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Class Information
Number: 162/25
Name: Paper making and fiber liberation > Processes of chemical liberation, recovery or purification of natural cellulose or fibrous material > Chemical treatment after start or completion of mechanical defibration > With additional chemical treatment before start of defibration
Description: Processes in which the fibrous material is also subjected to a chemical treatment before the start of the defibering process.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7384502 |
Process for impregnating, refining, and bleaching wood chips having low bleachability to prepare mechanical pulps having high brightness |
Jun. 10, 2008 |
| 7306698 |
Method for producing pulp |
Dec. 11, 2007 |
| 7294227 |
Method and system for the treatment of pulp prior to ozone bleaching |
Nov. 13, 2007 |
| 7229525 |
Methods to enhance pulp bleaching and delignification |
Jun. 12, 2007 |
| 7182836 |
Method for delignifying lignocellulosic raw materials |
Feb. 27, 2007 |
| 7037405 |
Surface treatment with texturized microcrystalline cellulose microfibrils for improved paper and paper board |
May. 2, 2006 |
| 7018509 |
Elimination of alum yellowing of aspen thermomechanical pulp through pulp washing |
Mar. 28, 2006 |
| 7008505 |
Eucalyptus biomechanical pulping process |
Mar. 7, 2006 |
| 7005034 |
Method in connection with the production of mechanical pulp |
Feb. 28, 2006 |
| 6761798 |
Method for forming an Arundo donax paper product |
Jul. 13, 2004 |
| 6632326 |
Modifying method for wood elements |
Oct. 14, 2003 |
| 6419786 |
Method for bleaching wood pulp containing recycled paper |
Jul. 16, 2002 |
| 6409841 |
Process for the production of organic products from diverse biomass sources |
Jun. 25, 2002 |
| 6402887 |
Biopulping industrial wood waste |
Jun. 11, 2002 |
| 6364999 |
Process for producing a wood pulp having reduced pitch content and process and reduced VOC-emissions |
Apr. 2, 2002 |
| 6344108 |
Using a dicarboxylic acid dialkyl ester brightening |
Feb. 5, 2002 |
| 6340408 |
Method of preparation of a fluffed pulp to be used in absorbent products |
Jan. 22, 2002 |
| 6277240 |
Method for continuously pulping cellulosic fibrous material |
Aug. 21, 2001 |
| 6267841 |
Low energy thermomechanical pulping process using an enzyme treatment between refining zones |
Jul. 31, 2001 |
| 6214164 |
Process for pretreating wood chips for pulping |
Apr. 10, 2001 |
| 5879510 |
Light drainability, bulky chemimechanical pulp that has a low shive content and a low fine-material content |
Mar. 9, 1999 |
| 5718802 |
Process for obtaining cellulosic fiber bundles at least 2.5 cm long from plant stalk rind |
Feb. 17, 1998 |
| 5628830 |
Enzymatic hydrolysis of biomass material |
May. 13, 1997 |
| 5622597 |
Process for deinking of recycled paper |
Apr. 22, 1997 |
| 5607546 |
CTMP-process |
Mar. 4, 1997 |
| 5536325 |
Method of treating biomass material |
Jul. 16, 1996 |
| 5366558 |
Method of treating biomass material |
Nov. 22, 1994 |
| 5338402 |
Process for preparing a bleached chemithermomechanical pulp |
Aug. 16, 1994 |
| 5338405 |
Production of fiber pulp by impregnating the lignocellulosic material with an aqueous alcoholic SO.sub.2 solution prior to defibration |
Aug. 16, 1994 |
| 5314583 |
Process for the comminution of materials and plant for carrying out the process |
May. 24, 1994 |
| 5267655 |
Method and apparatus for treating a gas containing aqueous fiber suspension |
Dec. 7, 1993 |
| 5227021 |
Method for producing pulp using medium consistency mixer for defiberizing pulp |
Jul. 13, 1993 |
| 5221357 |
Method of treating biomass material |
Jun. 22, 1993 |
| 5164042 |
Method and plant for producing high-yield pulp from pulp chip material containing lignocellulose |
Nov. 17, 1992 |
| 5129987 |
Process for bleaching mechanical wood pulp with sodium hydrosulfite and sodium hydroxide in a refiner |
Jul. 14, 1992 |
| 4983256 |
Method for the manufacture of a paper pulp for currency use |
Jan. 8, 1991 |
| 4968385 |
Method of preparing a plup using a fluidizing centrifugal pump during impregnation |
Nov. 6, 1990 |
| 4966651 |
Method of paper making using an abrasive refiner for refining bleached thermochemical hardwood pulp |
Oct. 30, 1990 |
| 4941943 |
Process for preparing sodium carboxy-methyl cellulose |
Jul. 17, 1990 |
| 4812206 |
Process for bleaching lignocellulosic matter |
Mar. 14, 1989 |
| 4787959 |
Process for preparing chemical paper pulps by cooking, intermediate grinding and a final alkaline peroxide delignification |
Nov. 29, 1988 |
| 4767499 |
Method for the production of fiber pulp by impregnating lignocellulosic material with a sulphonating agent prior to refining |
Aug. 30, 1988 |
| 4756799 |
Method of manufacturing bleached chemimechanical and semichemical fibre pulp by means of a one-stage impregnation process |
Jul. 12, 1988 |
| 4743338 |
Method of removing air from lignocellulosic material by passing the material through conduit paths of different diameters |
May. 10, 1988 |
| 4699691 |
Thermomechanical digestion process |
Oct. 13, 1987 |
| 4689117 |
Thermomechanical digestion process for enhancing the brightness of cellulose pulp using bleachants |
Aug. 25, 1987 |
| 4634498 |
Method for the production of high density fiberboard |
Jan. 6, 1987 |
| 4599138 |
Process for pretreating particulate lignocellulosic material to remove heavy metals |
Jul. 8, 1986 |
| 4486267 |
Chemithermomechanical pulping process employing separate alkali and sulfite treatments |
Dec. 4, 1984 |
| 4435249 |
Process for the oxygen delignification of pulp mill rejects |
Mar. 6, 1984 |
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