the sealed faces to lubricate the contact faces between the seals and the mantle 11 in the manner illustrated in fig2 the suction box 12 of the suction roll 11 is provided with separate grinding ribs 20 21 or equivalent which can be positioned more specifically in the manner illustrated in fig2 the roll mantle 11 of the suction roll 10 is removed from around the suction box 12 and the upper edges of the suction box 12 are provided with the grinding ribs 20 and 21 the axial seals 15 and 16 are removed thereat and the grinding ribs 20 and 21 are situated in accordance with the present invention into the places of the seals i e into their sealing sockets 15a and 16a as illustrated by the dashed lines fig3 a and 3b give more detailed illustration of the construction of a suction roll in accordance with the present invention according to the invention it has now been found that the conventional liquid lubrication system fitted in connection with the seals 15 and 16 can be used for passing the grinding fluid or grinding material to the point to be ground thus pressure medium supply ducts 17 18 and 19 illustrated in fig1 have been converted to grinding fluid supply ducts 17 39 18 39.