公开(公告)号：EP1853760B1

公开(公告)日：2008-10-08

申请号：EP06716944.1

申请日：2006-02-27

Applicant: STFI-Packforsk AB

Inventor： NORMAN, Bo ,  HERMANSSON, Lennart

IPC: D21F1/36 ,  D21F9/00

CPC classification number: D21F1/483 ,  D21F9/003

Abstract: Dewatering arrangement adapted to use in a twin-wire dewatering section of a paper machine, comprising a rotating forming roll, a head box for supplying stock arranged before the forming roll, a closed loop first wire adapted to, be partly wrapped around the forming roll to a separation line where its contact with the forming roll ceases, and to receive the stock from the head box on its surface not facing the forming roll, a closed loop second wire adapted to be partly wrapped around the forming roll on top of the first wire thereby pressing the stock between itself and the first wire, a first blade, substantially parallel with the forming roll, is arranged to support the lower side of the wire after the separation line of the forming roll and is arranged such that the tip of the blade is directed against the wire transporting direction, The distance from the separation line to the blade is less than 100 mm. By supporting the wire close to the forming roll movement of the first wire is suppressed, thus reducing unwanted effects like sheet damages.

公开(公告)号：EP1853760A1

公开(公告)日：2007-11-14

申请号：EP06716944.1

申请日：2006-02-27

Applicant: STFI-Packforsk AB

Inventor： NORMAN, Bo ,  HERMANSSON, Lennart

IPC: D21F1/36 ,  D21F9/00

CPC classification number: D21F1/483 ,  D21F9/003

Abstract: Dewatering arrangement adapted to use in a twin-wire dewatering section of a paper machine, comprising a rotating forming roll, a head box for supplying stock arranged before the forming roll, a closed loop first wire adapted to, be partly wrapped around the forming roll to a separation line where its contact with the forming roll ceases, and to receive the stock from the head box on its surface not facing the forming roll, a closed loop second wire adapted to be partly wrapped around the forming roll on top of the first wire thereby pressing the stock between itself and the first wire, a first blade, substantially parallel with the forming roll, is arranged to support the lower side of the wire after the separation line of the forming roll and is arranged such that the tip of the blade is directed against the wire transporting direction, The distance from the separation line to the blade is less than 100 mm. By supporting the wire close to the forming roll movement of the first wire is suppressed, thus reducing unwanted effects like sheet damages.

公开(公告)号：EP1853759B1

公开(公告)日：2008-07-30

申请号：EP06716945.8

申请日：2006-02-27

Applicant: STFI-Packforsk AB

Inventor： NORMAN, Bo ,  HERMANSSON, Lennart ,  SÖDERBERG, Daniel

IPC: D21F1/02 ,  D01F1/06

CPC classification number: D21F9/003 ,  D21F1/02 ,  D21F1/028

Abstract: Dewatering arrangement adapted to use in a twin-wire dewatering section of a stock processing machine, comprising a single-ply head box (4) for supplying stock through a nozzle (8) with an inlet (11 ) fed by a tube bank (6) with tubes (7) of non-circular cross- section, a closed loop first wire (2) adapted to receive the stock from the head box (4) on its upper surface and with pressure pulse generating blades (5) mounted inside the loop, a closed loop second wire (3) adapted to be fed on top of the first wire (2), and with pressure pulse generating blades (13) mounted inside the loop, thereby pressing the stock between itself and the first wire (2). The inlet height of the headbox nozzle (8), defined as the total tube bank height minus the total upstream thickness of eventual nozzle vanes (14), is at least 150 mm. By using a larger height of the headbox nozzle it is possible to lessen the risk of formation damages and also to use a higher slice opening, without formation disturbances. This in turn also gives better potential for paper strength and formation. The arrangement is suitable to both paper and paper board machines.

公开(公告)号：EP1853759A1

公开(公告)日：2007-11-14

申请号：EP06716945.8

申请日：2006-02-27

Applicant: STFI-Packforsk AB

Inventor： NORMAN, Bo ,  HERMANSSON, Lennart ,  SÖDERBERG, Daniel

IPC: D21F1/02 ,  D01F1/06

CPC classification number: D21F9/003 ,  D21F1/02 ,  D21F1/028

Abstract: Dewatering arrangement adapted to use in a twin-wire dewatering section of a stock processing machine, comprising a single-ply head box (4) for supplying stock through a nozzle (8) with an inlet (11 ) fed by a tube bank (6) with tubes (7) of non-circular cross- section, a closed loop first wire (2) adapted to receive the stock from the head box (4) on its upper surface and with pressure pulse generating blades (5) mounted inside the loop, a closed loop second wire (3) adapted to be fed on top of the first wire (2), and with pressure pulse generating blades (13) mounted inside the loop, thereby pressing the stock between itself and the first wire (2). The inlet height of the headbox nozzle (8), defined as the total tube bank height minus the total upstream thickness of eventual nozzle vanes (14), is at least 150 mm. By using a larger height of the headbox nozzle it is possible to lessen the risk of formation damages and also to use a higher slice opening, without formation disturbances. This in turn also gives better potential for paper strength and formation. The arrangement is suitable to both paper and paper board machines.