EP1076132B1 - Papierherstellungsverfahren mit Fixierung von Mineralfüllstoff auf cellulosischen Fasern - Google Patents

Papierherstellungsverfahren mit Fixierung von Mineralfüllstoff auf cellulosischen Fasern Download PDF

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Publication number
EP1076132B1
EP1076132B1 EP99402058A EP99402058A EP1076132B1 EP 1076132 B1 EP1076132 B1 EP 1076132B1 EP 99402058 A EP99402058 A EP 99402058A EP 99402058 A EP99402058 A EP 99402058A EP 1076132 B1 EP1076132 B1 EP 1076132B1
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EP
European Patent Office
Prior art keywords
ppm
paper
ions
fibers
composition
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.)
Expired - Lifetime
Application number
EP99402058A
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English (en)
French (fr)
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EP1076132A1 (de
Inventor
Didier Joisson
Christian Richard
Gilbert Schohn
Cyrille Schu
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Essity Operations France SAS
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Georgia Pacific France SAS
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.)
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Publication date
Priority to EP99402058A priority Critical patent/EP1076132B1/de
Priority to EP20080020295 priority patent/EP2058434A1/de
Application filed by Georgia Pacific France SAS filed Critical Georgia Pacific France SAS
Priority to ES99402058T priority patent/ES2318885T3/es
Priority to AT99402058T priority patent/ATE415518T1/de
Priority to DK99402058T priority patent/DK1076132T3/da
Priority to PT99402058T priority patent/PT1076132E/pt
Priority to DE69939978T priority patent/DE69939978D1/de
Priority to PCT/FR2000/002123 priority patent/WO2001012899A1/fr
Priority to US10/049,505 priority patent/US6706148B1/en
Priority to TR2002/00375T priority patent/TR200200375T2/xx
Priority to CA002381356A priority patent/CA2381356C/fr
Publication of EP1076132A1 publication Critical patent/EP1076132A1/de
Priority to NO20020711A priority patent/NO331185B1/no
Application granted granted Critical
Publication of EP1076132B1 publication Critical patent/EP1076132B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • 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
    • D21C11/00—Regeneration of pulp liquors or effluent waste waters
    • D21C11/0035—Introduction of compounds, e.g. sodium sulfate, into the cycle in order to compensate for the losses of pulping agents
    • 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
    • D21C9/004—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives inorganic 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
    • D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
    • D21H17/63—Inorganic compounds
    • D21H17/67—Water-insoluble compounds, e.g. fillers, pigments
    • D21H17/675—Oxides, hydroxides or carbonates
    • 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
    • D21H17/63—Inorganic compounds
    • D21H17/70—Inorganic compounds forming new compounds in situ, e.g. within the pulp or paper, by chemical reaction with other substances added separately

Definitions

  • the invention relates to a novel method for producing a paper sheet comprising a step of fixing a mineral filler on cellulosic fibers in aqueous suspension.
  • the fixing of the mineral fillers, for example calcium, on the fibers can be done by means of a chemical reaction causing the precipitation of an insoluble chemical compound, for example calcium carbonate, which is fixed on the fibers and fibrils of cellulose. .
  • the cellulosic fibers on which these mineral fillers are firmly attached are used for papermaking.
  • the entire paper industry is concerned.
  • the invention can indeed be applied to the manufacture of papers usually loaded with mineral materials such as printing and writing papers such as coated paper, press papers such as newsprint and light coated paper (intended for magazines ), thin papers such as cigarette paper.
  • the invention can also be applied to the manufacture of other types of paper such as absorbent papers for sanitary and domestic use which are not conventionally loaded with mineral materials.
  • Cellulosic fibers are paper fibers, short or long.
  • the aqueous suspensions of fibers are prepared from any type of pulp: chemical pulp, bleached or unbleached, mechanical or thermomechanical pulp or mixtures of these different pastes.
  • the dough can also be obtained by a process of deinking waste paper or waste paper.
  • Mineral fillers can be added directly to the manufacture of a sheet of paper.
  • mineral fillers Natural or synthetic calcium carbonates (CaCO 3 ) are most often used. They are added to papermaking fibers to improve the characteristics and properties of paper products. Mineral fillers can provide different properties to paper. Because of their crystalline structure and their particular morphology, they bring to the paper, the whiteness, the opacity, improves the thickness etc ... They are of an interesting use on the economic plan, decreasing the cost of the raw materials, being cheaper than fiber.
  • CaCO 3 natural or synthetic calcium carbonates
  • the difficulty lies in the fixing of these charges to cellulosic fibers and in particular in the strength of the charge-fiber bond.
  • the charges do not remain in contact with the fibers during the process of making a sheet of paper.
  • the mineral fine particles tend not to remain in the fibrous mat formed by the sheet and some of these particles are found in the process water, recovered and / or rejected.
  • This phenomenon is conventional in the manufacture of absorbent papers such as cellulose wadding, which are low-weight papers manufactured at high speed or by a conventional method, that is to say, dried and creped, or by a process using through-blow drying.
  • retention agents have been added to better retain the mineral fillers on the fibers.
  • the fixing process consists in introducing into a relatively concentrated aqueous suspension of fibers, a first reagent based on one of the cations forming the future precipitate, for example calcium oxide or calcium hydroxide, or slaked lime.
  • a first reagent based on one of the cations forming the future precipitate for example calcium oxide or calcium hydroxide, or slaked lime.
  • the latter patent describes a method of first impregnating calcium chloride fibers, then reacting the salt with sodium carbonate and then washing to remove sodium chloride.
  • the object of the invention is to propose a method that makes it possible to solve the problems encountered with the methods of the prior art.
  • the object of the invention is to suppress the addition of retention agents and to eliminate any preparative step of preparation in order to integrate the setting of charges in line or "in situ" in the general process of papermaking.
  • the solution of the invention is to use as water reaction medium the waters of the papermaking process, namely the water contained in the aqueous suspension of fibers, for the step of fixing the mineral fillers on the fibers. cellulose.
  • the invention therefore consists in using this reservoir of ions present in ionic equilibrium in the aqueous suspension of fibers. It is considered that all the waters of the papermaking process form a single reaction medium for precipitation.
  • This new process allows on-line integration of the step of precipitation of mineral fillers on the fibers in the more general papermaking process. It uses all the quantity of the water of the process without treating them particularly. It is fully applicable industrially and avoids the use of additional retention agents.
  • the invention relates to a method of manufacturing a sheet of paper.
  • the manufacturing composition comprises, in ionic equilibrium, sodium ions and hydrogen carbonate ions.
  • the manufacturing composition further comprises calcium and / or magnesium hydrogen carbonates.
  • the hydroxide of the inorganic filler is a calcium hydroxide.
  • the production composition is obtained from a paste resulting from a process for deinking waste paper.
  • the complete alkalimetric titer of the aqueous suspension is between 2 and 30 ° F.
  • the method according to the invention is illustrated by the functional diagram of the figure 1 .
  • the starting composition comprises in ionic equilibrium at least alkali metal ions and / or alkaline earth, and hydrogen carbonate ions, carbonates or silicates.
  • the manufacturing composition comprises in equilibrium hydrogen carbonate ions and sodium and alkaline earth ions.
  • the method of manufacturing a paper sheet comprises, after the step of preparing or supplying the production composition, a step of adding a hydroxide of a mineral filler to fix the mineral filler. on the paper fibers, before the step of forming the sheet.
  • the process for producing a sheet of paper according to the invention incorporates, among its essential steps, a step of fixing mineral fillers on the fibers, as described below.
  • the invention is based on the use of water from the manufacture of pulp or paper within the papermaking process, as a reservoir of ions and even mineral fillers, potentially precipitable.
  • the waters present in a papermaking process such as the manufacturing composition which is an aqueous suspension of cellulosic fibers, comprise a large number of ions in ionic equilibrium. The most frequent are the following: H + , OH - , HCO 3 - (hydrogen carbonate ions), CO 3 2- (carbonate ions), (nSiO 2 ) O 2- (silicate ions), Na + (sodium ion), Ca 2+ (calcium ion), Mg 2+ (magnesium ion).
  • These waters also include carbon dioxide from either atmospheric carbon dioxide, groundwater or groundwater that is used in the slurry, or chemical neutralization with industrial or recovered carbon dioxide.
  • the water therefore usually contains carbonates (CO 3 2- ), hydrogen carbonates (HCO 3 - ), and dissolved carbon dioxide, depending on the pH value.
  • Water recovered or recycled in papermaking processes contains mineral ions.
  • the sodium ions are in larger quantities and are in the form of hydrogen carbonates when the neutralizations inherent to the deinking process are carried out from carbon dioxide.
  • the molar ratio of sodium ions to other alkaline earth metal ions is often greater than two. The sodium ion thus participates very actively in the ionic equilibrium.
  • the cations are mostly balanced by the presence of hydrogen carbonate ions. This is measured by the complete alkalimetic titer (or TAC). This title is between 2 and 30 ° F. Water from a process of deinking old papers, are characterized by a relatively high TAC, due to the presence of a significant amount of sodium ions in equilibrium with the hydrogen carbonate ions. Examples of an aqueous suspension composition of cellulosic fibers that can be used in the invention are given below.
  • the invention proposes to use the ionic equilibrium of the aqueous suspension based on cellulosic fibers in order to fix inorganic fillers on the fibers by insolubilization or precipitation.
  • the alkali metal and / or alkaline earth metal hydrogen carbonate ions which, in the presence of a calcium hydroxide (the only reactant), react to form a precipitate of calcium carbonate which has just occurred. fix on cellulose fibers and fibrils.
  • the invention consists in using hydrogen carbonate ions in equilibrium with sodium ions, and to a lesser extent with calcium and magnesium ions as a source of carbonate ions (CO 3 2- ), in order to precipitate a complex based on essentially calcium carbonate by addition of calcium hydroxide.
  • Other compounds may also precipitate in the form of silicates or metal carbonates according to the composition of the water used, and to be fixed on the fibers.
  • the calcium hydroxide is added in soluble form or preferably in the form of milk (lime) which is highly concentrated.
  • the milk comprises particles of calcium hydroxide with an average diameter of less than 6 ⁇ m.
  • the volume of added calcium hydroxide in the form of milk can be very low, in a ratio of up to 1 per 1000.
  • This concentration facilitates the integration of this step online, in the papermaking process and has above all a beneficial effect on the distribution of the crystals on all the fibers. Indeed, thanks to the almost instantaneous reaction of this small volume with the suspension of the fibers, there is a strong temporary basicity concentrated in contact with the fibers, which promotes the chemical bonding of the precipitate on the fibers.
  • the pH of the aqueous fiber suspension is generally modified as well as the ionic conditions specific to the formation of the sheet. It is therefore necessary to adjust the pH by neutralizing and stabilizing it.
  • This pH adjustment can take place in the aqueous suspension of fibers where the mineral fillers are fixed on the fibers, before the formation of the sheet.
  • the gas containing carbon dioxide is then injected into the silo of the sewage water.
  • the fibers are then recovered at about 5% and the ionically regenerated waters again containing hydrogen carbonate ions are recycled to 95% in the starting manufacturing composition.
  • sodium ions recycled with water from paper manufacturing, have an essential function. They first provide hydrogen carbonate ions for the instantaneous precipitation of calcium carbonate (reaction a)), then instantaneously capture hydrogen carbonate ions from the injected carbon dioxide (reaction e)) to stabilize the pH and regenerate the equilibria. ionic.
  • this process is very advantageous and makes it possible to fix mineral fillers on the fibers directly during the process of manufacturing a sheet of paper.
  • An aqueous suspension of cellulosic fibers is prepared from virgin fibers suspended in ground water.
  • the pH is close to 8.
  • the calcium hydroxide particles have an average diameter of less than 6 microns. In less than 60 seconds, the pH stabilizes at 10.7.
  • a sample is taken to make a paper form according to the conventional method (Formette Franck). From this suspension, it is possible to produce shaped tablets rich in fixed calcium carbonate. We find a retention rate close to 90%, from a basis weight of 25 g / m 2 , this without adding a retention agent. Above 80 g / m 2 , the retention rate becomes close to 100%.
  • the form contains about 11.7% calcium carbonate.
  • the pH can be reduced to lower values by injecting into the suspension a gas containing 10% carbon dioxide or more, neutralizing sodium hydroxide, magnesium hydroxide and soluble calcium hydroxide.
  • An aqueous suspension of cellulosic fibers is prepared from a suspension of fibers from a recycling or de-inking process of waste paper.
  • the pH is close to 8.
  • the calcium hydroxide particles in lime milk have an average diameter of less than 6 microns.
  • the pH stabilizes at 9.8.
  • a sample is taken to make a paper form according to the conventional method (Formette Franck). From this suspension, it is possible to manufacture formlets, rich in fixed calcium carbonate. We find a retention rate close to 90%, from a basis weight of 25 g / m 2 , this without adding a retention agent. Above 80 g / m 2 , the retention rate becomes close to 100%.
  • the form contains about 13.5% calcium carbonate.
  • the pH can be reduced to lower values by injecting into the suspension a gas containing 10% carbon dioxide or more, neutralizing the alkaline elements, essentially sodium hydroxide.
  • An aqueous suspension of cellulosic fibers is prepared from a manufacturing composition containing sodium hydrogencarbonate.
  • the pH is around 8.4.
  • the pH stabilizes rapidly at 8.8.
  • a sample is taken to make a paper form according to the conventional method (Formette Franck). From this suspension, it is possible to manufacture formlets, and according to the retention rate of the fine cellulose particles rich in fixed calcium carbonate, there is a retention rate of the mineral charges close to 90%, from a basis weight of 25 g / m 2 , this without adding retention agent. Above 80 g / m 2 , the retention rate becomes close to 100%.
  • the form contains about 15% calcium carbonate.
  • diluted carbon dioxide is injected into the air up to 10%.
  • the carbon dioxide is recovered from the boiler combustion fumes. Carbon dioxide essentially reformed sodium hydrogencarbonate.

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  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (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)
  • Cell Separators (AREA)
  • Adhesives Or Adhesive Processes (AREA)
  • Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
  • Table Devices Or Equipment (AREA)
  • Chemical Or Physical Treatment Of Fibers (AREA)

Claims (10)

  1. Verfahren zum Herstellen eines Papierbogens, dadurch gekennzeichnet, dass es darin besteht:
    a) einen Stoffeintrag auf Basis von Wasser und Stoff aus gebleichten oder ungebleichten Zellstofffasern, Holzschliff oder Braunschliff oder ihren Gemischen zuzubereiten oder bereitzustellen, der im Ionengleichgewicht mindestens Alkalimetall- und/oder Erdalkalimetall-Ionen und Hydrogencarbonat-, Carbonat- oder Silicat-Ionen enthält;
    b) dem Stoffeintrag ein Hydroxid eines mineralischen Füllstoffs beizumischen, um direkt bzw. in situ den mineralischen Füllstoff an den Papierfasern zu fixieren, und
    c) ausgehend von den auf diese Weise mit Füllstoffen versehenen Papierfasern in Suspension auf einer Papiermaschine einen nassen Papierbogen zu bilden und den Bogen zu trocknen,
    d) die Siebabwässer des Schritts c) rückzugewinnen und ein kohlendioxidhaltiges Gas in diese einzupressen, um den pH der Wässer zu neutralisieren und zu stabilisieren, und
    e) die auf diese Weise behandelten Wässer im Stoffeintrag des Schritts a) wiederzuverwerten.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass der Stoffeintrag ein Ionengleichgewicht von Natrium-Ionen und Hydrogencarbonat-Ionen aufweist.
  3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der Stoffeintrag ausgehend von einem Stoff erhalten wird, der aus einem Verfahren zur Druckfarbenentfernung bei Recyclingpapieren stammt.
  4. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass das Hydroxid des mineralischen Füllstoffs ein Calciumhydroxid ist.
  5. Verfahren nach Anspruch 4, dadurch gekennzeichnet, dass das Calciumhydroxid in Form von konzentrierter Kalkmilch oder in löslicher Form beigemischt wird.
  6. Verfahren nach Anspruch 5, dadurch gekennzeichnet, dass die Kalkmilch Calciumhydroxidpartikel mit einem mittleren Durchmesser, der kleiner als 6 µm ist, enthält.
  7. Verfahren nach Anspruch 2 in Kombination mit einem der Ansprüche 4 bis 6, dadurch gekennzeichnet, dass der Stoffeintrag außerdem Calcium- und/oder Magnesiumhydrogencarbonate enthält.
  8. Verfahren nach einem der Ansprüche 4 bis 7, dadurch gekennzeichnet, dass der Gesamtalkaligehalt der wässrigen Suspension im Bereich zwischen 2 und 30 °F liegt.
  9. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass der Stoffeintrag zwischen 20 und 1000 ppm Natrium-Ionen (Na+) enthält.
  10. Verfahren nach Anspruch 7, dadurch gekennzeichnet, dass der Stoffeintrag zwischen 5 und 200 ppm Calcium-Ionen (Ca2+) und/oder zwischen 5 und 200 ppm Magnesium-Ionen (Mg2+) enthält.
EP99402058A 1999-08-13 1999-08-13 Papierherstellungsverfahren mit Fixierung von Mineralfüllstoff auf cellulosischen Fasern Expired - Lifetime EP1076132B1 (de)

Priority Applications (12)

Application Number Priority Date Filing Date Title
EP20080020295 EP2058434A1 (de) 1999-08-13 1999-08-13 Method of manufacturing a sheet of paper including a step of fixing a mineral charge to cellulose fibres
ES99402058T ES2318885T3 (es) 1999-08-13 1999-08-13 Procedimiento de fabricacion de una hoja de papel que comprende la fijacion de una carga mineral sobre una fibras celulosicas.
AT99402058T ATE415518T1 (de) 1999-08-13 1999-08-13 Papierherstellungsverfahren mit fixierung von mineralfüllstoff auf cellulosischen fasern
DK99402058T DK1076132T3 (da) 1999-08-13 1999-08-13 Fremgangsmåde til fremstilling af et ark papir og omfattende et trin til fastgöring af mineralsk fyldstof på cellulosefibre
PT99402058T PT1076132E (pt) 1999-08-13 1999-08-13 Processo de fabrico de uma folha de papel que inclui a fixação de uma carga mineral sobre fibras celulósicas
DE69939978T DE69939978D1 (de) 1999-08-13 1999-08-13 Papierherstellungsverfahren mit Fixierung von Mineralfüllstoff auf cellulosischen Fasern
EP99402058A EP1076132B1 (de) 1999-08-13 1999-08-13 Papierherstellungsverfahren mit Fixierung von Mineralfüllstoff auf cellulosischen Fasern
CA002381356A CA2381356C (fr) 1999-08-13 2000-07-24 Procede pour fixer une charge minerale sur des fibres cellulosiques et procede de fabrication d'une feuille de papier
PCT/FR2000/002123 WO2001012899A1 (fr) 1999-08-13 2000-07-24 Procede pour fixer une charge minerale sur des fibres cellulosiques et procede de fabrication d'une feuille de papier
US10/049,505 US6706148B1 (en) 1999-08-13 2000-07-24 Method for fixing a mineral filler on cellulosic fibers and method for making a sheet of paper
TR2002/00375T TR200200375T2 (tr) 1999-08-13 2000-07-24 Selüloz lifleri üzerine mineral yük bağlama yöntemi ve kağıt yaprak üretme yöntemi.
NO20020711A NO331185B1 (no) 1999-08-13 2002-02-12 Fremgangsmate for fremstilling av et papirark

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP99402058A EP1076132B1 (de) 1999-08-13 1999-08-13 Papierherstellungsverfahren mit Fixierung von Mineralfüllstoff auf cellulosischen Fasern

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP20080020295 Division EP2058434A1 (de) 1999-08-13 1999-08-13 Method of manufacturing a sheet of paper including a step of fixing a mineral charge to cellulose fibres

Publications (2)

Publication Number Publication Date
EP1076132A1 EP1076132A1 (de) 2001-02-14
EP1076132B1 true EP1076132B1 (de) 2008-11-26

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Application Number Title Priority Date Filing Date
EP99402058A Expired - Lifetime EP1076132B1 (de) 1999-08-13 1999-08-13 Papierherstellungsverfahren mit Fixierung von Mineralfüllstoff auf cellulosischen Fasern
EP20080020295 Ceased EP2058434A1 (de) 1999-08-13 1999-08-13 Method of manufacturing a sheet of paper including a step of fixing a mineral charge to cellulose fibres

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Application Number Title Priority Date Filing Date
EP20080020295 Ceased EP2058434A1 (de) 1999-08-13 1999-08-13 Method of manufacturing a sheet of paper including a step of fixing a mineral charge to cellulose fibres

Country Status (11)

Country Link
US (1) US6706148B1 (de)
EP (2) EP1076132B1 (de)
AT (1) ATE415518T1 (de)
CA (1) CA2381356C (de)
DE (1) DE69939978D1 (de)
DK (1) DK1076132T3 (de)
ES (1) ES2318885T3 (de)
NO (1) NO331185B1 (de)
PT (1) PT1076132E (de)
TR (1) TR200200375T2 (de)
WO (1) WO2001012899A1 (de)

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WO2019197862A1 (en) * 2018-04-13 2019-10-17 Eldorado Brasil Celulose S.A. A process for manufacturing an improved web material by the in-situ measurement and adjustment of ion concentration
CN114318937A (zh) * 2020-09-27 2022-04-12 牡丹江市海洋新材料科技有限责任公司 可溶性硅酸盐、聚合氯化铝、絮凝剂在多领域组合使用的新方法
CN115491927B (zh) * 2022-09-28 2023-11-10 福建星城纸业有限公司 一种高强度拷贝纸及其生产方法

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CA2381356A1 (fr) 2001-02-22
CA2381356C (fr) 2009-04-28
PT1076132E (pt) 2009-02-24
ES2318885T3 (es) 2009-05-01
NO20020711L (no) 2002-04-15
US6706148B1 (en) 2004-03-16
WO2001012899A1 (fr) 2001-02-22
DE69939978D1 (de) 2009-01-08
NO20020711D0 (no) 2002-02-12
ATE415518T1 (de) 2008-12-15
EP2058434A1 (de) 2009-05-13
TR200200375T2 (tr) 2002-08-21
NO331185B1 (no) 2011-10-24
DK1076132T3 (da) 2009-03-16

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