CA2030836A1 - Procedure for the production of pulp - Google Patents
Procedure for the production of pulpInfo
- Publication number
- CA2030836A1 CA2030836A1 CA 2030836 CA2030836A CA2030836A1 CA 2030836 A1 CA2030836 A1 CA 2030836A1 CA 2030836 CA2030836 CA 2030836 CA 2030836 A CA2030836 A CA 2030836A CA 2030836 A1 CA2030836 A1 CA 2030836A1
- Authority
- CA
- Canada
- Prior art keywords
- enzyme
- production
- energy consumption
- pulp
- 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.)
- Abandoned
Links
- 238000000034 method Methods 0.000 title claims abstract description 17
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 13
- 108090000790 Enzymes Proteins 0.000 claims abstract description 31
- 102000004190 Enzymes Human genes 0.000 claims abstract description 31
- 229920001131 Pulp (paper) Polymers 0.000 claims abstract description 13
- 239000000126 substance Substances 0.000 claims abstract description 13
- 238000011282 treatment Methods 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
- 239000001913 cellulose Substances 0.000 claims abstract description 8
- 229920002488 Hemicellulose Polymers 0.000 claims abstract description 6
- 230000033116 oxidation-reduction process Effects 0.000 claims abstract description 5
- 229940088598 enzyme Drugs 0.000 claims description 27
- 239000000203 mixture Substances 0.000 claims description 16
- 229920002678 cellulose Polymers 0.000 claims description 7
- 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 15
- 229940106135 cellulose Drugs 0.000 abstract 1
- 235000010980 cellulose Nutrition 0.000 abstract 1
- 239000002023 wood Substances 0.000 description 8
- 241000233866 Fungi Species 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 101710121765 Endo-1,4-beta-xylanase Proteins 0.000 description 2
- 239000000835 fiber Substances 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
- 241000228212 Aspergillus Species 0.000 description 1
- 241000894006 Bacteria Species 0.000 description 1
- 241000218657 Picea Species 0.000 description 1
- 241000223259 Trichoderma 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
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
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
(57) ABSTRACT OF DISCLOSURE
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 cellu-lose in the fibrous product. When hydro-lytic 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 en-zyme treatment also improves the strength properties and the blue reflectance fac-tor of the pulp.
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 cellu-lose in the fibrous product. When hydro-lytic 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 en-zyme treatment also improves the strength properties and the blue reflectance fac-tor of the pulp.
Description
2~3~836 PROCEDURE FOR THE PRODUCTION OF PULP
The present invention relates to a procedure for the pro-duction 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 gPnerating frictional heat which softens the wood so that individual fibres can be released.
Traditionally, mechanical pulp is produced either by grind-ing 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 (C~MP) 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 e:ither 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 ~rom its present level. The invention is characterized in that the fibrous product is subjected to an en7yme treat-ment in which an enzyme acts on the hemicellulose andtor cellulose in the fibrous product. When the fibrous product is treated e.g. with the en~ymes produced by the fungi 2 ~
Aspergillus or T~ichoderma (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 sub-jected to enzyme treatment may be either whole wood, wood chips, or pulp refined one or more times. ~lowever, 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 struc-ture 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, cellu-lase, 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 tem-perature range of the enzyme treatment may be 10-90C, pre-ferably 40-70~C, and the pH range 2.0-10.0, preferably 4.0-8Ø Hydrolytic enzymes such as hemicellulase, cellu-lase, pectinase, esterase allow a large redox potential of the order of approx. -50 - 500 mV. However, it is prefer-able to adjust the redox potential using suitable oxida-tion-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 axe 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.
~ID3083~
Example 1.
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 per-formed 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 deter-mine the freeness value (CSF), Eibre distribution, fibre length and shives content. In addition, 2 circulation water sheet was produced from each sample and analyzed to deter-mine its density, tensile index, tear index, light scatter-ing 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) illustrat-ing 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:
~1~3~3~
The pulp was not subjected to an ~nzyme 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 treat~ent 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.
It is obvious to a person skilled in the art that the invention is not restricted to the embodiment described above, but that it may instead be varied within the scope of the following claims.
.
UNTREATED PULP ¦ ENZYME-TREATED PULP
Degree of Energy ¦ Degree of Energy refintng consumption I refining consumption (CSF) (MJ/kg) ¦ (CSF) (MJ/kg) I
400 1 ~00 3.12 ¦ 1.95 1.95 1 2.07 Total 5.07 ¦ Total 4.02
The present invention relates to a procedure for the pro-duction 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 gPnerating frictional heat which softens the wood so that individual fibres can be released.
Traditionally, mechanical pulp is produced either by grind-ing 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 (C~MP) 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 e:ither 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 ~rom its present level. The invention is characterized in that the fibrous product is subjected to an en7yme treat-ment in which an enzyme acts on the hemicellulose andtor cellulose in the fibrous product. When the fibrous product is treated e.g. with the en~ymes produced by the fungi 2 ~
Aspergillus or T~ichoderma (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 sub-jected to enzyme treatment may be either whole wood, wood chips, or pulp refined one or more times. ~lowever, 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 struc-ture 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, cellu-lase, 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 tem-perature range of the enzyme treatment may be 10-90C, pre-ferably 40-70~C, and the pH range 2.0-10.0, preferably 4.0-8Ø Hydrolytic enzymes such as hemicellulase, cellu-lase, pectinase, esterase allow a large redox potential of the order of approx. -50 - 500 mV. However, it is prefer-able to adjust the redox potential using suitable oxida-tion-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 axe 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.
~ID3083~
Example 1.
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 per-formed 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 deter-mine the freeness value (CSF), Eibre distribution, fibre length and shives content. In addition, 2 circulation water sheet was produced from each sample and analyzed to deter-mine its density, tensile index, tear index, light scatter-ing 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) illustrat-ing 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:
~1~3~3~
The pulp was not subjected to an ~nzyme 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 treat~ent 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.
It is obvious to a person skilled in the art that the invention is not restricted to the embodiment described above, but that it may instead be varied within the scope of the following claims.
.
UNTREATED PULP ¦ ENZYME-TREATED PULP
Degree of Energy ¦ Degree of Energy refintng consumption I refining consumption (CSF) (MJ/kg) ¦ (CSF) (MJ/kg) I
400 1 ~00 3.12 ¦ 1.95 1.95 1 2.07 Total 5.07 ¦ Total 4.02
Claims (13)
1. Procedure for the production of mechanical pulp from a fibrous product, c h a r a c t e r i z e d 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.
2. Procedure according to claim 1, c h a r a c t e r -i z e d in that a hydrolytic enzyme acts on the hemicellu-lose and/or cellulose in the fibrous product.
3. Procedure according to claim 1 or 2, c h a r a c -t e r i z e d in that, when hydrolytic enzymes are used, the redox potential is adjusted by means of suitable oxidation-reduction chemicals.
4. Procedure according to any of the preceding claims, c h a r a c t e r i z e d in that the hydrolytic enzyme used is preferably hemicellulase, cellulase, esterase, pectinase or a mixture of these .
5. Procedure according to any of the preceding claims, c h a r a c t e r i z e d 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.
6. Procedure according to any of the preceding claims, c h a r a c t e r i z e d 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.
7. Procedure according to any of the preceding claims, c h a r a c t e r i z e d in that the enzyme treatment takes place within a temperature range of 10-90°C, prefer-ably 40-75°C, and within a pH range of 2.0-10.0, preferably 4.0-8Ø
8. Use of enzymes acting on hemicellulose and/or cellulose to reduce the energy consumption in the production of mechanical pulp.
9. Use of an enzyme according to claim 8 to reduce the energy consumption in the production of mechanical pulp when hydrolytic enzymes are use.
10. 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.
11. 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, use either by themselves or in mixtures.
12. Use of a reduction chemical according to claim 10 to reduce the energy consumption in the production of mech-anical pulp, the reduction chemicals being gaseous nitrogen or oxygen, antioxidants, sugars or sugar derivatives, organic acids or inorganic salts, use either by themselves or in mixtures.
13. 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 |
|---|---|
| CA2030836A1 true CA2030836A1 (en) | 1991-05-28 |
Family
ID=8529431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2030836 Abandoned CA2030836A1 (en) | 1989-11-27 | 1990-11-26 | Procedure for the production of 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 (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6939437B1 (en) | 1999-11-19 | 2005-09-06 | Buckman Laboratories International, Inc. | Paper making processes using enzyme and polymer combinations |
| US9127401B2 (en) | 2013-01-31 | 2015-09-08 | University Of New Brunswick | Wood pulp treatment |
| US9145640B2 (en) | 2013-01-31 | 2015-09-29 | University Of New Brunswick | Enzymatic treatment of wood chips |
Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04240287A (en) * | 1991-01-21 | 1992-08-27 | Kobe Steel Ltd | Bleaching of pulp |
| FI93230C (en) * | 1991-03-22 | 1995-03-10 | Genencor Int Europ | Method for reducing resin difficulties in mechanical pulp |
| FI914780A0 (en) * | 1991-10-10 | 1991-10-10 | Valtion Teknillinen | FOERFARANDE FOER ENTSYMATISK BEHANDLING AV LIGNOCELLULOSAHALTIGA MATERIAL, I SYNNERHET CELLULOSAMASSOR. |
| CA2082185C (en) * | 1991-11-26 | 2004-01-20 | Alexander R. Pokora | Protease catalyzed treatments of lignocellulose materials |
| FI97733C (en) * | 1992-07-17 | 1997-02-10 | Metsae Serla Oy | A new way of handling mechanical pulps |
| FI92500C (en) * | 1993-03-03 | 1994-11-25 | Valtion Teknillinen | Process for producing mechanical pulp |
| 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 |
| WO1997040194A1 (en) * | 1996-04-25 | 1997-10-30 | Union Camp Corporation | Improved method for biological pretreatment of wood chips |
| SE525872C2 (en) * | 2002-09-06 | 2005-05-17 | Stora Enso Ab | Method of producing mechanical pulp with reduced energy consumption |
| FI20031818A (en) * | 2003-12-11 | 2005-06-12 | Valtion Teknillinen | Manufacture of mechanical pulp |
| WO2005106110A1 (en) * | 2004-05-03 | 2005-11-10 | Centre Technique De L'industrie Des Papiers, Cartons Et Celluloses | Method for mechanical pulp production |
| CA2777801C (en) | 2009-10-16 | 2017-05-02 | Aracruz Celulose S.A. | Differentiated cellulosic fibres from an enzymatic treatment having an acid step |
| FR2965570B1 (en) * | 2010-09-30 | 2012-11-02 | Arjo Wiggins Fine Papers Ltd | METHOD FOR THE ENZYMATIC REFINING OF A PAPER PULP COMPRISING CELLULOSIC FIBERS TO REDUCE THEIR LENGTH |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2557894B1 (en) * | 1984-01-10 | 1986-12-12 | Centre Tech Ind Papier | PROCESS FOR THE TREATMENT OF PAPER PULP WITH A FIBRILLATION ENZYMATIC SOLUTION AND PULPES THUS PROCESSED. |
| DE3636208A1 (en) * | 1986-10-24 | 1988-05-05 | Call Hans Peter | METHOD FOR DELIGNIFYING AND WHICH BLEACHING LIGNICELLULOSE-CONTAINING OR LIGNINAL MATERIAL OR LIGNIN BY ENZYMATIC TREATMENT |
| FI81394C (en) * | 1988-07-22 | 1993-07-20 | Genencor Int Europ | FOERFARANDE FOER BEHANDLING AV MASSA MED ENZYMER |
-
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 JP JP32133990A patent/JPH03174079A/en active Pending
- 1990-11-27 NO NO90905134A patent/NO905134L/en unknown
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6939437B1 (en) | 1999-11-19 | 2005-09-06 | Buckman Laboratories International, Inc. | Paper making processes using enzyme and polymer combinations |
| US9127401B2 (en) | 2013-01-31 | 2015-09-08 | University Of New Brunswick | Wood pulp treatment |
| US9145640B2 (en) | 2013-01-31 | 2015-09-29 | University Of New Brunswick | Enzymatic treatment of wood chips |
Also Published As
| Publication number | Publication date |
|---|---|
| NO905134L (en) | 1991-05-28 |
| NO905134D0 (en) | 1990-11-27 |
| EP0430915A1 (en) | 1991-06-05 |
| JPH03174079A (en) | 1991-07-29 |
| FI895676A0 (en) | 1989-11-27 |
| FI895676A (en) | 1991-05-28 |
| FI92414B (en) | 1994-07-29 |
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