EP0430915A1 - Procedure for the production pulp - Google Patents
Procedure for the production pulp Download PDFInfo
- Publication number
- EP0430915A1 EP0430915A1 EP19900850385 EP90850385A EP0430915A1 EP 0430915 A1 EP0430915 A1 EP 0430915A1 EP 19900850385 EP19900850385 EP 19900850385 EP 90850385 A EP90850385 A EP 90850385A EP 0430915 A1 EP0430915 A1 EP 0430915A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- enzyme
- production
- mechanical pulp
- energy consumption
- reduce
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 108090000790 Enzymes Proteins 0.000 claims abstract description 35
- 102000004190 Enzymes Human genes 0.000 claims abstract description 35
- 229920001131 Pulp (paper) Polymers 0.000 claims abstract description 14
- 239000000126 substance Substances 0.000 claims abstract description 13
- 230000003301 hydrolyzing effect Effects 0.000 claims abstract description 11
- 238000005265 energy consumption Methods 0.000 claims abstract description 10
- 229920002678 cellulose Polymers 0.000 claims abstract description 8
- 239000001913 cellulose Substances 0.000 claims abstract description 8
- 229920002488 Hemicellulose Polymers 0.000 claims abstract description 7
- 230000033116 oxidation-reduction process Effects 0.000 claims abstract description 5
- 229940088598 enzyme Drugs 0.000 claims description 30
- 239000000203 mixture Substances 0.000 claims description 16
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims description 6
- OSVXSBDYLRYLIG-UHFFFAOYSA-N dioxidochlorine(.) Chemical compound O=Cl=O OSVXSBDYLRYLIG-UHFFFAOYSA-N 0.000 claims description 6
- 108010059892 Cellulase Proteins 0.000 claims description 5
- 108010059820 Polygalacturonase Proteins 0.000 claims description 5
- 229940106157 cellulase Drugs 0.000 claims description 5
- 108010093305 exopolygalacturonase Proteins 0.000 claims description 5
- 229940059442 hemicellulase Drugs 0.000 claims description 5
- 108010002430 hemicellulase Proteins 0.000 claims description 5
- 108090000371 Esterases Proteins 0.000 claims description 4
- 150000003839 salts Chemical class 0.000 claims description 4
- 239000004155 Chlorine dioxide Substances 0.000 claims description 3
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 3
- 235000019398 chlorine dioxide Nutrition 0.000 claims description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims 4
- 235000000346 sugar Nutrition 0.000 claims 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims 3
- 239000001301 oxygen Substances 0.000 claims 3
- 229910052760 oxygen Inorganic materials 0.000 claims 3
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims 2
- 239000000460 chlorine Substances 0.000 claims 2
- 229910052801 chlorine Inorganic materials 0.000 claims 2
- 229910052757 nitrogen Inorganic materials 0.000 claims 2
- 150000007524 organic acids Chemical class 0.000 claims 2
- 235000005985 organic acids Nutrition 0.000 claims 2
- 230000001590 oxidative effect Effects 0.000 claims 2
- 150000008163 sugars Chemical class 0.000 claims 2
- 239000003963 antioxidant agent Substances 0.000 claims 1
- 235000006708 antioxidants Nutrition 0.000 claims 1
- 230000003647 oxidation Effects 0.000 claims 1
- 238000007254 oxidation reaction Methods 0.000 claims 1
- 238000007670 refining Methods 0.000 abstract description 14
- 239000002023 wood Substances 0.000 description 8
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 101710121765 Endo-1,4-beta-xylanase Proteins 0.000 description 2
- 241000233866 Fungi Species 0.000 description 2
- 241000223259 Trichoderma Species 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 239000008399 tap water Substances 0.000 description 2
- 235000020679 tap water Nutrition 0.000 description 2
- 102100031260 Acyl-coenzyme A thioesterase THEM4 Human genes 0.000 description 1
- 241000228212 Aspergillus Species 0.000 description 1
- 241000894006 Bacteria Species 0.000 description 1
- 101000638510 Homo sapiens Acyl-coenzyme A thioesterase THEM4 Proteins 0.000 description 1
- 241000218657 Picea Species 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000000149 argon plasma sintering Methods 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003467 diminishing effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 229920005610 lignin Polymers 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
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
- 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 a procedure for the production of mechanical pulp from a fibrous product.
- the production of mechanical pulp from a fibrous product, such as whole wood, wood chips, chips or refined pulp is mainly implemented by mechanical methods.
- the production of mechanical pulp is based on the utilization of friction. Energy is transferred to the wood in a compress-release process generating frictional heat which softens the wood so that individual fibres can be released.
- the object of the present invention is to create a solution that allows the refining energy requirement to be reduced from its present level.
- the invention is characterized in that the fibrous product is subjected to an enzyme treatment in which an enzyme acts on the hemicellulose and/or cellulose in the fibrous product.
- an enzyme treatment in which an enzyme acts on the hemicellulose and/or cellulose in the fibrous product.
- the fibrous product is treated e.g. with the enzymes produced by the fungi Aspergillus or Trichoderma (r), which act on cellulose and/or hemicelluose, in the presence of suitable oxidation-reduction chemicals or salts, a reduction in the refining energy is achieved even if a short reaction time is used, and no sterilization of the raw material is necessary.
- the raw material subjected to enzyme treatment may be either whole wood, wood chips, or pulp refined one or more times.
- the enzyme action requires a good contact with as large a fibre area as possible.
- the purpose of the enzyme treatment is to modify the structure of the hemicellulose and/or cellulose in the fibres in such a way that the fibres will come apart more easily during mechanical refining.
- the desired result is achieved by treating the fibrous product with a hydrolytic enzyme.
- the enzyme to be used is preferably hemicellulase, cellulase, esterase, pectinase or a mixture of these. Suitable enzymes are the xylanase, cellulase or pectinase produced by mold fungi or bacteria, e.g. Trichoderma (r).
- the temperature range of the enzyme treatment may be 10-90°C, preferably 40-70°C, and the pH range 2.0-10.0, preferably 4.0-8.0.
- Hydrolytic enzymes such as hemicellulase, cellulase, pectinase, esterase allow a large redox potential of the order of approx. -50 - 500 mV.
- suitable oxidation-reduction chemicals by means of which the lignin is so modified and resolved as to allow the hydrolytic enzymes to act on the hemicellulose and/or cellulose.
- Suitable chemicals thus used as redox regulators are e.g. ozone, hydrogen peroxide, chlorine dioxide and inorganic salts, used either by themselves or in mixtures.
- sodium hydroxide in an amount of 4% of the dry matter of the mixture was added to the mixture. After 1 h 20 min, durig which time the mixture was not stirred, the mixture was concentrated, centrifugalized, homogenized and frozen.
- the pulp was refined in a Sprout Waldron d 30 cm refiner with a diminishing blade distance. The refining was performed twice and the energy required for the refining each time was measured. After each refining run, a sample of 200 g (average) was taken. The samples were analyzed to determine the freeness value (CSF), fibre distribution, fibre length and shives content. In addition, a circulation water sheet was produced from each sample and analyzed to determine its density, tensile index, tear index, light scattering coefficient, light absorption coefficient and blue reflectance factor.
- CSF freeness value
- a circulation water sheet was produced from each sample and analyzed to determine its density, tensile index, tear index, light scattering coefficient, light absorption coefficient and blue reflectance factor.
- test 2 illustrating the invention
- tests 1 The results of this test are also presented in Table 1 and in Fig. 1, which shows the energy consumption E as a function of the freeness value CSF.
- the pulp was not subjected to an enzyme treatment, but it was treated with tap water in conditions corresponding to those of the enzyme treatment in test 2. In all other respects, the treatment was performed as described above (test 2).
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biochemistry (AREA)
- Microbiology (AREA)
- Paper (AREA)
- Chemical Or Physical Treatment Of Fibers (AREA)
Abstract
The invention relates to a procedure for the production of mechanical pulp from a fibrous product. To reduce the refining energy, the fibrous product is subjected to an enzyme treatment in which an enzyme acts on the hemicellulose and/or cellulose in the fibrous product. When hydrolytic enzymes are used, it is preferable to use oxidation-reduction chemicals to adjust the redox potential to the optimum level characteristic of each hydrolytic enzyme. In addition to reducing the refining energy consumption, the enzyme treatment also improves the strength properties and the blue reflectance factor of the pulp.
Description
- The present invention relates to a procedure for the production of mechanical pulp from a fibrous product.
- The production of mechanical pulp from a fibrous product, such as whole wood, wood chips, chips or refined pulp is mainly implemented by mechanical methods. The production of mechanical pulp is based on the utilization of friction. Energy is transferred to the wood in a compress-release process generating frictional heat which softens the wood so that individual fibres can be released.
- Traditionally, mechanical pulp is produced either by grinding or refining. These methods have the disadvantage of a high energy consumption, but they also have the advantage of a high yield (about 95%). In the more advanced versions of the refining method, heat (TMP, thermomechanical pulp) and possibly also chemicals (CTMP) are used. Moreover, it has recently been established that the energy consumption in the defibration and refining of wood can be reduced by allowing white-rot fungi to act either on wood chips or on pulp produced by a single refining operation. However, this method has the disadvantage that the required reaction time is several days, even weeks. Besides, the reaction requires sterile conditions. These circumstances are an obstacle to large-scale and economical utilization of the method.
- The object of the present invention is to create a solution that allows the refining energy requirement to be reduced from its present level. The invention is characterized in that the fibrous product is subjected to an enzyme treatment in which an enzyme acts on the hemicellulose and/or cellulose in the fibrous product. When the fibrous product is treated e.g. with the enzymes produced by the fungi Aspergillus or Trichoderma (r), which act on cellulose and/or hemicelluose, in the presence of suitable oxidation-reduction chemicals or salts, a reduction in the refining energy is achieved even if a short reaction time is used, and no sterilization of the raw material is necessary.
- In the procedure of the invention, the raw material subjected to enzyme treatment may be either whole wood, wood chips, or pulp refined one or more times. However, the enzyme action requires a good contact with as large a fibre area as possible.
- The purpose of the enzyme treatment is to modify the structure of the hemicellulose and/or cellulose in the fibres in such a way that the fibres will come apart more easily during mechanical refining. The desired result is achieved by treating the fibrous product with a hydrolytic enzyme. The enzyme to be used is preferably hemicellulase, cellulase, esterase, pectinase or a mixture of these. Suitable enzymes are the xylanase, cellulase or pectinase produced by mold fungi or bacteria, e.g. Trichoderma (r). The temperature range of the enzyme treatment may be 10-90°C, preferably 40-70°C, and the pH range 2.0-10.0, preferably 4.0-8.0. Hydrolytic enzymes such as hemicellulase, cellulase, pectinase, esterase allow a large redox potential of the order of approx. -50 - 500 mV. However, it is preferable to adjust the redox potential using suitable oxidation-reduction chemicals, by means of which the lignin is so modified and resolved as to allow the hydrolytic enzymes to act on the hemicellulose and/or cellulose. Suitable chemicals thus used as redox regulators are e.g. ozone, hydrogen peroxide, chlorine dioxide and inorganic salts, used either by themselves or in mixtures.
- In the following, the invention is described in detail by the aid of an embodiment example based on laboratory tests.
- 2000 g of once-refined TMP spruce wood pulp was elutriated in tap water so that the mixture obtained had a consistency of 2.9%. Hemicellulase was added to the mixture so that a mixture with a xylanase activity of 2 U/g of dry matter was obtained. The temperature of the mixture during the enzyme treatment was 20°C and the treating time was 3 h.
- After the enzyme treatment, sodium hydroxide (in an amount of 4% of the dry matter of the mixture) was added to the mixture. After 1 h 20 min, durig which time the mixture was not stirred, the mixture was concentrated, centrifugalized, homogenized and frozen.
- The pulp was refined in a Sprout Waldron d 30 cm refiner with a diminishing blade distance. The refining was performed twice and the energy required for the refining each time was measured. After each refining run, a sample of 200 g (average) was taken. The samples were analyzed to determine the freeness value (CSF), fibre distribution, fibre length and shives content. In addition, a circulation water sheet was produced from each sample and analyzed to determine its density, tensile index, tear index, light scattering coefficient, light absorption coefficient and blue reflectance factor.
- The analytical tests reflecting the refining result and the quality of the pulp are presented in Table 1.
- In addition to the above-described test (test 2) illustrating the invention, a reference test (tests 1) was carried out. The results of this test are also presented in Table 1 and in Fig. 1, which shows the energy consumption E as a function of the freeness value CSF.
- The reference test was performed as follows:
- The pulp was not subjected to an enzyme treatment, but it was treated with tap water in conditions corresponding to those of the enzyme treatment in test 2. In all other respects, the treatment was performed as described above (test 2).
- It can be seen from the results that the refining energy can be reduced if once-refined TMP pulp is subjected to an enzyme treatment as provided by the invention.
- It can also be stated that the blue reflectance factor and certain strength properties of the enzyme-treated pulps were better than in the case of the control pulp.
-
Claims (13)
- Procedure for the production of mechanical pulp from a fibrous product, characterized in that the fibrous product is subjected to an enzyme treatment in which an enzyme acts on the hemicellulose and/or cellulose in the fibrous product.
- Procedure according to claim 1, characterized in that a hydrolytic enzyme acts on the hemicellulose and/or cellulose in the fibrous product.
- Procedure according to claim 1 or 2, characterized in that, when hydrolytic enzymes are used, the redox potential is adjusted by means of suitable oxidation-reduction chemicals.
- Procedure according to any of the preceding claims, characterized in that the hydrolytic enzyme used is preferably hemicellulase, cellulase, esterase, pectinase or a mixture of these.
- Procedure according to any of the preceding claims, characterized in that the oxidation chemical used with the hydrolytic enzyme is preferably hydrogen peroxide, ozone, chlorine dioxide, gaseous chlorine or oxygen, used either by themselves or in mixtures.
- Procedure according to any of the preceding claims, characterized in that the reduction chemicals used with the hydrolytic enzyme are preferably gaseous nitrogen, sugars or sugar derivatives, organic acids or inorganic salts, used either by themselves or in mixtures.
- Procedure according to any of the preceding claims, characterized in that the enzyme treatment takes place within a temperature range of 10-90°C, preferably 40-75°C, and within a pH range of 2.0-10.0, preferably 4.0-8.0.
- Use of enzymes acting on hemicellulose and/or cellulose to reduce the energy consumption in the production of mechanical pulp.
- Use of an enzyme according to claim 8 to reduce the energy consumption in the production of mechanical pulp when hydrolytic enzymes are used.
- Use of an enzyme according to claim 8 to reduce the energy consumption in the production of mechanical pulp when an oxidation-reduction chemical is used.
- Use of an oxidizing chemical according to claim 10 to reduce the energy consumption in the production of mechanical pulp, the oxidizing chemical being hydrogen peroxide, ozone, chlorine dioxide, gaseous chlorine or oxygen, used either by themselves or in mixtures.
- Use of a reduction chemical according to claim 10 to reduce the energy consumption in the production of mechanical pulp, the reduction chemicals being gaseous nitrogen or oxygen, antioxidants, sugars or sugar derivates, organic acids or inorganic salts, used either by themselves or in mixtures.
- Use of hemicellulase, cellulase, esterase, pectinase or mixtures of these according to claim 8-12 to reduce the energy consumption in the production of mechanical pulp.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FI895676 | 1989-11-27 | ||
FI895676A FI92414B (en) | 1989-11-27 | 1989-11-27 | Process for mass production |
Publications (1)
Publication Number | Publication Date |
---|---|
EP0430915A1 true EP0430915A1 (en) | 1991-06-05 |
Family
ID=8529431
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19900850385 Withdrawn EP0430915A1 (en) | 1989-11-27 | 1990-11-26 | Procedure for the production pulp |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP0430915A1 (en) |
JP (1) | JPH03174079A (en) |
CA (1) | CA2030836A1 (en) |
FI (1) | FI92414B (en) |
NO (1) | NO905134L (en) |
Cited By (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1992016687A1 (en) * | 1991-03-22 | 1992-10-01 | Genencor International Europe Oy | A method for reducing pitch trouble in mechanical pulp |
WO1993007332A1 (en) * | 1991-10-10 | 1993-04-15 | Valtion Teknillinen Tutkimuskeskus | Method for enzymatic treatment of lignocellulosic materials, in particular cellulose pulps |
EP0546721A1 (en) * | 1991-11-26 | 1993-06-16 | The Mead Corporation | Treating lignocellulosic materials |
EP0581446A1 (en) * | 1992-07-17 | 1994-02-02 | Metsä-Serla Oy | Method for the treatment of mechanical pulps |
WO1994020666A1 (en) * | 1993-03-03 | 1994-09-15 | Valtion Teknillinen Tutkimuskeskus | Process for preparing mechanical pulp |
WO1997040194A1 (en) * | 1996-04-25 | 1997-10-30 | Union Camp Corporation | Improved method for biological pretreatment of wood chips |
US5725732A (en) * | 1994-11-18 | 1998-03-10 | P. H. Glatfelter Company | Process for treating hardwood pulp with an enzyme mixture to reduce vessel element picking |
US5770012A (en) * | 1994-11-18 | 1998-06-23 | P. H. Glatfelter Co. | Process for treating paper machine stock containing bleached hardwood pulp with an enzyme mixture to reduce vessel element picking |
WO2004022842A1 (en) * | 2002-09-06 | 2004-03-18 | Stora Enso Aktiebolag | A method of producing mechanical pulp and the mechanical pulp thus produced |
WO2005056915A1 (en) * | 2003-12-11 | 2005-06-23 | Valtion Teknillinen Tutkimuskeskus | Process for preparing mechanical pulp |
US6939437B1 (en) | 1999-11-19 | 2005-09-06 | Buckman Laboratories International, Inc. | Paper making processes using enzyme and polymer combinations |
WO2005106110A1 (en) * | 2004-05-03 | 2005-11-10 | Centre Technique De L'industrie Des Papiers, Cartons Et Celluloses | Method for mechanical pulp production |
WO2012042146A1 (en) * | 2010-09-30 | 2012-04-05 | Arjo Wiggins Fine Papers Limited | Method for refining, in an enzymatic medium, paper pulp comprising cellulose fibers in order to reduce the length of said fibers |
CN102791923A (en) * | 2009-10-16 | 2012-11-21 | 菲布里亚塞鲁洛斯有限公司 | Process for producing differentiated cellulose fibers comprising an enzymatic treatment in association with an acid step |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH04240287A (en) * | 1991-01-21 | 1992-08-27 | Kobe Steel Ltd | Bleaching of pulp |
US9145640B2 (en) | 2013-01-31 | 2015-09-29 | University Of New Brunswick | Enzymatic treatment of wood chips |
US9127401B2 (en) | 2013-01-31 | 2015-09-08 | University Of New Brunswick | Wood pulp treatment |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2557894A1 (en) * | 1984-01-10 | 1985-07-12 | Centre Tech Ind Papier | Process for treating papermaking pulps with an enzyme solution promoting fibrillation and pulps thus treated |
WO1988003190A1 (en) * | 1986-10-24 | 1988-05-05 | Call Hans Peter | Process for producing cellulose from lignin-containing raw materials |
EP0351655A1 (en) * | 1988-07-22 | 1990-01-24 | Genencor International Europe Oy | A method for the treatment of pulp |
-
1989
- 1989-11-27 FI FI895676A patent/FI92414B/en not_active Application Discontinuation
-
1990
- 1990-11-26 CA CA 2030836 patent/CA2030836A1/en not_active Abandoned
- 1990-11-26 EP EP19900850385 patent/EP0430915A1/en not_active Withdrawn
- 1990-11-27 NO NO90905134A patent/NO905134L/en unknown
- 1990-11-27 JP JP32133990A patent/JPH03174079A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2557894A1 (en) * | 1984-01-10 | 1985-07-12 | Centre Tech Ind Papier | Process for treating papermaking pulps with an enzyme solution promoting fibrillation and pulps thus treated |
WO1988003190A1 (en) * | 1986-10-24 | 1988-05-05 | Call Hans Peter | Process for producing cellulose from lignin-containing raw materials |
EP0351655A1 (en) * | 1988-07-22 | 1990-01-24 | Genencor International Europe Oy | A method for the treatment of pulp |
Cited By (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO1992016687A1 (en) * | 1991-03-22 | 1992-10-01 | Genencor International Europe Oy | A method for reducing pitch trouble in mechanical pulp |
WO1993007332A1 (en) * | 1991-10-10 | 1993-04-15 | Valtion Teknillinen Tutkimuskeskus | Method for enzymatic treatment of lignocellulosic materials, in particular cellulose pulps |
EP0546721A1 (en) * | 1991-11-26 | 1993-06-16 | The Mead Corporation | Treating lignocellulosic materials |
US5374555A (en) * | 1991-11-26 | 1994-12-20 | The Mead Corporation | Protease catalyzed treatments of lignocellulose materials |
EP0581446A1 (en) * | 1992-07-17 | 1994-02-02 | Metsä-Serla Oy | Method for the treatment of mechanical pulps |
US5415735A (en) * | 1992-07-17 | 1995-05-16 | Metsa-Serla Oy | Recovery of organic substances dissolved in mechanical pulp |
WO1994020666A1 (en) * | 1993-03-03 | 1994-09-15 | Valtion Teknillinen Tutkimuskeskus | Process for preparing mechanical pulp |
WO1994020667A1 (en) * | 1993-03-03 | 1994-09-15 | Valtion Teknillinen Tutkimuskeskus | Process and enzyme preparation for preparing mechanical pulp |
US5865949A (en) * | 1993-03-03 | 1999-02-02 | Valtion Teknillinen Tutkimuskeskus | Process for preparing and treating mechanical pulp with an enzyme preparation having cellobiohydralase and endo-β-glucanase activity |
US5770012A (en) * | 1994-11-18 | 1998-06-23 | P. H. Glatfelter Co. | Process for treating paper machine stock containing bleached hardwood pulp with an enzyme mixture to reduce vessel element picking |
US5725732A (en) * | 1994-11-18 | 1998-03-10 | P. H. Glatfelter Company | Process for treating hardwood pulp with an enzyme mixture to reduce vessel element picking |
WO1997040194A1 (en) * | 1996-04-25 | 1997-10-30 | Union Camp Corporation | Improved method for biological pretreatment of wood chips |
US6939437B1 (en) | 1999-11-19 | 2005-09-06 | Buckman Laboratories International, Inc. | Paper making processes using enzyme and polymer combinations |
WO2004022842A1 (en) * | 2002-09-06 | 2004-03-18 | Stora Enso Aktiebolag | A method of producing mechanical pulp and the mechanical pulp thus produced |
WO2005056915A1 (en) * | 2003-12-11 | 2005-06-23 | Valtion Teknillinen Tutkimuskeskus | Process for preparing mechanical pulp |
CN1997791B (en) * | 2004-05-03 | 2011-01-26 | 纸、纸板和纤维素工业技术中心 | Method for mechanical pulp production |
WO2005106110A1 (en) * | 2004-05-03 | 2005-11-10 | Centre Technique De L'industrie Des Papiers, Cartons Et Celluloses | Method for mechanical pulp production |
US8945347B2 (en) | 2004-05-03 | 2015-02-03 | Centre Technique De L'industrie Des Papiers, Cartons Et Celluloses | Method for mechanical pulp production |
CN102791923A (en) * | 2009-10-16 | 2012-11-21 | 菲布里亚塞鲁洛斯有限公司 | Process for producing differentiated cellulose fibers comprising an enzymatic treatment in association with an acid step |
CN102791923B (en) * | 2009-10-16 | 2016-05-11 | 菲布里亚塞鲁洛斯有限公司 | Comprise the method for the production fibre in differentiation cellulose fiber of sour step and enzyme processing coupling |
US10519597B2 (en) | 2009-10-16 | 2019-12-31 | Suzano S.A. | Process for producing differentiated cellulose fibers comprising an enzymatic treatment in association with an acid step |
WO2012042146A1 (en) * | 2010-09-30 | 2012-04-05 | Arjo Wiggins Fine Papers Limited | Method for refining, in an enzymatic medium, paper pulp comprising cellulose fibers in order to reduce the length of said fibers |
FR2965570A1 (en) * | 2010-09-30 | 2012-04-06 | Arjo Wiggins Fine Papers Ltd | METHOD FOR THE ENZYMATIC REFINING OF A PAPER PULP COMPRISING CELLULOSIC FIBERS TO REDUCE THEIR LENGTH |
Also Published As
Publication number | Publication date |
---|---|
CA2030836A1 (en) | 1991-05-28 |
NO905134L (en) | 1991-05-28 |
JPH03174079A (en) | 1991-07-29 |
NO905134D0 (en) | 1990-11-27 |
FI895676A (en) | 1991-05-28 |
FI895676A0 (en) | 1989-11-27 |
FI92414B (en) | 1994-07-29 |
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