Refiner segment in a fiber refiner

A refiner segment for a disc refiner for refining fibrous material configured to form a part of a refining surface of a disc refiner element and travel in a first circumferential direction when arranged on the refiner element, the refiner segment comprising:

• a refining surface;
• a radially inner edge;
• a radially outer edge;
• a pattern of bars and intermediate grooves configured to extend along the refiner segment in a substantially radial direction with respect to the radially inner edge;
• dams configured to extend between the bars and protrude above a surface of the intermediate grooves;
• and
• a plurality of steam channels formed through the bars and configured to allow steam flowing towards the radially inner edge to pass through the plurality of steam channels in a direction having a component directed opposite to the first circumferential direction,
• wherein each steam channel of the plurality of steam channels is disposed adjacent to an intersection between a bar and a dam, radially outside of a respective dam with respect to the radially inner edge, and at a trailing end of the respective dam with respect to the first circumferential direction,
• wherein each steam channel of the plurality of steam channels includes:
• an inlet opening located at a leading end of the steam channel, and
• an outlet opening located at a trailing end of the steam channel with respect to the first circumferential direction of the refiner segment,
• wherein a distance between each inlet opening of a channel and a peripheral wall of the respective dam, with respect to the radially inner edge of the refiner segment, is zero.