Device for mechanically processing lignocellulose-containing fibrous material

A device for mechanically processing lignocellulose-containing fibrous material, the device comprising:

• at least two oppositely positioned processing discs at least one of the processing discs being arranged to be rotated relative to at least one other processing disc, each processing disc having at least one processing plate attached thereto, the processing plates having processing surfaces provided with projecting parts, each processing surface having an inner periphery and an outer periphery and defining a radial direction from the inner periphery to the outer periphery;
• wherein at least some of the projecting parts comprise a radially inner part having an inclined ascending wall towards the outer periphery of the processing plate and a radially outer part having an inclined descending wall towards the outer periphery of the processing plate;
• wherein the radially inner part and the radially outer part are radially coupled to each other by a ridge along a coupling line between the radially inner part and the radially outer part and wherein the inclined ascending wall and the inclined descending wall are mutually connected only partly so that they have in common only a crest section of the ridge which defines a width of the crest section;
• wherein the radially inner part inclined ascending wall defines a first width at the crest section and the radially outer part inclined descending wall defines a second width at the crest section;
• and
• wherein the width of the crest section is less than at least one of:
• the first width and the second width.