CA2030186A1 - Procedure for the production of pulp - Google Patents
Procedure for the production of pulpInfo
- Publication number
- CA2030186A1 CA2030186A1 CA 2030186 CA2030186A CA2030186A1 CA 2030186 A1 CA2030186 A1 CA 2030186A1 CA 2030186 CA2030186 CA 2030186 CA 2030186 A CA2030186 A CA 2030186A CA 2030186 A1 CA2030186 A1 CA 2030186A1
- Authority
- CA
- Canada
- Prior art keywords
- enzyme
- pulp
- process according
- fibrous product
- lignin
- 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 21
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 6
- 108090000790 Enzymes Proteins 0.000 claims abstract description 28
- 102000004190 Enzymes Human genes 0.000 claims abstract description 28
- 230000001590 oxidative effect Effects 0.000 claims abstract description 8
- 229920005610 lignin Polymers 0.000 claims abstract description 7
- 230000033116 oxidation-reduction process Effects 0.000 claims abstract description 7
- 239000000126 substance Substances 0.000 claims abstract description 6
- 229920001131 Pulp (paper) Polymers 0.000 claims description 11
- 239000000203 mixture Substances 0.000 claims description 9
- 239000002023 wood Substances 0.000 claims description 9
- 102000003425 Tyrosinase Human genes 0.000 claims description 5
- 108060008724 Tyrosinase Proteins 0.000 claims description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 4
- 108010059896 Manganese peroxidase Proteins 0.000 claims description 4
- 235000000346 sugar Nutrition 0.000 claims description 4
- 241000222356 Coriolus Species 0.000 claims description 3
- 108010054320 Lignin peroxidase Proteins 0.000 claims description 3
- 239000003963 antioxidant agent Substances 0.000 claims description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 2
- 229910052757 nitrogen Inorganic materials 0.000 claims description 2
- 150000007524 organic acids Chemical class 0.000 claims description 2
- 229910052760 oxygen Inorganic materials 0.000 claims description 2
- 239000001301 oxygen Substances 0.000 claims description 2
- 230000003078 antioxidant effect Effects 0.000 claims 1
- 229910017053 inorganic salt Inorganic materials 0.000 claims 1
- 230000003334 potential effect Effects 0.000 claims 1
- 230000001105 regulatory effect Effects 0.000 claims 1
- 238000007670 refining Methods 0.000 abstract description 15
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 238000007792 addition Methods 0.000 abstract 1
- CIWBSHSKHKDKBQ-JLAZNSOCSA-N Ascorbic acid Chemical compound OC[C@H](O)[C@H]1OC(=O)C(O)=C1O CIWBSHSKHKDKBQ-JLAZNSOCSA-N 0.000 description 8
- 239000000047 product Substances 0.000 description 6
- 108010029541 Laccase Proteins 0.000 description 5
- FAPWRFPIFSIZLT-UHFFFAOYSA-M Sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 4
- 229960005070 ascorbic acid Drugs 0.000 description 4
- 235000010323 ascorbic acid Nutrition 0.000 description 4
- 239000011668 ascorbic acid Substances 0.000 description 4
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- 239000000835 fiber Substances 0.000 description 3
- 239000000523 sample Substances 0.000 description 3
- 241000233866 Fungi Species 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000011541 reaction mixture Substances 0.000 description 2
- 230000035484 reaction time Effects 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000011780 sodium chloride Substances 0.000 description 2
- 239000008399 tap water Substances 0.000 description 2
- 235000020679 tap water Nutrition 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 102100031260 Acyl-coenzyme A thioesterase THEM4 Human genes 0.000 description 1
- AIKKULXCBHRFOS-UHFFFAOYSA-N Formothion Chemical compound COP(=S)(OC)SCC(=O)N(C)C=O AIKKULXCBHRFOS-UHFFFAOYSA-N 0.000 description 1
- 101000638510 Homo sapiens Acyl-coenzyme A thioesterase THEM4 Proteins 0.000 description 1
- 102000003992 Peroxidases Human genes 0.000 description 1
- 241000218657 Picea Species 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 235000006708 antioxidants Nutrition 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
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 229940093915 gynecological organic acid Drugs 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 230000031700 light absorption Effects 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 235000005985 organic acids Nutrition 0.000 description 1
- 108040007629 peroxidase activity proteins Proteins 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000001954 sterilising effect Effects 0.000 description 1
- 238000004659 sterilization and disinfection Methods 0.000 description 1
- 150000008163 sugars Chemical class 0.000 description 1
Classifications
-
- 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
-
- 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
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biochemistry (AREA)
- Microbiology (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Paper (AREA)
Abstract
ABSTRACT OF DISCLOSURE
Disclosed is a procedure for the production of mechani-cal pulp from a fibrous product. To reduce a refining energy, the fibrous product is subjected to an enzyme treament in which an en-zyme acts on lignin in the fibrous product. When oxidizing en-zymes are used, it is preferable to adjust the redox potential to the optimum level characteristic of each oxidation-reduction en-zyme by means of suitable oxidation-reduction chemicals. In addi-tion to reducing the refining energy consumption, the enzyme treatment also improves the strength properties and the blue reflectance factor of the pulp.
Disclosed is a procedure for the production of mechani-cal pulp from a fibrous product. To reduce a refining energy, the fibrous product is subjected to an enzyme treament in which an en-zyme acts on lignin in the fibrous product. When oxidizing en-zymes are used, it is preferable to adjust the redox potential to the optimum level characteristic of each oxidation-reduction en-zyme by means of suitable oxidation-reduction chemicals. In addi-tion to reducing the refining energy consumption, the enzyme treatment also improves the strength properties and the blue reflectance factor of the pulp.
Description
203~J'~
PROCEDURE FOR THE PRO~UCTION OF PULP
The present invention relates to a process for the pro~
duction of mechanical pulp from a fibrous product.
The production of mechanical pulp from a fibrous pro-duct, 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 generat-ing frictional heat which softens the wood so that individualfibres 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 more advanced versions of the refining method, heat (TMP, ~hermomechanical pulp) and possibly also chemi-cals ~CTMP~ are used. Moreover, it has recently ~een established that the energy consumption in the defibration and reining of wood can be reduced by allowing white-rot fungi to act either on ~0 wood chips or on pulp produced by a single refining operation.
However, this method has the disadvantaye that the required reac-tion time is several days, sometimes even weeks. Besides, the reaction requires sterile conditionsO These circumstances are an obstacle to large-scale and economical utilization of the method.
An object of the present invention is to create a solu-tion that allows the refining energy requirement to be reduced ,'3 $~
~ 2 - 74131-1 from its present level~ According to the invention, the fibrous product is subjected to an enxyme treatment in which an enzyme acts on lignin in the fibrous product. When the fibrous product is treated with en~ymes acting on lignin, generated e.g. by white-rot fungi, in the presence of suitable deoxidants, antioxidants or salts, a reduction in the refining energy is achieved even if a short reaction time i5 used, and no sterilization o~ the raw mat-erial 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. ~owever, the enzyme action re-quires a good contact with as large a fibre area as possible.
The purpose of the en~me treatment is to modify the structure of the lignin in the fibres ih 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 an oxidizing enzyme and adjusting the redox pstential with a suitable oxidation-reduction chemical. The enzyme to be used is pre~erably phenoloxidase, lignin peroxidase, manganese peroxidase or a mixture of these. A most suitable enz~me is phenoloxidase or laccase produced by white-rot fungus Coriolus versiculum. ~he temperature range of the en2yme treatment may he 10-90~, prefer-ably 40-70C, and the pH range 2.0-10.a preferably 4.0-8Ø When oxidizing enzymes such as phenoloxidase, li~nin peroxidase and manganese peroxidase are used, it is preferable to adjust the redox potential to the optimum level characteristic of each oxidation-reduction enzyme by means of suitable oxidation-reduction chemicals or redox regulators, e.g. gaseou~ nitrogen or oxygen, antio~idants, sugars or sugar derivatives, organic acids or inorganic salts, used either by themselves or in mixtures.
In the following, the invention is described in detail by the aid of examples of embodiments based on laboratory tests.
Example 1.
2000 g of once-refined TMP spruce wood pulp was elutri-ated in tap water so that the mixture obtained had a consistencyof 2.9% By adding Coriolus versiculum laccase enzyme to the . . . _ _ .
mi~ture, a misture with a lacasse activity of 0.5 ~/ml and an initial redox potential of approx. 100mV as measured against the Ptelectrode was obtained. The temperature of the mixture during the enzyme treatment was 20 C and the treating time was 30 min.
After the enzyme treatment, sodium hydroxide ~in an amount of 4% of the dry matter of the mixture) was added to the mixture. The mixture was then stirred manually for 30 min., whereupon it was concentrated, centrifugalized, homogenized and frozen.
The pulp was refined in a Sprout ~ldron d 30 cm refiner with a diminishing blade distance~ The refining energy was mea-sured, whereupon a sample of 200 g (average) was taken. The sam-ple was analyzed to determine its freeness value (C5F), fibre dis-tribution, fibre length and shives content. In addition, a 3 ~i ~ ~ ~ 74131--1 circulation water sheet was produced from the sample and analyzed to determine its density, tensile index, tear index, light scat-tering coefficient, light absorption coefficient and blue reflec~
tance factor.
Tables 1 and 2 show the results of the analytical tests reflecting the refining result and the quality of the pulp. In addition to the above-described test (test 3) illustrating the in-vention, two reference tests (tests 1 and 2) and two additional tests (tests 4 and 5) were carried out. The results of these tests are also presented in Table 1 below. The tests were performed as follows:
rrest 1 (rePerence test): No enzyme treatment and no water treatm~nt of the pulp was carried out before refining.
Neith~r was the pulp subjected to an alkali treatment. The refining and analyses were performed as above (test 3).
Test 2 treference test): No enzyme treatment of the pulp was performed, but the pulp was treated with tap water in conditions corresponding to those of the enzyme txeatment in test 3. In all other respects, the treatment corre-sponded to that described above (test 3).
Test 4: The pulp was subjected to an enzyme treatment in which the reaction mixture contained ascorbic acid in an amount of 0.3 g/l. Otherwise the test corresponded to that described above (test 33. The procedure represented by this test is within the scope of the present invention.
Test 5: The pulp was subjected to an enzyme treatment in which the reaction mixture contained ascorbic acid in an amount of 0.3 g/l and 10 mM of sodium chloride. Otherwise the test corresponded to that described above ~test 3). The procedure represented by this test is within the scope of the present invention.
It can be seen from the results that the refining energy can be reduced during the first refining operation if once-refined l'MP pulp is subjected to an enzyme treatment as provided by the invention.
It can also be seen that the the blue reflectance factor and certain strength properties 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.
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TABI.E 2 Untreated ¦ Pulp with ¦ Pulp with ¦ Pulp with pulp ¦ laccase ¦ laccase and ¦ laccase, ¦ ¦ ascorbic acid ¦ ascorbic acid ¦ and NaCl ~' CSF E ¦ CSF E ¦ CSF E ¦ CSF E
MJ/kg ¦ MJ/kg ¦ MJ/kg I MJ/kg . _ I . . . I ~ .. . :
410 1 410 1 410 ¦ 410 1.35 ¦ 1.27 ¦ 1.35 1 1.16 330 ¦ 320 ¦ 315 ¦ 315 , ... I
E = refining energy CSF = freeness
PROCEDURE FOR THE PRO~UCTION OF PULP
The present invention relates to a process for the pro~
duction of mechanical pulp from a fibrous product.
The production of mechanical pulp from a fibrous pro-duct, 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 generat-ing frictional heat which softens the wood so that individualfibres 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 more advanced versions of the refining method, heat (TMP, ~hermomechanical pulp) and possibly also chemi-cals ~CTMP~ are used. Moreover, it has recently ~een established that the energy consumption in the defibration and reining of wood can be reduced by allowing white-rot fungi to act either on ~0 wood chips or on pulp produced by a single refining operation.
However, this method has the disadvantaye that the required reac-tion time is several days, sometimes even weeks. Besides, the reaction requires sterile conditionsO These circumstances are an obstacle to large-scale and economical utilization of the method.
An object of the present invention is to create a solu-tion that allows the refining energy requirement to be reduced ,'3 $~
~ 2 - 74131-1 from its present level~ According to the invention, the fibrous product is subjected to an enxyme treatment in which an enzyme acts on lignin in the fibrous product. When the fibrous product is treated with en~ymes acting on lignin, generated e.g. by white-rot fungi, in the presence of suitable deoxidants, antioxidants or salts, a reduction in the refining energy is achieved even if a short reaction time i5 used, and no sterilization o~ the raw mat-erial 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. ~owever, the enzyme action re-quires a good contact with as large a fibre area as possible.
The purpose of the en~me treatment is to modify the structure of the lignin in the fibres ih 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 an oxidizing enzyme and adjusting the redox pstential with a suitable oxidation-reduction chemical. The enzyme to be used is pre~erably phenoloxidase, lignin peroxidase, manganese peroxidase or a mixture of these. A most suitable enz~me is phenoloxidase or laccase produced by white-rot fungus Coriolus versiculum. ~he temperature range of the en2yme treatment may he 10-90~, prefer-ably 40-70C, and the pH range 2.0-10.a preferably 4.0-8Ø When oxidizing enzymes such as phenoloxidase, li~nin peroxidase and manganese peroxidase are used, it is preferable to adjust the redox potential to the optimum level characteristic of each oxidation-reduction enzyme by means of suitable oxidation-reduction chemicals or redox regulators, e.g. gaseou~ nitrogen or oxygen, antio~idants, sugars or sugar derivatives, organic acids or inorganic salts, used either by themselves or in mixtures.
In the following, the invention is described in detail by the aid of examples of embodiments based on laboratory tests.
Example 1.
2000 g of once-refined TMP spruce wood pulp was elutri-ated in tap water so that the mixture obtained had a consistencyof 2.9% By adding Coriolus versiculum laccase enzyme to the . . . _ _ .
mi~ture, a misture with a lacasse activity of 0.5 ~/ml and an initial redox potential of approx. 100mV as measured against the Ptelectrode was obtained. The temperature of the mixture during the enzyme treatment was 20 C and the treating time was 30 min.
After the enzyme treatment, sodium hydroxide ~in an amount of 4% of the dry matter of the mixture) was added to the mixture. The mixture was then stirred manually for 30 min., whereupon it was concentrated, centrifugalized, homogenized and frozen.
The pulp was refined in a Sprout ~ldron d 30 cm refiner with a diminishing blade distance~ The refining energy was mea-sured, whereupon a sample of 200 g (average) was taken. The sam-ple was analyzed to determine its freeness value (C5F), fibre dis-tribution, fibre length and shives content. In addition, a 3 ~i ~ ~ ~ 74131--1 circulation water sheet was produced from the sample and analyzed to determine its density, tensile index, tear index, light scat-tering coefficient, light absorption coefficient and blue reflec~
tance factor.
Tables 1 and 2 show the results of the analytical tests reflecting the refining result and the quality of the pulp. In addition to the above-described test (test 3) illustrating the in-vention, two reference tests (tests 1 and 2) and two additional tests (tests 4 and 5) were carried out. The results of these tests are also presented in Table 1 below. The tests were performed as follows:
rrest 1 (rePerence test): No enzyme treatment and no water treatm~nt of the pulp was carried out before refining.
Neith~r was the pulp subjected to an alkali treatment. The refining and analyses were performed as above (test 3).
Test 2 treference test): No enzyme treatment of the pulp was performed, but the pulp was treated with tap water in conditions corresponding to those of the enzyme txeatment in test 3. In all other respects, the treatment corre-sponded to that described above (test 3).
Test 4: The pulp was subjected to an enzyme treatment in which the reaction mixture contained ascorbic acid in an amount of 0.3 g/l. Otherwise the test corresponded to that described above (test 33. The procedure represented by this test is within the scope of the present invention.
Test 5: The pulp was subjected to an enzyme treatment in which the reaction mixture contained ascorbic acid in an amount of 0.3 g/l and 10 mM of sodium chloride. Otherwise the test corresponded to that described above ~test 3). The procedure represented by this test is within the scope of the present invention.
It can be seen from the results that the refining energy can be reduced during the first refining operation if once-refined l'MP pulp is subjected to an enzyme treatment as provided by the invention.
It can also be seen that the the blue reflectance factor and certain strength properties 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.
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TABI.E 2 Untreated ¦ Pulp with ¦ Pulp with ¦ Pulp with pulp ¦ laccase ¦ laccase and ¦ laccase, ¦ ¦ ascorbic acid ¦ ascorbic acid ¦ and NaCl ~' CSF E ¦ CSF E ¦ CSF E ¦ CSF E
MJ/kg ¦ MJ/kg ¦ MJ/kg I MJ/kg . _ I . . . I ~ .. . :
410 1 410 1 410 ¦ 410 1.35 ¦ 1.27 ¦ 1.35 1 1.16 330 ¦ 320 ¦ 315 ¦ 315 , ... I
E = refining energy CSF = freeness
Claims (9)
1. A process for the production of mechanical pulp from a fibrous product, wherein the fibrous product is subjected to an enzyme treatment in which the enzyme acts on lignin in the fibrous product.
2. The process according to claim 1, wherein the enzyme is an oxidizing enzyme and acts on the lignin in the fibrous product.
3. The process according to claim 2, wherein a redox poten-tial is adjusted by means of an oxidation-reduction regulating chemical.
4. The process according to claim 3, wherein the oxidizing enzyme is a member selected from the group consisting of phenol-oxidase, lignin peroxidase, manganese peroxidase and a mixture of at least two of them; and the oxidation-reduction chemical is a member selected from the group consisting of gaseous nitrogen, gaseous oxygen, an antioxidant, a sugar or sugar derivative, an organic acid, an inorganic salt and a combination of at least two of them.
5. The process according to any of claims 1 to 4, wherein the enzyme treatment is conducted at a temperature of 10 to 90°C, and at a pH of 2.0 to 10Ø
6. A process for the production of mechanical pulp, which comprises:
subjecting raw wood mechanical pulp refined at least one time to a treatment with an oxidizing enzyme capable of acting on lignin contained in the refined pulp, where the enzyme treatment is conducted at a temperature of 10 to 90°C at a pH value of 2.0 to 10.0 while adjusting a redox potential of the enzyme by using a redox regulator.
subjecting raw wood mechanical pulp refined at least one time to a treatment with an oxidizing enzyme capable of acting on lignin contained in the refined pulp, where the enzyme treatment is conducted at a temperature of 10 to 90°C at a pH value of 2.0 to 10.0 while adjusting a redox potential of the enzyme by using a redox regulator.
7. The process according to claim 6, wherein the oxidizing enzyme is a member selected from the group consisting of phenoloxidase, lignin peroxidase, manganese peroxidase and a mixture thereof.
8. The process according to claim 6, wherein the oxidizing enzyme is laccose produced by white-rot fungus Coriolus versiculum
9. The process according to claim 6, 7 or 8, wherein the raw wood pulp is thermomechanical pulp (TMP).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI895501 | 1989-11-17 | ||
| FI895501A FI895501A (en) | 1989-11-17 | 1989-11-17 | FOERFARANDE FOER TILLVERKNING AV MASSA. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2030186A1 true CA2030186A1 (en) | 1991-05-18 |
Family
ID=8529379
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2030186 Abandoned CA2030186A1 (en) | 1989-11-17 | 1990-11-16 | Procedure for the production of pulp |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0429422A1 (en) |
| JP (1) | JPH03174078A (en) |
| CA (1) | CA2030186A1 (en) |
| FI (1) | FI895501A (en) |
| NO (1) | NO904956L (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6267841B1 (en) * | 1992-09-14 | 2001-07-31 | Steven W. Burton | Low energy thermomechanical pulping process using an enzyme treatment between refining zones |
| US6939437B1 (en) | 1999-11-19 | 2005-09-06 | Buckman Laboratories International, Inc. | Paper making processes using enzyme and polymer combinations |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4137761A1 (en) * | 1991-05-17 | 1992-11-19 | Call Hans Peter | METHOD FOR DELIGNIFYING LIGNOCELLULOSE-CONTAINING MATERIAL, BLEACHING AND TREATING WASTEWATER BY LACCASE WITH EXTENDED EFFECTIVENESS |
| CA2082185C (en) * | 1991-11-26 | 2004-01-20 | Alexander R. Pokora | Protease catalyzed treatments of lignocellulose materials |
| DK64092D0 (en) * | 1992-05-18 | 1992-05-18 | Novo Nordisk As | |
| US5785811A (en) * | 1992-11-09 | 1998-07-28 | The Mead Corporation | Process for treating lignocellulosic material with soybean peroxidase in the presence of peroxide |
| ATE169699T1 (en) * | 1993-06-16 | 1998-08-15 | Lignozym Gmbh | METHOD FOR MODIFYING, DEGRADING OR BLEACHING LIGNIN, MATERIALS CONTAINING LIGNIN OR CARBON |
| US5480801A (en) * | 1993-09-17 | 1996-01-02 | Novo Nordisk A/S | Purified PH neutral Rhizoctonia laccases and nucleic acids encoding same |
| ATE212088T1 (en) * | 1993-10-04 | 2002-02-15 | Novozymes As | METHOD FOR PRODUCING LAMINATED CARDBOARD AND CORRUGATED CARDBOARD CENTER PLY |
| JP3970930B2 (en) * | 1996-02-08 | 2007-09-05 | ノボザイムス アクティーゼルスカブ | Method for producing lignocellulosic material and product obtained by the method |
| US6610172B1 (en) | 1999-05-06 | 2003-08-26 | Novozymes A/S | Process for treating pulp with laccase and a mediator to increase paper wet strength |
| CA2372499C (en) * | 1999-05-06 | 2009-10-13 | Novozymes A/S | A process for production of paper materials with improved wet strength |
| DE10126347A1 (en) * | 2001-05-30 | 2002-12-05 | Voith Paper Patent Gmbh | Production of paper/cardboard fibers uses a biological process stage for the wood chips, using a fungus action to give cellulose, which is processed by chemical precipitation reaction and augmented with additives |
| US8282773B2 (en) * | 2007-12-14 | 2012-10-09 | Andritz Inc. | Method and system to enhance fiber development by addition of treatment agent during mechanical pulping |
| US9580454B2 (en) * | 2009-11-13 | 2017-02-28 | Fpinnovations | Biomass fractionation process for bioproducts |
| FR2980805B1 (en) | 2011-09-30 | 2013-09-20 | Arkema France | ENZYMATIC PRETREATMENT OF WOOD IN A PROCESS FOR THE MANUFACTURE OF MECHANICAL PAPER PULP |
| WO2017108431A1 (en) * | 2015-12-22 | 2017-06-29 | Metgen Oy | Method for producing mechanical pulp from a biomass comprising lignocellulosic material |
| CN108442162B (en) * | 2018-04-16 | 2020-08-21 | 福建祥业环保科技股份有限公司 | Crop straw biological pulping method and papermaking pulp |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NZ216726A (en) * | 1985-07-15 | 1990-08-28 | Repligen Corp | Use of lignin-degrading enzymes from phanerochaete chrysosporium for treatment of wood pulp and e1 effluent |
| 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 |
-
1989
- 1989-11-17 FI FI895501A patent/FI895501A/en not_active Application Discontinuation
-
1990
- 1990-11-13 EP EP90850371A patent/EP0429422A1/en not_active Withdrawn
- 1990-11-15 NO NO90904956A patent/NO904956L/en unknown
- 1990-11-16 CA CA 2030186 patent/CA2030186A1/en not_active Abandoned
- 1990-11-16 JP JP30899690A patent/JPH03174078A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6267841B1 (en) * | 1992-09-14 | 2001-07-31 | Steven W. Burton | Low energy thermomechanical pulping process using an enzyme treatment between refining zones |
| US6939437B1 (en) | 1999-11-19 | 2005-09-06 | Buckman Laboratories International, Inc. | Paper making processes using enzyme and polymer combinations |
Also Published As
| Publication number | Publication date |
|---|---|
| FI895501A (en) | 1991-05-18 |
| NO904956D0 (en) | 1990-11-15 |
| JPH03174078A (en) | 1991-07-29 |
| EP0429422A1 (en) | 1991-05-29 |
| FI895501A0 (en) | 1989-11-17 |
| NO904956L (en) | 1991-05-21 |
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