EP0172135A1 - Méthode, procédé et appareil pour la conversion du bois, des résidus de bois, des fibres végétales et de la biomasse en pâte - Google Patents

Méthode, procédé et appareil pour la conversion du bois, des résidus de bois, des fibres végétales et de la biomasse en pâte Download PDF

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Publication number
EP0172135A1
EP0172135A1 EP85810326A EP85810326A EP0172135A1 EP 0172135 A1 EP0172135 A1 EP 0172135A1 EP 85810326 A EP85810326 A EP 85810326A EP 85810326 A EP85810326 A EP 85810326A EP 0172135 A1 EP0172135 A1 EP 0172135A1
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Prior art keywords
wood
range
concentration
residues
concentration range
Prior art date
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Withdrawn
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EP85810326A
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German (de)
English (en)
Inventor
Rudy Vit
Bohuslav Vaclav Kokta
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    • 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
    • D21C3/00—Pulping cellulose-containing materials
    • D21C3/22—Other features of pulping processes
    • D21C3/228—Automation of the pulping processes
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/02—Pretreatment of the raw materials by chemical or physical means
    • D21B1/021—Pretreatment of the raw materials by chemical or physical means by chemical means

Definitions

  • the present invention relates to an apparatus for converting tree chips, sawmill, or other wood residues, or vegetable fibres into pulp and more particularly, to a continuous process of handling, continuous conveying, chemical pretreating, compressing, deairing, dewatering, pressure steaming, pressure releasing, refining and non compulsory bleaching into pulp of various properties.
  • Stone ground wood pulp SGW is produced from wood logs by grinders under atmosphenc pressure.
  • Chemi-ground wood CGW is chemicly pretreated either atmospheric or pressurized way and ground under atmospheric pressure.
  • Pressurized ground wood PGW is ground under pressure at a high temperature.
  • Refiner mechanical pulp RMP is produced by refining wood chips under atmospheric refining conditions with no pretreatment
  • Thermorefiner mechanical pulp TRMP is produced from chips in refiners, similar to conditions in RMP process, except chips are presteamed at 100°C - 120°C, prior to refining.
  • Thermomechanical pulp TMP is produced from chips first presteamed at 100°C with the first stage of refining at 100°C under pressure and other refining stages are at atmospheric pressure.
  • Tandem TMP is produced from chips by first presteaming at 100°C - 125°C and followed by first and second-stage refining at elevated temperatures 110°C - 130°C.
  • Chemimechanical pulp CMP is produced from chips using a chemical pretreatment at a temperature below 100°C, followed by atmospheric refining.
  • Chemithermomechanical pulp CTMP is produced from chips pretreated with sodium sulfite Na,SO, prior to or during presteaming and first refining stage at temperatures between 100°C and 1 35°C and other refining stages at atmospheric pressure.
  • Semichemical mechanical pulp SCMP is produced from chips pretreated with chemicals at temperatures between 100°C and 130°C and then refined at atmospheric pressure.
  • Neutral sulfite semichemical pulp NSSC used mainly for hardwood species uses continuous digester of short time and low temperature cook before refining under atmospheric pressure.
  • the Kraft and sulfite processes are of low yield contributing to fast depletion of forest and other vegetable fibre resulting in high cost of produced pulp.
  • the above mentioned mechanical or refining pulping processes are of high yield, when compared to the chemical pulping processes, but require high energy input, resulting in high cost of the produced pulp.
  • the invention is directed toward a new pulping process and the pulp and paper products resulting therefrom.
  • the pulp produced by the process of the present invention is of very high yield 94% when unbleached and in a range of 86% to 92% when bleached, it requires less calorific energy, also less refining energy, in a range of 40% to 60%, of any other known refining process of virgin fibres.
  • the present invention In order to retain high yield, it is further aim of the present invention to retain all of the hemicellulose and to avoid the lignin from being solubilized.
  • the process alters some of the lignin and pitch in such a way as to form a new uncoloured complex in the pulp.
  • the chelating agents added before the chemical pretreatment. during the hydrolysis ana after the decompression of the chips or fibrous vegetable matters form, during the hydrolysis, during decompression and during refining, extremly strong bond with divalent and trivalent heavy metals and compete successfully with lignin complex to form colourless chelating complexes.
  • a process in accordance with the present invention includes the steps of conveying the wood fibres in a continuous operation for a pretreatment, under atmospheric pressure, with chemicals, then the compression of said fibre to extract air between them and to extract some of the liquid from the fibres.
  • the compressed vegetable fibres are then conveyed in a continuous manner through a pocket valve, or loading screw or vegetable fibre plug created by mechanical or hydraulical means into a pressurized steam vessel.
  • the pressurized steam vessel the vegetable fibres are freely moved by means of a worm or ribon conveyor toward the opposite site of the vessel.
  • the speed of the movement of the vegetable fibre in the pressure steaming vessel is variable. It is directly related to the rate of feed and volume of the pretreated vegetable fibre and the desired steam treatment.
  • the chemically pretreated and pressure steamed vegetable fibres are released by means of a decompression devis into a dozing bin. This action shatters the lignin and defibrate most of the vegetable fibre.
  • An apparatus in accordance with the present invention includes an intergrated system having a chemical pretreatment metering means in to the vegetable fibre flow, metering means of fibres into a fibre compression instrument, fibre compressing means, air and moisture relieve means from a fibre compression means, means to activate pocket valve, loading screw or vegetable fibre plug of a compression means.
  • means to discharge a pocket valve, or loading screw or vegetable plug into the pressurized steam vessel means to move the vegetable fibre inside the steam pressure vessel, means for activating the worm, screen or ribon conveyor according to predetermined information received from the fibre metering means, means of unloading vegetable fibre from a steam pressurized vessel into a decompression means, means to release the vegetable fibre from decompression means to a dozing means, means transporting or conveying the decompressed vegetable fibre into the refining means and non compulsory means to transport the refined pulp to bleaching means.
  • a further feature of the present invention includes a control system which includes a first scanning means at the infeed of wood fibre, input data receiving means for interpreting the data received from the first scanning means and for measuring the moisture content of the fibre and weight-volume input according to the predetermined parameters, means associated with said control system for activating a speed control of the fibre infeed, measuring means con- troled by the control system means of the fibre flow control system based on said data to introduce chemicals in solution or in a dry form into the fibre flow, means for controling the pocket valve, or loading screw or vegetable fibre plut activity, means to activate the discharging of vegetable fibre into a pressure vessel, means related to flow of vegetable fibre into a fibre compression means, means to interpret rate of feed to control the fibre movement in a steam pressure vessel according to the predetermined schedule stored in a memory, sensing means associated with discharge of fibre from pressure steam vessel, input data receiving means for interpreting and controling the refining mechanism and refining according to predetermined refining patterns stored in the memory.
  • An embodiment of the integrated processing mill includes a chip or vegetable fibre conveyor 1 for conveying vegetable fibre, a pretreatement stations 2 for application of chemicals, chips or vegetable fibre level detector 17 for controling the flow of chips or vegetable fibre through the pretreatment stations and for controling the level of chemicals 4 in the first pretreatment station 2 further a worm, or screw or ribon conveyor 3 for conveying residues from first pretreatment station 2 on to a vegetable fibre conveyor 5 leading into second pretreatment station 6.
  • a further scanner 18 may be provided for again measuring the vegetable fibre volume from the second pretreatment station 6 into the compression chamber 8 operating under a predetermined pressure, compressed fibres are then advanced through a pocket valve, or loading screw or vegetable fibre plug 9 through a steam pressure vessel 10, through a decompression chamber 11 and 12 into a non compulsory dozing bin 13 through a non compulsory washing station 14 directly on to worm, screw or ribon conveyor 15, bypassing, if desired the washing station, leading into the refiner 16. Refined pulp is discharged into latency chest 19 and further the pulp is introduced into the bleaching station 20.
  • Figure 2 shows reactions of chemical pretreatment of fibres 20 by complexing agents 21 and formation of hydrophylic groups 22, 23, 24. 25, 26, 27 on fibre surface, creating a bond 28, it also demonstrates formation of hydrophilic group 22, 23, 24 on surface of vegetable fibres 20 by oxydating agents 21.
  • Figure 3 is the step by step process sequence of chemical reactions by various pretreatment of vegetable fibres:
  • Hydrophylic groups either by oxidation or sulfonation is proportional to the concentration of chemical products, vegetable fibre, time and temperature.
  • the process is controlled by time and retention temperature.
  • Step no. 2 and 3 determining factor for chemical reaction is time, since the temperature is very low.
  • step number 4 it is the temperature which controls the extent of sulfonation or oxidation.
  • the speed of the sulfonation or oxidation may be also varied by concentration of the chemical products.
  • FIG. 3 depicts step by step the sequence of the process of pretreatment of residues, its defibration and its refining as follows:

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Paper (AREA)
EP85810326A 1984-07-17 1985-07-17 Méthode, procédé et appareil pour la conversion du bois, des résidus de bois, des fibres végétales et de la biomasse en pâte Withdrawn EP0172135A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA459020 1984-07-17
CA000459020A CA1212505A (fr) 1984-07-17 1984-07-17 Methode et installation de conversion du bois, des residus du bois et de la biomasse et pate

Publications (1)

Publication Number Publication Date
EP0172135A1 true EP0172135A1 (fr) 1986-02-19

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EP85810326A Withdrawn EP0172135A1 (fr) 1984-07-17 1985-07-17 Méthode, procédé et appareil pour la conversion du bois, des résidus de bois, des fibres végétales et de la biomasse en pâte

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EP (1) EP0172135A1 (fr)
CA (1) CA1212505A (fr)

Cited By (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0284585A2 (fr) * 1987-03-24 1988-09-28 Stake Technology Ltd. Procédé de fabrication de pâte papetière
EP0293309A1 (fr) * 1987-05-25 1988-11-30 Elf Atochem S.A. Procédé de préparation de pâtes chimicothermomécaniques
EP0351330A1 (fr) * 1988-07-12 1990-01-17 Elf Atochem S.A. Procédé de fabrication de pâtes chimicothermomécaniques blanchies
EP0501059A1 (fr) * 1991-02-28 1992-09-02 Bohuslav Vaclav Kokta Procédé de lessivage par explosion à la vapeur pour faire du papier
US5338402A (en) * 1987-05-25 1994-08-16 Societe Atochem Process for preparing a bleached chemithermomechanical pulp
WO1995009722A1 (fr) * 1993-10-07 1995-04-13 Convertech Group Limited Systeme d'hydrolyse/deshydratation a plusieurs effets destine a des matieres biologiques
GB2289695A (en) * 1994-05-27 1995-11-29 Kimberly Clark Co Sulfonated cellulose and method of preparation
US5703225A (en) * 1995-12-13 1997-12-30 Kimberly-Clark Worldwide, Inc. Sulfonated cellulose having improved absorbent properties
FR2751671A1 (fr) * 1996-07-26 1998-01-30 E Mc2 Dev Procede de fabrication de pate a papier blanchie
US5819992A (en) * 1993-10-08 1998-10-13 Convertech Group Limited Multi chamber transfer device
WO2000019004A1 (fr) * 1998-09-25 2000-04-06 Stake Technology Ltd. Traitement de vapocraquage semi-alcalin de materiau fibreux pour la production de pate a papier
US6413362B1 (en) 1999-11-24 2002-07-02 Kimberly-Clark Worldwide, Inc. Method of steam treating low yield papermaking fibers to produce a permanent curl
US6506282B2 (en) 1998-12-30 2003-01-14 Kimberly-Clark Worldwide, Inc. Steam explosion treatment with addition of chemicals
WO2004009900A1 (fr) * 2002-07-19 2004-01-29 Andritz Inc. Pretraitement de copeaux a haut degre de defibrisation
US7713381B2 (en) 2004-07-08 2010-05-11 Andritz Inc. TMP refining of destructured chips
WO2010058285A2 (fr) * 2008-11-21 2010-05-27 Inbicon A/S Procédés et dispositifs de transfert continu de matière particulaire et/ou fibreuse entre deux zones présentant des températures et des pressions différentes
US7758726B2 (en) 2004-07-08 2010-07-20 Andritz Inc. Disc refiner with increased gap between fiberizing and fibrillating bands
US8778136B2 (en) 2009-05-28 2014-07-15 Gp Cellulose Gmbh Modified cellulose from chemical kraft fiber and methods of making and using the same
US9511167B2 (en) 2009-05-28 2016-12-06 Gp Cellulose Gmbh Modified cellulose from chemical kraft fiber and methods of making and using the same
US9512563B2 (en) 2009-05-28 2016-12-06 Gp Cellulose Gmbh Surface treated modified cellulose from chemical kraft fiber and methods of making and using same
US9512237B2 (en) 2009-05-28 2016-12-06 Gp Cellulose Gmbh Method for inhibiting the growth of microbes with a modified cellulose fiber
US9617686B2 (en) 2012-04-18 2017-04-11 Gp Cellulose Gmbh Use of surfactant to treat pulp and improve the incorporation of kraft pulp into fiber for the production of viscose and other secondary fiber products
US9719208B2 (en) 2011-05-23 2017-08-01 Gp Cellulose Gmbh Low viscosity kraft fiber having reduced yellowing properties and methods of making and using the same
US9951470B2 (en) 2013-03-15 2018-04-24 Gp Cellulose Gmbh Low viscosity kraft fiber having an enhanced carboxyl content and methods of making and using the same
US10000890B2 (en) 2012-01-12 2018-06-19 Gp Cellulose Gmbh Low viscosity kraft fiber having reduced yellowing properties and methods of making and using the same
US10138598B2 (en) 2013-03-14 2018-11-27 Gp Cellulose Gmbh Method of making a highly functional, low viscosity kraft fiber using an acidic bleaching sequence and a fiber made by the process
US10151064B2 (en) 2013-02-08 2018-12-11 Gp Cellulose Gmbh Softwood kraft fiber having an improved α-cellulose content and its use in the production of chemical cellulose products
CN109706772A (zh) * 2019-02-01 2019-05-03 丰禾新材（北京）技术有限公司 一种常压制纸浆工艺
US10865519B2 (en) 2016-11-16 2020-12-15 Gp Cellulose Gmbh Modified cellulose from chemical fiber and methods of making and using the same
WO2021237436A1 (fr) * 2020-05-25 2021-12-02 海安县金鑫纸业有限公司 Système de commande de fabrication de papier pour maintenir la stabilité du poids quantitatif, de l'épaisseur et de la teneur en humidité
CN114351497A (zh) * 2021-12-27 2022-04-15 湛江晨鸣浆纸有限公司 一种阔叶木漂白机械浆的制备工艺

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3012927A (en) * 1957-09-11 1961-12-12 Process Evaluation Devel Continuous process of converting vegetable stock to paper pulp
US3684651A (en) * 1969-02-17 1972-08-15 Rolf Bertil Reinhall Digestion of fibre pulp from vegetable raw material including pulp level controls
US3822179A (en) * 1969-02-27 1974-07-02 N Chari Method and apparatus for optimizing steam consumption of continuous digester
FR2389712A1 (fr) * 1977-05-02 1978-12-01 Mo Och Domsjoe Ab
CA1075857A (fr) * 1976-02-20 1980-04-22 Price Company Limited (The) Pretraitement chimique du bois avant production de pate mecanique raffineuse

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3012927A (en) * 1957-09-11 1961-12-12 Process Evaluation Devel Continuous process of converting vegetable stock to paper pulp
US3684651A (en) * 1969-02-17 1972-08-15 Rolf Bertil Reinhall Digestion of fibre pulp from vegetable raw material including pulp level controls
US3822179A (en) * 1969-02-27 1974-07-02 N Chari Method and apparatus for optimizing steam consumption of continuous digester
CA1075857A (fr) * 1976-02-20 1980-04-22 Price Company Limited (The) Pretraitement chimique du bois avant production de pate mecanique raffineuse
FR2389712A1 (fr) * 1977-05-02 1978-12-01 Mo Och Domsjoe Ab

Non-Patent Citations (6)

* Cited by examiner, † Cited by third party
Title
ABSTRACT BULLETIN OF THE INSTITUTE OF PAPER CHEMISTRY, vol. 53, no. 7, January 1983, page 790, no. 7252, Appleton, Wisconsin, US; R.HOHOL: "Pulping methods on the threshold of change" & PULP PAPER J. 35, no. 3: 14-16 (APRIL 1982) *
ABSTRACT BULLETIN OF THE INSTITUTE OF PAPER CHEMISTRY, vol. 54, no. 3, September 1983, page 298, no. 2711, Appleton, Wisconsin, US; R.DESHAYE et al.: "Nonlinear mathematical model studies of vapor-phase ultra-high yield sulfite pulping results" & CPPA ANN. MTG. (MONTREAL) PREPRINTS 69A: 7-10(FEB 1-2,1983) *
JOURNAL OF THE TECHNICAL ASSOCIATION OF THE PULP AND PAPER INDUSTRY, vol. 63, no. 11, November 1980, pages 69-72, Atlanta, Georgia, US; E.JUTILA et al.: "Computerized process control of a continuous digester for NSSC pulping" *
JOURNAL OF THE TECHNICAL ASSOCIATION OF THE PULP AND PAPER INDUSTRY, vol. 63, no. 7, July 1980, pages 49-52, Atlanta, Georgia, US; O.-K.FADUM: "A computer-controlled vapor phase digester with a preimpregnation vessel" *
JOURNAL OF THE TECHNICAL ASSOCIATION OF THE PULP AND PAPER INDUSTRY, vol. 64, no. 6, June 1981, pages 109-113, Atlanta, Georgia, US; D.WAYE: "An approach to distributed computer control in an integrated pulp mill" *
JOURNAL OF THE TECHNICAL ASSOCIATION OF THE PULP AND PAPER INDUSTRY, vol. 67, no. 6, June 1984, pages 30-34, Atlanta, Georgia, US; J.N.McGOVERN: "Development and mill transfer of the FPL semichemical pulping process" *

Cited By (61)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0284585A2 (fr) * 1987-03-24 1988-09-28 Stake Technology Ltd. Procédé de fabrication de pâte papetière
EP0284585A3 (fr) * 1987-03-24 1991-04-17 Stake Technology Ltd. Procédé de fabrication de pâte papetière
EP0293309A1 (fr) * 1987-05-25 1988-11-30 Elf Atochem S.A. Procédé de préparation de pâtes chimicothermomécaniques
FR2615874A1 (fr) * 1987-05-25 1988-12-02 Atochem Procede de preparation de pates chimicothermomecaniques
US5338402A (en) * 1987-05-25 1994-08-16 Societe Atochem Process for preparing a bleached chemithermomechanical pulp
EP0351330A1 (fr) * 1988-07-12 1990-01-17 Elf Atochem S.A. Procédé de fabrication de pâtes chimicothermomécaniques blanchies
FR2634233A1 (fr) * 1988-07-12 1990-01-19 Atochem Procede de fabrication de pates chimicothermomecaniques blanchies
EP0501059A1 (fr) * 1991-02-28 1992-09-02 Bohuslav Vaclav Kokta Procédé de lessivage par explosion à la vapeur pour faire du papier
WO1995009722A1 (fr) * 1993-10-07 1995-04-13 Convertech Group Limited Systeme d'hydrolyse/deshydratation a plusieurs effets destine a des matieres biologiques
US5984150A (en) * 1993-10-08 1999-11-16 Convertech Group Limited Material transfer device with multi-chamber rotor
US5819992A (en) * 1993-10-08 1998-10-13 Convertech Group Limited Multi chamber transfer device
GB2289695B (en) * 1994-05-27 1998-02-04 Kimberly Clark Co Sulfonated cellulose and method of preparation
GB2289695A (en) * 1994-05-27 1995-11-29 Kimberly Clark Co Sulfonated cellulose and method of preparation
US5703225A (en) * 1995-12-13 1997-12-30 Kimberly-Clark Worldwide, Inc. Sulfonated cellulose having improved absorbent properties
FR2751671A1 (fr) * 1996-07-26 1998-01-30 E Mc2 Dev Procede de fabrication de pate a papier blanchie
WO2000019004A1 (fr) * 1998-09-25 2000-04-06 Stake Technology Ltd. Traitement de vapocraquage semi-alcalin de materiau fibreux pour la production de pate a papier
US6506282B2 (en) 1998-12-30 2003-01-14 Kimberly-Clark Worldwide, Inc. Steam explosion treatment with addition of chemicals
US6413362B1 (en) 1999-11-24 2002-07-02 Kimberly-Clark Worldwide, Inc. Method of steam treating low yield papermaking fibers to produce a permanent curl
WO2004009900A1 (fr) * 2002-07-19 2004-01-29 Andritz Inc. Pretraitement de copeaux a haut degre de defibrisation
US7300541B2 (en) * 2002-07-19 2007-11-27 Andritz Inc. High defiberization chip pretreatment
US7758721B2 (en) 2002-07-19 2010-07-20 Andritz Inc. Pulping process with high defiberization chip pretreatment
US7758720B2 (en) 2002-07-19 2010-07-20 Andritz Inc. High defiberization pretreatment process for mechanical refining
US7892400B2 (en) 2002-07-19 2011-02-22 Andritz Inc. High defiberization chip pretreatment apparatus
US7713381B2 (en) 2004-07-08 2010-05-11 Andritz Inc. TMP refining of destructured chips
US7758726B2 (en) 2004-07-08 2010-07-20 Andritz Inc. Disc refiner with increased gap between fiberizing and fibrillating bands
US7846294B2 (en) 2004-07-08 2010-12-07 Andritz Inc. Method of refining destructured chips
WO2010058285A2 (fr) * 2008-11-21 2010-05-27 Inbicon A/S Procédés et dispositifs de transfert continu de matière particulaire et/ou fibreuse entre deux zones présentant des températures et des pressions différentes
WO2010058285A3 (fr) * 2008-11-21 2010-08-26 Inbicon A/S Procédés et dispositifs de transfert continu de matière particulaire et/ou fibreuse entre deux zones présentant des températures et des pressions différentes
US8691050B2 (en) 2008-11-21 2014-04-08 Børge Holm Christensen Methods and devices for continuous transfer of particulate and/or fibrous material between two zones with different temperatures and pressures
US9511167B2 (en) 2009-05-28 2016-12-06 Gp Cellulose Gmbh Modified cellulose from chemical kraft fiber and methods of making and using the same
US9909257B2 (en) 2009-05-28 2018-03-06 Gp Cellulose Gmbh Modified cellulose from chemical kraft fiber and methods of making and using the same
US9512563B2 (en) 2009-05-28 2016-12-06 Gp Cellulose Gmbh Surface treated modified cellulose from chemical kraft fiber and methods of making and using same
US9512562B2 (en) 2009-05-28 2016-12-06 Gp Cellulose Gmbh Modified cellulose from chemical kraft fiber and methods of making and using the same
US9512561B2 (en) 2009-05-28 2016-12-06 Gp Cellulose Gmbh Modified cellulose from chemical kraft fiber and methods of making and using the same
US9512237B2 (en) 2009-05-28 2016-12-06 Gp Cellulose Gmbh Method for inhibiting the growth of microbes with a modified cellulose fiber
US11111628B2 (en) 2009-05-28 2021-09-07 Gp Cellulose Gmbh Modified cellulose from chemical kraft fiber and methods of making and using the same
US10731293B2 (en) 2009-05-28 2020-08-04 Gp Cellulose Gmbh Modified cellulose from chemical kraft fiber and methods of making and using the same
US9777432B2 (en) 2009-05-28 2017-10-03 Gp Cellulose Gmbh Modified cellulose from chemical kraft fiber and methods of making and using the same
US8778136B2 (en) 2009-05-28 2014-07-15 Gp Cellulose Gmbh Modified cellulose from chemical kraft fiber and methods of making and using the same
US9926666B2 (en) 2009-05-28 2018-03-27 Gp Cellulose Gmbh Modified cellulose from chemical kraft fiber and methods of making and using the same
USRE49570E1 (en) 2009-05-28 2023-07-04 Gp Cellulose Gmbh Modified cellulose from chemical kraft fiber and methods of making and using the same
US9970158B2 (en) 2009-05-28 2018-05-15 Gp Cellulose Gmbh Modified cellulose from chemical kraft fiber and methods of making and using the same
US10106927B2 (en) 2009-05-28 2018-10-23 Gp Cellulose Gmbh Modified cellulose from chemical kraft fiber and methods of making and using the same
US10294613B2 (en) 2011-05-23 2019-05-21 Gp Cellulose Gmbh Softwood kraft fiber having improved whiteness and brightness and methods of making and using the same technical field
US9719208B2 (en) 2011-05-23 2017-08-01 Gp Cellulose Gmbh Low viscosity kraft fiber having reduced yellowing properties and methods of making and using the same
US10000890B2 (en) 2012-01-12 2018-06-19 Gp Cellulose Gmbh Low viscosity kraft fiber having reduced yellowing properties and methods of making and using the same
US10597819B2 (en) 2012-01-12 2020-03-24 Gp Cellulose Gmbh Low viscosity kraft fiber having reduced yellowing properties and methods of making and using the same
US10995453B2 (en) 2012-01-12 2021-05-04 Gp Cellulose Gmbh Low viscosity kraft fiber having reduced yellowing properties and methods of making and using the same
US9617686B2 (en) 2012-04-18 2017-04-11 Gp Cellulose Gmbh Use of surfactant to treat pulp and improve the incorporation of kraft pulp into fiber for the production of viscose and other secondary fiber products
US10407830B2 (en) 2012-04-18 2019-09-10 Gp Cellulose Gmbh Use of surfactant to treat pulp and improve the incorporation of kraft pulp into fiber for the production of viscose and other secondary fiber products
US10151064B2 (en) 2013-02-08 2018-12-11 Gp Cellulose Gmbh Softwood kraft fiber having an improved α-cellulose content and its use in the production of chemical cellulose products
US10138598B2 (en) 2013-03-14 2018-11-27 Gp Cellulose Gmbh Method of making a highly functional, low viscosity kraft fiber using an acidic bleaching sequence and a fiber made by the process
US10550516B2 (en) 2013-03-15 2020-02-04 Gp Cellulose Gmbh Low viscosity kraft fiber having an enhanced carboxyl content and methods of making and using the same
US10294614B2 (en) 2013-03-15 2019-05-21 Gp Cellulose Gmbh Low viscosity kraft fiber having an enhanced carboxyl content and methods of making and using the same
US10753043B2 (en) 2013-03-15 2020-08-25 Gp Cellulose Gmbh Low viscosity kraft fiber having an enhanced carboxyl content and methods of making and using the same
US10174455B2 (en) 2013-03-15 2019-01-08 Gp Cellulose Gmbh Low viscosity kraft fiber having an enhanced carboxyl content and methods of making and using the same
US9951470B2 (en) 2013-03-15 2018-04-24 Gp Cellulose Gmbh Low viscosity kraft fiber having an enhanced carboxyl content and methods of making and using the same
US10865519B2 (en) 2016-11-16 2020-12-15 Gp Cellulose Gmbh Modified cellulose from chemical fiber and methods of making and using the same
CN109706772A (zh) * 2019-02-01 2019-05-03 丰禾新材（北京）技术有限公司 一种常压制纸浆工艺
WO2021237436A1 (fr) * 2020-05-25 2021-12-02 海安县金鑫纸业有限公司 Système de commande de fabrication de papier pour maintenir la stabilité du poids quantitatif, de l'épaisseur et de la teneur en humidité
CN114351497A (zh) * 2021-12-27 2022-04-15 湛江晨鸣浆纸有限公司 一种阔叶木漂白机械浆的制备工艺

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