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EP0700473B2 - Procede pour la fabrication du papier - Google Patents
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EP0700473B2 - Procede pour la fabrication du papier - Google Patents

Procede pour la fabrication du papier Download PDF

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Publication number
EP0700473B2
EP0700473B2 EP93902274A EP93902274A EP0700473B2 EP 0700473 B2 EP0700473 B2 EP 0700473B2 EP 93902274 A EP93902274 A EP 93902274A EP 93902274 A EP93902274 A EP 93902274A EP 0700473 B2 EP0700473 B2 EP 0700473B2
Authority
EP
European Patent Office
Prior art keywords
cationic
aluminum
added
polyacrylamide
aluminum salt
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
EP93902274A
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German (de)
English (en)
Other versions
EP0700473B1 (fr
EP0700473A1 (fr
Inventor
Lars Harald Petander
Tore Anders Johan DUVNÄS
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Kemira Oyj
Original Assignee
Kemira Chemicals Oy
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
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Publication of EP0700473B1 publication Critical patent/EP0700473B1/fr
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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
    • 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
    • D21H21/06—Paper forming aids
    • D21H21/10—Retention agents or drainage improvers
    • 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
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/37—Polymers of unsaturated acids or derivatives thereof, e.g. polyacrylates
    • D21H17/375—Poly(meth)acrylamide
    • 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
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/34—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/41—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing ionic groups
    • D21H17/44—Synthetic macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds containing ionic groups cationic
    • D21H17/45—Nitrogen-containing groups
    • D21H17/455—Nitrogen-containing groups comprising tertiary amine or being at least partially quaternised
    • 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
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/54—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen
    • D21H17/55—Polyamides; Polyaminoamides; Polyester-amides
    • 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
    • D21H17/33—Synthetic macromolecular compounds
    • D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • D21H17/54—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen
    • D21H17/56—Polyamines; Polyimines; Polyester-imides
    • 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
    • D21H17/66—Salts, e.g. alums
    • 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
    • D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
    • D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
    • D21H23/04—Addition to the pulp; After-treatment of added substances in the pulp
    • D21H23/06—Controlling the addition
    • D21H23/14—Controlling the addition by selecting point of addition or time of contact between components

Definitions

  • the present invention relates to a process for producing paper by adding to an aqueous fiber suspension, which possibly contains a filler, auxiliary agents to improve retention and/or dewatering, the auxiliaries being a cationic long-chain polyacrylamide and an aluminum salt, and by dewatering the fiber suspension during the sheet-forming stage.
  • an aqueous fiber suspension which possibly contains a filler, auxiliary agents to improve retention and/or dewatering, the auxiliaries being a cationic long-chain polyacrylamide and an aluminum salt, and by dewatering the fiber suspension during the sheet-forming stage.
  • the invention thus relates to improving retention and dewatering in connection with the production of paper.
  • retention agents dispersed or emulsified substances present in the pulp, such as fillers, resin dispersions, fines, etc., are flocculated, whereby they are caused to adhere to the paper web.
  • the agents used for improving retention also improve dewatering in the wire section of the paper-making machine.
  • High dewatering and high retention are indeed often achieved simultaneously.
  • Dewatering can further be divided into free dewatering and dewatering produced by means of reduced pressure. These may be contradictory, and therefore a precise balance is required between these properties.
  • the aim in selecting the retention agent is to obtain a maximally dry paper web both after the wire section and after the press section.
  • WO-A-91/07543 discloses a process for the production of paper by forming and dewatering a suspension of cellulose containing fibers and optional fillers on a wire. Three components are added to the suspension, a cationic starch, a cationic polyacrylamide and a polymeric silicic acid, in order to improve retention and dewatering at paper production.
  • EP-A-0235893 discloses paper or paper board made by passing an aqueous cellulosic suspension through a centriscreen or other shear device and then draining the purified suspension. An improved combination of retention, drainage, drying and formation is said to be achieved by adding to the suspension an excess of high molecular weight linear synthetic cationic polymer before shearing the suspension and adding bentonite after shearing.
  • the object of the present invention is to provide a paper production process wherein paper or board is made from an aqueous suspension containing cellulose fiber and possibly an inorganic filler by using a chemical combination and batching method which improve retention and dewatering.
  • the other objects are a clean machine and good compressibility. Furthermore, the quality properties of the paper must be good.
  • the invention is based on the fact that by using a long-chain polyacrylamide and an aluminum salt, a synergistic effect is achieved by adding to an aqueous fiber suspension, which possibly contains a filler, first a cationic long-chain polyacrylamide and then, directly before sheet formation, a polyaluminum salt or a combination which comprises an aluminum salt and a base or an acid which form in situ aluminum hydroxide particles having anionic surface charges, in which case the pH before sheet formation should be within the range 7-9 in order to produce the anionic surface charges of the aluminum hydroxide.
  • the present invention provides a number of advantages over the commercial systems and inventions mentioned above.
  • a long-chain cationic polyacrylamide the process is not tied to polysaccharides, for example starch, which need to be used in large amounts. Therefore there is the danger that, when passing into the cycled waters, they cause problems, since they increase the consumption of oxygen in the water and load the waste water treatment plant. Furthermore, they deteriorate dewatering in certain conditions. Polysaccharides often also contain anionic substituents, even though they are cationized. For this reason there may arise interaction with many different pulp components. At the same time the pH dependency also increases. Also, it is not possible to control sufficiently well the constancy of the quality of the polysaccharides, since they are derived from vegetable raw materials. In a cationic polyacrylamide, it is possible to produce, within very wide limits, the desired chain length and charge density.
  • the known system based on a colloidal silica sol is in general very expensive compared with the system according to the invention.
  • the known system made up of a polymer and bentonite involves certain disadvantages. It has been noted that bentonite increases the linting and porosity of paper. Its handling requires precise and rather expensive equipment. Controlling the constancy, i.e. the formation, of paper with such a system is problematic, and variations in basis weight may be great.
  • the fiber suspension cationic auxiliary chemicals which may also be polymeric, before the adding of the cationic polyacrylamide.
  • the cationic long-chain polyacrylamide is first added to the stock, which is thereafter subjected to shear forces.
  • the aluminum salt is added according to the invention after the shearing stage.
  • the cationic long-chain polyacrylamide in amounts which are much larger than when batching the retention agents in the conventional manner, just before web forming. Overdosage leads in the latter case even to a situation in which retention is no longer improved or to a situation in which strong flocculation deteriorates paper formation. According to the invention it is possible to use a 1-to 10-fold excess of cationic long-chain polyacrylamide as compared with normal use. The amount depends, for example, on the filler content of the pulp and on the cationic matter contained in the pulp. The amount of long-chain polyacrylamide is preferably about 0.01-0.2 % of the dry weight of the pulp.
  • the cationic auxiliary chemical added to the fiber suspension before the cationic polyacrylamide may be, for example, a dry-strength agent, such as a cationic or amphoteric starch or guar gum or a cationic or amphoteric short-chain polyacrylamide. It may also be a wet-strength agent, such as a polyamidamine-epichlorohydrine resin or polyamine-epichlorohydrine resin. It may also consist of cationic substances, so-called fixer chemicals, which neutralize and/or bind anionic interfering substances, such as polyethylene-imines, quaternary polyamines or alum, or polyaluminum chloride.
  • fixer chemicals which neutralize and/or bind anionic interfering substances, such as polyethylene-imines, quaternary polyamines or alum, or polyaluminum chloride.
  • cationic chemicals enhance the action of the cationic long-chain polyacrylamide, since they reduce the anionic quality of the pulp suspension and prevent interfering substances from consuming the cationic long-chain polyacrylamide intended for the flocculation of the fiber suspension.
  • the said cationic chemicals ensure that the shearing of the flocs in, for example, the pressure sieve or the feeding pump will result in stable microflocs in the headbox, since they contain a sufficient amount of cationic polyacrylamide and the surface charge of the microflocs is sufficiently cationic in order that they react with aluminum hydroxide particles having anionic charges.
  • the amount of these cationic chemicals is preferably approx. 0.01 - 1 % of the dry weight of the pulp.
  • Examples of the cationic long-chain polyacrylamides used in the invention include the following. Especially advantageous are the copolymers of acrylamide and one or two cationic unsaturated monomers. Suitable cationic monomers include dialkylamino(met)acrylates or -(met)acrylamides, in the form of acid salts or quaternary ammonium salts. The alkyl groups may each contain 1-4 carbon atoms, and the amino alkyl group may contain 1-8 carbon atoms. Dialkylaminoethyl(met)acrylates, dialkyl-aminomethyl(met)acrylamides and N,N-dialkylamino-propyl(met)-acrylamides and their quaternary salts are preferred monomers.
  • Suitable cationic monomers include diallyldialkylammonium chlorides.
  • the polymer may be either linear or cross-linked or partly cross-linked.
  • cationic polyacrylamides also include the homopolymers of cationic acrylic monomers and the mixed polymers of two or more cationic monomers, at least one of the monomers being acrylic-based.
  • a base is added to form aluminum hydroxide having anionic surface charges.
  • the base used may be, for example, sodium or potassium hydroxide, sodium or potassium carbonate, sodium or potassium metasilicate, sodium or potassium waterglasses, sodium or potassium phosphate or borate, or sodium or potassium aluminate, or mixtures of these.
  • Aluminate compounds such as sodium aluminate or potassium aluminate can also be used as the water-soluble aluminum salts.
  • acid is added in order to form, within the pH range 7-9, an aluminum hydroxide having anionic surface charges.
  • the acid used may be mineral acids such as sulfuric acid, hydrochloric acid, nitric acid or phosphoric acid, or organic acids such as oxalic acid, citric acid or tartaric acid.
  • the acid used may also be acid aluminum salts such as aluminum sulfate, aluminum chloride, aluminum nitrate, or various water-soluble aluminum hydrophosphates.
  • polyaluminum salts so-called basic aluminum salts, which are also called polyaluminum hydroxy salts or aluminum hydroxy salts.
  • polyaluminum sulfate polyaluminum chloride and polyaluminum chloride sulfate.
  • the polyaluminum salt may, in addition to the chloride and/or sulfate ion, also contain other anions, e.g. phosphate, polyphosphate, silicate, citrate, oxalate, or several of these.
  • polymeric aluminum salts of this type include PAC (polyaluminum chloride), PAS (polyaluminum sulfate), UPAX 6 (silicate-containing polyaluminum chloride), and PASS (polyaluminum sulfate silicate).
  • the net formula of the water-soluble polyaluminum salt may be, for example n[Al 2 (OH) m /Cl) 6-m ] and its alkalinity may vary so that the m-value ranges from 1 to 5 (alkalinity is respectively 16 - 83 % according to the formula (m:6) x 100). In this case the ratio Al/OH is 2:1 - 1:2.5. n is 2 or higher.
  • the said base or acid which forms in situ an aluminum hydroxide with the aluminum salt may be added to the fiber suspension, for example before the adding of the cationic long-chain polyacrylamide, or just before the aluminum salt, or after it, or simultaneously with it.
  • the aluminum hydroxide may also be formed before the moment of adding, for example in the adding tube, or in advance in sol form.
  • the amount of the aluminum salt, calculated as Al 2 O 3 , is preferably approx. 0.01-1.0 % of the dry weight of the pulp.
  • the paper pulp used may be bleached or unbleached sulfate or sulfite pulp, semichemical pulp, refiner mechanical pulp, groundwood pulp, or mixtures of these. If a filler is present, it is preferably ground or precipitated calcium carbonate, but also other fillers such as kaolin, talc or titanium oxide are possible.
  • the pH is approx. 8-8.5, normally approx. 8 when a polyaluminum salt + CaCo 3 or alum + a base are used (the Al:OH ratio being approx. 4.5).
  • the polyacrylamides A and B in the examples are copolymers of acrylamide and methyl-chloride quaternized dimethylaminoethyl acrylate. Their charge densities and molecular weights are (A) 1 mequiv./g:7 ⁇ 10 6 and (B) 1.5 mequiv./g:6 ⁇ 10 6 .
  • This example shows that the process according to the invention improves retention in a paper pulp which contains a cationic pulp starch.
  • the pulp composition is in other respects similar to that in the previous example.
  • the test series was performed in a Britt Dynamic Drainage Jar.
  • the batching methods comply with the methods described in Example 1.
  • the degree of substitution of the cationic starch was 0.035.
  • the starch was added 15 min before the polyacrylamide, and the NaOH for preliminary alkalization 5 min before the polyacrylamide.
  • the same polyacrylamides A and B were used as in Example 1. Test No.
  • the aluminum salt used was aluminum sulfate or a polyaluminum chloride product.
  • the chemical formula of polyaluminum chloride (PAC) is Al n (OH) m Cl (3n-m) . It is made up of a number of aluminum nuclei. The pulp was similar to that in the previous examples.
  • the polyaluminum chloride was batched in a manner similar to that of aluminum sulfate. The difference was that the pre-alkalization was omitted.
  • the ratio OH:Al in the following table indicates, in addition to the degree of pre-alkalization, also the alkalinity of the polyaluminum product.
  • the polyacrylamide used was the same polyacrylamide A as in Example 1.
  • the batching methods were as in Example 1.
  • Test No. Polymer/ batch kg/t Aluminum source 1:Al sulfate 2:PAC kg/t OH:Al Ash retention %
  • Batching method 1 0.3 59 I 2 1.0 57 IV 3 1.0 1/10 4.5 81 II (according to invention) 4 1.0 2/5.5 1.3 79 III (according to invention) 5 1.0 2/5.1 2 84 III (according to invention)
  • the process according to the invention works also when polyaluminum chloride (PAC) is used as the fixing agent before the polyacrylamide.
  • the test conditions are similar to those in Example 4, except that, instead of a quaternary polymer (QPOL), the polyaluminum chloride product used in Example 3 was batched.
  • the batching method was according to Example 3. Test No. Polymer/ batch kg/t Aluminum sulfate kg/t OH:AI PAC kg/t Ash retention % Batching method 1 I/1.0 10 4.5 - 52 II (according to invention) 2 I/1.0 10 4.5 2.5 63 II (according to invention)
  • Compound A is a silicate-containing polyaluminum chloride and B is polyaluminum sulfate.
  • Test No. Polymer/ batch g/t Aluminum salt kg/t Compound Ash retention % 1 1000 - 47 2 1000 2 A 56 3 1000 3 A 58 4 1000 5 A 71 5 1000 2.5 B 74 6 1000 5.0 B 77

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Paper (AREA)
  • Vending Machines For Individual Products (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Polishing Bodies And Polishing Tools (AREA)

Claims (9)

  1. Procédé de production de papier, qui comprend :
    l'addition, à une suspension aqueuse de fibres qui contient éventuellement une charge, d'un polyacrylamide cationique à longue chaíne pour former des flocs cationiques ;
    la soumission de ladite suspension, comprenant un polyacrylamide, à des forces de cisaillement, pour pulvériser lesdits flocs cationiques en microflocs ;
    puis l'addition à celle-ci d'un sel d'aluminium polymère ou d'un sel d'aluminium et, si nécessaire, d'une base ou d'un acide, pour que le pH soit compris dans l'intervalle de 7 à 9, après quoi des particules d'hydroxyde d'aluminium possédant des charges anioniques en surface vont se former in situ ;
    et, immédiatement ensuite, la formation d'une feuille à partir de la suspension, la suspension étant déshumidifiée pendant le stade de formation de la feuille,
       ledit polyacrylamide et ledit sel d'aluminium étant des agents auxiliaires pour améliorer la rétention et/ou la déshumidification.
  2. Procédé selon la revendication 1, caractérisé en ce que ladite suspension de fibres peut contenir en outre un ou plusieurs agents auxiliaires cationiques, qui peuvent être des agents de résistance à sec, tels qu'un amidon cationique,
       des agents de résistance à l'état humide, tels qu'une résine de polyamidamine-épichlorhydrine, et/ou
       des agents, tels que la polyéthyléne imine, ou les polyamines quaternaires ou l'alun, qui neutralisent et/ou fixent des substances qui interfèrent.
  3. Procédé selon la revendication 2, caractérisé en ce que ledit additif cationique ou lesdits additifs cationiques sont ajoutés à ladite suspension de fibres avant addition du polyacrylamide cationique à longue chaíne.
  4. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le sel d'aluminium utilisé est le sulfate d'aluminium, le chlorure d'aluminium ou le nitrate d'aluminium, auquel cas une base est ajoutée à la suspension de fibres pour former in situ un hydroxyde d'aluminium ayant des charges anioniques en surface.
  5. Procédé selon la revendication 4, caractérisé en ce que la base est ajoutée en une quantité telle que le rapport en moles AI/OH soit compris dans l'intervalle d'environ 1:2-1:5 et de préférence d'environ 1:3.
  6. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le sel d'aluminium polymère utilisé est un complexe soluble de polyhydroxyde d'aluminium avec un sulfate et/ou un chlorure.
  7. Procédé selon l'une quelconque des revendications précédentes caractérisé en ce que le sel d'aluminium polymère utilisé est un complexe d'hydroxyde d'aluminium soluble dans l'eau avec un sulfate et/ou un chlorure, lequel complexe contient en plus d'un anion sulfate et/ou chlorure également d'autres anions, tels que des anions phosphate, silicate, oxalate ou citrate.
  8. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce qu'on ajoute à la suspension de fibres ledit polyacrylamide cationique à longue chaíne en une quantité d'approximativement 0,0 1 à 0,2 % du poids sec de la pâte.
  9. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce qu'on ajoute à la suspension de fibres ledit sel d'aluminium polymère ou ledit sel d'aluminium en une quantité, calculée en Al2O3, d'environ 0,0 1 - 1,0 % du poids sec de la pâte.
EP93902274A 1992-01-20 1993-01-20 Procede pour la fabrication du papier Expired - Lifetime EP0700473B2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FI920246 1992-01-20
FI920246A FI920246A0 (fi) 1992-01-20 1992-01-20 Foerfarande foer tillverkning av papper.
PCT/FI1993/000019 WO1993014263A1 (fr) 1992-01-20 1993-01-20 Procede pour la fabrication du papier

Publications (3)

Publication Number Publication Date
EP0700473A1 EP0700473A1 (fr) 1996-03-13
EP0700473B1 EP0700473B1 (fr) 2000-04-05
EP0700473B2 true EP0700473B2 (fr) 2003-01-22

Family

ID=8534094

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93902274A Expired - Lifetime EP0700473B2 (fr) 1992-01-20 1993-01-20 Procede pour la fabrication du papier

Country Status (10)

Country Link
EP (1) EP0700473B2 (fr)
JP (1) JP3138475B2 (fr)
AT (1) ATE191524T1 (fr)
AU (1) AU660066B2 (fr)
CA (1) CA2127992A1 (fr)
DE (1) DE69328311T3 (fr)
ES (1) ES2146609T5 (fr)
FI (2) FI920246A0 (fr)
PT (1) PT700473E (fr)
WO (1) WO1993014263A1 (fr)

Cited By (1)

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Publication number Priority date Publication date Assignee Title
US8157962B2 (en) 2006-12-21 2012-04-17 Akzo Nobel N.V. Process for the production of cellulosic product

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US5707494A (en) * 1994-03-14 1998-01-13 E. I. Du Pont De Nemours And Company Process for preparing water soluble polyaluminosilicates
JP2000352386A (ja) 1999-06-08 2000-12-19 Mitsubishi Heavy Ind Ltd スクロール圧縮機
DE102004063005A1 (de) * 2004-12-22 2006-07-13 Basf Ag Verfahren zur Herstellung von Papier, Pappe und Karton
JP4626374B2 (ja) * 2005-04-20 2011-02-09 栗田工業株式会社 製紙方法および製紙用添加剤
US10458067B2 (en) 2017-01-31 2019-10-29 Kimberly-Clark Worldwide, Inc. High bulk tissue comprising cross-linked fibers
US11970819B2 (en) 2020-01-30 2024-04-30 Kimberly-Clark Worldwide, Inc. Tissue products comprising crosslinked fibers

Citations (4)

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Publication number Priority date Publication date Assignee Title
JPS5512868A (en) † 1978-07-12 1980-01-29 Mitsubishi Paper Mills Ltd Production of neutral paper
JPS62125096A (ja) † 1985-11-21 1987-06-06 星光化学工業株式会社 填料の歩留り向上方法
WO1988006659A1 (fr) † 1987-03-03 1988-09-07 Eka Nobel Ab Procede de production de papier
US4927498A (en) † 1988-01-13 1990-05-22 E. I. Du Pont De Nemours And Company Retention and drainage aid for papermaking

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Publication number Priority date Publication date Assignee Title
GB8602121D0 (en) * 1986-01-29 1986-03-05 Allied Colloids Ltd Paper & paper board
SE8903752D0 (sv) * 1989-11-09 1989-11-09 Eka Nobel Ab Foerfarande foer framstaellning av papper

Patent Citations (4)

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Publication number Priority date Publication date Assignee Title
JPS5512868A (en) † 1978-07-12 1980-01-29 Mitsubishi Paper Mills Ltd Production of neutral paper
JPS62125096A (ja) † 1985-11-21 1987-06-06 星光化学工業株式会社 填料の歩留り向上方法
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Cited By (1)

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Publication number Priority date Publication date Assignee Title
US8157962B2 (en) 2006-12-21 2012-04-17 Akzo Nobel N.V. Process for the production of cellulosic product

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AU3354193A (en) 1993-08-03
WO1993014263A1 (fr) 1993-07-22
PT700473E (pt) 2000-07-31
FI114406B (fi) 2004-10-15
ES2146609T5 (es) 2003-07-01
EP0700473B1 (fr) 2000-04-05
DE69328311T3 (de) 2003-07-31
JP3138475B2 (ja) 2001-02-26
ATE191524T1 (de) 2000-04-15
EP0700473A1 (fr) 1996-03-13
JPH07502791A (ja) 1995-03-23
CA2127992A1 (fr) 1993-07-22
FI920246A0 (fi) 1992-01-20
DE69328311D1 (de) 2000-05-11
ES2146609T3 (es) 2000-08-16
FI943425A0 (fi) 1994-07-19
DE69328311T2 (de) 2000-08-10
FI943425L (fi) 1994-07-19
AU660066B2 (en) 1995-06-08

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