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公开(公告)号：EP0920552A1
公开(公告)日：1999-06-09
申请号：EP97935959.0
申请日：1997-08-20
Applicant: STFI
Inventor： NILVEBRANT, Nils-Olov , REIMANN, Anders , DE SOUSA, Filipe
Abstract: One or several oxalic acid or oxalate decomposing enzymes are used to lower the concentration of oxalic acid and/or oxalate precipitates in the production of pulp and paper. The method is particularly useful in processes using oxidative bleaching and in particular in processes where the process liquids are recirculated within the plant. Thus the forming of incrusts and sediments, comprising sparingly soluble oxalate compounds, is reduced or prevented.
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公开(公告)号：EP0500674A1
公开(公告)日：1992-09-02
申请号：EP90916835.0
申请日：1990-11-06
Applicant: STFI
Inventor： ENGSTRAND, Per , HAMMAR, Lars-Ake , SJÖGREN, Birger , SVENSSON, Börje , HTUN, Myat
Abstract: On produit de la pâte de cellulose mécanique et chimico-mécanique, notamment de la pâte à papier, à une entrée de faible énergie, par désintégration et trituration de matière ligneuse en une ou en plusieurs étapes. Selon l'invention, on ajoute une substance capable de former des complexes avec des ions métal polyvalents, notamment des ions calcium, appelée agent de transformation en complexe, à la matière ligneuse, avant le procédé de trituration, afin de remplacer lesdits ions calcium ou autre métal singulier polyvalent par des ions sodium, ce qui permet de réduire davantage l'entrée d'énergie.
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公开(公告)号：EP1451405B1
公开(公告)日：2013-10-23
申请号：EP02791134.6
申请日：2002-11-22
Inventor： BRELID, Harald , AXEGARD, Peter
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公开(公告)号：EP2162750B1
公开(公告)日：2013-04-10
申请号：EP08767272.1
申请日：2008-06-30
Inventor： SÖDERBERG, Daniel
CPC classification number: D21G9/0027 , G01P3/806 , G01P13/02 , G01S11/12
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公开(公告)号：EP1240389B1
公开(公告)日：2010-06-02
申请号：EP00966646.2
申请日：2000-09-20
Applicant: STFI
Inventor： LINDSTRÖM, Tom , GLAD-NORDMARK, Gunborg , RISINGER, Gunnel , LAINE, Janne
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Patent Agency Ranking
公开(公告)号：EP1853760A1
公开(公告)日：2007-11-14
申请号：EP06716944.1
申请日：2006-02-27
Applicant: STFI-Packforsk AB
Inventor： NORMAN, Bo , HERMANSSON, Lennart
Abstract: Dewatering arrangement adapted to use in a twin-wire dewatering section of a paper machine, comprising a rotating forming roll, a head box for supplying stock arranged before the forming roll, a closed loop first wire adapted to, be partly wrapped around the forming roll to a separation line where its contact with the forming roll ceases, and to receive the stock from the head box on its surface not facing the forming roll, a closed loop second wire adapted to be partly wrapped around the forming roll on top of the first wire thereby pressing the stock between itself and the first wire, a first blade, substantially parallel with the forming roll, is arranged to support the lower side of the wire after the separation line of the forming roll and is arranged such that the tip of the blade is directed against the wire transporting direction, The distance from the separation line to the blade is less than 100 mm. By supporting the wire close to the forming roll movement of the first wire is suppressed, thus reducing unwanted effects like sheet damages.
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公开(公告)号：EP1451407B1
公开(公告)日：2007-05-02
申请号：EP02780249.5
申请日：2002-12-03
Inventor： SÖDERBERG, Daniel
Abstract: The present invention relates to a method of forming a layered fibrous web, comprising leading at least two different fibre suspensions through a head box (10), separating the fibre suspensions from each other by a blade means (18, 180), supplying the fibre suspensions to a web forming device (24) and forming a water layer having a transversely uniform flow at an outlet at the end of the blade means (18, 180), such that the water layer constitutes an extension of the blade means and thereby prevents mixing of the fibre suspensions. The method comprises arranging the blade means (18, 180) to be freely movable in a substantially vertical direction in order to permit an equalization of pressure between the fibre suspension layers separated by the blade means and thereby reducing wake effects downstream the edge of the blade means. The invention furthermore relates to a paper machine for carrying out said method.
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公开(公告)号：EP1759058A1
公开(公告)日：2007-03-07
申请号：EP05752539.6
申请日：2005-06-16
Applicant: STFI-Packforsk AB
Inventor： GLAD-NORDMARK, Gunborg , LINDSTRÖM, Tom
Abstract: The present invention provides, according to a first aspect a method for manufacturing paper or paperboard, wherein the a) the pulp is treated with CMC or a derivative thereof or an amphoteric CMC derivative, thereby forming a stock , b) filler/pigment is treated with a cationically active polymer with an addition of approximately from 0.015 % to 1.5 %, preferably from 0.03 % to 0.6 %, most preferred approximately 0.3 % ; and c) the thus treated filler/pigment is added to the stock, comprising at least 10 treated fibres (may be up to 100%) according to step a). The present invention also provides, according to a second aspect, paper or paperboard obtainable by the above method according to the first aspect. According to a third aspect of the invention, use of paper or paper board according to the second aspect of the invention for the manufacture of liquid board, communication paper, packaging paper, liner or board is provided.
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公开(公告)号：EP1451405A1
公开(公告)日：2004-09-01
申请号：EP02791134.6
申请日：2002-11-22
Inventor： BRELID, Harald , AXEGARD, Peter
Abstract: In a process of treating wood chips for reduction of the concentration of undesirable inorganic elements prior to cooking in a production line for chemical pulp, the wood chips, having entrapped air, are treated with an aqueous leaching liquor at elevated temperature and pressure, followed by draining at atmospheric pressure or below atmospheric pressure, the pressures being controlled to yield a moisture content in the wood chips as low as possible for adequate leaching result and behavior of the chips in a subsequent digester. The aqueous leaching liquor is e.g. pulp mill process water with a low content of undesirable inorganic components, such as bleach plant spent liquor or condensate. The aqueous leaching liquor drained from the treated wood chips may be purified and recycled back to the process.
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公开(公告)号：EP1240389A1
公开(公告)日：2002-09-18
申请号：EP00966646.2
申请日：2000-09-20
Applicant: STFI
Inventor： LINDSTRÖM, Tom , GLAD-NORDMARK, Gunborg , RISINGER, Gunnel , LAINE, Janne
Abstract: A method for modifying cellulose fibers; which are treated for at least 5 minutes with an aqueous solution of CMC or CMC-derivative containing electrolyte at a temperature of at least approximately 100 °C, and the pH during the treatment is approximately 1.5-4.5, or higher than 11; or the concentration of electrolyte is approximately 0.001 - 0.5 M, if the electrolyte has monovalent cations, or approximately 0.0002 - 0.5 M, if the electrolyte has divalent cations, and cellulose fibers that have been modified according to this method, and use of the modified cellulose fibers for the manufacture of rayon fibers. A method for the manufacture of paper with a high wet strength, whereby an aqueous suspension of cellulose fibers is produced, and the cellulose fibers are modified as described above, and wet-strength agent is added to the aqueous suspension; and paper with a high wet strength manufactured according to this method.
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