Patents by Inventor Mikael Svedman
Mikael Svedman has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 9096692Abstract: The present invention relates to a process for producing microcellulose comprising subjecting fibrous cellulosic material to acid hydrolysis at a temperature of at least 40° C. and at a consistency of at least 8% on dry weight of the cellulose, wherein the amount of added acid is from 0.2 to 2%, preferably from 0.5 to 1.5% on dry weight of the cellulose.Type: GrantFiled: June 7, 2011Date of Patent: August 4, 2015Assignee: AALTO UNIVERSITY FOUNDATIONInventors: Olli Dahl, Kari Vanhatalo, Kari Parviainen, Mikael Svedman
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Patent number: 7731818Abstract: The present invention relates to a process for deinking waste paper comprising treating the waste paper with a peroxide compound in an aqueous alkaline medium in the presence of a first polymer (A) comprising a Ca-binding polymer in the form of a polycarboxylate polymer and a second polymer (B) comprising a poly-alfa-hydroxyacrylic acid or a salt thereof or the corresponding polylactone, said process additionally comprising treating the waste paper with at least one non-ionic surfactant or with at least one combination of a non-ionic surfactant and a fatty acid or a salt thereof to promote ink detachment and/or ink removal.Type: GrantFiled: June 16, 2005Date of Patent: June 8, 2010Assignee: Kemira OyjInventors: Bob Horacek, Jukka Jäkärä, Mikael Svedman
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Patent number: 7384501Abstract: A method for the preparation of pulp by means of alkaline cooking, in which method spent liquor is transferred to pressurized tanks, and at least one liquor is expanded corresponding to a temperature difference of 1 to 5° C. The generated steam is led to turpentine recovery. Thus, the removal of turpentine and gases dissolved in said liquor is effective, the amount of recovered turpentine increases, and pulp of better washability and higher quality is obtained.Type: GrantFiled: December 20, 2000Date of Patent: June 10, 2008Assignee: Metso Paper Pori OyInventors: Päivi Uusitalo, Mikael Svedman, Jukka Vaistomaa, Hannu Haaslahti
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Publication number: 20070246175Abstract: The present invention relates to a process for deinking waste paper comprising treating the waste paper with a peroxide compound in an aqueous alkaline medium in the presence of a first polymer (A) comprising a Ca-binding polymer in the form of a polycarboxylate polymer and a second polymer (B) comprising a poly-alfa-hydroxyacrylic acid or a salt thereof or the corresponding polylactone, said process additionally comprising treating the waste paper with at least one non-ionic surfactant or with at least one combination of a non-ionic surfactant and a fatty acid or a salt thereof to promote ink detachment and/or ink removal.Type: ApplicationFiled: June 16, 2005Publication date: October 25, 2007Applicant: KEMIRA OYJInventors: Bob Horacek, Jukka Jakara, Mikael Svedman
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Publication number: 20070163735Abstract: The present invention concerns a process for reducing the susceptibility of lignocellulosic material to unwanted yellowing, particularly yellowing caused by light and heat. According to the invention, the fibres are activated enzymatically or chemically and then contacted with a modifying agent capable of bonding to the oxidized fibre material, rendering the lignocellulosic fibre material improved resistance to brightness reversion. By means of the invention, brightness reversion caused by light or heat or a combination thereof can be retarded and even stopped.Type: ApplicationFiled: December 23, 2004Publication date: July 19, 2007Applicant: KEMIRA OYJInventors: Johanna Buchert, Liisa Viikari, Stina Gronqvist, Mikael Svedman, Arto Paren, Veli-Matti Vuorenpalo
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Patent number: 7178698Abstract: Containers for collecting and discharging particulate lignocellulosic material are disclosed, including a cylindrical upper portion, a lower portion tapering towards a bottom elongated space, an exit pipe below the bottom, a pair of parallel screws mounted on parallel shafts in the elongated space in a common horizontal plane for feeding the particulate lignocellulosic material towards the exit pipe, a pair of distributors disposed on the parallel screws above the exit pipe comprising radial discs, and a pump below the exit pipe for transporting the particulate lignocellulosic material to a subsequent step.Type: GrantFiled: October 16, 2002Date of Patent: February 20, 2007Assignee: Metso Paper, Inc.Inventors: Kjell Forslund, Mikael Svedman
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Publication number: 20060272786Abstract: The present invention concerns a method and an apparatus for removing gas from comminuted lignocellulose material, wherein material is heated with steam to a degasification temperature and the heated material flow is led as a dense composed bed through a gas removal stage. The material is heated by introducing a steam flow into the material flow in transversal direction with respect to the direction of the material flow.Type: ApplicationFiled: April 28, 2005Publication date: December 7, 2006Applicant: METSO PAPER, INC.Inventors: Mikael Svedman, Arvo Jonkka, Paivi Uusitalo, Hannu Tahkanen, Rami Lampinen
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Publication number: 20060175029Abstract: According to the invention, polysulfide is used in the manufacture of kraft pulp in the initial stage of a displacement batch process in order to improve the yield. Polysulfide-containing white liquor is added inter-mixed with the first liquor charged to the digester, or as a separate charge before the impregnation liquor is introduced. Preferably, a cooking catalyst, e.g. antraquinone, is added to the white liquor charge as the cooking stage commences.Type: ApplicationFiled: December 22, 2004Publication date: August 10, 2006Applicant: Metso Paper Inc.Inventors: Seppo Martikainen, Panu Tikka, Olli Timonen, Mikael Svedman
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Patent number: 6939439Abstract: Methods for producing chemical pulp from lignocellulose-containing material in processes for kraft pulp production are disclosed including charging the lignocellulose-containing material to a digester, initially treating the lignocellulose-containing material with an impregnation liquor, and then treating the impregnated lignocellulose-containing material with hot liquor and displacing calcium-containing spent liquor from the digester during that treatment, heating and cooking the heated lignocellulose-containing material to produce cooked lignocellulose-containing material and cooking liquor and displacing the cooking liquor from the digester using at least a portion of the displaced calcium-containing spent liquor.Type: GrantFiled: October 4, 2000Date of Patent: September 6, 2005Assignee: Metso Chemical Pulping OyInventors: Asko Paakki, Päivi Uusitalo, Mikael Svedman
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Publication number: 20040089430Abstract: A continuous, alkaline process for the production of pulp from wood chips, wherein the preheated chips are subjected to an extended impregnation step for at least 60 min, preferably longer, at a temperature not exceeding the impregnation liquor boiling point at atmospheric conditions, and a rapid heating and cooking period of less than 65 min, preferably shorter, followed by cooling to below reaction temperature. Fresh alkali is added both during impregnation and the heating/cooking period.Type: ApplicationFiled: December 18, 2003Publication date: May 13, 2004Inventors: Thomas Fant, Mikael Svedman, Lari Lammi
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Publication number: 20040089431Abstract: An alkaline batch process for the production of pulp from wood chips, wherein the preheated chips are subjected to an extended impregnation step outside the digester for at least 60 min, preferably longer, at a temperature not exceeding the impregnation liquor boiling point at atmos-pheric conditions, and a rapid heating and cooking period in the digester of less than about 90 min, preferably shorter, followed by cooling to below reaction tempera-ture. Fresh alkali is added both during impregnation and the heating/cooking period.Type: ApplicationFiled: December 29, 2003Publication date: May 13, 2004Inventors: Thomas Fant, Mikael Svedman, Lari Lammi
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Publication number: 20040079498Abstract: This invention refers to a method for producing pulp in an alkaline digesting process comprising the following steps: charging lignocellulosic material to a digester system; pre-treating said lignocellulosic material with an impregnation liquor and subsequently with a hotter liquor containing black liquor, simultaneously displacing spent liquor; heating and cooking said lignocellulosic material to produce cooked lignocellulosic material and cooking liquor; displacing a portion of said cooking liquor at cooking temperature from said digester to a first section by supplying a washing liquid; further displacing a second portion of displaced liquor from said digester system to at least a second section by supplying further washing liquid until the temperature of said second portion of displaced liquor drops to a temperature of at least about the boiling point of said cooking liquor at atmospheric pressure, said second portion of displaced liquor having a dry solids content substantially lower than the initial dryType: ApplicationFiled: October 22, 2003Publication date: April 29, 2004Inventors: Hannu Haaslahti, Olavi Katajisto, Osmo Keitaaniemi, Mikael Svedman
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Patent number: 6719878Abstract: A method for producing chemical pulp from cellulosic material by means of alkaline cooking, including cooking the material to pulp at cooking temperature in a digester, reducing the temperature at the end of the cook, substantially relieving the overpressure in the digester and then discharging the pulp from the digester by means of pumping. The method is characterized in that the pulp is cooled to essentially 85° C. to 70° C. before pumping cooked material as a fluid suspension from the digester, and that the temperature of the cooked material is maintained in the same temperature range and at a pH level being between 10 and 13, between the digester and a first delignification/bleaching stage, thus avoiding mechanical damage of cellulosic material.Type: GrantFiled: February 26, 2002Date of Patent: April 13, 2004Assignee: Metso Chemical Pulping OyInventor: Mikael Svedman
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Publication number: 20030164227Abstract: A method for the preparation of pulp by means of alkaline cooking, in which method spent liquor is transferred to pressurized tanks, and at least one liquor is expanded corresponding to a temperature difference of 1 to 5° C. The generated steam is led to turpentine recovery. Thus, the removal of turpentine and gases dissolved in said liquor is effective, the amount of recovered turpentine increases, and pulp of better washability and higher quality is obtained.Type: ApplicationFiled: October 29, 2002Publication date: September 4, 2003Inventors: Paivi Uusitalo, Mikael Svedman, Jukka Vaistomaa, Hannu Haaslahti
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Patent number: 6533896Abstract: A method for preparing pulp from lignin-containing cellulosic material is disclosed, including a step for acid cleaning of the lignocellulosic material, followed by alkaline delignification. The acidic step removes undesired components such as metal ions and side groups of polysaccharides, which may have adverse effects on the process especially when extensive recycling of liquors is employed within the plant.Type: GrantFiled: June 8, 2000Date of Patent: March 18, 2003Assignee: Metso Chemical Pulping OyInventors: Panu Tikka, Mikael Svedman, Thomas Fant
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Patent number: 6413367Abstract: A process for the production of pulp using alkaline delignification is disclosed, wherein cellulosic material is initially treated with steam, and a chelating agent is added in connection with the steam treatment. The end pH of the steam treatment stage is below 5. Liquors containing chelated, so-called non-process compounds are not recycled in the pulping process, but expelled therefrom for further processing where non-process compounds are eliminated.Type: GrantFiled: August 3, 2001Date of Patent: July 2, 2002Assignee: Valmet Chemical Pulping OYInventors: Mikael Svedman, Thomas Fant, Seppo Martikainen