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| Number | Title | Issue Date |
| 6454900 | Method for two-stage oxygen delignification of chemical pulp Methods for oxygen delignification of a pulp are disclosed, including initially delignifying the pulp at a delignification temperature of less than 90° C., adding oxygen to the pulp so that the oxygen is present during the initial delignification step, a... | 09/24/2002 |
| 6080344 | Method of pre-pressing fibrous material during the manufacture of board products Methods for prepressing lignocellulose-containing fibrous material are disclosed including forming a lignocellulose-containing fibrous material into a web, initially compressing the web and permitting expansion of the web, recompressing the web in an entr... | 06/27/2000 |
| 6042036 | Refining element Refining elements are disclosed for use in refiners in which the refining elements comprise a refining surface with a plurality of raised bars alternating with a plurality of grooves. The raised bars at the inlet of the refining path have a first spacing ... | 03/28/2000 |
| 6036818 | Pulp-dewatering roll press Pulp-dewatering apparatus is disclosed including a pair of press rolls and a rotatable pulp disintegrating screw above the nip region between the press rolls, and the apparatus includes a pair of doctor bars associated with the pair of press rolls, each d... | 03/14/2000 |
| 6000552 | Process for purification of a fiber suspension A process for the purification of a fiber suspension (deinking or white water) in which a mixture of fiber suspension and gas bubbles are jtted into a flotation tank in an upwardly directed manner toward the free surface of the pulp at a velocity of great... | 12/14/1999 |
| 5996770 | Plug screw feeder Screw feeders are disclosed including a conical feed screw rotatably disposed in a conical screw tube, and a drive shaft mounted at one end of the conical feed screw with a pair of bearings mounting the drive shaft, a fixed ring mounted on the drive shaft... | 12/07/1999 |
| 5989465 | Method of manufacturing a board Methods of manufacturing board products include the steps of drying lignocellulosic material in a first stage dryer, further drying the lignocellulosic material in a second stage dryer, forming the dried lignocellulosic material into a mat, hot pressing t... | 11/23/1999 |
| 5989468 | Method of continuous production of lignocellulosic boards Methods for the continuous production of compressed board are disclosed including drying lignocellulosic fibrous material, gluing the lignocellulosic fibrous material, forming a mat, and pre-compressing the mat by controllably adding steam to the mat in a... | 11/23/1999 |
| 5980689 | Method of separating metal ions from pulp using a chelating agent Methods for separating metal ions from pulp material are disclosed including treating the pulp with a chelating agent to produce a pulp flow with dissolved metal ions, washing that pulp flow prior to bleaching with hydrogen peroxide or ozone and mixing th... | 11/09/1999 |
| 5970862 | Seal in a roll press Apparatus for sealing a roll press including a seal extending along at least one of a pair of press rolls, the seal including a resilient member extending from the vat in which the press rolls are disposed towards one of the press rolls and a wear member ... | 10/26/1999 |
| 5950946 | Pair of co-operating refining elements intended for a disc refiner Apparatus for refining lignocellulose material is disclosed including two relatively rotatable refining disks separated by a refining gap which includes an inner radial portion and an outer angular portion, with the refiner elements mounted on the outer a... | 09/14/1999 |
| 5932156 | Method for producing lignocellulosic boards Methods for the continuous production of compressed board from lignocellulosic fibrous material are disclosed. The methods include providing the lignocellulosic fibrous material in the form of particles or fibers, drying, gluing and forming the lignocellu... | 08/03/1999 |
| 5925249 | Screening arrangement Apparatus for screening pulp suspensions containing heavy impurities is disclosed including a casing with an inlet for the pulp suspension at the lower end of the casing, a stationary screen mounted within the casing, a rotor mounted for rotation within t... | 07/20/1999 |
| 5917166 | Method of washing sawdust and arrangement for carrying out the method Methods for washing sawdust are disclosed which include providing a mixture of sawdust and water to a vessel, subjecting the mixture to a reduced pressure so that gases present in the sawdust cause expansion therein and the sawdust rises to the surface of... | 06/29/1999 |
| 5902456 | Dewatering apparatus Apparatus is disclosed for dewatering pulp suspensions including a pair of cylindrical rotatable liquid-premeable press rolls forming a nip therebetween, so that the material suspension can pass between the nip to be dewatered and to form a material web, ... | 05/11/1999 |
| 5899338 | Screening apparatus for separating light impurities from pulp suspensions Apparatus for separating light impurities from a pulp suspension is disclosed. The apparatus includes a housing mounted on a fractionation device and symmetrically disposed with respect to the axis of rotation of the casing of the fractionation device, a ... | 05/04/1999 |
| 5882509 | Chip-washing arrangement Apparatus for treating wash water is disclosed. The apparatus includes a settling tank in which sludge is separated from the wash water, a circulation tank for temporary storage of the clean wash water from the settling tank, and from which the clean wash... | 03/16/1999 |
| 5853534 | Method of producing pulp with high yield using a two-stage refining system operating at different temperatures A method of producing mechanical and chemi-mechanical pulp with a yield above 85 % from lignocellulose-containing material for the manufacture of paper or board products. The material is subjected to mechanical processing in at least two steps. The materi... | 12/29/1998 |
| 5826501 | System at a multi-stage press Apparatus for pressing wet-formed fiber material boards in a multi-stage press is disclosed, including a vertically movable loading elevator with several stages for receiving transport plates for the boards, and a pusher for moving the transport plates fr... | 10/27/1998 |
| 5827400 | Liquid treatment device Apparatus for liquid treatment and dewatering of material suspensions is disclosed including a pair of rotatable liquid permeable press rolls within a vat and in which the vat includes a bottom defining the space directed towards the nip between the press... | 10/27/1998 |
| 5816996 | Method and device for manufacturing wrapping sheets Methods and apparatus for manufacturing wrapping sheets from a pulp web are disclosed. The disclosed method includes drying the pulp web, embossing the dry pulp web by providing a plurality of raised portions on the surface of the dried pulp web, cutting ... | 10/06/1998 |
| 5753830 | Method and system for sampling in a material mixture Methods for sampling mixtures of flowable materials such as pulp streams are disclosed including tapping a minor portion of these mixtures and circulating the tapped portion continuously through a circuit, diluting the circulating tapped mixture to dilute... | 05/19/1998 |
| 5747707 | Measuring device for refiners Refining apparatus is disclosed including a pair of relatively rotatable refining disks including radial refining bars extending along at least part of the refining gap between those disks, and at least one of the refining bars comprising a sensor bar inc... | 05/05/1998 |
| 5746120 | Tying device in which the drive means are electric servomotors Apparatus for tying objects with wire is disclosed including a feeder for feeding and tightening the wire around the object, the feeder being driven by an electric servomotor which can be rotated through a predetermined number of revolutions for feeding a... | 05/05/1998 |
| 5746890 | Device for admixing a processing agent into a pulp suspension Mixing devices for mixing a processing agent with a pulp suspension are disclosed including a mixing vessel, an agitator mounted on the surface of the mixing vessel to create a flow of the pulp suspension across the mixing vessel, a processing agent suppl... | 05/05/1998 |
| 5741398 | Method of removing metal ions dissolved in the bleach plant waste water Methods of treating process water containing metal ions is disclosed including contacting the process water with a pulp comprising lignocellulose-containing material at a pH of above about 7 and a temperature of from about 50° to 120° C. whereby at leas... | 04/21/1998 |
| 5725783 | Concentrating method and means therefor Methods and apparatus for concentrating a liquid suspension of solid particles are disclosed including providing a screening web moving in an endless path, folding the screening web into a tubular configuration at a first location along that path, unfoldi... | 03/10/1998 |
| 5711972 | Device for board manufacture Apparatus for compressing mats of lignocellulose-containing material into board material is disclosed including a rotary compression roll having a perforated shell on its surface with axial ducts disposed within the rotary compression roll adjacent to tha... | 01/27/1998 |
| 5704559 | Refining element A pair of co-operating refining elements (10, 11) intended for a disc refiner with two opposed refining discs, one of which is stationary (stator) and the other one is rotary (rotor), for the working of lignocellulosic fiber material in a refining gap (12... | 01/06/1998 |
| 5700086 | Mixing device with axially movable shaft for maintenance purposes Apparatus for mixing a processing medium with a pulp suspension within a vessel is disclosed, including a housing attached to a wall of the vessel, a rotary shaft extending into the vessel through an opening in the housing, bearings supporting the rotary ... | 12/23/1997 |
| 5695136 | Refining element Apparatus for refining lignocellulose-containing material is disclosed including a pair of opposed refining disks defining a refining gap for the lignocellulose-containing material, at least one of the refining disks including an outer refining zone secti... | 12/09/1997 |
| 5683048 | Refining elements Refining elements for use in a disk refiner for disintegrating and refining lignocellulose-containing material is disclosed including a pair of opposed refining elements on opposed refining disks which are relatively rotatable with respect to each other, ... | 11/04/1997 |
| 5679250 | Pressurized screen arrangement A pressurized screen arrangement for screening lignocellulose containing fiber material, comprising a screen housing (10) with a screen cage (11) are arranged in first and, respectively, second attachment members (17, 18) in the screen housing. Both ends ... | 10/21/1997 |
| 5658407 | Method and apparatus for pre-pressing fibrous materials during the manufacture of fiberboard materials A method for pre-pressing webs of lignocellulose-containing fibrous material is disclosed including forming the predetermined density, further compressing the mat without the addition of heat to a density approximating that of the predetermined density, a... | 08/19/1997 |
| 5589035 | Liquid treatment device Apparatus for liquid treatment and dewatering of material suspensions is disclosed including a pair of rotatable liquid permeable press rolls within a vat and in which the vat includes a bottom defining the space directed towards the nip between the press... | 12/31/1996 |
| 5589031 | Chlorine dioxide bleaching of chemical pulp A method of bleaching chemical pulp in a sequence comprising at least four bleaching steps with final bleaching in a first and a second chlorine dioxide step. Between the chlorine dioxide steps an alkaline extraction is carried out, and washing takes plac... | 12/31/1996 |
| 5571383 | Method and device for transverse distribution of a flowing medium Methods and apparatus are disclosed for uniformly distributing a flowing medium flowing in a first direction in a conduit onto a surface so as to form a uniformly distributed medium thereon having a width greater than that of the conduit, the method inclu... | 11/05/1996 |
| 5526992 | Refining element of a disc refiner A refining element is disclosed for use in a disk refiner having a refining element holder surface including a plurality of attachment holes, the refining element including a plurality of working members on its front surface and a rear surface adapted to ... | 06/18/1996 |
| 5505540 | Device for admixing a processing agent to a pulp suspension Apparatus for mixing a processing medium with the pulp suspension within a bin is disclosed, the apparatus including a housing attached to a wall of the bin, a rotary shaft extending through the housing with a propeller attached to the shaft by means of a... | 04/09/1996 |
| 5488900 | Dewatering press Apparatus for dewatering material suspensions is disclosed including a pair of rotatable cylindrical liquid permeable press rolls at least partially immersed in a vat, inlet channels for supplying the material suspension to the bottom portion of the vat, ... | 02/06/1996 |
