Abstract: A sorter with a symmetric screen which is arranged concentrically in an essentially symmetric housing, and in the interior of which there is contained a concentric rotor drum that features on its periphery sorting elements sweeping across the screen, circulating at least parts of the suspension being sorted around the walls of the drum. The sorting elements are of a design such that they will generate a vortex flow of the suspension in the housing. The housing features at its periphery at least one removal duct for heavy contaminants and, in one of its end walls, a central lightweight dirt drain. The housing end wall that features the lightweight dirt drain has, in the direction away from the screen and the rotor drum, from radially outside to radially inside, a diameter that tapers in conic fashion by maximally 11 mm per each 3 mm of axial housing length, and minimally by 2 mm per each 3 mm of axial housing length.

Abstract: The invention concerns a process for the treatment of wastepaper, carried out for the most at a high consistency of at least 13% in the first stages, beginning the dissolution (soaking) and including a coarse sorting stage. The invention is characterized in that in the case of wastepaper containing a share of at least 40% of deinking wastepaper provided with printing inks the three first process stages, namely in this order of soaking, coarse cleaning and the further extensive dissolution of the wastepaper, take place at a considerable reduction of the wastepaper shreds to the usual speck size at a consistency of at least 13%, and the soaking under considerable addition of dissolving chemicals, and that the wastepaper including essentially all heavy contaminations, such as part of wood, glass, plastic or metal contained in the wastepaper, including pieces of metal straps of the wastepaper bales, is fed to the process.

Abstract: A screen basket comprising a plurality of rods each positioned approximately parallel to the rotational symmetrical axis of the basket, a plurality of rings for connecting the plurality of rods, wherein the plurality of rods form screen slots therebetween, and wherein the plurality of rods is fastened to the plurality of rings by either welding or soldering. Each rod has a cross-section and each of said plurality of rings has a recess in the shape of the section of the cross-section of the plurality of rods. The recess is adapted to receive the plurality of rods therein.

Abstract: A sorting apparatus for sorting fiber suspensions heavily laden with rubbish and other contaminants, which sorter has two successive sorting units each having a ring-shaped strainer space, which are likewise successive, and an accepts space with a rotationally symmetric strainer between the accepts space and strainer space. The first sorting unit is pressurized above atmospheric pressure; diluting water is fed to the second unit strainer space; and a rotating plate is mounted between the first and second sorting units to control the flow between the strainer spaces.

Abstract: A sorting apparatus has a first casing section (1) with a larger diameter and a second casing section (2) with a relatively smaller diameter, which casing sections are generally aligned in series. A rotor (6) has rotor parts which are coordinated with each casing section and appropriately adapted. An impeller rotates in a churning space (5) of the first casing section (1) and a drum type rotor section (9) in the second casing section (2) supports sorting elements (16), which rotate in a strainer space (12) formed by a cylindrical strainer basket (11). This provides both despeckling and sorting in the machine, and separates the rejects with a high solid content.

Abstract: In a pulping apparatus including a pulper with a rotor near the bottom therein, the pulper has a sluice outlet at the bottom for acceptable pulp suspension. Above the rotor at a corner of the pulper is a second outlet for suspension and dirt. A conduit leads from the second outlet to a horizontally oriented withdrawal apparatus chamber having a suspension agitating rotor at the end of the chamber opposite the entrance for pulp thereinto. A tangential outlet from the withdrawal apparatus chamber lead to a rotary, perforated sorting drum which permits exit of acceptable suspension and which has a rejected suspension and dirt outlet. A valve in the inlet to the withdrawal apparatus chamber is periodically and cyclically opened to permit periodic replacement of the suspension in the withdrawal apparatus chamber, and the suspension which has been agitated in the withdrawal apparatus chamber then moves to the sorting drum.

Abstract: A process and a secondary pulper used in a system for waste paper conditioning wherein the secondary pulper has a tumbling space separated from an accepted stock space by a screen. The secondary pulper includes a central drain line through which a fraction of fiber suspension enriched with light dirt is removed at one end of the secondary pulper, and a circumferential line through which a fraction of the fiber suspension enriched with heavy dirt is removed from the secondary pulper. A pulp inlet sleeve surrounds the central drain line and receives fiber suspension enriched with heavy dirt from the circumferential drain line through a conduit from the circumferential drain line to the pulp inlet sleeve so that the fiber suspension enriched with heavy dirt enters the tumbling space adjacent the entrance to the central drain line.

Abstract: A washing apparatus for processing and cleaning highly contaminated fibrous suspension made from waste paper and containing a high proportion of lightweight contaminants such as foils. The apparatus includes a generally circular rotation chamber and a good half-stuff chamber separated from the rotation chamber by a substantially planar strainer. A revolving rotor is fitted within the rotation chamber in front of the strainer. An entry chamber for receiving fibrous suspension in washing water communicates with the rotation chamber. The entry chamber is of a substantially smaller diameter than the rotation chamber and includes a washing water connection. A waste matter extraction line leads off from the rotation chamber.

Abstract: A system for wastepaper processing which uses a newly developed wash filter of a simple design. The wash filter includes a generally round agitating space and an accepted stock space. The accepted stock space is separated from the agitating space by an essentially flat screen. An agitating wheel is positioned within the agitating space and in front of the flat screen. An entrance space for receipt of fibrous suspension and wash water is also included in the wash filter. The entrance space has a smaller diameter than the diameter of the agitating space. Flow of the suspension from either a primary pulper or a secondary pulper is received in the entrance space of the wash filter. A tailing removal line is in communication with and extends from the agitating space of the wash filter.

Abstract: In a pulping apparatus including a pulper with a rotor near the bottom therein, the pulper having a sluice outlet at the bottom for acceptable pulp suspension. Above the rotor at a corner of the pulper is a second outlet for suspension and dirt. A conduit leads from the second outlet to a horizontally oriented withdrawal apparatus chamber having a suspension agitating rotor at the end of the chamber opposite the entrance for pulp thereinto. A tangential outlet from the withdrawal apparatus chamber leads to a rotary, perforated sorting drum which permits exit of acceptable suspension and which has a rejected suspension and dirt outlet. A valve in the inlet to the withdrawal apparatus chamber is periodically and cyclically opened to permit periodic replacement of the suspension in the withdrawal apparatus chamber, and the suspension which has been agitated in the withdrawal apparatus chamber then moves to the sorting drum.

Abstract: An arrangement is provided for use in treating suspensions of waste paper in waste paper dressing plants. The arrangement includes a comminuting apparatus which includes a disintegrating rotor wheel which has a transport and disintegrating affect is provided in combination with a pulper device. The disintegrating rotor wheel is adapted to rotate in advance or otherwise in front of a sieve arranged perpendicular to the axis of rotation of the disintegrating rotor wheel and which divides the interior of the comminuting apparatus into a useful fraction compartment and a disintegrating compartment. A conduit tube is provided for connecting the pulper device to the comminuting apparatus and is connected to the pulper device at the bottom, side or center thereof. In this manner, only that portion of the suspension which includes the impurity contents is transported from the pulper device to the comminuting apparatus. The comminuting apparatus thus serves to remove accumulated impurities from the pulper device.

Abstract: A rotor for a sorting apparatus for cleaning fibrous suspensions such as produced from the making of paper is described. The rotor is equipped with sorter blades which extend substantially parallel to the axis of rotation and are set at a desired angle relative to the direction of rotation of the rotor so as to create a hydrofoil effect. The sorter blades are mounted to one or more supporting walls shaped in a spiral form to provide spiral surfaces which are coaxial with the axis of rotation of the rotor and impart a conveying motion to the fibrous suspension. Upon rotation of the rotor in a fibrous suspension entanglements by impurities are avoided and the danger of the occurrence of a blockage of the strainer used in the sorter apparatus is reduced.

Abstract: A rotating sorter is provided for the removal of minuscule pollutants from fiber material suspensions by means of a symmetrical fixed filter basket disposed in a fixed spiral-shaped housing and in whose interior a generally vertical axle rotates sorter vanes in close proximity to the filter basket. Fiber material suspension to be sorted is delivered to a generally ring-shaped sorting space formed between the filter basket and housing. The direction of flow of fiber material suspension delivered to the filter basket occurs substantially tangentially thereto and generally perpendicular to the rotating axle, and quality material is sorted into the interior of the filter basket.

Abstract: An apparatus for sorting a fibrous suspension for removing both heavy weight and light weight particulate impurities is disclosed. An antechamber is positioned above a main chamber. Fibrous stock suspension is inletted tangentially to the antechamber and moves down to the main chamber. An annular rotor in the main chamber creates a vortex of the fibrous stock suspension, which drives the heavier particulate impurities to the side wall of the main chamber and moves the lighter weight impurities toward the center of the vortex. The heavier weight impurities fall to the bottom of the main chamber from which they are removed. The lighter weight impurities are removed by a drainage line extending toward the center of the antechamber. Above the rotor is a strainer and the rotor cooperates with the strainer to drive purified fluid suspension to an annular outlet chamber surrounding the bottom of the antechamber and from there into an outlet line.

Abstract: The disclosure concerns an apparatus for separating impurities from a fibrous suspension. The apparatus includes a tiltable housing having a screen basket supported coaxially therein. A rotor is supported inside the screen basket. The rotor has three zones. There is an upstream zone communicating with the fiber suspension inlet, and inlet in the upstream zone is into the interior of the rotor and then outward past sorting vanes formed at the exterior of the rotor in the first zone and inside of the basket. Downstream of the transport vanes is a second baffle zone defined by a closed drum having transport vanes on the outside thereof. The suspension and impurities are moved downstream by the transport vanes in the second zone. Downstream of the second zone is a third zone with further means for moving impurities downstream, comprising either a centrifugal impeller in the form of vanes or a helical ring.

Abstract: A process and plant for treating waste paper in which a beater is employed for rough-pulping the waste paper followed by a first sorting stage from which the separated-out foreign matter is processed further in a subsidiary circuit which includes a vibratory sorter for lightweight foreign matter and a hydrocyclone for heavy foreign matter, the fibers separated out during this further processing being returned again to the treatment process. In the first sorting stage, a sufficiently rigorous separation process is carried out to remove the greater part of the foreign matter, together with unpulped lumps of fibers, which is then passed to the subsidiary circuit in which it and half-stuffs still containing foreign matter, which have been sorted in the hydro-cyclone and in the vibratory sorter, are subjected together to a multi-stage further sorting and speck-removing process.

Abstract: An apparatus for purifying a fibrous suspension which contains contaminants of varying size and mass has a housing and a rotor for imparting a vortex motion to the fluid contained in the housing. Lighter contaminants are collected in the core of the vortex and travel generally on axis to an opening in the end of the housing. Heavier contaminants acquire radial velocity due to centrifugal force and migrate to the wall of the housing when the stream is deviated by nearly 180.degree.. The liquid then traverses a surrounding screen which retains further contaminants. Provision is made for comminuting specks and the like.