Mo Och Domsjo Aktiebolag

Sunds Defibrator Aktiebolag

Rolf B Lundgren

Claes G Svensson

Hans E Eriksson

Methods and apparatus for separating vapor from refined cellulosic material are disclosed. The method includes discharging the refined cellulosic material downwardly through an inlet opening into a discharge chamber maintained at substantially the same pressure as the refiner, deflecting the vapor laterally with respect to that cellulosic material, passing the vapor through the discharge chamber at a flow rate of less than 15 meters/sec. so that the cellulosic material carried by the vapor is separated from the vapor by sedimentation, and discharging the cellulosic material from the discharge chamber. The apparatus includes a discharge chamber with an inlet and an outlet, and a portion laterally disposed with respect to the inlet, a conveyor for moving the cellulosic material laterally towards the discharge chamber outlet to create a substantially gas-tight plug of cellulosic material in order to maintain the discharge chamber substantially at the pressure at which the cellulosic material is refined, the conveyor permitting the vapor to pass laterally with respect to the inlet opening and a vapor outlet located in the portion of the discharge chamber laterally disposed with respect to the inlet.

Vapor separating method and apparatus

Process and apparatus are provided for continuously conveying particulate compressible fibrous material from a first zone at a first gas pressure to a second zone at a second gas pressure with a pressure differential therebetween of at least 0.5 bar while retaining the prevailing gas pressure in each zone, which comprises:

Process and apparatus for continuously conveying particulate

A screw conveyor is provided capable of maintaining a relatively uniform flow of conveyed material, even when operating well below its flow capacity, having a helical screw with a plurality of helical blade segments at one end, each segment extending over an arc of from about 100.degree. to about 130.degree. about the central stem of the screw, and having a pitch length within the range from about 0.5 to about 3 times the pitch length of the helical screw; the pitch length of the helical screw being from about 0.5 to about 1 times its diameter; the segments being spaced apart a distance within the range from about 0 to about 22 mm; the plurality of segments taken collectively defining a plurality of through passages extending axially along the central stem of the screw, and extending in uniformly spaced relationship .+-.10.degree. circumferentially about the 360.degree. circumference of the passage; each segment having a base portion attached at its inner periphery to the central stem of the screw over an arc of from about 50.degree. to about 60.degree., and a wing portion extending about and closely abutting the inside wall of the passage, and terminating in a tip abutting the inside passage wall, the wing portion defining an open space between its inner periphery and the central stem of the screw, the space forming a part of a through passage defined by the segments.

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Sundsvall, Sweden

Rolf B Lundgren