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...that Kleenex tissue was originally designed to be a gas mask filter? It was developed at the beginning of World War I to replace cotton, which was then in short supply as a surgical dressing.
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| Number | Title | Issue Date |
| 7390669 | Simultaneous and rapid determination of multiple component concentrations in a Kraft liquor process stream The present invention is a rapid method of determining the concentration of the major components in a chemical stream. The present invention is also a simple, low cost, device of determining the in-situ concentration of the major components in a chemical stream. In ... | 06/24/2008 |
| 7204914 | System and method for controlling a processor including a digester utilizing time-based assessments A system for controlling a processor having at least one sampling port connected to a stage of the processor in order to sample a reactant product from the processor. The system includes a controller configured to control a processing parameter of the processor base... | 04/17/2007 |
| 7074299 | Process for using a phloroglucinol color delta to control blending, deinking and bleaching of groundwood-containing secondary pulp A method of processing papermaking fiber includes characterizing the initial color of the pulp and the color of the pulp after treatment with a phloroglucinol stain. The color response of the pulp to the stain has been found to be a better indicator of processing ne... | 07/11/2006 |
| 6833054 | Method and apparatus for adjusting chemical dosage of pulp processing stage A method and an apparatus for adjusting a chemical dosage of a pulp processing stage. The method comprises measuring a change in a variable in dependence on the chemical dosage and the chemical dosage to be added, and determining a model describing the change in the... | 12/21/2004 |
| 6524437 | Process for peroxide bleaching wherein the concentrations of Mn and Fe are monitored and maintained A process for peroxide bleaching of pulp using magnesium oxide or magnesium hydroxide as a substitute for caustic soda wherein the pulp is bleached in the presence of hydrogen peroxide characterized in that the concentration of ion present in the magnesiu... | 02/25/2003 |
| 6447639 | Process for controlling a digester using real time measurement of moisture content and species of wood An on-line pulp digester control system. More particularly, this invention pertains to a control system which employs real time measurements from ion mobility spectrometry to automatically rapidly and continuously determine the physical and chemical chara... | 09/10/2002 |
| 6361649 | Method for the continuous cooking of chemical pulp A method in connection with continuous cooking of chips, comprising impregnation of the chips with impregnation liquid in an impregnation vessel (3) and cooking of the impregnated chips in a digester (4), the impregnation vessel and the digester being con... | 03/26/2002 |
| 6340410 | Method for delivering a variable flow of hydrogen peroxide to a bleaching vessel A unit (4) consumes hydrogen peroxide at a predetermined concentration C1 and at a rate variable from 0 to D1. The apparatus (1) generates hydrogen peroxide at a concentration C2>C1 and at a rate variable between two values D2 and D3. The generated hydrog... | 01/22/2002 |
| 6245196 | Method and apparatus for pulp yield enhancement The process of the present invention purposefully precipitates a portion of the dissolved lignin onto pulp fibers to improve pulp yield of unbleached pulp. The resulting retention of lignin on the pulp creates an increase in pulp yield. Washing the pulp i... | 06/12/2001 |
| 6238517 | Method for controlling oxygen delignification of pulp Methods of controlling oxygen delignification processes are disclosed including providing chemicals for a first oxygen delignification step, conducting the first oxygen delignification step with the chemicals, conducting a second oxygen delignification st... | 05/29/2001 |
| 6174409 | Method to improve final bleached pulp strength properties by adjusting the CI02:03 ration within a single (D/Z) stage of the bleaching process Methods of bleaching cellulose pulp using chlorine dioxide and ozone in one and the same single stage of a bleaching sequence having a plurality of stages are presented. In its broadest embodiment the method comprises controlling a ratio of chlorine dioxi... | 01/16/2001 |
| 6153050 | Method and system for controlling the addition of bleaching reagents to obtain a substantially constant percentage of pulp delignification across the first bleaching/delignifying stage A method for controlling the addition of bleaching/delignifying reagents to obtain a substantially constant percentage of pulp delignification across the first bleaching stage. The present method allows substantial improvements in bleached pulp quality th... | 11/28/2000 |
| 6123807 | Method for the continuous cooking of pulp This invention relates to a new and improved way of continuously cooking fiber material, wherein temperatures and alkaline levels are controlled to be maintained within specific levels in different zones of the digesting process in order to optimize chemi... | 09/26/2000 |
| 6054019 | Impregnation of fiber material in two subsequent concurrent impregnation zones A method for cooking chips which are impregnated, in a vessel (3), with liquid in first and second concurrent impregnation zones (A, B), impregnation liquid being supplied, in a mixture with steamed chips, through a feeding system to the first impregnatio... | 04/25/2000 |
| 5985097 | Method for suppressing undesired effects of transition and alkaline metal compounds during bleaching A method that solves the problem of suppressing disturbing effects of transition and alkaline earth metal compounds during bleaching of chemically digested lignocellulosic pulp in a sequence with oxygen bleaching prior to oxidative stages with introductio... | 11/16/1999 |
| 5958181 | Continuous cooking with a two-stage cool impregnation A method of treating wood chips allows chemical pulp (e. g. kraft pulp) to be produced having enhanced fiber strength properties. In a first zone or stage the chips are cool impregnated (e. g. a temperature of about 60-120° C.) with a first alkali-contai... | 09/28/1999 |
| 5820830 | Waste recovery and utilization in the kraft recovery process An integrated flue gas treatment and condensing heat exchanger is used to scrub sulfur dioxide from the flue gas produced by a power boiler used in a paper mill operating a kraft process. Sensible and latent heat from the flue gas is recovered and the con... | 10/13/1998 |
| 5820729 | Device and process for dissolving smelt from recovery boilers The invention relates to a device for dissolving smelt chemicals from recovery boilers, a so-called soda smelt dissolver, and to a process for such dissolution using the device. The device is characterized in that it consists of at least two separate diss... | 10/13/1998 |
| 5688367 | Method of monitoring and recovering oxygen-rich gas from ozone bleaching A method and installation for bleaching a lignocellulosic pulp with ozone, while recovering an oxygen-rich gas which may be recycled or re-used. Bleaching of the pulp with ozone is preferably carried out under conditions in which ingress of air is prevent... | 11/18/1997 |
| 5674359 | Continuous cooking of cellulosic fibrous material with cold alkali impregnation The pretreatment of cellulosic fibrous material is adjusted to improve pulp strength. The cellulosic material is initially pretreated with a low temperature alkaline liquid (e.g. 80°-110° C.), and then with a higher temperature (but still below cooking ... | 10/07/1997 |
| 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 |
| 5582684 | Method of determining degree of reduction in a sulfate liquor using IR and UV spectroscopy The invention relates to a method of determining the concentration of sulfide and optionally also of polysulfide in liquors and solutions of smelt deriving from the sulfate process. According to the method, the concentrations are determined by measuring t... | 12/10/1996 |
| 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 |
| 5456799 | Method for controlling activation of lignocellulosic material in the presence of a nitrate containing liquid The method solves the problem of delignifying technical cellulose pulp in a selective manner which will result in very low residual contents of lignin in the pulp and a correspondingly high quantity of lignin dissolved in spent liquors, which are recovere... | 10/10/1995 |
| 5403441 | Method for controlling an ozone bleaching process A method for controlling the gas recycle loop of an ozone bleaching process wherein an ozone generator produces an ozone containing gas from an oxygen containing feed gas and delivers the ozone containing gas to an ozone reactor at a variable flow rate re... | 04/04/1995 |
| 5364505 | Pressurized ozone pulp delignification reactor and a compressor for supplying ozone to the 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... | 11/15/1994 |
| 5306391 | Control of chemical dosage to a pulp slurry A method is disclosed for controlling a desired chemical dosage to a stream of cellulosic pulp heated by the addition of steam wherein the pulp flow rate is determined indirectly by measuring the pulp temperature after steam addition and calculating the p... | 04/26/1994 |
| 5282931 | Determination and control of effective alkali in kraft liquors by IR spectroscopy A direct monitoring and control method is provided for on-line measurement of effective alkali, carbonate, sulfate and thiosulfate concentrations in process liquors for the production of kraft pulp. The control method eliminates frequent sampling, and the... | 02/01/1994 |
| 5207870 | Process and equipment for pretreatment of cellulosic raw material The invention concerns a process for pretreatment of cellulosic chip-formed raw material by impregnation. In the process, first a vacuum treatment is carried out without preceding moistening treatment, and as soon as possible after the vacuum treatment pe... | 05/04/1993 |
| 5203964 | Process for producing cellulose from lignin containing raw materials using an enzyme or microorganism while monitoring and maintaining the redox potential A process and an apparatus capable of removing and/or transforming lignin or its degradation products present in material containing lignocellulose. In the present process, a redox potential is set between 200 and 500 mV by the addition to an acid aqueous... | 04/20/1993 |
| 5192396 | Process for the continuous digestion of cellulosic fiber material A process for the continuous digestion of cellulosic fiber material is described wherein the material is impregnated with liquid in a closed system comprising a concurrent flow zone and a countercurrent flow zone, the liquid in the concurrent flow zone in... | 03/09/1993 |
| 5108655 | Foam monitoring control system This invention relates to a system for monitoring and controlling foam in a liquid tank utilizing a foam level sensing device positioned at a downstream location from a defoaming agent delivery arrangement. The foam level sensing device comprises a float ... | 04/28/1992 |
| 5080755 | Process for the continuous digestion of cellulosic fiber material A process for the continuous digestion of cellulosic fiber material is described wherein the material is impregnated with liquid in a closed system comprising a concurrent flow zone and a countercurrent flow zone, the liquid in the concurrent flow zone in... | 01/14/1992 |
| 5066362 | Extended delignification in pressure diffusers Extended delignification of kraft pulp in a pressure diffuser allows a pulp mill with a digester (e.g. continuous digester) to increase its production capacity without building a new line, or to decrease its demand in its bleach plant, or to increase the ... | 11/19/1991 |
| 5032223 | Procedure for determining and controlling the composition proportions of wood chip mixes in alkaline pulp digestion processes A procedure for determining the composition of a wood chip mix dispensed in alkaline delignifying processes, particularly in sulphate and soda/anthraquinone cooking, with the aid of the monomeric compounds produced in connection with the cooking and disso... | 07/16/1991 |
| 4952276 | Method for measuring the bleaching content of pulp bleaching liquor using a chemiluminescent reagent A method for measuring the chemical content of bleaching liquor within the cellulose pulp industry, in which a sample of the bleaching liquor is brought together with one or more reagents, of which at least one is chemiluminescent so as to result in the e... | 08/28/1990 |
| 4895618 | Method of controlling alkaline pulping process A method of controlling an alkaline pulping process, sulphate pulping in particular. The concentration of the dissolved components as well as the concentration of the recidual cooking chemical are measured. The measurements are carried out by means of an ... | 01/23/1990 |
| 4878998 | Method for controlling peroxide bleaching in a plurality of bleaching stages Method of peroxide bleaching of mechanical, thermomechanical and chemi-mechanical pulp wherein the peroxide bleaching is controlled by addition of a known amount of bleaching chemicals in the first stage which amount is allowed to react under defined cond... | 11/07/1989 |
| 4849052 | Batch digester multi-stage pulping process A multi-stage wood chip cooking process performed in a single digester in a batch type operation. The wood chips to be cooked are introduced into the digester and soaked with a warm black liquor to remove most of the air from the digester and the chips. T... | 07/18/1989 |
| 4840703 | Method for controlling an oxygen bleaching A method for controlling an oxygen-bleaching process of lignocellulosic pulp to a desired degree of delignification. The pulp is passed at a substantially constant temperature into a bleaching reactor wherein the pulp has a substantially constant level at its ... | 06/20/1989 |
