EP0374700B1 - Procédé de préparation de pâte mécanique et de papier contenant cette pâte - Google Patents

Procédé de préparation de pâte mécanique et de papier contenant cette pâte Download PDF

Info

Publication number
EP0374700B1
EP0374700B1 EP89122946A EP89122946A EP0374700B1 EP 0374700 B1 EP0374700 B1 EP 0374700B1 EP 89122946 A EP89122946 A EP 89122946A EP 89122946 A EP89122946 A EP 89122946A EP 0374700 B1 EP0374700 B1 EP 0374700B1
Authority
EP
European Patent Office
Prior art keywords
resin
pulp
paper
lipase
amount
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
EP89122946A
Other languages
German (de)
English (en)
Other versions
EP0374700A2 (fr
EP0374700A3 (fr
Inventor
Yuko Central Research Laboratory Irie
Motoo Central Research Laboratory Matsukura
Kunio Central Research Laboratory Hata
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.)
Nippon Paper Industries Co Ltd
Original Assignee
Nippon Paper Industries Co Ltd
Jujo Paper Co Ltd
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 Nippon Paper Industries Co Ltd, Jujo Paper Co Ltd filed Critical Nippon Paper Industries Co Ltd
Priority to AT89122946T priority Critical patent/ATE102667T1/de
Publication of EP0374700A2 publication Critical patent/EP0374700A2/fr
Publication of EP0374700A3 publication Critical patent/EP0374700A3/fr
Application granted granted Critical
Publication of EP0374700B1 publication Critical patent/EP0374700B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

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
    • 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
    • D21C3/00—Pulping cellulose-containing materials
    • 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
    • D21H21/02—Agents for preventing deposition on the paper mill equipment, e.g. pitch or slime control

Definitions

  • This invention relates to a process for the manufacture of mechanical wood pulp (such as wood pulp, refiner wood pulp, etc.) and paper containing this wood pulp.
  • mechanical wood pulp such as wood pulp, refiner wood pulp, etc.
  • Mechanical wood pulp such as wood pulp
  • wood pulp is made by mechanically treating logs or wood chips, e.g. grinds with a wood sander or refiner.
  • the wood pulp obtained which has the disadvantage of a lower strength, is obtained in a higher yield, is cheaper and results in a more opaque paper compared to pulp which is produced using chemicals such as alkali, etc.
  • the resin components of the mechanical pulp remain unchanged due to the mechanical grinding.
  • the wood contains about 1-10% resin components in addition to the main wood components, cellulose, hemicellulose and lignin.
  • the softwood a main raw material of mechanical pulp, contains a large amount of resin components such as fatty acids, resin acids, glycerides, etc.
  • a part of the resin components is excreted from the wood pulp, so that the resins are suspended in water or adsorbed on the fiber surface. That is, they change from a state fixed on the fiber to an excreted (free) state.
  • the precipitated resin floating in the backwater which is referred to as "colloidal resin" consists of resin particles of approximately 0.2-2 ⁇ m in size.
  • paper is produced by treating the paper raw materials produced by various processes by sorting processes, adding various additives and forming a sheet by a paper-making machine.
  • the separated resin or the resin adsorbed on the fiber is deposited on tubes, laid paper, sieves, rollers, etc., so that resin difficulty - paper soiling, scrap, etc. - occurs.
  • the resin problems often occur with paper containing a large amount of mechanical pulp.
  • GB-A-1 189 604 describes a method which enables the duration of the "seasoning” to be shortened without cellulose degradation by prior treatment of the wood chips with lipase-producing fungi. Neither this method, which is based on “seasoning” under difficult to control conditions, nor the Addition of the surfactants, which leads to the dispersion of the resin microparticles and the removal of the resin deposit, is sufficient to avoid the resin problems.
  • the object of the invention is therefore to provide an improved process for the production of mechanical wood pulp or of paper which contains this wood pulp. Resin difficulties in particular should be reduced.
  • the inventors examined both the wood components extracted from Japanese red pine, a typical wood for mechanical wood pulp, and the resin components used in the production of the mechanical wood pulp from Japanese Red pine or the paper containing the mechanical wood pulp has been deposited. It has been found that the major constituent of the resin deposited is the same as the resin constituent in the original wood and is rich in triglycerides, fatty acids, resin acids and their metal salts. In particular, the deposited resin always contains a large amount of triglycerides. Therefore, it is believed that triglycerides mainly cause resin problems. This finding confirms the teaching contained in GB-A-1 189 604.
  • the invention relates to a method for producing mechanical pulp and / or paper containing mechanical pulp and is characterized in that that the paper raw material and / or the backwater is treated with an acylglycerol lipase, optionally in immobilized form.
  • the acylglycerol lipase used is preferably that which is produced by at least one microorganism from the group Aspergillus niger, Pseudomonas fluorescenz, Pseudomonas fragi, Geotrichum candidum and Candida cylindracea.
  • the acylglycerol lipase according to the invention is an enzyme for the hydrolysis of the triglycerides, a main component of the resin.
  • suitable acylglycerol lipases are not particularly limited.
  • z. B. Use the following: Aspergillus niger, Pseudomonas fluorescens, Pseudumonas fragi, Geotrichum candidum and Candida cylindracea, Mucor javanicus, Rhizopus javanicus, Rhizopus delemar, Rhizopus niveus and fungal strains of the genus Rhizopus.
  • the purer the acylglycerol lipase according to the invention the better the effect.
  • the acylglycerol lipases used according to the invention can be used alone or in a mixture, and they can also be used with good success in combination with other decomposition enzymes, such as cellulases, hemicellulases, proteases, etc.
  • the acylglycerol lipase according to the invention is added in an amount of 0.1-10000 ppm, based on the weight of the mechanical wood pulp, to the sludge of the paper stock which contains the mechanical wood pulp produced during the sanding of the wood.
  • the sludge obtained is then stirred or left to stand, the temperature preferably being 10-70 ° C., particularly preferably 35-55 ° C.
  • the enzyme according to the invention acts weakly and slowly.
  • the enzyme of the invention loses its activity.
  • the pH is preferably adjusted to 3-11. Outside this pH range, the activity of the enzyme is reduced. A large amount of water is used in the manufacture of the paper stock and the paper, a large part of which is circulated and reused.
  • the use of the acylglycerol lipase according to the invention leads to the avoidance of resin problems with this backwater, with a direct addition of an acylglycerol lipase to the backwater, or the addition of a so-called immobilized acylglycerol lipase or a so-called immobilized microorganism. which extracellularly produces the acylglycerol lipase, is used with a good effect.
  • the Immobilization of the enzyme or the microorganism can be carried out in a known manner by connection with a carrier, crosslinking, entrapping process, etc. Because the process according to the invention is very selective and mild, it has the advantages that the treated paper raw materials remain unchanged and the usual process is not influenced.
  • the cause of the resin difficulties is unclear, but it is believed that the resin difficulties depend on the resin concentration, substance concentration, pH, temperature, metal ion concentration and type.
  • the adhesion to the solid surface is attributed to Van der Waal's forces that fix the substances on the solid surface.
  • the interaction between the substances is based, among other things, on a hydrophobic bond or a dipole moment effect.
  • a hydrophobic or non-polar molecule or such a part of the molecule is attracted to a hydrophobic or non-polar surface.
  • a hydrophilic or polar molecule is attracted to a hydrophilic or polar surface.
  • the triglycerides appear to play the following role in depositing the resin in a process for making paper stock and paper.
  • the triglyceride, a non-polar component of the colloidal resin adheres to a hydrophobic or non-polar surface such as the metal surface of tubes, the surface of press rolls in a papermaking process, etc. due to Van der Waal's forces.
  • the adhesive portion acts as a core to which hydrophobic or non-polar molecules or parts of molecules adhere, the resin deposits being formed.
  • acylglycerol lipase acts on the non-polar triglyceride, which has high adhesiveness to a hydrophobic and non-polar surface, and which is present in the resin on the surface of the mechanical pulp or in the backwater resin and and colloidal resin.
  • the triglycerides are hydrolyzed to water-soluble glycerols and polar fatty acids, which prevents adhesion to hydrophobic metal tubes, laid walls, rollers, etc. Thus, since the adhesion of the resin is prevented from the beginning, no resin deposits are formed, so that the resin trouble is avoided.
  • the process of the present invention has the advantages that the deposition of the resin components in the manufacture of the mechanical pulp or the paper containing the mechanical pulp is prevented, and defects such as resin stains and holes in a paper sheet, etc. caused by the resin, be avoided.
  • the method of the invention has no adverse impact on paper quality and practical production, and is simple and can be used in the previous pulp and paper making process.
  • Fresh Japanese red pine chips were extracted with methanol using a Soxhlet extractor. 10 g of the extract was dissolved in a mixed solution of 100 ml of isopropanol, 60 ml of acetone and 5 ml of water to obtain a resin solution.
  • the prepared resin dispersion was adjusted to pH 7 using hydrochloric acid and / or sodium hydroxide.
  • the acylglycerol lipases were added at different concentrations and temperatures, as in Table 1 is shown and stirred for 4 hours to prepare the treated solution.
  • the treated solution was adjusted to pH 4 with aluminum sulfate and hydrochloric acid.
  • 2.5 cm of a 22 cm wide and 7 cm long polyethylene board were immersed in the solution.
  • the adjusted solution was stirred for 30 minutes using a vibromixer (linitator manufactured by US Heidon Co.).
  • the polyethylene board was extracted and dried.
  • the amount of adhesive resin was calculated and expressed as a percentage based on the amount of adhesive resin in the untreated sample.
  • Example 2 The resin dispersion prepared in Example 1 was adjusted to a pH of 7 using hydrochloric acid and / or sodium hydroxide.
  • the acylglycerol lipase was added in an amount of 500 ppm based on the resin weight and stirred at 40 ° C.
  • the amount of adhesive resin was calculated in the same manner as in Example 1; it is shown in Table 2.
  • Table 2 enzyme time Art concentration 2 hours. 4 hours 8 hours Untreated - 105 mg (100%) 101 mg (100%) 107 mg (100%) Li. OF 500 ppm 67 mg (63.8%) 31 mg (30.7%) 31 mg (24.4%) Li. GC-5 5) 500 ppm 85 mg (81.0%) 70 mg (69.3%) 59 mg (55.1%) (Note 5) Li. GC-5; Trade name: Lipase GC-5 (manufactured by Amano Seiyaku Co.) produced by Geotrichum candidum.
  • Example 4 The same sample as in Example 3 was used.
  • the enzyme according to the invention was added to the sample in an amount of 50 ppm, based on the weight of the wood pulp, and treated at different temperatures for different periods.
  • the amount of adhesive resin was measured and is shown in Table 4.
  • Table 4 enzyme pH Treatment time temperature 20 ° C 40 ° C 60 ° C Untreated - 115 mg (100%) 102 mg (100%) 117 mg (100%) Li. OF 7 2 hours. - 44 mg (53.9%) - 4 hours 64 mg (55.7%) 29 mg (28.4%) 100 mg (85.5%) 8 hours - 27 mg (26.5%) - Untreated 9 - 128 mg (100%) 121 mg (100%) 134 mg (100%) Li.
  • the enzyme according to the invention was added in an amount of 0.5 ppm, based on the weight of the return water, treated at 40 ° C. for 2 hours and stirred with a vibromixer for 120 minutes.
  • Newsprint with a basis weight of approximately 46 g / m2 was produced by the Bel-Baie-Former multi-dryer machine with a width of 5080 mm and a speed of 830 m / min, the paper raw material being made from 30% wood pulp, 45% old newspaper paper stock (without printer's ink), 10% Softwood sulfate pulp and 15% thermomechanical pulp existed.
  • the wood pulp was made from red pine, adjusted to a grinding level of 60-70 ml CSF by the post-refiner, stored as a pulp for some time, optionally mixed with other pulps and auxiliaries, stored again and finally subjected to a paper manufacturing process. It takes 90 minutes from the refiner through the laid paper and containers to the paper machine.
  • the enzyme according to the invention was added to the wood pulp sludge of 3.8% concentration before the post-refiner so that the lipase OF had a concentration of 3 ppm. This enzyme was continuously added to the wood pulp for two weeks. The amount of resin adhering to the wire and press parts and the time interval between the cleaning operations required to remove the resin adhering to the center roller were determined. The output of this machine was about 200 tons per day.
  • a light-weight printing paper with a basis weight of 34 g / m 2 was produced according to Example 7, the paper stock consisting of 20% wood pulp, 50% old newspaper paper stock (without printing ink), 15% softwood sulfate pulp and 15% thermomechanical wood pulp.
  • the Lipase OF was added to the pulp in an amount of 3 ppm.
  • the output of this machine was about 200 tons per day.
  • the amount of resin adhering in the wire and press parts and the resin holes in the paper due to the resin adhering to the fiberizing roller were determined. The results obtained were compared to those of the "untreated" method and are shown in Table 8.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Biochemistry (AREA)
  • Microbiology (AREA)
  • Paper (AREA)
  • Working-Up Tar And Pitch (AREA)
  • Preparation Of Compounds By Using Micro-Organisms (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Making Paper Articles (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)
  • Materials For Medical Uses (AREA)
  • Encapsulation Of And Coatings For Semiconductor Or Solid State Devices (AREA)

Claims (6)

  1. Procédé de préparation de pâte mécanique et/ou de papier contenant la pâte mécanique, caractérisé par le fait que l'on traite la matière première du papier et/ou l'eau recyclée avec une lipase d'acylglycérol.
  2. Procédé selon la revendication 1, caractérisé par le fait que l'on emploie une lipase d'acylglycérol qui est produite par au moins un micro-organisme que l'on choisit parmi Aspergillus niger, Pseudomonas fluorescens, Pseudomonas fragi, Geotrichum candidum et Candida cylindracea.
  3. Procédé selon la revendication 1 ou 2, caractérisé par le fait que l'on ajoute la lipase d'acylglycérol dans une proportion de 0,1- 1000 ppm, rapportée au poids de pâte mécanique.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé par le fait que le traitement de la matière première du papier et/ou de l'eau recyclée se fait à 10 - 70°C.
  5. Procédé selon la revendication 4, caractérisé par le fait que le traitement de la matière première du papier et/ou de l'eau recyclée se fait à 35 - 55°C.
  6. Procédé selon l'une des revendications 1 à 5, caractérisé par le fait que l'on amène la valeur du pH de la matière première du papier et/ou de l'eau recyclée à 3 - 11.
EP89122946A 1988-12-13 1989-12-12 Procédé de préparation de pâte mécanique et de papier contenant cette pâte Expired - Lifetime EP0374700B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89122946T ATE102667T1 (de) 1988-12-13 1989-12-12 Verfahren zur herstellung von mechanischem holzstoff und von papier, das diesen holzstoff enthaelt.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP314408/88 1988-12-13
JP63314408A JPH02160997A (ja) 1988-12-13 1988-12-13 ピッチトラブル防止法

Publications (3)

Publication Number Publication Date
EP0374700A2 EP0374700A2 (fr) 1990-06-27
EP0374700A3 EP0374700A3 (fr) 1991-11-21
EP0374700B1 true EP0374700B1 (fr) 1994-03-09

Family

ID=18052986

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89122946A Expired - Lifetime EP0374700B1 (fr) 1988-12-13 1989-12-12 Procédé de préparation de pâte mécanique et de papier contenant cette pâte

Country Status (10)

Country Link
EP (1) EP0374700B1 (fr)
JP (1) JPH02160997A (fr)
AT (1) ATE102667T1 (fr)
AU (1) AU622738B2 (fr)
CA (1) CA2005087C (fr)
DE (1) DE58907179D1 (fr)
ES (1) ES2052874T3 (fr)
FI (1) FI96520C (fr)
NO (1) NO174433C (fr)
NZ (1) NZ231637A (fr)

Families Citing this family (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ZA904441B (en) * 1989-06-22 1991-03-27 Int Paper Co Enzymatic delignification of lignocellulosic material
NZ235983A (en) * 1989-11-08 1993-01-27 Novo Nordisk As Process for hydrolysis of resins in lignocellulosic pulp using enzymes simultaneously with peroxy bleaching; ctmp fluff-pulp and absorbent articles produced therefrom
FI88315C (fi) * 1990-04-04 1993-04-26 Enso Gutzeit Oy Foerfarande foer blekning av cellulosamassa
GB9018426D0 (en) * 1990-08-22 1990-10-03 Sandoz Ltd Improvements in or relating to novel compounds
DK249990D0 (da) * 1990-10-17 1990-10-17 Novo Nordisk As Fremgangsmaade til enzymatisk pulpbehandling
JPH04240286A (ja) * 1991-01-25 1992-08-27 Novo Nordisk As 耐熱性リパーゼによるピッチトラブル防止法
FI93230C (fi) * 1991-03-22 1995-03-10 Genencor Int Europ Menetelmä mekaanisen massan pihkavaikeuksien vähentämiseksi
ES2125894T3 (es) * 1991-04-10 1999-03-16 Novo Nordisk As Hidrolisis de esteres catalizados en presencia de una lipasa.
US5616215A (en) * 1991-04-19 1997-04-01 Novo Nordisk A/S Method of making paper from pulp treated with lipase and an aluminum salt
US5667634A (en) * 1991-05-01 1997-09-16 Novo Nordisk A/S Method for controlling pitch deposits in papermaking process using lipase and polyelectrolyte
WO1992019808A1 (fr) * 1991-05-01 1992-11-12 Novo Nordisk A/S Hydrolyse d'un ester catalysee par une lipase
US5256252A (en) * 1992-07-15 1993-10-26 Nalco Chemical Company Method for controlling pitch deposits using lipase and cationic polymer
FR2727130B1 (fr) * 1994-11-21 1996-12-20 Elf Aquitaine Procede de pretraitement enzymatique des deblais de forage
US6420034B1 (en) 1998-10-13 2002-07-16 Mitsui Chemicals, Inc. Binder composition and process for manufacturing board by using the binder composition
ATE471377T1 (de) 2000-04-28 2010-07-15 Novozymes As Variante eines lipolytischen enzyms
ATE426668T1 (de) 2001-01-10 2009-04-15 Novozymes As Variante eines lipolytischen enzyms
JP2009508019A (ja) * 2005-09-13 2009-02-26 ジョンソンディーバーシー・インコーポレーテッド 紙製品の製造に使用する方法
EP2864541B1 (fr) * 2012-06-22 2017-06-14 Buckman Laboratories International, Inc Procédés d'utilisation de combinaisons d'une lipase et d'un oxydant pour le contrôle de la poix lors de processus de fabrication de papier et produits papetiers associés
MX2020001159A (es) 2013-07-19 2021-07-07 Danisco Us Inc Composiciones y metodos que comprenden una variante de enzima lipolitica.

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA758488A (en) * 1967-05-09 C. Jenness Lyle Process for treating paper pulp
GB1189604A (en) * 1965-07-20 1970-04-29 Mo Och Domsjoe Ab A process for Removing Resin Constituents from Wood Chips
JP2691735B2 (ja) * 1988-07-29 1997-12-17 サンノプコ株式会社 製紙用ピッチ付着防止剤

Also Published As

Publication number Publication date
JPH0429794B2 (fr) 1992-05-19
NO174433B (no) 1994-01-24
EP0374700A2 (fr) 1990-06-27
NO894988D0 (no) 1989-12-12
FI895901A0 (fi) 1989-12-11
ES2052874T3 (es) 1994-07-16
NO894988L (no) 1990-06-14
CA2005087C (fr) 1998-12-01
DE58907179D1 (de) 1994-04-14
NZ231637A (en) 1991-06-25
FI96520C (fi) 1996-07-10
FI96520B (fi) 1996-03-29
JPH02160997A (ja) 1990-06-20
ATE102667T1 (de) 1994-03-15
CA2005087A1 (fr) 1990-06-13
NO174433C (no) 1994-05-04
AU4582289A (en) 1990-06-21
EP0374700A3 (fr) 1991-11-21
AU622738B2 (en) 1992-04-16

Similar Documents

Publication Publication Date Title
EP0374700B1 (fr) Procédé de préparation de pâte mécanique et de papier contenant cette pâte
DE3782602T2 (de) Verfahren zur behandlung einer papierpulpe mit einer enzymatischen loesung.
DE69221060T2 (de) Verwendung von Emzymen und Flockungsmitteln zur Erhöhung der Entwässerungsneigung von Papierpulpe
DE2603889C3 (de) Verfahren zur enzymatischen Hydrolyse von Cellulose zu wasserlöslichen Zuckern
DE2354018C2 (de) Verfahren zur Förderung der Disintegration von Papier
DE69026731T2 (de) Ein Komplex von Fasermaterial und Pilzen und Verfahren zu seiner Herstellung
DE69412077T2 (de) Verfahren zur herstellung von mechanischem faserbrei
DE2541960A1 (de) Verfahren zur herstellung von alkohol aus cellulose
DE69015095T2 (de) Verfahren zur Behandlung von Zellstoff mit einer Enzymzubereitung für die Papier- und Pappeherstellung.
DE68903608T2 (de) Verfahren zur zellstoffbehandlung.
EP0584176A1 (fr) Procede a rendement ameliore pour la delignification de produits lignocellulosiques, ainsi que pour le blanchiment et le traitement d'eaux residuaires au moyen de laccases
DE2732327A1 (de) Verfahren zur gewinnung von xylan und faserstoffen aus xylanhaltigen pflanzlichen rohstoffen
DE69201949T2 (de) Verfahren zur vermeidung von harzschwierigkeiten mittels einer thermostabilen lipase.
DE3116655A1 (de) Verfahren zur verwertung von bei der tabakherstellung anfallendem celluloseabfallmaterial
DE4000558A1 (de) Verfahren, papiermasse auf das sieb einer papiermaschine zu bringen
DE4217907A1 (de) Entfaerbezusammensetzung
DE69013518T2 (de) Hydrolyse von harz in papierbrei.
EP3911609B1 (fr) Procédé de purification, à l'aide d'enzymes, d'eau de processus circulant dans une usine de traitement des déchets de papier
DE69212529T2 (de) Behandlung von alkalisch behandeltem Papierzellstoff
AT394865B (de) Verfahren zur herstellung einer xylanase-reichen und cellulase-armen enzymloesung
DE69204154T2 (de) Filzkonditionieren.
DE1038391B (de) Verfahren zum Verhindern der Schleimbildung bei der Herstellung von Papier
DE69109729T2 (de) Verfahren zur Behandlung der zum Verdünnen von Zellstoff bestimmten rückgewonnenen Abwässern.
DE1034970B (de) Verfahren zur Verhinderung von Harzausscheidungen aus Holzsulfitzellstoff
EP1663444B1 (fr) Procede pour produire une matiere de filtrage

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 CH DE ES FR GB IT LI SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE CH DE ES FR GB IT LI SE

17P Request for examination filed

Effective date: 19920515

17Q First examination report despatched

Effective date: 19930414

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: NIPPON PAPER INDUSTRIES CO., LTD.

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE CH DE ES FR GB IT LI SE

REF Corresponds to:

Ref document number: 102667

Country of ref document: AT

Date of ref document: 19940315

Kind code of ref document: T

REF Corresponds to:

Ref document number: 58907179

Country of ref document: DE

Date of ref document: 19940414

ET Fr: translation filed
ITF It: translation for a ep patent filed

Owner name: MARCHI & MITTLER S.R.L.

RIN2 Information on inventor provided after grant (corrected)

Free format text: IRIE, YUKO CENTRAL RESEARCH LABORATORY * MATSUKURA, MOTOO CENTRAL RESEARCH LABORATORY * HATA, KUNIO CENTRAL RESEARCH LABORATORY

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2052874

Country of ref document: ES

Kind code of ref document: T3

GBT Gb: translation of ep patent filed (gb section 77(6)(a)/1977)

Effective date: 19940616

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

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

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

EAL Se: european patent in force in sweden

Ref document number: 89122946.0

26N No opposition filed
REG Reference to a national code

Ref country code: GB

Ref legal event code: IF02

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 20081216

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: AT

Payment date: 20081211

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: SE

Payment date: 20081205

Year of fee payment: 20

Ref country code: BE

Payment date: 20081017

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: FR

Payment date: 20081212

Year of fee payment: 20

Ref country code: ES

Payment date: 20090113

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: DE

Payment date: 20081205

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: GB

Payment date: 20081210

Year of fee payment: 20

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20081229

Year of fee payment: 20

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

BE20 Be: patent expired

Owner name: *NIPPON PAPER INDUSTRIES CO. LTD

Effective date: 20091212

REG Reference to a national code

Ref country code: GB

Ref legal event code: PE20

Expiry date: 20091211

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20091214

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: GB

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20091211

Ref country code: ES

Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION

Effective date: 20091214