Flakt Aktiebolag

Andritz Technology and Asset Management Gmbh

Rolf Petersson

Ingemar Karlsson

Karl-Hugo Andersson

Mats Nyhlen

The invention relates to an arrangement in cylinder drying, intended for incorporation in a paper machine and including a plurality of heated cylinders (1) arranged substantially parallel in two rows, about which the paper web (2) is taken serpentine during drying, whereat it is carried by an endless porous fourdrinier wire (3) which presses the web against the cylinder surfaces in one row of cylinders and lies between the paper web and the cylinders in the other row. For preventing the web from lifting from the wire as a result of pressure differences on either side thereof, there are blowing boxes (11,12) arranged for blowing out air in at least some of the pockets (4,5) situated on opposite sides of the web, each of said pockets being formed by the web and three cylinders lying consecutively in the travelling direction of the web. Blowing out from the blowing boxes takes place in directions such that a sub-pressure is generated in the pockets (4) where the wire (3) lies outmost towards the pocket, and an excess pressure generated in the pockets (5) where the paper web (2) lies outmost towards the pocket.

Arrangement in cylinder dryer

The invention relates to a sealing device in a cylinder drier, intended for incorporation in a paper machine and including a plurality of cylinders arranged in two substantially parallel rows (1a,1b), the paper web (2) being trained serpentine about said cylinder during drying, said web being carried by an endless porous Fourdrinier drier (3) adapted for pressing the web against the cylinder surfaces in one row of cylinders and situated between the paper web and the cylinder surfaces in the other row. Two shielding members (7,15) being disposed in the space restricted by the wire and an intermediate cylinder surface on that cylinder which the wire and the web come onto and leave. Said shielding members facing the wire and extending substantially in parallel with and close to the wire and over the entire width of the web. The end portion of each shielding member being free and extending into the area for the nip between the wire and the intermediate cylinder, whereas the opposite end portion is connected to a blowing box (10,14) provided with openings for blowing air in directions which are substantially in parallel with or form an acute angle to the wire, said air jets being directed in the opposite direction relative to the corresponding shielding member.

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Eneryda, Sweden

Rolf Petersson