公开(公告)号：US11325160B2

公开(公告)日：2022-05-10

申请号：US16641402

申请日：2018-08-31

申请人： ANDRITZ OY

发明人： Kari Peltonen ,  Janne Vehmaa ,  Vesa Kaipainen ,  Sami Siik ,  Sampsa Porkka

IPC分类号： B07B13/00 ,  D21D5/06

摘要： A separation device having a housing (10) with a feed conduit (1) and a reject conduit (2), between which conduits (1, 2) and an accept conduit (3) of the housing (10) is a rotor unit (13) having a shaft (4) transverse to the through-flow direction of the separation device, which shaft rotates discs (5) attached to the shaft (4), the outer surface and/or side surfaces of which discs are jagged, i.e. they have protrusions (6) and/or notches and/or these surfaces are substantially rough and the teeth (9) of at least two sieves (7, 8) attached to the housing (10), extend between the discs (5), the first sieve (7) being between the reject conduit (2) and the accept conduit (3) and the second sieve (8) being between the feed conduit (1) and the accept conduit (3).

公开(公告)号：US11473241B2

公开(公告)日：2022-10-18

申请号：US16613825

申请日：2018-05-15

申请人： ANDRITZ OY

发明人： Janne Vehmaa ,  Kari Kovasin ,  Ismo Reilama

IPC分类号： D21C3/02 ,  D21C3/22 ,  D21C3/00 ,  D21C3/24 ,  D21H11/02

摘要： A method of producing chemical pulp including at least the following steps: a) wood chips or other comminuted ligno-cellulosic fibrous material is treated with a polysulfide-containing cooking liquor in an impregnation stage at a temperature of 90-145° C., and b) slurry of fibrous material from step a) is heated into cooking temperature and cooked for producing pulp having a desired kappa number. After step a) mercaptide ions are added into the slurry of fibrous material and the fibrous material is treated at cooking temperature in step b).