EP1774097A2 - Utilisation de cyclodextrine afin de reduire la reversion de blancheur et le jaunissement de la pate et du papier - Google Patents

Utilisation de cyclodextrine afin de reduire la reversion de blancheur et le jaunissement de la pate et du papier

Info

Publication number
EP1774097A2
EP1774097A2 EP05769014A EP05769014A EP1774097A2 EP 1774097 A2 EP1774097 A2 EP 1774097A2 EP 05769014 A EP05769014 A EP 05769014A EP 05769014 A EP05769014 A EP 05769014A EP 1774097 A2 EP1774097 A2 EP 1774097A2
Authority
EP
European Patent Office
Prior art keywords
cyclodextrin
pulp
paper
yellowing
chromophore
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP05769014A
Other languages
German (de)
English (en)
Inventor
Greg Delozier
Kim Bloomfield
Jing Luo
Hui Xu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Novozymes North America Inc
Original Assignee
Novozymes North America Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Novozymes North America Inc filed Critical Novozymes North America Inc
Publication of EP1774097A2 publication Critical patent/EP1774097A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/20—Macromolecular organic compounds
    • D21H17/21—Macromolecular organic compounds of natural origin; Derivatives thereof
    • D21H17/24—Polysaccharides
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/001—Modification of pulp properties
    • D21C9/002—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives
    • D21C9/005—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives organic compounds
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/143—Agents preventing ageing of paper, e.g. radiation absorbing substances
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials
    • D21C5/005—Treatment of cellulose-containing material with microorganisms or enzymes
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
    • D21C9/02—Washing ; Displacing cooking or pulp-treating liquors contained in the pulp by fluids, e.g. wash water or other pulp-treating agents
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/005—Microorganisms or enzymes

Definitions

  • the present invention relates to a method for preventing or reducing yellowing/brightness reversion of paper and pulps.
  • Paper production involves, as a first step, the formation of pulp from wood.
  • raw or pre-treated wood chips are "cooked" under high pressure and temperature in the presence of alkali and sulfide to dissolve the polymeric lignaceous material between the individual wood fibers.
  • the liberated fibers still contain significant amounts of the colored lignaceous material within the fiber wall that can be removed to varying degrees via a spectrum of conventional bleaching operations/chemistries.
  • the bleached wood fiber may contain various amounts of residual lignin and extractives (e.g. resin acids, fatty acids, triglycerides, terpenes, terpenoids, waxes, etc.).
  • Paper and pulps prepared from bleached fiber containing trace amounts of residual lignin and/or extractives have been associated with enhanced sensitivity to color/brightness reversion upon exposure to elevated temperatures. Such thermal extremes can be encountered during conventional shipping and storage operations or within the dryer section and at the paper reel winder as the bleached fiber is converted into the final paper end- product.
  • heat-sensitive precursors of chromophores such as lignin, extractives, as well as oxidation, condensation and cyclization products of carbohydrate origin (e.g. 2-furfural, hydroxymethyl furaldehyde, etc.) can be converted to chromophores resulting in yellowing (color reversion) or brightness reversion of the end product which is undesirable. Therefore such chromophore precursors should preferably be removed from the pulp at washing stages throughout pulping, bleaching and papermaking operations.
  • a more aggressive washing regime is required to remove such color-forming components and is accomplished by means of investment in new equipment and/or existing equipment upgrades. Not only does this generally correspond to increased water and energy consumption, additional washing may increase the yield loss.
  • Another means to reduce the concentration of chromophores precursors is to incorporate an additional stage into the bleaching sequence which not only necessitates significant capital expenditure, but also requires the increased usage of chemicals. Regardless of the treatment, certain color- forming materials may still remain within the washed pulp (especially those of carbohydrate origin).
  • the present invention therefore relates to a method for reducing or preventing yellowing/brightness reversion of pulp and paper during conditions associated with conventional use (e.g. storage, shipping, paper production, archiving, etc.) comprising entraping the chromophore precursors present in the pulp within cyclodextrin rings and removing the resulting inclusion complex, such as, during conventional washing by adding or generating the cyclodextrin before or during washing.
  • conventional use e.g. storage, shipping, paper production, archiving, etc.
  • the aspect of the present invention therefore relates to a method for reducing yellowing/brightness reversion of pulp and paper comprising direct addition of cyclodextrin to the pulp or in situ generation of cyclodextrin followed by a subsequent washing step to remove the formed cyclodextrin inclusion complexes.
  • the present invention relates to paper production and to the reduction of yellowing and/or brightness reversion of the pulp or the paper product.
  • Pulp can be prepared from wood (virgin pulp) in a conventional kraft pulping procedure as described above or from recycled paper. Frequently, pulp will be comprised of a combination of the two fibre sources. For the purposes of the present invention, any type of paper making process is relevant and/or any paper making pulp can be applied.
  • the amount of pulp based on recycled paper relative to the total amount of pulp is at least 2%, or at least 4%, or at least 6%, or at least 8%, or at least 10%, or at least 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, 75, 80, 85, 90 or at least 95%.
  • the part of the pulp which is not derived from recycled paper may be derived from mechanical pulping, chemical pulping, and any mixtures thereof, such as, chemi-mechanical pulping, thermo-mechanical pulping, chemi-thermo-mechanical pulping, etc.
  • a papermaking pulp often comprises both recycled paper and fresh so-called virgin pulp.
  • the source of recycled fibre can be any of the grades of recycled furnishes known in the art or mixtures thereof, as well as mixtures of recycled fibres with virgin fibres.
  • Major grades of recycled fibre furnishes are for instance MOW (mixed office waste), SOW (sorted office waste), ONP (old newsprint), OMG (old magazines) and OCC (old corrugated containers).
  • raw or pre-treated wood chips are "cooked” under high pressure and temperature in the presence of alkali and sulfide to dissolve the polymeric lignaceous material between the individual wood fibers.
  • the liberated fibers still contain significant amounts of the colored lignaceous material within the fiber wall that can be removed to varying degrees via a spectrum of conventional bleaching operations/chemistries.
  • the bleached wood fiber may contain various amounts of residual lignin and extractives (e.g. resin acids, fatty acids, triglycerides, terpenes, terpenoids, waxes, etc.).
  • Extractives such as the hydrophobic fatty acids and esters are very problematic during paper making process. They can cause severe deposits on the process equipment. In addition, the presence of these extractive compounds has been associated with increased sensitivity to thermo-yellowing. Even after lipase treatment, the newly formed long chain fatty acids are still too hydrophobic to dissolve in the process water.
  • Suspected heat-sensitive precursors of chromophore molecules within conventionally pulped and bleached wood furnishes include residual lignin and extractives as well as oxidation, condensation and cyclization products of carbohydrate origin (e.g. 2-furfural, hydroxymethyl furaldehyde, etc.). Formation of chromophores, in response to elevated temperatures, ultimately manifests as a "yellowing” or "brightness reversion" of the end- product. In most instances, chromophore precursors are lipophilic with limited solubility within the process water.
  • a chromophore comprises any compound which will give rise to a coloring of the pulp or paper.
  • the chromophore can be formed from a chromophore precursor at elevated temperatures.
  • Cyclodextrin may effectively entrap the chromophore and/or chromophore precursor and enhance their solubility in water. This corresponds to enhanced removal of the chromophore/chromophore precursors from the pulp at the washing stage.
  • many of the precursors adversely affect certain physical properties of paper (i.e. tear, tensile, bulk, etc.) but physically disrupting interfiber interactions through adsorption onto the fiber surface.
  • Enhanced removal through formation of complexes with cyclodextrins may enable a degree of recovery of any number of these affected properties.
  • cyclodextins The most important feature of cyclodextins is their ability to form solid inclusion complexes (host-guest complexes).
  • the lipophilic cavity of cyclodextrin molecules provides a micro-environment into which an appropriately sized non-polar moiety can enter to form an inclusion complex.
  • Inclusion in cyclodextrins exerts a profound effect on physiochemical properties of guest molecules as they are temporarily locked or caged within the host cavity, which give rise to some unique beneficial modifications of the guest molecules.
  • the properties include solubility enhancement of highly insoluble guests, stabilization of labile guests against the degradation, masking off flavours, and controlled release of drugs and flavours.
  • solubility enhancement of entrapped chromophore/chromophore precursor molecules is utilized.
  • Cyclodextrin may effectively entrap those hydrophobic materials and enhance their solubility in water. Cyclodextrin can also work with lipases and other enzymes to improve the efficiency.
  • the paper making process comprises the following steps: a) preparing a pulp from wood and/or material comprising recycled paper; b) adding or in situ generating cyclodextrin; c) washing; d) making paper from the treated pulp.
  • steps a)-d) further, optional, steps may be included, for example one or more of the following steps: e) treating the pulp with one or more enzymes; f) de-inking, e.g. by pulping the fibres in the presence of an aqueous alkaline solution, optionally containing a peroxide compound, such as hydrogen peroxide; g) separation of the fibres from the contaminants, e.g. by screening (coarse and/or fine); h) centrifugal cleaning; i) flotation, e.g. using one or more surfactants; j) washing, e.g. using one or more surfactants; k) dispersion; e.g. using one or more surfactants; and/or
  • the enzyme may be introduced prior to the pulping, during a pulping stage, during or before, preferably right before, a stock preparation stage, or after a flotation or a de-inking stage.
  • a purpose of the present invention is therefore to provide a method for reducing yellowing of pulp and paper comprising adding to the pulp or in situ generating cyclodextrin followed by a subsequent washing step to remove the formed cyclodextrin inclusion complexes from the pulp.
  • the formation of the cyclodextrin inclusion complexes may also disrupt the conversion of the entrapped chromophore precursors.
  • Cyclodextrin may be used in the form of alpha-, beta-, and gamma-cyclodextrin. In one particular embodiment the cyclodextrin is alpha-cyclodextrin. Cyclodextrin should preferably be present during washing of the pulp but can be added at an earlier stage. In one embodiment cyclodextrin is added during pulp formation. In another embodiment cyclodextrin is added after pulp formation but before washing. In still another embodiment cyclodextrin is added during washing.
  • the ratio of fatty acid to cyclodextrin is in one embodiment in the range from 10:1 to 1 :100, particularly from 5:1 to 1:75, even more particularly from 2:1 to 1 :50.
  • cyclodextrin instead of adding cyclodextrin it could also be generated in situ, e.g. generated in the pulp from starch and glycosyltransferase (CGTase).
  • CGTase glycosyltransferase
  • the cyclodextrin is generated in situ from starch and glycosyltransferase.
  • enzymatic treatments may be employed as are well known in the art of paper making and include enzymes selected from the following group of enzymes: proteases, amylases, pullulanases, lipases, hemicellulases, endoglucanases, cutinases, and pectinases; as well as any combination thereof.
  • the present invention therefore relates to the combination of enzymatic treatment of pulp with addition of cyclodextrins.
  • Suitable enzymes are enzymes that will facilitate the release and complex formation of the chromophore or chromophore precursors.
  • Xylanase is known in the art as an enzyme capable of reducing yellowing of pulp and paper.
  • the cyclodextrin treatment of the pulp is combined with a xylanase treatment.
  • Example 1 Improved thermo stability of bleached eucalvpt kraft pulp (BEKP) by addition of alpha-cvclodextrin
  • Launder-Ometer beakers (The Launder-Ometer (Atlas Electric Devices Company, Chicago, IL, USA) is a standard piece of equipment used in the textile industry that spins the beakers, end-over-end, within a pre-heated, .water-filled chamber.) containing 400 g of 5% w/w consistency BEKP were prepared (the initial pH of the pulp was not adjusted prior to cyclodextrin application).
  • alpha-cyclodextrin was aliquoted to each beaker according to the chart above to achieve the desired final concentrations.
  • the handsheets were then "aged” for 15 minutes at 160 0 C and the optical qualitative measurements repeated.
  • thermo stability of BEKP was improved resulting in a reduction in yellowing of pulp pads by the addition of alpha-cyclodextrin.
  • Linoleic acid is the most abundant fatty acid in wood extractives and constitutes a potential chromophore.
  • a 0.1% linoleic acid suspension and a 1.0% alpha- cyclodextrin solution was prepared as follows:
  • Linoleic acid solution stays suspended as long as agitation is continued.
  • a 1.0% alpha-cyclodextrin solution was prepared by dissolving 2 g of alpha- cyclodextrinin 200 ml deionized water.
  • the 0.1% linoleic acid suspension was mixed with the 1.0 % cyclodextrin solution at different ratios of fatty acid to cyclodextrin and the increase in turbidity was determined.
  • the results are given in the Table 2 below.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Paper (AREA)

Abstract

Cette invention se rapporte au problème de la coloration qui produite une réversion de blancheur et un jaunissement de la pâte et du papier. Cette réversion de blancheur et ce jaunissement peuvent être réduits à l'aide du procédé décrit dans l'invention; ce procédé consiste à réduire le jaunissement de la pâte et du papier par application ou production de cyclodextrine sur la pâte avant ou pendant l'opération de lavage.
EP05769014A 2004-07-07 2005-07-07 Utilisation de cyclodextrine afin de reduire la reversion de blancheur et le jaunissement de la pate et du papier Withdrawn EP1774097A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US58600404P 2004-07-07 2004-07-07
PCT/US2005/024156 WO2006014563A2 (fr) 2004-07-07 2005-07-07 Utilisation de cyclodextrine afin de reduire la reversion de blancheur et le jaunissement de la pate et du papier

Publications (1)

Publication Number Publication Date
EP1774097A2 true EP1774097A2 (fr) 2007-04-18

Family

ID=35787656

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05769014A Withdrawn EP1774097A2 (fr) 2004-07-07 2005-07-07 Utilisation de cyclodextrine afin de reduire la reversion de blancheur et le jaunissement de la pate et du papier

Country Status (9)

Country Link
US (1) US20080041541A1 (fr)
EP (1) EP1774097A2 (fr)
JP (1) JP2008506046A (fr)
CN (1) CN101124362A (fr)
AU (1) AU2005269835A1 (fr)
BR (1) BRPI0512990A (fr)
CA (1) CA2572918A1 (fr)
NO (1) NO20070657L (fr)
WO (1) WO2006014563A2 (fr)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060124266A1 (en) * 2004-11-23 2006-06-15 Novozymes North America, Inc. Use of cyclodextrins for reducing deposits during paper production
CN101120137B (zh) 2005-02-15 2013-07-10 佐治亚技术研究公司 用于改变材料粘性的方法
US8512523B2 (en) * 2006-02-14 2013-08-20 Georgia Tech Research Corporation Method for altering the tack of materials
WO2009006262A1 (fr) * 2007-06-28 2009-01-08 Buckman Laboratories International, Inc. Utilisation de cyclodextrines pour contrôler les odeurs dans des boues issues de la fabrication de papier, boue désodorisée et produits
JP6694651B2 (ja) * 2014-11-07 2020-05-20 日本食品化工株式会社 油性インク除去剤及びその製造方法
JP7131296B2 (ja) * 2018-10-26 2022-09-06 王子ホールディングス株式会社 微細繊維状セルロース含有組成物およびその製造方法
US20220034039A1 (en) * 2018-12-18 2022-02-03 North Carolina State University Fast disintegrating paper products and methods of making

Family Cites Families (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1717799A (en) * 1924-04-16 1929-06-18 Robert A Marr Pulp product
US3426011A (en) * 1967-02-13 1969-02-04 Corn Products Co Cyclodextrins with anionic properties
US3453259A (en) * 1967-03-22 1969-07-01 Corn Products Co Cyclodextrin polyol ethers and their oxidation products
JPS636196A (ja) * 1986-06-26 1988-01-12 柴内　裕子 紙の製造方法
US5176796A (en) * 1988-12-13 1993-01-05 Jujo Paper Co., Ltd. Avoiding pitch troubles using acylgerol lipase
US5354424A (en) * 1989-02-10 1994-10-11 Rha Chokyun Paper composition and methods therefor
DK131193D0 (fr) * 1993-11-23 1993-11-23 Novo Nordisk As
US5776842A (en) * 1994-06-23 1998-07-07 Cellresin Technologies, Llc Cellulosic web with a contaminant barrier or trap
AU723502B2 (en) * 1997-07-23 2000-08-31 Ciba Specialty Chemicals Holding Inc. Inhibition of pulp and paper yellowing using nitroxides and other coadditives
ATE266764T1 (de) * 1998-09-22 2004-05-15 Alfred Pohlen Verfahren zur eliminierung von klebrigen verunreinigungen aus aufbereitetem altpapier enthaltende papierbreie mittels hydrophobierten mineralien
US6689378B1 (en) * 1999-12-28 2004-02-10 Kimberly-Clark Worldwide, Inc. Cyclodextrins covalently bound to polysaccharides
WO2002064875A2 (fr) * 2001-02-12 2002-08-22 The Procter & Gamble Company Agents et systemes empechant la salete de se redeposer
US6849156B2 (en) * 2001-07-11 2005-02-01 Arie Cornelis Besemer Cationic fibers
DE10149313A1 (de) * 2001-10-05 2003-04-17 Bayer Ag Verwendung wässriger Aufhellerpräparationen zum Aufhellen von natürlichen und synthetischen Materialien
US20050107282A1 (en) * 2002-11-14 2005-05-19 The Procter & Gamble Company Wipes and their use
US7282113B2 (en) * 2004-11-17 2007-10-16 Tritexco, Inc. Method for enzymatic deinking of waste papers, the waste papers so treated and the treating composition
US20060124266A1 (en) * 2004-11-23 2006-06-15 Novozymes North America, Inc. Use of cyclodextrins for reducing deposits during paper production
US20060142432A1 (en) * 2004-12-29 2006-06-29 Harrington John C Retention and drainage in the manufacture of paper
WO2006113221A1 (fr) * 2005-04-13 2006-10-26 Novozymes North America, Inc. Procedes de reduction de la corrosion associee au dioxyde de chlore

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2006014563A2 *

Also Published As

Publication number Publication date
WO2006014563A3 (fr) 2007-09-13
JP2008506046A (ja) 2008-02-28
NO20070657L (no) 2007-02-06
CA2572918A1 (fr) 2006-02-09
BRPI0512990A (pt) 2008-04-22
AU2005269835A1 (en) 2006-02-09
US20080041541A1 (en) 2008-02-21
CN101124362A (zh) 2008-02-13
WO2006014563A2 (fr) 2006-02-09

Similar Documents

Publication Publication Date Title
RU2424388C2 (ru) Усовершенствованный способ производства целлюлозы, бумаги и картона
Mussatto et al. Hydrogen peroxide bleaching of cellulose pulps obtained from brewer’s spent grain
EP2504487B1 (fr) Procédé de fabrication de pâte à papier à base de cellulose nano-fibrillée et utilisation de pâte à papier dans la fabrication de papier ou dans des composites à base de cellulose nano-fibrillée
ES2623411T3 (es) Métodos para controlar los contaminantes orgánicos en fibras
Cadena et al. Influence of the hexenuronic acid content on refining and ageing in eucalyptus TCF pulp
Garcia-Ubasart et al. Enzymatic treatments of pulp using laccase and hydrophobic compounds
US20080041541A1 (en) Uso of Cyclodextrin for Reducing Yellowing of Pulp and Paper
Aracri et al. Application of laccase-natural mediator systems to sisal pulp: an effective approach to biobleaching or functionalizing pulp fibres?
US4260452A (en) Production of paper pulp from sugar mill bagasse
RU2573675C2 (ru) Садкость бумажной продукции
NO167160B (no) Fremgangsmaate for lyshetsstabilisering av bleket ligninholdig cellulosemasse.
Chen et al. Modification of old corrugated container pulp with laccase and laccase–mediator system
US20150053358A1 (en) Methods To Control Organic Contaminants In Fibers Using Zeolites
CN1986960A (zh) 用漆酶处理occ纸浆提高瓦楞箱板纸强度的技术
US20150240423A1 (en) Effect of low dose xylanase on pulp in prebleach treatment process
AU660966B2 (en) A method for reducing pitch trouble in mechanical pulp
Dapia et al. TCF bleaching of hardwood pulps obtained in organic acid media: Production of viscose-grade pulps
NO820336L (no) Fremstilling av kjemimekanisk masse
Fardim et al. Pulp fibers for papermaking and cellulose dissolution
US20020134519A1 (en) Method for eliminating detrimental substances in a process liquid
CA2999019C (fr) Methode de repulpage servant a retirer le durcissement lignocellulosique
Sigoillot et al. Energy saving with fungal enzymatic treatment of industrial poplar alkaline peroxide pulps
Bajpai et al. Pulp and paper making process
JP2002249993A (ja) 脱インキパルプの製造方法
JPH11100785A (ja) オゾンによるピッチトラブル防止方法

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

AX Request for extension of the european patent

Extension state: AL BA HR MK YU

DAX Request for extension of the european patent (deleted)
R17D Deferred search report published (corrected)

Effective date: 20070913

RIC1 Information provided on ipc code assigned before grant

Ipc: D21C 9/02 20060101ALI20071004BHEP

Ipc: D21C 9/10 20060101ALI20071004BHEP

Ipc: D21H 17/24 20060101AFI20071004BHEP

17P Request for examination filed

Effective date: 20080313

RBV Designated contracting states (corrected)

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HU IE IS IT LI LT LU LV MC NL PL PT RO SE SI SK TR

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 20100202