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| Number | Title | Issue Date |
| 7214291 | Method for the modification of cellulose fibres The invention relates to a method for the modification of cellulose fiber with the object of increasing the strength properties of the pulp. Cellulose derivative, preferably in the form of CMC, is added in association with alkali cooking and/or delignification of ce... | 05/08/2007 |
| 7186316 | Method for preparing pulp from cornstalk Disclosed is a method for preparing paper pulp from cornstalks comprising the steps of cooking, washing, screening, thickening, bleaching, beating and drying performed under moderate conditions which have little noxious effects on the environment. By using cornstalk... | 03/06/2007 |
| 7001484 | Peroxide bleaching of wood pulp using stabilizers and sodium hydrosulfide reducing agent A process for peroxide bleaching of mechanical or high yield pulp, the process comprising adding to a pulp slurry at least one stabilizer for stabilizing low valency states of transition metal ions in the slurry; subsequently adding caustic soda to said slurry simul... | 02/21/2006 |
| 6797113 | Use of thinnings and other low specific gravity wood for lyocell pulps method The use of low specific gravity wood from thinning operations, for example, will produce a lower brownstock viscosity for a given kappa number target. A differential of 200-cP falling ball pulp viscosity has been detected from Kraft cooks of low and high specific gr... | 09/28/2004 |
| 5976321 | Process for making sulfur enhanced undigested cellulosic fiber material and pulp Provided is a process for making pulp having the steps of: contacting an undigested cellulosic fiber material with a pretreatment liquid formulated from a mixture comprising alkali metal bicarbonate and alkali metal hydrogen sulfide as reaction components whic... | 11/02/1999 |
| 5676795 | Process for the production of viscose pulp The present invention relates to a process for producing viscose pulp from lignocelluloses, such as hardwood, softwood or annual plants, in which process the lignocellulose is treated in a digester at first with saturated steam to prehydrolyze hemicellulo... | 10/14/1997 |
| 5587049 | Process for delignifying raw cellulosic material impregnated with monopersulphuric acid A process for delignifying raw cellulose which comprises a preliminary treatment for impregnating raw cellulose with a monopersulphuric acid solution, a successive filtration without washing with recycle of the filtered liquid to the first step, and a tre... | 12/24/1996 |
| 5433825 | Method for pulping wood chips separate alkali and peroxymonosulfate treatments The present invention is directed to a process for pulping of lignocellulosic materials. In the process, the ligoncellulose material is impregnated with an alkaline liquor. The lignocellulose material is maintained in the alkaline liquor for a period of t... | 07/18/1995 |
| 5223091 | Method of brightening mechanical pulp using silicate-free peroxide bleaching A method of brightening mechanical pulps by chelating and thickening to reduce the manganese content of the pulp to less than 30 parts per million and copper content less than 1 parts per million by adding ions preferably magnesium ions as magnesium sulph... | 06/29/1993 |
| 5129987 | Process for bleaching mechanical wood pulp with sodium hydrosulfite and sodium hydroxide in a refiner A paper pulp refining and bleaching process wherein the pulp is treated in one or more refiners with a sodium hydrosulfite bleach liquor in the presence of a strong alkali such as NaOH, whereby the bleaching solution has an alkaline pH, preferably 10 to 1... | 07/14/1992 |
| 4897155 | Method for producing low fines content pulp by subjecting cellulosic chips to low frequency compression-relaxation cycles A method for producing low fines content pulp having successive treatment stages in each of which compressive and shearing forces are applied to the cellulosic fiber while simultaneously one or more chemicals are added. Gradual breakdown of the fibers is ... | 01/30/1990 |
| 4812206 | Process for bleaching lignocellulosic matter A process for bleaching a lignocellulosic matter in the form of a mechanical, thermomechanical, chemicomechanical or chemicothermomechanical papermaking pulp, or of wood chips while being converted into one of these pulp types by processing in a machine c... | 03/14/1989 |
| 4798651 | Process for preparing pulp for paper making This invention relates to an improved process for preparing pulp suitable for paper making. Although processes using explosive decompression have been known in the past, it has been believed that these must be conducted at relatively low temperatures. Alt... | 01/17/1989 |
| 4735683 | Process for preparation of potassium salts from pulp of lignocellulosic materials Described herein is a process for producing potassium salts from potassium-based liquors for pulping of lignocellulosic material. The process comprises the steps of (a) digesting lignocellulosic material with a potassium-base aqueous cooling liquor to obt... | 04/05/1988 |
| 4734162 | Hardwood pulp having a tactile sense of softness, and tissue paper webs thereof Pulps having a tactile sense of softness which are made from hardwoods and processes for making such pulps. The process comprises the steps of: providing hardwood chips having specified sizes; introducing the chips into a digester; removing substantially ... | 03/29/1988 |
| 4690731 | Method of making sulphate pulp A modified batch cooking technique for making sulfate pulp with a high degree of delignification or with a normal degree of delignification but with increased pulp viscosity. This is effected by one or several displacements of the liquor in the digester w... | 09/01/1987 |
| 4634499 | Sulfite process for making pulp having a tactile softness from hardwood chips Pulps having a tactile sense of softness which are made from hardwoods and processes for making such pulps. The process comprises the steps of: providing hardwood chips having specified sizes; introducing the chips into a digester; removing substantially ... | 01/06/1987 |
| 4599138 | Process for pretreating particulate lignocellulosic material to remove heavy metals A process is provided for pretreating particulate lignocellulosic material to remove heavy metals and resin without any delignification or defibration, which comprises washing particulate lignocellulosic material; compressing the washed material to a soli... | 07/08/1986 |
| 4579628 | Process for chlorine bleaching of kraft pulp using a sulfite extraction stage Extraction of chlorine bleached kraft wood pulps with aqueous peracids at pH values of 7 or below, aqueous sulfites at pH values below 10 or with certain non-aqueous solvents provides extracted pulps having lower residual color and permits use of lesser q... | 04/01/1986 |
| 4560437 | Process for delignification of chemical wood pulp using sodium sulphite or bisulphite prior to oxygen-alkali treatment In the delignification of chemical wood pulp with oxygen and alkali a larger reduction of the kappa number may be obtained without an increase in the charge of oxygen or alkali, provided the pulp is pretreated with a solution of sulphite or bisulphite in ... | 12/24/1985 |
| 4486267 | Chemithermomechanical pulping process employing separate alkali and sulfite treatments A high yield chemithermomechanical (CTMP) process for obtaining high strength hardwood pulps is disclosed wherein hardwood chips are subjected to a two-stage chemical treatment prior to defibration, the first consisting of chip impregnation and reaction w... | 12/04/1984 |
| 4307121 | Process for preparing cellulose A process is provided for the processing of certain organic agricultural foodstuff by-products normally having little commercial value to produce a cellulosic product suitable for human consumption or use in various products. The process of the present in... | 12/22/1981 |
| 4260452 | Production of paper pulp from sugar mill bagasse Paper pulp is produced by a process in which raw sugar mill bagasse is moist depithed, wet bulk stored in the presence of an inorganic and organic preservative, wet depithed by hydraulic shearing in the presence of an inorganic color remover, pulped, wash... | 04/07/1981 |
| 4259147 | Pulping process A versatile process and apparatus is presented for producing, in high yields, many different grades of pulp from a single wood specie or for pulping any specie or type of woody material, and for storage and recycling of the by-product liquid and gaseous m... | 03/31/1981 |
| 4230524 | Method for the production of unbleached sulphite cellulose or bleached cellulose from a defibrated knot pulp Knots separated from sulphite cellulose produced by a sulphite cellulose cooking process are converted to unbleached sulphite cellulose by first separating and defibrating the sulphite knots and then treating the defibrated sulphite knots with oxygen unde... | 10/28/1980 |
| 4199399 | Method for preparing bagasse dissolving pulps and producing rayon having a degree of polymerization of at least 800 therefrom A dissolving pulp suitable for preparing rayon having a degree of polymerization of greater than about 800 can be produced using bagasse by a sodium hydroxide-sodium sulfite digestion at a ph of about 10.5 to 11.5 and preferably about 10.8 to 11.2 and a c... | 04/22/1980 |
| 4187141 | Method of producing bleached mechanical pulp Method of producing mechanical pulp of improved brightness and light-scattering properties in a defibration apparatus in which wood chips are ground between a pair of discs which rotate relative to one another in a pressurized grinding zone. Prior to the ... | 02/05/1980 |
| 4153502 | Process for the production of polysulphide pulping liquor from pulp mill recovery smelt Sodium polysulphide is formed by reacting sodium sulphide and sodium sulphur-oxygen salts in the presence of carbon and oxygen. The invention is particularly applicable to reacting recovery furnace smelt from a polysulphide pulping process to form a mixtu... | 05/08/1979 |
| 4141786 | Manganic ion delignification of lignocellulosic material A process for delignifying lignocellulosic pulps, which comprises the steps of (a) impregnating a lignocellulosic pulp slurry with a water-soluble manganous salt having a manganous ion concentration of from about 1% to about 10%, by weight of oven-dried p... | 02/27/1979 |
| 4116758 | Method of producing high yield chemimechanical pulps A process for producing high yield chemimechanical pulps from woody lignocellulosic material, such as wood chips, whereby the material is treated with an aqueous solution of a mixture of sulfite and bisulfite, said solution being of sufficient strength to... | 09/26/1978 |
| 4106979 | Preparation of paper pulps from dicotyledonous plants Paper pulp is prepared from dicotyledonous plants by stirring said plants in an alkaline solution in the presence of a surfactant and stain inhibiting agent to obtain a stock containing a woody core fraction and a bark fraction containing bast fibers, sep... | 08/15/1978 |
| 4087318 | Oxygen-alkali delignification of lignocellulosic material in the presence of a manganese compound A process is provided for the delignification of lignocellulosic material wherein the lignocellulosic material, prior to the delignification, is treated with water or an aqueous solution to remove compounds which catalyze the degradation of carbohydrates ... | 05/02/1978 |
| 4070233 | Process of the pulping of bleaching of vegetable material A pulping process which includes the steps of oxidizing vegetable materials with an oxidizing chemical selected from the group comprising Cl2, Cl2 O,ClO.sub. 2, Mg(ClO)2, Mg(ClO2)2 Mg.(ClO.sub. 3) | 01/24/1978 |
| 4070232 | Prehydrolysis and digestion of plant material Plant material containing hemicellulose and lignin is prehydrolyzed in the presence of steam and the vapors of a dilute acid solution having a pH of 1.5-3.5 at a temperature of 105° C to 135° C for 7-20 minutes to hydrolyze the hemicellulose into pentos... | 01/24/1978 |
| 4067768 | Alkaline pulping of lignocellulosic material with amine and sulfate pretreatment A method is described for increasing the yield of pulp obtained from an alkaline pulping process. A lignocellulosic material, such as wood chips, is first pretreated with an aqueous solution containing from 0.1 to 10% by weight of monoethanolamine, methyl... | 01/10/1978 |
| 4036681 | Delignification of lignocellulosic material with an alkaline pulping liquor containing a Diels Alder adduct of benzoquinone or naphthoquinone Delignification of lignocellulosic material, such as wood, straw or bagasse, by treatment with an alkaline pulping liquor containing a diketo hydroanthracene selected from the unsubstituted and lower alkyl substituted Diels Alder adducts of benzoquinone a... | 07/19/1977 |
| 3998688 | Method for the production of cellulose fibers using a two-step pre-treatment A process for the preparation of cellulose fibers from cellulose containing chips wherein the cellulose containing chips are subjected to a chemical process for the purpose of separating the cellulose from lignin and other extraneous chemicals which prior... | 12/21/1976 |
| 3981765 | Treatment of wood chips with an alkali metal borohydride solution followed by mechanical defibration A chemi-mechanical process for producing unbleached pulp with improved yields at high brightness including impregnating a lignocellulosic material in the form of wood chips with an alkaline solution containing an alkali metal borohydride in an amount over... | 09/21/1976 |
| 3975232 | Three stage process for pulping lignocellulosic materials including a cyanide ion containing first stage A three stage process for pulping lignocellulosic materials, preferably softwood chips comprising: as a first stage treating the lignocellulosic material with a cyanide ion-containing solution at a pH between 7 and 12 to form cyanohydrin groups; in a seco... | 08/17/1976 |
| 3969184 | Digestion odor control The invention relates to a continuous method of making cellulosic pulp from wood chips within a range of yield from 65 to 90 per cent by digestion with a digestion liquor containing Na2 S and Na2 CO3. The digestion is effe... | 07/13/1976 |
