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WO/1991/006703A1 |
A screening apparatus (10) comprises a pair of stationary concentric screens (26 and 32) with a plurality of foil structures (42) rotating therebetween and adjacent thereto, individual foils (44 and 46) of each foil structure being radia...
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WO/1991/006374A1 |
The invention relates to an arrangement for a centricleaner comprising an upper (1) and a lower cleaner chamber (2), in which a suspension which shall be cleaned is fed through an inlet (4) located in the upper part of the external wall ...
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WO/1991/005912A1 |
In a process and a device, a cellulose suspension of thin consistency, the consistency and flow rate of which is known, is conducted to the suction side of a main pump (4), to the pressure side of which there are coupled in sequence a fi...
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WO/1991/005911A1 |
A replaceable screen structure for a stock screen wherein stock slurry for making paper is passed through a screen (18) with the rejects going to a reject outlet (12) and the accepts passing through openings in the screen to an accepts o...
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WO/1991/002841A1 |
A refiner element (10) for the refining of fibrous material is provided with a comminuting surface of which at least a portion comprises an abrasive surface. The method of forming the refiner element (10) comprises casting a metal substr...
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WO/1991/001810A1 |
An apparatus (10) is illustrated in the invention for removing coarse particles, such as sand, metal chips, etc., from a liquid, whereby the apparatus is in the first place aimed at separating coarser particles from the so called reject,...
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WO/1991/001406A1 |
A multi-stage process, and apparatus for carrying out the process, are provided for refining lignocellulose containing material at high consistency. The lignocellulose material is pretreated to form a mixture (11) of the lignocellulose m...
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WO/1991/000768A1 |
The present invention relates to a method and apparatus for treating pulp, which method and apparatus are especially suitable for treating fiber suspensions in wood processing industry. The method and apparatus are particularly designed ...
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WO/1991/000387A1 |
The invention relates to a method of purifying pulp and to a separating apparatus. According to the method, the pressure difference across the hydrocyclone (1) is kept substantially constant by raising the pressure of the pulp conducted ...
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WO/1990/015183A1 |
The present invention relates to a method of and an apparatus for separating heavy impurities from fiber suspensions in a centrifugal pump. The method and the apparatus of the invention are in particular suitable for the treatment of fib...
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WO/1990/014462A1 |
The fibers of recycled paper are cleaned by agitating the slurry containing the fibers to maintain the fibers in suspension, and contacting the slurry with wash water to remove ink and other contaminants. The apparatus includes a passage...
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WO/1990/014464A1 |
Grinding equipment for a jordan refiner for grinding paper pulp having a rotating part in the form of a truncated cone and a stationary part (1) in the form of a hollow truncated cone, on which rod-shaped knives (5, 7) are arranged at pr...
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WO/1990/013344A1 |
The present invention relates to a method of and an apparatus for treating pulp. The apparatus according to the present invention is especially suitable for carrying out bleaching processes of the wood processing industry and for separat...
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WO/1990/011836A1 |
A device for separating fibres and gas, comprising a cyclone (1) with inlet (2) for a mixture of fibre/gas and separate outlets (3 and 5, respectively) for fibres and gas, respectively. In front of the gas outlet (5) a screen (6, 10) is ...
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WO/1990/012147A1 |
A screen cylinder is made up of a plurality of identical ceramic elements in arcuate form having screen openings, and opposite longitudinally extending edges carrying a tongue and groove, respectively. The elements are joined one to the ...
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WO/1990/010109A1 |
An improved pressure washer (10) and process are disclosed for washing cellulose pulp, wherein a mat of pulp (113) is provided on a rotating drum (40) and moves through a washing zone (54) and a dewatering zone (56) between the mat forma...
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WO/1990/010110A1 |
The present invention relates to a method and apparatus, the purpose of which is to separate more efficiently than hitherto liquid from liquid/fiber suspension by dividing the suspension into two portions, of which one includes mainly li...
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WO/1990/009242A1 |
The present invention relates to a method and an arrangement in a fibre reclaimer for cleaning of as well as heavy and light contaminate particles from a fibre suspension and said fibre reclaimer comprises at least a vessel (4) having an...
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WO/1990/009480A1 |
An appliance for sorting and deflaking fibre suspensions has a rotor with a horizontal axis rotatively mounted in a housing. In a first, inlet rotor zone the rotor is provided with entraining means for extracting by centrifugation contam...
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WO/1990/006396A1 |
In a method of fractionating suspensions, preferably containing fibre pulp, the suspension to be fractionated is sprayed in the form of at least one jet (at 8a) against one side of a filter sheet (2-5) during displacement of the filter s...
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WO/1990/005807A1 |
The screening device comprises a casing (1) with inject inlet (2) and accept and, respectively, reject outlet (3 and, respectively, 4). In the casing a cylindric screening member (5) is located stationary, and within the same a concentri...
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WO/1990/004673A1 |
The invention relates to a method of manufacturing fibre pulp from lignocellulose-containing material, where the material is disintegrated between two grinding discs rotating relative to each other. According to the invention, the materi...
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WO/1990/004675A1 |
A plurality of blind openings (e.g. holes or slots) are formed through a first face of a steel plate and extend a predetermined distance short of the opposite face. Larger size openings are formed through the first face using the blind o...
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WO/1990/003223A1 |
To improve the separating efficiency of a cyclone-type stuff cleaner, the rotationally symmetrical inner wall (3) of the separating chamber (1) is provided with dead spaces (4) relative to the throughflow. These dead spaces extend essent...
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WO/1990/002839A1 |
The invention relates to a device for the separation of particles in a liquid, wherein the suspension to be purified is supplied to a revolution housing (1) rotating about an axis (2), and wherein the moving deviation means (7, 8) precee...
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WO/1990/002223A1 |
In a method of treating wood-fibre pulp, particularly pulp which contains recycled paper, the pulp is dewatered and then heated by means of superheated steam under pressure prior to being passed to a disperser (10), in which the pulp is ...
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WO/1990/001371A1 |
The present invention provides a regulator (110) for a refiner or grinding apparatus having opposed relatively rotatable grinding discs (28, 30). Each grinding disc (28, 30) carries a grinding segment, and a predetermined gap or grinding...
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WO/1990/000646A1 |
The invention regards hydrocyclone separation, particularly of cellulose fibers, where the object is to eliminate light contaminants, and where the useful product is exited through apex outlets (13). In order to have good separation effi...
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WO/1990/000645A1 |
A method and apparatus for the removal of light material from a fiber supension particularly suitable for removing light compressible plastic material such as expanded polystyrene and similar material from the short circulation of a pape...
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WO/1989/012137A1 |
A paper pulp screening apparatus (8) wherein a modular cylindrically-shaped screen plate assembly (10) is formed of a thin material of uniform thickness bent to form an undulating shape to increase the screening area, and the screen sect...
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WO/1989/011560A1 |
A device for discharging a reject containing undesired solid particles from a separation device, in which said reject is separated from a mixture of liquid and solid particles, preferably a fibre suspension, the mixture being subjected t...
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WO/1989/010998A1 |
The invention relates to a method of manufacturing mechanical and chemi-mechanical papermaking pulp with low energy input by disintegrating and beating wood material in at least two steps. According to the invention, the material is coar...
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WO/1989/010446A1 |
Mechanical treatment of a pulp slurry of up to 50 % O.D. consistency by dewatering and compacting the pulp permanently twists and kinks individual fibers to a degree that is substantially irreversible when they are subsequently subjected...
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WO/1989/007687A1 |
In a process for controlling a pulp grinder, the temperature of the spray-diluting water is controlled so that the temperature increase in the grinding zone is below the vaporization point. For this purpose, the specific power consumptio...
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WO/1989/007169A1 |
Process for mechanical fibre removal from a lignocellulose material obtained by a preliminary impregnation treatment of chippings by a reagent which promotes softening of the lignin. Said process is characterized in that it consists in p...
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WO/1989/006719A1 |
The invention relates to a screen plate for screening or fractionating fibre suspensions, especially suspensions of papermaking pulp, which screen plate is of the type where the screen holes are arranged in rows substantially perpendicul...
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WO/1989/006718A1 |
An improved paper for printing and other uses can be made from a paper pulp that contains pulp derived from hardwoods if the pulp is refined in a refiner that has at least one abrasive surface disk. The pulp can be refined to give a vess...
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WO/1989/002783A1 |
In a disc refiner with two opposed refining discs (1, 2) rotary relative to each other the contact position for the refining surfaces (9, 10) is indicated. The refining discs (1, 2) are moved against each other during relative rotation w...
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WO/1989/000624A1 |
This publication discloses a method and an apparatus for controlling the production of refined stock. According to implementation of the invention, chips are metered by metering elements (3, 7) into a feed chest (2), feed elements (3, 7)...
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WO/1988/010335A1 |
An apparatus for screening paper stock comprises a vessel, a cylindrical screen cylinder within the vessel, a rotating element moving in the vicinity of the screen cylinder at a predetermined speed, an inlet for unscreened stock, an outl...
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WO/1988/009843A1 |
The pulp screening apparatus comprises a housing having an inlet for allowing fibrous stock to be introduced into the interior, a first outlet for allowing the accept screened stock to be removed, a second outlet for the reject, a screen...
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WO/1988/008957A1 |
An apparatus and method for measuring the gap, tram, deflection, and wear of rotating grinding plates (4) wherein inductive sensors (24) are mounted in a recessed manner inset from the surface (12) of a first grinding plate (2) and locat...
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WO/1988/006490A1 |
A refiner segment (1) for disc refiners is formed with a pattern of bars (2, 4) and grooves (3, 5), and flow restrictions (6) are located in the grooves (5). Through apertures (8) in the bars (4), the grooves (5) communicate with each ot...
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WO/1988/003189A1 |
A refiner, preferably a disc or conical refiner, with two opposed, closely spaced bodies of which at least one, the so-called rotor (2), rotates and which are provided with blades (4, 8; 5, 9), the material to be refined being ground in ...
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WO/1988/003054A1 |
Method and device for measuring the distance (delta) between the discs of a refiner, in which method a magnetic field is generated by means of a coil (5) placed at one disc (4), which magnetic field is allowed to run at least partly thro...
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WO/1988/001317A1 |
A bearing assembly (40) is provided for supporting a rotatable and axially displaceable shaft (16) of a disc-type refining apparatus (10). An annular retainer ring (44) is mounted non-rotatably about the outer annular ring (54) of a bear...
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WO/1988/000992A1 |
The apparatus is intended for the screening and mechanical working of fibre suspensions. In an air-tight housing (80) with inlet (74) and accept outlet (86) an outer stator (83, 100, 102) and an inner rotor (10) are located so that betwe...
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WO/1987/006963A1 |
Grinding block (1) for a refiner, consisting of a sector or part of a sector of a grinding disc or cone made of stainless steel. In known refiners, the worst drawback with the kinds of steel (with a carbon content of 1.2 - 1.5 %) used in...
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WO/1987/006280A1 |
Method of reducing the energy consumption at the refining/beating of cellulose-containing material by the addition of alkali to the material for neutralizing acid groups bonded to the fibre wall. According to the invention, the pH-value ...
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WO/1987/005954A1 |
The processing comprises screening for dividing the pulp into an accept and a reject fraction, of which the reject fraction constitutes 10-40%. The reject fraction is dewatered, impregnated with sodium sulphite and preheated with steam. ...
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