that faces the outer periphery.