Abstract: A filter press having a main press with an after-pressing device spaced from the outlet end of the main press which device carries out the final pressing and is composed of at least two press roll pairs (1,2), made up of rolls (3,4,5,6) between which the wires (7,8) belonging to the main press pass with the pulp (9) being filter pressed interposed between the wires and pressed by action of a pressing force (F) directed against the topside rollers (3,5) of the press roll pairs and produced by a force applicator such as a pressure cylinder (10). The pressure ratio (F.sub.1 /F.sub.2) between the topside rollers (3,4) and the bottom side rollers (5,6) is adjustable by the aid of a control setup.

Abstract: Disk refiner for cellulose, paper or other equivalent pulp, with two mutually opposed blade disks, at least one of which is rotatable, carrying grinding surfaces facing each other and having within the circumference defined by the grinding surface of one blade disk, in the pulp inlet duct, a sieve plate concentric with the blade disks. Within the sieve plate there is a concentric guide plate so that between the sieve plate and the guide plate there is defined a gap through which the pulp to be refined goes to the grinding surfaces.

Abstract: In connection with a land clearing saw, a sapling control substance dispensing device comprising a container for the sapling control substance, a control substance nozzle and a control substance duct leading from the container to the nozzle, this duct incorporating a manually operable valve (1) comprising a piston (4) provided with return spring (11) and a cylinder (5), with ports for the control substance entry duct (6) and exit duct (7), these ducts being provided with check valves (8,18). Within the piston has been installed an auxiliary piston (14) loaded with a spring (16) and which as the piston (4) is being moved opens or closes a needle valve (9) associated with the exit duct port.

Abstract: Hydrocyclone for dividing a substance mix into an acceptable fraction and a reject fraction containing dirt substances, the hydrocyclone including a separating chamber, which in part consists of a cylinder part, provided with at least one tangential feed connector for the substance mix and with a coaxial exit tube for the acceptable fraction, and which in part consists of a sorter cone on the extension of the cylinder part, having at its apex an exit aperture for the reject fraction.

Abstract: Filter press for separating the liquid from the silt of sludge by using running filter strips guided by rollers journalled in bearings in the girder frame of the filter press. One side section of the frame is equipped with removable frame sections for the purpose of exchanging the filter strips and the opposite side section of the frame has been equipped with pull rods, supporting the frame during the exchange of the filter strips. The lower ends of the pull rods are secured to the ends of telescopic support extensions, extentable sideways from the lower part of the frame and the upper pull rod ends are attached to the upper section of the frame.

Abstract: The invention disclosed concerns a procedure for purifying waste wter containing chlorinated phenolic compounds, such as the bleaching effluent of a sulphate cellulose pulp mill. The purification is carried out biologically in a floating bed reactor which has been inoculated with a bacterial population decomposing chlorinated phenolic compounds and wherein the bacteria use the floating particles for affixing substrate. The purification takes place in the reactor under anaerobic conditions, and the water removed from the reactor may be oxygenated or aerated and conducted to a supplementary aerobic purifying step, where another floating bed reactor or a bark filter is used.

Abstract: Hydrocyclone for dividing a fibre suspension into a lighter acceptable fraction containing fibres and a heavier reject fraction containing dirt substances. The hydrocyclone comprising a separation chamber consisting in part of a cylinder part provided with at least one passage for the tangential input of the fibre suspension to be divided into different fractions and having within itself a coaxially disposed tube for removal of the lighter fraction, and in part of a sorter cone on the extension of said cylinder part and on the apex of which has been adjoined a conical nozzle which has been made more abruptly tapering than the cone part and which at its apex has a removal aperture for the heavier fraction.

Abstract: A hydrocyclone for dividing fiber suspensions into accept and reject fractions, said hydrocyclone being constituted by a conical separation chamber vertically positioned and having at its lower apex end an outlet aperture for the reject fraction, and a base part associated with the upper end of said separation chamber and provided with at least one inlet opening for the fiber suspension, an accept pipe being arranged coaxially with said separation chamber and said base and passing through the top of said base, said accept pipe having its lower inlet end at a level between said inlet opening for the fiber suspension and said outlet aperture for the reject fraction, and the outer surface of the accept pipe having the shape a truncated cone and being further provided with an annular projecting lip forming a discontinuity in said outer surface, the lower side of the lip, facing the reject outlet, having a curved concave shape in order to deflect part of the vortex impinging thereon back towards the reject outlet.

Abstract: Disk defibrator presenting a feed device for supplying the material which one desires to defibrate, such as wood chips, into the throat of the disk defibrator with the aid of a screw conveyor, the steam generated during the defibration process escaping through the feed device in countercurrent to the material flow and further passing to the atmosphere through an exit aperture on the feed device. The feed device includes two feed screws side by side with an intervening space into which the steam freely discharges.

Abstract: A chip washer comprising a tank holding washing fluid, a conveyor for supplying chips into the tank, a vane for setting the fluid and therewith the chips into motion in the tank, a conduit provided with valve for removal from the tank of the foreign substances separated from the chips and a washed chips removing conveyor, this latter consisting of a screw conveyor ascending obliquely upwardly from the tank with its lower end extending into the washing fluid and the mantle of which is constituted by a strainer tube. The strainer tube of the screw conveyor is encircled by a collecting tube or trough, which returns the washing fluid running off the chips, back to the tank.

Abstract: The discharge opening from a silo is formed by two generally upwardly extending bottom plates placed in a V-shaped configuration. The bottom plates are reciprocatingly movable with the aid of hydraulic cylinders. At their lower ends the bottom plates form an aperture for the discharge of goods from the silo. The bottom plates are pivotally suspended at their top margins. Their lower margins are pivotally interconnected by means of connecting pieces. The hydraulic cylinders are pivotally connected to the connecting pieces and to the bottom plates and the pivotal connections of the connecting pieces to the bottom plates and hydraulic cylinders from a linkage quadrangle. The hydraulic cylinders are arranged to move the linkage quadrangle thus produced, in such a manner that the bottom plates will swing reciprocatingly about their top edges or margins.

Abstract: Waste water purifying procedure intended to be used in treatment of waste water containing aromatic compounds. In a biofilter in a layer containing bark of wood there is formed a bacterial population comprising one or several of the bactery strains deposited in the Universite of Helsinki Institute of General Microbiology under the deposition codes YM 134-202 and YM 241-268 and which have been formed by packing into biofilters crushed coniferous tree bark and bacteriferous water, ooze, mud or bark residues taken from a water body polluted by chlorinated and unchlorinated phenols and by aromatic carboxylic acids and by thereafter feeding into the biofilters water containing said substances, whereby the bactery strains are characterized by tolerance of the presence of chlorinated and unchlorinated phenols and of aromatic carboxylic acids, and the waste water to be purified is conducted through the biofilter, whereby the waste water is purified by effect of action of the bactery population.

Abstract: A hydrocyclone assembly consisting of two identical hydrocyclones having accept tubes directed against each other so that the longitudinal axes of the hydrocyclones are aligned, and including a joint feed chamber and a joint accept chamber in which the combined accept fraction from the hydrocyclones accumulates. The accept ends of the hydrocyclones' accept tubes are connected with each other and the accept fractions are conducted into and combined in connecting ducts which communicate with the accept chamber.

Abstract: Means for separating gas from a liquid suspension, in particular from a fibre suspension which is going to be conducted to a paper machine, the means including a separation space wherein a dispersion nozzle has been mounted to serve the purpose of atomizing into droplets the suspension introduced into the upper part of the separation space and which has been provided with a drain pipe for removal of the suspension relieved of gases that accumulates in the lower part of the separation space, and a gas removal space connected to a vacuum source and which at the same time communicates with the separation space so that the gas can be liberated from the suspension with the aid of subatmospheric pressure and drawn out of the separation space. In the wall confining the separation space and the gas removal space there have been formed one or several upwardly widening gas removal apertures by which the spaces communicate with each other.

Abstract: For a disk refiner which includes a frame with a refiner housing, a driving shaft, and a driving motor, a mounting base in the form of an integrated block made of a material absorbent to vibrations of the disk refiner, said block having at one end, symmetrically in relation to the longitudinal central line of the base, support surfaces for the driving motor and, at its other end, two front supports for the refiner frame and, at a distance from said front supports, two rear supports for the refiner frame, said front and rear supports being situated pairwise symmetrically in relation to the shaft of the refiner, essentially in a plane extending along the longitudinal central line of the shaft, and at the ends of column-like projections extending upwards from a plane defined by said support surfaces.

Abstract: Disk filter comprising a tank for the liquid to be filtered, a tubular shaft carrying, spaced in its longitudinal direction, filtering disks which consist of functionally independent, hollow filtering sectors communicating through holes made in the mantle of the tubular shaft and located at the tips of the sectors with the interior space of the tubular shaft, the different filtrates coming from the filtering sectors being removed from the different chambers with the aid of vacuum introduced into said interior space. The chambers are established when within the tubular shaft there is placed a slide member which is stationary as the shaft rotates and which divides the interior of the shaft in the transversal direction into sectors and which is confined by ends at either of the shaft.

Abstract: A disk refiner construction to be supported on a base and including first and second frame parts, said first frame part having inside a pressure proof housing attached at its periphery to said first frame part, a shaft extending into said housing and provided with a gasketing sleeve serving as a gasket for said housing, a disk attached to the end of said shaft and provided with refiner plates within the housing, and an end plate of the refiner being attached to the first frame part and provided with stationary counter plates for said refiner plates, the second frame part having inside a bearing unit for the shaft of the refiner and said first and second frame parts constituting together an uninterrupted frame having the shape of a hollow rotational body and serving as a guide and support for the shaft and its bearings, said body being further provided with fixation points positioned symmetrically in relation to the shaft for supporting the disk refiner on its base.

Abstract: A biofilter for treatment of waste waters and gases, comprising a bed of coniferous tree barking residue containing microorganisms and where the waste water to be treated can be uniformly conducted upon the barking residue bed and from below the barking residue bed oxygen containing gas can be blown against the waste water flow. The barking residue bed has been partly placed in a depression provided liquid and gas tightly in the ground, and that on the bottom of the depression there is a pipe system for draining the waste water that has traversed the barking residue bed and for conducting oxygen containing gas into said bed.

Abstract: A hydrocyclone for the separation of a liquid suspension into accept and reject fractions, having a conically converging classification pipe, at the apex of which there is an opening for the reject fraction, and a base part in which there is an axial pipe for the accept fraction, and a minimum of two feed channels for the liquid suspension to be purified, in which the feed channel directs the liquid suspension onto an incline in the circular space between the classification pipe and the accept fraction outlet pipe, and the liquid suspension spray discharges from the incline over the spray in the following feed channel.

Abstract: A chip washer which has its cylindrical upper part an upwards directed outlet pipe and an outlet channel for washed chips and in which the foreign materials separated from the chips sink into the funnel part attached to the upper part as its continuation, the funnel part having been linked by means of a valve to a tubular part to remove foreign materials. The washer is partly or entirely filled with a washing liquid which is introduced tangentially from close to the edge of the upper part of the washer in such a manner that the washing liquid is put into a circulatory motion forcing the chips fed from the upper part of the washer downwards in the circular space between the side wall of the upper part and the outlet pipe, whereby the chips freed from foreign materials pass into the outlet pipe and from there into the outlet channel, and the foreign materials pass into the funnel part and further through the valve into the tubular part.