With Chlorine, Chlorine Compounds, Oxygen, Ozone, Or Per-compounds Patents (Class 162/6)
  • Patent number: 10260199
    Abstract: Pulp fiber containing little ash is effectively recovered from a used sanitary product containing the pulp fiber and a polymer absorbent. The method according to the present invention comprises: a step for treating the used sanitary product with an ozone-containing gas and thus decomposing and removing at least a portion of the polymer absorbent in the used sanitary product; and a step for stirring the used sanitary product, that has been treated with the ozone-containing gas, in water or an aqueous solution containing an antiseptic and thus decomposing the used sanitary product into constituents. If required, the method may further comprise a step for separating the pulp fiber from the decomposition product obtained by the decomposition step.
    Type: Grant
    Filed: August 7, 2015
    Date of Patent: April 16, 2019
    Assignee: Unicharm Corporation
    Inventors: Takayoshi Konishi, Toshio Hiraoka, Noritomo Kameda, Hideaki Ichiura, Hiroko Nakaoka
  • Patent number: 9894955
    Abstract: Provided is a shoe that includes: a bottom surface that is adjacent to the ground in normal use; a sole that forms at least a portion of the bottom surface; an upper portion extending above the sole; and individual particles bonded to the bottom surface of the shoe. The individual particles include at least one of corn husk, hemp or a natural plant material that has been ground into the individual particles.
    Type: Grant
    Filed: December 2, 2013
    Date of Patent: February 20, 2018
    Assignee: Dynasty Footwear, Ltd.
    Inventors: John C. S. Koo, Jonathan Goldberg, Anthony Cox
  • Patent number: 8961739
    Abstract: A method of splitting hollow cellulosic fibers employs the steps of wetting the fibers, feeding the wet fibers to a gaseous flow, and conducting the gaseous flow carrying the fibers through a venturi tube, the pressure drop in the venturi tube throat bringing a pressure difference between liquid inside the fibers and gas outside of the fibers and causing the fibers to split in their longitudinal direction, to open the lumen inside the fibers.
    Type: Grant
    Filed: December 16, 2011
    Date of Patent: February 24, 2015
    Inventor: Reijo K. Salminen
  • Patent number: 8784606
    Abstract: The invention relates to a method for reducing the negative effects of adhesive contaminants in the processing of waste paper, wherein an aqueous polymer dispersion comprising one component A and one component B for coagulation and detackification of stickies is added during the processing of waste paper, wherein component A is a homo- and/or copolymer of methyl methacrylate, acrylate and/or styrene and component B is a styrene copolymer having acrylic acid, maleimide and/or maleic acid hydride. The polymer dispersion can optionally comprise another component C, a cationic fixing agent that supports the coagulation of the stickies.
    Type: Grant
    Filed: July 27, 2010
    Date of Patent: July 22, 2014
    Assignee: Clariant Finance (BVI) Limited
    Inventors: Achim Kohler, John Stuart Cowman, Damien Corpet, Antonella Leone-Kammler
  • Patent number: 8715462
    Abstract: Methods and apparatus are provided for exploiting coated paper products such as coated paper cups. End products include biofuels that have a high energy density. The biofuels may be mixed with coal or other fuels and have good binding characteristics. In some embodiments, useful chemicals such as HMF are produced. The methods involve heat treatment at relatively mild temperatures and pressures under acidic conditions.
    Type: Grant
    Filed: April 30, 2010
    Date of Patent: May 6, 2014
    Inventor: Alexis Fosse Mackintosh
  • Patent number: 8287690
    Abstract: The present invention provides methods for deinking printed waster paper—particularly methods that use a deinking composition that includes a hydrophobically-modified inorganic particle (“MIP”) to improve ink collection efficiency under traditional alkaline, reduced alkali, and true neutral deinking conditions. Deinking compositions are provided that include a hydrophobically-MIP substrate, a nonionic surfactant, and a fatty acid, or mixtures thereof. The improved ink collection of the present invention can result in deinked pulp of high quality and/or yields that has excellent brightness and effective residual ink concentrations (“ERIC”) values.
    Type: Grant
    Filed: January 18, 2011
    Date of Patent: October 16, 2012
    Assignee: Kemira Chemicals, Inc.
    Inventors: Scott Rosencrance, Charles M. Ngome, Kevin M. Hale
  • Patent number: 8246778
    Abstract: A method is described controlling enzymatic decomposition of peroxide comprising contacting a composition containing a peroxide decomposing enzyme with an aldehyde functional polymer added in an amount effective to control the enzyme. There also is a method described for bleaching cellulose pulp, such as recycled paper pulp or other pulps, with an aldehyde functional polymer introduced in an amount effective to control peroxide decomposing enzymes present in the pulp being bleached. Paper products containing the aldehyde functional polymer used to control peroxide decomposing enzymes in a bleaching treatment of cellulose pulp are also provided.
    Type: Grant
    Filed: November 19, 2009
    Date of Patent: August 21, 2012
    Assignee: Buckman Laboratories International, Inc.
    Inventors: Chen Lu, Janet Woodward
  • Publication number: 20120048491
    Abstract: Methods and apparatus are provided for exploiting coated paper products such as coated paper cups. End products include biofuels that have a high energy density. The biofuels may be mixed with coal or other fuels and have good binding characteristics. In some embodiments, useful chemicals such as HMF are produced. The methods involve heat treatment at relatively mild temperatures and pressures under acidic conditions.
    Type: Application
    Filed: April 30, 2010
    Publication date: March 1, 2012
    Applicant: EVE RESEARCH INC.
    Inventor: Alexis Fosse Mackintosh
  • Patent number: 7927496
    Abstract: There is provided a method of inhibiting the development of a biofilm adjacent a surface, the method comprising intermittently applying a biofilm inhibiting substance to a collection of microorganisms having biofilm developing potential. Other embodiments are also described.
    Type: Grant
    Filed: October 28, 2009
    Date of Patent: April 19, 2011
    Assignee: A.Y. Laboratories Ltd.
    Inventor: Ayala Barak
  • Patent number: 7897010
    Abstract: The present invention provides methods for deinking printed waste paper—particularly methods that use a deinking composition that includes a hydrophobically-modified inorganic particle (“MIP”) to improve ink collection efficiency under traditional alkaline, reduced alkali, and true neutral deinking conditions. Deinking compositions are provided that include a hydrophobically-MIP substrate, a nonionic surfactant, and a fatty acid, or mixtures thereof. The improved ink collection of the present invention can result in deinked pulp of high quality and/or yields that has excellent brightness and effective residual ink concentrations (“ERIC”) values.
    Type: Grant
    Filed: January 8, 2007
    Date of Patent: March 1, 2011
    Assignee: Kemira Chemicals, Inc.
    Inventors: Scott Rosencrance, Charles M. Ngome, Kevin M. Hale
  • Patent number: 7867357
    Abstract: The present invention relates to a polymer composition for peroxide bleaching of a cellulosic fiber material, said composition being in the form of a stable aqueous polymer solution obtained by bringing in an aqueous medium a first polymer (A) comprising a partly or totally acidic homopolymer of acrylic acid, methacrylic acid or maleic acid, or a copolymer of acrylic acid and/or methacrylic acid with an unsaturated dicarboxylic acid, into contact with a second polymer (B) comprising a polylactone of a poly-alfa-hydroxyacrylic acid in solid form or as a moist powder or as a slurry, said polymer solution having a pH of at most 5. The invention also relates to peroxide bleaching processes.
    Type: Grant
    Filed: January 4, 2010
    Date of Patent: January 11, 2011
    Assignee: Kemira Oyj
    Inventors: Jonni Ahlgren, Aarto Parén, Jukka Jäkärä, Timo Härmä, Ilkka Renvall
  • Patent number: 7862685
    Abstract: The present invention provides methods for deinking printed waste paper—particularly methods that use a deinking composition that includes a hydrophobically-modified inorganic particle (“MIP”) to improve ink collection efficiency under traditional alkaline, reduced alkali, and true neutral deinking conditions. Deinking compositions are provided that include a hydrophobically-MIP substrate, a nonionic surfactant, and a fatty acid, or mixtures thereof. The improved ink collection of the present invention can result in deinked pulp of high quality and/or yields that has excellent brightness and effective residual ink concentrations (“ERIC”) values.
    Type: Grant
    Filed: January 9, 2006
    Date of Patent: January 4, 2011
    Assignee: Kemira Chemicals, Inc.
    Inventors: Scott Rosencrance, Charles Ngome, Kevin M. Hale
  • Patent number: 7754048
    Abstract: The present invention relates to a process for bleaching a cellulosic fibre material with a peroxide compound in an aqueous alkaline medium, comprising a bleaching step wherein: a) a first polymer (A) comprising a homopolymer of acrylic acid, methacrylic acid or maleic acid, or a copolymer of acrylic acid and/or methacrylic acid with an unsaturated dicarboxylic acid, and a solution of a second polymer (B) comprising a poly-alpha-hydroxyacrylic acid or a salt thereof, are added to a cellulosic fibre material, and b) thereafter adding a peroxide compound and an alkaline substance and carrying out the bleaching.
    Type: Grant
    Filed: January 9, 2004
    Date of Patent: July 13, 2010
    Assignee: Kemira Oyj
    Inventors: Aarto Paren, Jukka Jäkärä, Ilkka Renvall, Jonni Ahlgren, Riitta Laitinen, Jussi Nikkarinen, Tapio Viitanen
  • Patent number: 7731818
    Abstract: 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: Grant
    Filed: June 16, 2005
    Date of Patent: June 8, 2010
    Assignee: Kemira Oyj
    Inventors: Bob Horacek, Jukka Jäkärä, Mikael Svedman
  • Patent number: 7582213
    Abstract: The present invention comprises an improved method for refining cellulose that produces a highly refined cellulosic material. The method comprises soaking raw material in a mild NaOH using reduced temperatures and pressures, and refining the material with a plate refiner so that a waste water stream is reduced in volume and has a pH within a range of 8 to 9. The present invention also comprises a HRC gel having a lignin concentration of at least about one (1)% by weight, and a water retention capacity of about 25 to at least about 56 g H2O/g dry HRC.
    Type: Grant
    Filed: May 16, 2006
    Date of Patent: September 1, 2009
    Assignees: Regents of the University of Minnesota, Agricultural Utilization Research Institute
    Inventors: Brock Lundberg, Lin Gu, Rongsheng Roger Ruan, Ling Chen, Paul Bradley Addis, Jack Edgar Johnson
  • Patent number: 7544271
    Abstract: Disclosed is an open flotation de-inking module for recycled paper comprised of a flotation cell having an injector module and air control module used in conjunction to infuse micro air bubbles into pulp slurry to optimize the process of separating ink, clay, stickies and other float able contaminants from the recycled pulp slurry by negatively pressurizing the slurry as it accelerates through the injector drawing air from the air control module saturating the slurry with air bubbles before injection into the flotation cell whereupon the contaminants will adhere to the bubbles as they move to the surface forming a foam that is passively skimmed into reject compartments with the decontaminated pulp channeled from the floatation cell for further processing.
    Type: Grant
    Filed: June 12, 2006
    Date of Patent: June 9, 2009
    Inventor: Narayanasamy Seenivasan
  • Publication number: 20090050281
    Abstract: This invention relates to an improved smudge free sanitary sheet made of waste paper and a process of preparing the same through processing the surplus newsprint and more precisely processing used/recycled paper. The sanitary sheets are prepared by the process steps of collecting pre-consumer overprint or post consumer read newspapers; grading the collected waste newspaper; drying and sterilizing the graded newspaper by applying ultraviolet, infrared and/or gamma rays; trimming and cutting the dried sterilized sheets in appropriate sizes; applying on at least one of the sides of the waste newspaper an aqueous coating comprising of a mixture of resin such as bleached shellac, a dye, a germicide such as Benzaikonium Chloride (BC) and/or PCMX (Chloroxylenol), a safe colour, a known deodorant and optionally cosmetic chemicals such as emollient and a foaming agent such as a detergent.
    Type: Application
    Filed: November 28, 2005
    Publication date: February 26, 2009
    Inventor: Sanjiv Agarwal
  • Patent number: 7377993
    Abstract: Methods for reducing, and in some cases eliminating, fluorescence in pulp and paper, as well as the resulting articles, are provided. The methods destroy fluorescent activity of agents (e.g., whitening agents) which may be present in the pulp during processing. The methods are particularly applicable to recycling processes that use paper that includes fluorescent whitening agents. The methods may be used to produce recycled pulp and paper that, for example, may be suitably used in food grade applications which require no, or minimal, amount of fluorescence. In some cases, the methods also advantageously enable production of recycled pulp and paper that has reduced amounts of phosphorescence.
    Type: Grant
    Filed: March 3, 2004
    Date of Patent: May 27, 2008
    Inventor: Tanya Smith Richardson
  • Patent number: 7189329
    Abstract: There is provided a method of inhibiting the development of a biofilm adjacent a surface, the method comprising intermittently applying a biofilm inhibiting substance to a collection of microorganisms having biofilm developing potential. Other embodiments are also described.
    Type: Grant
    Filed: February 21, 2006
    Date of Patent: March 13, 2007
    Assignee: A.Y. Laboratories Ltd.
    Inventor: Ayala Barak
  • Patent number: 6923887
    Abstract: Disclosed is a method for pulp bleaching. The method comprises the steps of providing a pulp sample for bleaching, the pulp sample stemming from a pulp producing process, providing a bleaching liquor comprising water and an organic component as solvent components constituting a bleaching medium, dissolved within are at least a bleaching agent, and a basic agent; and subjecting the pulp sample to the bleaching liquor for a predefined amount of time at predefined bleaching conditions. A preferred bleaching agent is hydrogen peroxide. The organic component amounts to at least 5% in weight of the bleaching medium.
    Type: Grant
    Filed: February 21, 2003
    Date of Patent: August 2, 2005
    Assignee: Alberta Research Council Inc.
    Inventor: George Pan
  • Patent number: 6899790
    Abstract: A process for producing high bulk cellulosic fiber exhibiting a durable elevated curl index includes: (a) concurrently heat treating and convolving cellulosic fiber pulp at elevated temperature and pressure at high consistency under conditions selected so as to preclude substantial fibrillation and attendant paper strength and fiber bonding development; and (b) recovering the pulp wherein the length weighted curl index of the treated fiber is at least about 20% higher than the length weighted curl index of the fiber prior to the heat treatment and convolving thereof. The curl imparted to the fiber persists upon treatment for 30 minutes in a laboratory disintegrator at 3000 rpm at 1% consistency at a temperature of 125° F. Moreover, the curl may be imparted to the fiber in a disk refiner at very short residence times, on the order of several seconds or less. In general, the process is carried out in the presence of saturated steam at a pressure of from about 5 to about 150 psig.
    Type: Grant
    Filed: February 27, 2001
    Date of Patent: May 31, 2005
    Assignee: Georgia-Pacific Corporation
    Inventor: Jeffrey A. Lee
  • Publication number: 20040163779
    Abstract: Disclosed is a method for pulp bleaching. The method comprises the steps of providing a pulp sample for bleaching, the pulp sample stemming from a pulp producing process, providing a bleaching liquor comprising water and an organic component as solvent components constituting a bleaching medium, dissolved within are at least a bleaching agent, and a basic agent; and subjecting the pulp sample to the bleaching liquor for a predefined amount of time at predefined bleaching conditions. A preferred bleaching agent is hydrogen peroxide. The organic component amounts to at least 5% in weight of the bleaching medium.
    Type: Application
    Filed: February 21, 2003
    Publication date: August 26, 2004
    Inventor: George Pan
  • Publication number: 20040079497
    Abstract: A method of processing papermaking fiber includes characterizing the initial color of the pulp and the color of the pulp after treatment with a phloroglucinol stain. The color response of the pulp to the stain has been found to be a better indicator of processing needs for secondary pulps in particular and in any event is selective for untreated groundwood as opposed to conventional groundwood identification methods. The color difference is used to target a suitable product for the pulp, to aid in bleaching/deinking strategy or to enable optimization of fiber blending for particular products. In a preferred embodiment the process includes determining changes in CIE L*, a*, b* and brightness values before and after staining of the pulp.
    Type: Application
    Filed: April 29, 2003
    Publication date: April 29, 2004
    Inventors: Henry Chou, Hazen C. Thomas, Andrew C. Palm, Terry P. Witkowski, Robert J. Clausing, Stephanie Keen, David J. DiPietro
  • Publication number: 20040016522
    Abstract: In the production of pulp and paper from starch-containing paper, the deinking effect can be improved by including treatment with both a starch-degrading enzyme and a pectate lyase. The process comprises enzyme treatment during or after disintegration of the paper to produce pulp, followed by separation of ink particles.
    Type: Application
    Filed: April 14, 2003
    Publication date: January 29, 2004
    Applicant: Novozymes North America, Inc.
    Inventors: Neal Franks, Kelly Page
  • Publication number: 20030155086
    Abstract: The invention relates to improvements in the bleaching of a lignocellulosic pulp by adding carbon dioxide to provide a beneficial pH profile in the chlorine dioxide bleaching or delignification. The resulting bleached pulp is used in the production of paper or pulp. The invention also relates to the use of carbon dioxide for providing a desired pH profile in a chlorine dioxide bleaching stage.
    Type: Application
    Filed: March 3, 2003
    Publication date: August 21, 2003
    Inventors: Krister Sjoblom, Malena Rennel
  • Publication number: 20020179262
    Abstract: The present invention is a method of stabilizing hydrogen peroxide in an aqueous solution, such as a circulating water slurry, comprising a peroxide, such as hydrogen peroxide. The aqueous solution may include organic matter. The method comprises adding an aldehyde donor, such as a methylolhydantoin, to the solution (or slurry). The inventors have discovered that aldehyde donors significantly reduce the decomposition of hydrogen peroxide by catalase and other peroxide decomposing enzymes, which are often present in recycled paper. As a result, less hydrogen peroxide needs to be added to a solution to effectively bleach organic matter in the solution. Furthermore, aldehyde donors are safe to handle and cost effective. Another embodiment is a method of bleaching recycled papers in a circulating water slurry comprising organic matter. The method comprises adding hydrogen peroxide and an aldehyde donor to the slurry.
    Type: Application
    Filed: April 12, 2002
    Publication date: December 5, 2002
    Applicant: Lonza, Inc.
    Inventors: Bill Ney, Richard Sinden, Philip Gerdon Sweeny, Patrick Jay Lutz, Olga Borokhov
  • Patent number: 6482292
    Abstract: Provided herein are compositions of matter useful in de-inking secondary fibers. A composition according to the invention includes an aqueous solution of an anionic form of a styrene-methacrylic acid copolymer. When a surfactant is used in combination with the copolymers herein described in a de-inking operation, a synergy is observed in that the combination of copolymer and surfactant combination together yield a recycled fiber product having higher brightness level and a lower effective residual ink concentration than recycled fibers produced using either the copolymer or surfactant alone in the same operation.
    Type: Grant
    Filed: June 6, 2002
    Date of Patent: November 19, 2002
    Assignee: Huntsman Petrochemical Corporation
    Inventors: Duy T. Nguyen, Charles W. Hengst
  • Patent number: 6458240
    Abstract: An improved process for the separation of cellulosic fiber from difficult to process coated and inked paper products is disclosed and claimed. This process readily separates the paper pulp fraction substantially free of contaminants from such waste paper products as single and two side polymeric coated board having wet strength resin, single and two side polymeric coated board having no wet strength resin, single and two-sided glossy printer trimmings, ultraviolet (UV) cured ink coated stocks, and mixtures thereof. Preferred embodiments include a process in an inclined pressure vessel equipped with agitating and rotating means operative to reflux the waste material with respect to the inclined axis of the vessel in the presence of steam and chemical aids for a sufficient period of time so as to bring about repulping and separation of the paper fiber fraction and formation of a contaminant-collecting polymer phase.
    Type: Grant
    Filed: January 4, 2001
    Date of Patent: October 1, 2002
    Assignee: Georgia-Pacific Corporation
    Inventors: Michael P. Bouchette, Wayne F. Winkler, Hazen C. Thomas
  • Patent number: 6432262
    Abstract: A method of stabilizing hydrogen peroxide in an aqueous solution, such as a circulating water slurry, comprising a peroxide, such as hydrogen peroxide. The aqueous solution may include organic matter. The method comprises adding an aldehyde donor, such as a methylolhydantoin, to the solution (or slurry). The inventors have discovered that aldehyde donors significantly reduce the decomposition of hydrogen peroxide by catalase and other peroxide decomposing enzymes, which are often present in recycled paper. As a result, less hydrogen peroxide needs to be added to a solution to effectively bleach organic matter in the solution. Furthermore, aldehyde donors are safe to handle and cost effective. Another embodiment is a method of bleaching recycled papers in a circulating water slurry comprising organic matter. The method comprises adding hydrogen peroxide and an aldehyde donor to the slurry.
    Type: Grant
    Filed: June 8, 2001
    Date of Patent: August 13, 2002
    Assignee: Lonza, Inc.
    Inventors: Bill Ney, Richard Sinden, Philip Gerdon Sweeny, Patrick Jay Lutz, Olga Borokhov
  • Patent number: 6432263
    Abstract: Process for increasing the water retaining ability of fibrous paper stocks. The process includes knead dispersing a fibrous paper stock having a stock concentration of at least about 20% and a temperature greater than about 45° C. A treatment for the knead dispersing is at least about 10 seconds. The process further includes completing a post-treatment phase to a machine tub of a paper machine in a reaction time of no longer than about 30 minutes.
    Type: Grant
    Filed: December 1, 2000
    Date of Patent: August 13, 2002
    Assignee: Voith Paper Patent GmbH
    Inventors: Volker Gehr, Almut Kriebel, Volker Niggl, Hans-Ludwig Schubert
  • Patent number: 6419786
    Abstract: A method of treating wood-fiber pump, particularly wood-fiber pulp that contains recycled paper, comprises delivering the pulp to and advancing the pulp in a heating zone while delivering steam to the heating zone. The pulp is finely-divided in a disperser and the finely-divided pulp delivered to a screw press without separate departure of steam, so as to compact the pulp in the end of the screw press and therewith form a plug seal. At the same time, one or more bleaching chemicals is or are supplied during one or more treatment stages, and the temperature of the pulp is regulated to obtain an optimal bleaching process or optimal bleaching processes. The temperature of the pulp can be raised or lowered by supplying steam or water thereto respectively. The invention also relates to a plant for carrying out the method.
    Type: Grant
    Filed: April 12, 1999
    Date of Patent: July 16, 2002
    Assignee: Cellwood Machinery AB
    Inventor: Rolf Kurtz
  • Patent number: 6387211
    Abstract: The present invention provides methods for reducing fluorescence in a paper-containing sample. Methods for destroying fluorescent whitening agents in a paper-containing sample are also provided.
    Type: Grant
    Filed: June 25, 2001
    Date of Patent: May 14, 2002
    Assignee: Institute of Paper Science and Technology, Inc.
    Inventors: Fadi Selim Chakar, Arthur Jonas Ragauskas
  • Patent number: 6319356
    Abstract: A method of inhibiting the autooxidation of fatty acids in a paper product made from pulp fiber is accomplished by adding to the pulp fiber between about 1 mole/metric ton and about 25 moles/metric ton, preferably between about 2 moles/metric ton and about 10 moles/metric ton of an oxidizing halogen.
    Type: Grant
    Filed: May 12, 1999
    Date of Patent: November 20, 2001
    Assignee: Great Lakes Chemical Corporation
    Inventors: Frank Durkes, Walter Dubach
  • Patent number: 6294047
    Abstract: The present invention provides methods for reducing fluorescence in a paper-containing sample. Methods for destroying fluorescent whitening agents in a paper-containing sample are also provided.
    Type: Grant
    Filed: July 30, 1999
    Date of Patent: September 25, 2001
    Assignees: Institute of Paper, Science Technology, Inc.
    Inventors: Fadi Selim Chakar, Arthur Jonas Ragauskas
  • Patent number: 6251220
    Abstract: A deinking method comprising the steps of liberating ink from waste paper as a raw material and removing the liberated ink from a flotation system, wherein a nonionic surfactant, e.g., a reaction product obtained by adding an alkylene oxide to a mixture of an oil & fat and an alcohol, an alkylene oxide adduct of a fatty acid, or an alkylene oxide adduct of a higher alcohol, is used for the liberation of ink, and the flotation step is effected in the presence of a cationic compound, an amine, an acid salt of an amine or an amphoteric compound at a pH of from 4 to 9, provides a high quality deinked pulp having a high whiteness and a little residual ink spots.
    Type: Grant
    Filed: August 26, 1997
    Date of Patent: June 26, 2001
    Assignee: Kao Corporation
    Inventors: Yuichi Irinatsu, Yoshitaka Miyauchi, Hiromichi Takahashi
  • Patent number: 6241849
    Abstract: The present invention relates to methods for deinking and decolorizing a printed paper, comprising: (a) pulping the printed paper to obtain a pulp slurry; (b) dislodging an ink from the pulp slurry with one or more enzymes; (c) decolorizing the dye contained in the pulp slurry with one or more laccases in the presence of oxygen and optionally one or more chemical mediators; (d) separating the released ink from the pulp slurry; and (e) recovering the decolorized pulp. The present invention also relates to decolorized pulps prepared by such methods and to methods for producing recycled paper.
    Type: Grant
    Filed: September 16, 1999
    Date of Patent: June 5, 2001
    Assignee: Novo Nordisk Biochem North America, Inc.
    Inventor: Neal E. Franks
  • Patent number: 6217706
    Abstract: A method of de-inking cellulosic fibrous materials comprising: a. admixing an alkaline reagent selected from the group consisting of ammonium hydroxide and hydrogen peroxide and mixtures thereof with an aqueous suspension of inked cellulosic fibrous material such that they react at the ink particle/cellulosic fiber interfaces to dislodge ink particles from the cellulosic materials; and b. removing the dislodged ink particles from the aqueous suspension.
    Type: Grant
    Filed: October 28, 1999
    Date of Patent: April 17, 2001
    Assignee: University of Florida
    Inventors: Hassan El-Shall, Brij M. Moudgil
  • Patent number: 6179957
    Abstract: In a deinking process at least comprising the step of stripping ink from wastepaper as the starting material and the step of removing the stripped ink from a flotation system, the contact angle of the aqueous solution portion of a slurry containing the stripped ink with the interfaces of ink particles in the flotation step is controlled to be at least 70°.
    Type: Grant
    Filed: June 29, 1998
    Date of Patent: January 30, 2001
    Assignee: Kao Corporation
    Inventors: Yuichi Irinatsu, Yoshitaka Miyauchi, Hiromichi Takahashi
  • Patent number: 6153300
    Abstract: Recycled paper pulp having at least two different types of paper which consume widely different amounts of bleaching chemical, or mixed hardwood and soft-wood pulps, are treated in a manner that enhances distribution and redistribution of bleaching chemical to enhance uniformity of the bleaching treatment. The pulp is intensely mixed to provide a homogenous mixture of fibrous material and bleaching chemical, and then is continuously or intermittently subjected to mechanical action (such as in low intensity mixers, or by agitating pulp in a retention tank) of sufficient intensity and duration so as to enhance distribution and redistribution of a bleaching chemical. Also, recycled pulp will have cleanliness which varies significantly over time, and this is accommodated by sensing at least one of the brightness, color, or lignin content (e.g.
    Type: Grant
    Filed: April 18, 1994
    Date of Patent: November 28, 2000
    Assignee: Ahlstrom Machinery, Inc.
    Inventors: C. Bertil Stromberg, Patrick E. Sharpe, Louis O. Torregrossa, Joseph R. Phillips
  • Patent number: 5997689
    Abstract: A method of bleaching secondary fibers. A secondary fiber pulp is first slushed and then transferred at a consistency of 20-40% to a disperser. In the disperser, the secondary fiber pulp is mechanically treated and mixed so that ink particles in the secondary fiber pulp are dispersed throughout the secondary fiber pulp. While the secondary fiber pulp is being treated and mixed in the disperser, oxygen is delivered to the disperser so as to distribute the oxygen within the secondary fiber pulp.
    Type: Grant
    Filed: July 3, 1997
    Date of Patent: December 7, 1999
    Assignee: AGA Aktienbolag
    Inventor: Monica Bokstrom
  • Patent number: 5958184
    Abstract: A process for producing a thiourea dioxide fluid by mixing thiourea and a peroxide, or thiourea, a peroxide and a reaction catalyst, or thiourea, a peroxide, a reaction catalyst and a chelating agent, in the absence or presence of pulp and a process for bleaching pulp by the use of the thiourea dioxide fluid produced by the above process economically advantageously with a small chemicals loss and by small consumption of energy.
    Type: Grant
    Filed: January 29, 1998
    Date of Patent: September 28, 1999
    Assignee: Mitsubishi Gas Chemical Company Inc.
    Inventors: Toshiaki Kanada, Seikyu Jinnouchi, Masafumi Shimpo, Tetsuo Koshitsuka, Akiko Kimura
  • Patent number: 5958179
    Abstract: A process for increasing a degree of whiteness of paper pulp may include bring paper fiber pulp, which may at least partially include printed waste paper, into a suspension with water. The suspension may be mixed with bleaching aids and bleaching chemicals. The bleaching chemicals may preferably contain molecular oxygen. Intensely mechanically treating the pulp, e.g., at at least 20 kWh/to, prior to bleaching the pulp suspension. The bleaching period may take at least 10 minutes, with a pressure above the atmospheric pressure being exerted during the bleaching. After bleaching, a major portion of remaining color print particles may be removed from the bleached pulp.
    Type: Grant
    Filed: April 11, 1997
    Date of Patent: September 28, 1999
    Assignee: Voith Sulzer Stoffaubereitung GmbH
    Inventors: Volker Gehr, Harald Selder
  • Patent number: 5900111
    Abstract: The invention relates to a process for sanitizing post-consumer wastepaper fibers for liquid packages and containers, a paper product for food packaging and a liquid food container. The process comprises providing paper fibers from a wastepaper recycle process, adding water to the paper fibers to achieve a slurry, de-watering the slurry to obtain a paper fiber stream and passing the fiber stream through a mixing device while heating the fiber stream and supplying hydrogen peroxide in the mixing device.
    Type: Grant
    Filed: October 21, 1997
    Date of Patent: May 4, 1999
    Assignee: Tetra Laval Holdings & Finance S.A.
    Inventors: Tommy Nystrom, Hyder Ali, Fritz Lembke
  • Patent number: 5895556
    Abstract: A waste paper treatment process for the recycle and re-use of waste paper, which process comprises treating the waste paper, in a repulper, with a surfactant, in the absence of traditional repulper chemicals such as silicate, caustic and peroxide. The surfactant is preferably a copolymer of ethylene oxide and propylene oxide, and is used in a sufficient concentration to form ink agglomerates. The ink agglomerates are retained on the paper, rather than being removed as in waste paper deinking. The process permits the elimination of normal repulper chemicals, and reduces the amount of ink sludge generated, while providing acceptable brightness levels for the recycled pulp.
    Type: Grant
    Filed: February 13, 1995
    Date of Patent: April 20, 1999
    Assignee: ICI Canada Inc.
    Inventors: Loreen D. Ferguson, Terrence J. Blain, Jeanette E. Grant, Christine M. Parent
  • Patent number: 5885412
    Abstract: A method and composition for suppressing or inhibiting the decomposing action of enzymes on hydrogen peroxide, e.g. peroxidase and catalase, during bleaching of cellulose fibres with hydrogen peroxide, especially in connection with the production of recycled paper, in such a way that microorganisms are not markedly affected, and discharges that are dangerous to the environment are minimized. The composition contains hydroxylamine, thiocyanate salts, formic acid, ascorbic acid or nitrites.
    Type: Grant
    Filed: August 8, 1995
    Date of Patent: March 23, 1999
    Assignee: Bim Kemi AB
    Inventors: Enn Paart, Kjell Abrahamsson, Peter W.ang.llberg
  • Patent number: 5801135
    Abstract: A liquid deinking composition comprising (a) a fatty acid mixture containing 40 to 90 weight % of saturated fatty acids having 12 to 14 carbon atoms and less than 60 weight % of saturated fatty acids having 16 to 18 carbon atoms, (b) a nonionic surfactant with HLB of 2 to 12 in a proportion of (a)/(b)=5/95 to 40/60 (weight ratio), and (c) 0 to 20 weight % (based on the composition) of water.No crystals of fatty acids are precipitated at ambient temperatures, and the separation, solidification or precipitation of crystals due to a temperature change is not caused. Further, the handling property is improved because of the liquid form.
    Type: Grant
    Filed: October 12, 1995
    Date of Patent: September 1, 1998
    Assignee: Kao Corporation
    Inventors: Yoshitaka Miyauchi, Toshiki Sowa, Koji Hamaguchi, Daisuke Shiba, Hiromichi Takahashi
  • Patent number: 5770010
    Abstract: This invention relates to an environmentally preferred process for the delignification of a cellulosic biomass comprising pulp. The process uses the oxidative properties of nascent oxygen to complete pulping and bleaching operations. The process may be used in a pulping stage, a bleaching stage or can be used for both the pulping and bleaching stages of a delignification process. The process does not rely on large volumes of environmentally offensive chemicals such as caustic soda, sulfur, and chlorine to achieve delignification of the pulp.
    Type: Grant
    Filed: September 13, 1996
    Date of Patent: June 23, 1998
    Assignee: R-J Holding Company
    Inventor: James W. Jelks
  • Patent number: 5755926
    Abstract: This invention provides an integrated system for recovering fibers from mixed grades of waste paper and simultaneously cleaning (deinking) waste fibers. The system comprises a mild alkaline pulping process with oxygen and hydrogen peroxide followed by rapid decompression of fibers and then by hot washing.
    Type: Grant
    Filed: February 4, 1997
    Date of Patent: May 26, 1998
    Assignee: Kimberly-Clark Worldwide, Inc.
    Inventors: Charles W. Hankins, Oldrich C. Prochazka, John F. Schmitt
  • Patent number: 5755925
    Abstract: A method of bleaching recycled paper containing pulp wherein said pulp is contacted with ozone in an ozone stage (Z) treatment with a brightness stabilizing step during or at the end of said ozone stage (Z), said stabilizing step consisting of contacting a small amount of hydrogen peroxide with said pulp, the amount of hydrogen peroxide contacted with said pulp being small compared to the amount of hydrogen peroxide usually in an hydrogen peroxide stage, no washing step of the pulp being provided between the ozone contacting step with said pulp and the hydrogen peroxide contacting step. The pulp is first submitted to a test procedure to determine whether the pulp is more reactive to ozone in acidic or alkaline conditions, and if necessary the pH is accordingly adjusted.
    Type: Grant
    Filed: January 8, 1997
    Date of Patent: May 26, 1998
    Assignee: L'Air Liquide, Societe Anonyme Pour L'Etude et L'Exploitation Des Procedes Georges Claude
    Inventors: Jack Kogan, Michel Muguet
  • Patent number: 5733412
    Abstract: The invention relates to a method for decolorizing paper pulp containing colored fibers. The paper is first pulped and subjected to fine screening. The screened pulp is then dispersed at a temperature in excess of 100.degree. C. and a pressure exceeding one atmosphere absolute pressure. Prior to the dispersing step a first agent (a reducing agent or oxidizing agent) is introduced to the pulp. A second agent is introduced to said pulp after introduction of the first agent. The second agent is an oxidizing agent when the first agent is a reducing agent, and a reducing agent when the first agent is an oxidizing agent. Finally, the dispersed pulp is recovered after the colored fibers are decolorized.
    Type: Grant
    Filed: September 13, 1995
    Date of Patent: March 31, 1998
    Assignee: International Paper Company
    Inventors: Larry D. Markham, Linda A. Beltz