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| Number | Title | Issue Date |
| 5637192 | Endothermic spent liquor recovery process Resonant tubes of a pulse combustor are immersed in a bed of solid particles in a reaction zone to provide indirect heat from the pulsating combustion gases to the solid particles of the bed. The bed is maintained in an agitated state by a gas or vapor fl... | 06/10/1997 |
| 5637193 | Bleaching and coating a paper web with peroxide and starch A method for bleaching a paper web with peroxide and to a paper surface treatment mixture intended for such a method. According to the invention, peroxide is introduced onto a moving paper web as part of the said mixture, which in addition to the peroxide... | 06/10/1997 |
| 5632859 | Intergral pulp mill and method of constructing an integral mill A mill for the processing and production of wood pulp is contained substantially entirely within a single, integral structure that defines a unitarily-covered space substantially bounding and enclosing the mill. The mill includes a main control room or st... | 05/27/1997 |
| 5630909 | Pulp fluffing gas contactor A guide vane is provided in a pin fluffer to assist in pulp mat retention during fluffing by providing a cyclic lift component to the mat as it passes over the vane thereby also further increasing retention time obtained in the fluffer.... | 05/20/1997 |
| 5626720 | Method for controlling pitch on a papermaking machine A method for the control of pitch in an aqueous system used in pulp or paper making is disclosed which comprises adding to the system, or to the pulp making or paper making machinery, a water soluble polymer derived from (a) an epihalohydrin, a diepoxide ... | 05/06/1997 |
| 5622602 | Apparatus for controlling the degree of paper fiber variation An apparatus for controlling the degree of fiber variations in paper sheet has a formation meter for receiving an image of transmitted light on one side of an area of paper from a light source located on the other side of the area of paper, an image proce... | 04/22/1997 |
| 5620563 | Process for delignification and bleaching of chemical wood pulps with hydrogen peroxide and a dicyandiamide activator A process of delignifying and bleaching a chemical wood pulp with hydrogen peroxide and dicyandiamide as an activator provides a higher degree of delignification and brightness of the pulp and overcomes problems of fiber degradation. The process comprises... | 04/15/1997 |
| 5618386 | Enzymatic bleaching of chemical lignocellulose pulp A process for treating lignocellulose pulp using a preparation containing at least one enzyme that produces a solubilizing action and, potentially, a hemicellulolytic action on lignin. The enzymes are derived from the bacterium Streptomyces viridosporus. ... | 04/08/1997 |
| 5618385 | Method of peroxide bleaching of pulp using a peroxide decomposing inactivator Chlorine dioxide is used to stabilize hydrogen peroxide in bleach liquor at alkaline pH. This is thought to be aided by the destruction of enzymes (especially catalase) produced by bacteria. The method is useful for the reprocessing of pulps, especially w... | 04/08/1997 |
| 5616215 | Method of making paper from pulp treated with lipase and an aluminum salt A process for hydrolysis of water-insoluble esters in the presence of a lipase, at a pH in the range of 3-7 particularly to such a process for hydrolysis of resin in pulp.... | 04/01/1997 |
| 5611889 | Exothermic bleaching of high-yield pulps simultaneously with oxygen and borohydride A process for bleaching high-yield (mechanical or chemi-mechanical) pulps to high brightnesses and low yellownesses (b*) in a single treatment employs di-oxygen gas (O2), alkaline agent and a borohydride. The combined treatment gives brightness... | 03/18/1997 |
| 5609723 | Oxygen bleaching process for cellulocis pulps with a polyhydric alcohol cellulose protector An improved oxygen bleaching process wherein the pulp is bleached in an aqueous organic medium wherein a polyhydric alcohol constitutes between 10 and 70% by weight of the medium to produce a pulp having a viscosity at least 2.5 cp higher than a similar p... | 03/11/1997 |
| 5607545 | Ozone bleaching process utilizing a fluidizing mixer and super-atmospheric pressure Method and apparatus for ozone bleaching a medium consistency cellulosic fiber suspension include feeding the fiber suspension and an ozone in carrier gas stream under pressure into a fluidizing mixer; intimately and uniformly mixing the fiber suspension ... | 03/04/1997 |
| 5607547 | Method for reduced sulfur dioxide formation in refiner bleaching A method for eliminating the formation of sulfur dioxide in a refiner bleaching process is disclosed wherein a selected amount of a carbonate is added to the refiner contents at approximately the same time that sodium dithionite is added.... | 03/04/1997 |
| 5597446 | Method of controlling a position of rotor in a high pressure feeder In an apparatus and method for controlling the position of a rotor in a truncated conical feeder for feeding a feed comprising a lignocellulose material and an alkaline cooking liquor to a pulping digester; the position of the rotor in the feeder is detec... | 01/28/1997 |
| 5597445 | Method for recovering sodium from a spent cooking liquor A method for recovering sodium from a spent cooking liquor used in a kraft pulping process employing sodium hydroxide as a cooking agent resulting in the presence of sodium and sulfur combined with various elements in the spent cooking liquor. Black liquo... | 01/28/1997 |
| 5591304 | Method for the use of enzymes in bleaching paper pulp A method and apparatus for treating wood pulp that includes incompletely washed brownstock, in which the brownstock is treated at a pH range of approximately 7.0 to 9.0 with a hemicellulase enzyme preparation that has a pH optimum below 6.0. Also, a metho... | 01/07/1997 |
| 5591308 | Wood pulp reactor An oxygen delignification method and apparatus in which a charge of heated wood pulp is reacted with oxygen in the presence of a charge of caustic soda in a plurality of reaction stages located between mixing stages in which caustic is mixed with the wood... | 01/07/1997 |
| 5589032 | Process for preparing a bleaching liquor containing percarboxylic acid and caro's acid A process for treating a substrate, e.g., lignocellulosic pulp or cellulosic pulps with a mixed peracid solution comprising percarboxylic acid and Caro's acid which results in a higher conversion rate of the active oxygen in the hydrogen peroxide in order... | 12/31/1996 |
| 5589031 | Chlorine dioxide bleaching of chemical pulp A method of bleaching chemical pulp in a sequence comprising at least four bleaching steps with final bleaching in a first and a second chlorine dioxide step. Between the chlorine dioxide steps an alkaline extraction is carried out, and washing takes plac... | 12/31/1996 |
| 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 |
| 5571377 | Process for peroxide bleaching of chemical pulp in a pressurized bleach vessel A process for chlorine-free bleaching of chemical pulp in association with the production thereof, where a suspension of the pulp preferably has a concentration exceeding 8% of cellulose-containing fiber material and where the pulp entering into a bleachi... | 11/05/1996 |
| 5571378 | Process for high-pH metal ion chelation in pulps Process for high pH metal ion chelation in pulps. Extraction and removal of detrimental metal ions and organic solvent extractives prior to delignification and bleaching is carried out on pulp, preferably kraft pulp, at a pH over 5, more preferably a pH o... | 11/05/1996 |
| 5567262 | Two stage pressure diffuser A multi-stage pressure diffuser is provided for treating paper pulp or similar comminuted cellulosic fibrous material. Two different subvolumes are defined within the annular screen of the pressure diffuser by a tubular baffle hung from adjacent the top o... | 10/22/1996 |
| 5567274 | Method of controlling pressurized ozone to a pulp delignification reactor A method and apparatus supply ozone containing gas under superatmospheric pressure to an ozone delignification device. The speed of a water ring compressor is controlled so that it compresses as much ozone gas per unit time at desired superatmospheric pre... | 10/22/1996 |
| 5567279 | Variable stage pressure diffuser Located within the annular screen of the pressure diffuser is a tubular baffle hung from adjacent the top of the vessel. The baffle has two headers disposed on its inner surface, with openings in the tube providing communication between the exterior of th... | 10/22/1996 |
| 5562803 | Sequential bleaching of de-inked paper pulp with sodium bisulfite, dithionite and borohydride Paper pulp, especially recycled paper pulp which has been deinked, is bleached in a synergistic two-stage process first with sodium bisulfite and then with sodium borohydride. The borohydride is preferably added in an aqueous mixture with sodium hydroxide... | 10/08/1996 |
| 5554258 | Flotation process for mechanical pulp using a surface active agent An improved process for bleaching pulps is disclosed in which the unbleached pulp is subject to flotation before bleaching and, if necessary, the circulating water is also purified of interfering compounds by flotation.... | 09/10/1996 |
| 5534115 | Process for preserving the mechanical strength properties of chemical paper pulps Process for preserving the mechanical strength properties of a chemical paper pulp, comprising two treatment stages by means of a peroxidic reagent, with the first stage in an acidic medium and the second stage in an alkaline medium, according to which a ... | 07/09/1996 |
| 5529662 | Method of bleaching cellulosic pulps with ozone and a protective amount of an N-alkylated urea Cellulosic pulps are bleached with ozone in an ozone bleaching stage in an aqueous medium containing an additive in an effective amount not exceeding 5% weight concentration of the aqueous medium. The additive is selected from a group consisting of N-alky... | 06/25/1996 |
| 5529660 | Method of reducing fluorescence in deinked pulp by treating pulp with ozone and a bleaching agent Provided herewith is a process for reducing the fluorescence of pulp fibers. The process comprises contacting the pulp fibers with ozone in two or more stages, with an intermediate washing stage or bleaching stage preferably being conducted in between the... | 06/25/1996 |
| 5525195 | Process for high consistency delignification using a low consistency alkali pretreatment Unbleached pulp is washed with an aqueous alkaline solution in a wash press to substantially uniformly distribute a first amount of alkaline material throughout the pulp. The consistency of the pulp exiting the wash press is above about 18%, preferably be... | 06/11/1996 |
| 5520783 | Apparatus for bleaching high consistency pulp with ozone An apparatus and method for bleaching high consistency lignocellulosic pulp using ozone supplied in an ozone containing gas. The bleaching reactor apparatus according to the invention is a generally cylindrical vessel itself being rotatable or with a rota... | 05/28/1996 |
| 5509999 | Treatment of bleach plant effluents The removal of bleaching chemical-consuming metals from treatment fluids in a cellulose pulp mill is facilitated by treating the pulp in an acidic or neutral stage to dissolve metals, washing or thickening the pulp to produce a filtrate containing dissolv... | 04/23/1996 |
| 5507912 | Kraft pulping process wherein sulphide-rich and sulphide-lean white liquors are generated There is disclosed a process of increasing efficiency in a kraft pulping process that utilizes initial, bulk, and final delignification steps, a recovery boiler, and a caustic treatment step, which allows production of a white liquor stream that is separa... | 04/16/1996 |
| 5503712 | Screening system for fractionating and sizing woodchips A flow management system and process for providing controlled separation and sizing of an incoming flow of wood chips. A flow management screen is provided in the form of a horizontal disk screen having a variable speed drive, with the drive controlled ba... | 04/02/1996 |
| 5500086 | Method for producing pulp from green algae Method for producing pulp by using an alga containing cellulose in the cell wall and having the long algae body with the ratio of length to width being 10 to 200 as an ingredient by giving no special treatment or by giving a simple bleaching treatment to ... | 03/19/1996 |
| 5472572 | Reactor for bleaching high consistency pulp with ozone An apparatus and method for bleaching high consistency lignocellulosic pulp using ozone supplied in an ozone containing gas. The bleaching reactor apparatus according to the invention is a generally cylindrical vessel with a rotatable shaft having radiall... | 12/05/1995 |
| 5472567 | Method of chemically reacting a slurry with a gas A number of different, efficient treatments of slurries and liquid with gas can be provided. A slurry or liquid is introduced into a first end of a vortex. A gas--such as a chemically reactive gas--is introduced from exteriorly of the vortex into contact ... | 12/05/1995 |
| 5470437 | Digester for cooking pulp having staggered screens In a pulp digester for continuous cooking under raised pressure and temperature of fiber material in a vertical digester (1), input of fiber material and cooking liquid takes place at the top of the digester, withdrawal of spent cooking liquor is carried ... | 11/28/1995 |
