Pulp Or Fibers (in Bulk) Patents (Class 8/156)
  • Patent number: 8888958
    Abstract: A pressure diffuser washer comprising: an outer wall, an inner wall adjacent to the outer wall, the inner wall defining annular baffle chambers between the outer wall and the inner wall, wherein each of the annular baffle chambers is configured to connect to a source of a wash liquid, a reciprocating screen assembly adjacent to the inner wall, the reciprocating screen assembly defining a first annular chamber between the inner wall and the reciprocating screen assembly, an area in the inner wall defining a gap associated with each of the annular baffle chambers, wherein the wash liquid from an annular baffle chamber flows through the gap into the first annular chamber, and an annular baffle screen plate covering the gap, wherein the annular baffle screen plate defines openings sized to prevent rocks and other large particulate debris from entering the annular baffle chambers.
    Type: Grant
    Filed: December 5, 2013
    Date of Patent: November 18, 2014
    Assignee: Andritz Inc.
    Inventors: Grant Bechard, Keith Vogel, Jay Sheerer, Edward James Cummings, Carl Luhrmann
  • Patent number: 7967948
    Abstract: A process for bleaching mechanical wood pulp is provided comprising subjecting the wood pulp to at least one bleaching stage with one or more bleaching agents in the presence of one or more optical brightening agent, wherein the bleaching agents are selected from the group consisting of oxidative bleaching agents other than chlorine based bleaching agents such as chlorine dioxide, elemental chlorine or a combination thereof, reductive bleaching agents or any combination of two or more thereof.
    Type: Grant
    Filed: June 2, 2006
    Date of Patent: June 28, 2011
    Assignee: International Paper Company
    Inventor: Xuan Truong Nguyen
  • Patent number: 7077931
    Abstract: The method is for bleaching cellulose pulp in a bleach line that has at least two bleaching steps. The filtrate distribution is led up through the bleaching line counter-currently to the flow of cellulose pulp established in the bleaching line. A single joint main conduit is used for the bleaching steps. Wash filtrates obtained from the wash steps, used after or before the bleaching step, are led in conduits to branch locations on the train conduit that are positioned downstream of the branch location for drawing off of wash and/or dilution liquor for the wash step in question. All branch points in the joint main conduit are in fluid communication with one another along the main conduit.
    Type: Grant
    Filed: January 13, 2004
    Date of Patent: July 18, 2006
    Assignee: Kvaerner Pulping AB
    Inventors: Vidar Snekkenes, Lennart Gustavsson
  • Patent number: 6868973
    Abstract: The present invention provides a drum type refining or washing apparatus in which the refining or washing efficiency of a pulp suspension or a food suspension is remarkably enhanced by the filtration function of a rotary drum and by the filtrate sucking force of a filtrate receptive cell.
    Type: Grant
    Filed: April 13, 2004
    Date of Patent: March 22, 2005
    Assignee: Sakae Kohki Co., Ltd.
    Inventors: Eiichi Kamo, Nobuyuki Kamo
  • Patent number: 6789285
    Abstract: A method of improving the efficiency of the multistage washing of pulp, wherein the initial washing of a given batch of pulp is carried out using a gradually diluted, recovered filtrate fraction originating from the washing of the preceding batch of pulp as the washing liquid, prior to the final washing of the pulp batch. In the method, the recovered fraction filtrate is kept stored in such a way that the concentration gradient of dissolved substances is maintained until the fraction is used for washing the following batch of pulp. A further object of the invention is a pulp washing plant, wherein the method according to the invention is carried out in a laboratory-scale test washer and applied to industrial pulp washing plant solutions.
    Type: Grant
    Filed: January 17, 2002
    Date of Patent: September 14, 2004
    Assignee: Metso Paper Pori Oy
    Inventor: Pertti Haapamäki
  • Patent number: 6752156
    Abstract: A humidifying cylinder includes a first rotatable cylinder having an inlet end and an outlet end and a plurality of first blades extending substantially radially outwardly from an exterior surface of the first cylinder. The humidifying cylinder further includes a second rotatable cylinder having an inlet end and an outlet end and a plurality of second blades extending substantially radially inwardly from an interior surface of the second cylinder, the second cylinder being substantially coaxial with the first cylinder and the first cylinder being disposed inside of the second cylinder such that the exterior surface of the first cylinder and the interior surface of the second cylinder define an annular space. At least one drive is provided for rotating the first cylinder and the second cylinder. At least one conduit is disposed in the annular space for introducing moisture into the annular space. A method of humidifying material is also disclosed.
    Type: Grant
    Filed: May 14, 2001
    Date of Patent: June 22, 2004
    Assignee: Philip Morris Incorporated
    Inventor: Steven Rohn Wagoner
  • Patent number: 6706876
    Abstract: The present invention is directed to a pulp useful for making lyocell fibers. The pulp has a degree of polymerization from about 300 to about 1000; an alpha cellulose content of less than about 90% and in one instance can be made in a roll form. The degree of polymerization can be modified by acid hydrolysis, steam explosion; or alkaline enzymate degradation.
    Type: Grant
    Filed: September 18, 2001
    Date of Patent: March 16, 2004
    Assignee: Weyerhaeuser Company
    Inventors: Mengkui Luo, Vincent A. Roscelli, Amar N. Neogi
  • Publication number: 20040040678
    Abstract: A method for washing a fibre suspension with washing liquid, in which, in accordance with the invention, the fibre suspension is introduced into an annular treatment channel (24) that has an inlet end (72) and an outlet end (73) and is concentric with an axis of rotation (5) to form an inner annular layer (74), washing liquid simultaneously being introduced into the treatment channel to form an outer layer (75), which surrounds the inner annular layer. The fibre suspension and washing liquid are caused to rotate in the treatment channel whilst moving from said inlet end to said outlet end, fibres in the fibre suspension being caused to move into the outer layer of washing liquid, under the influence of the centripetal force, so that an accept (29), the liquid phase of which completely or mostly consists of washing liquid, is discharged at the outlet end of the treatment channel.
    Type: Application
    Filed: May 22, 2003
    Publication date: March 4, 2004
    Inventors: Rolf Ekholm, Peter Wigarthsson
  • Publication number: 20030111200
    Abstract: Systems, methods, and vessels for reducing the stagnation and non-uniform flow or treatment of solid materials and slurries in vessels. The non-uniform flow or treatment that may characterize the storage or treatment of solid materials in process industries is minimized or eliminated by the introduction of liquid to the bottom heads of the vessels, in particular, the introduction of liquids in regions in the bottom heads where friction and compression cause stagnation in the flow of material. The liquid may be introduced by means of one or more nozzles, for example, one or more evenly-spaced nozzles, and the flow of liquid to each nozzle may be individually controlled. Though the systems, methods, and vessels disclosed may be used in the processing of cellulose materials, aspects of the present invention may be used in any process or materials handling industry application where solid materials or slurries are handled in vessels.
    Type: Application
    Filed: July 16, 2002
    Publication date: June 19, 2003
    Inventors: James Robert Prough, Bruno S. Marcoccia, Louis O. Torregrossa
  • Patent number: 6553593
    Abstract: The problems of non-uniform treatment of paper pulp that may be caused by differential flow velocities within a vessel, channeling, and/or disruption of the pulp flow, are substantially eliminated by providing a non-circular cross-section substantially atmospheric pressure vessel with at least one screen surface, and typically a liquid introducing device. The vessel, screen surface, and liquid introducing device are constructed and positioned with respect to each other so that during the treatment of a pulp slurry the slurry has substantially uniform width in a treatment zone, and there is substantially uniform resistance to the flow of slurry over the screen surface over any particular cross-section of the vessel in the treatment zone, and its consistency varies less than 6% in the treatment zone (e.g. between 8-14%).
    Type: Grant
    Filed: June 13, 2001
    Date of Patent: April 29, 2003
    Inventor: James R. Prough
  • Patent number: 6521094
    Abstract: Device for the washing and dewatering a fibrous suspension, which device incorporates two hollow, circular cylindrical filter drums (1), which filter drums incorporate evacuation chambers inside the filter drums for evacuation of fluid. The filter drums rotate in opposite directions to create a pinch (2) where at least one of the said filter drums (1) is installed in a trough (7,8) which partly encloses the outer surface (3) of the filter drum and which, in the direction of rotation of the filter drum, converges towards the outer surface of the filter drum. At least one pulp inflow chamber (4) is installed at the highest point (1) of one or both of the filter drums each equipped with a trough for the introduction of pulp between the outer surfaces (3) of the filter drum and its trough (7,8) for the formation of a fibrous web.
    Type: Grant
    Filed: September 7, 2001
    Date of Patent: February 18, 2003
    Assignee: Kvaerner Pulping AB
    Inventors: Axel Lamas, Stefan Hansson, Bo Clarstrom, Jesper Karrhammar, Goran Brottgardh
  • Patent number: 6500211
    Abstract: The present invention relates to variant EGIII cellulases that have improved stability and/or performance. The variant cellulases have replacements at sensitive residues to improve stability and/or performance.
    Type: Grant
    Filed: February 13, 2002
    Date of Patent: December 31, 2002
    Assignee: Genencor International, Inc.
    Inventors: Timothy Fowler, Colin Mitchinson
  • Publication number: 20020148051
    Abstract: A treatment method for a wooden material can significantly suppress changes in color of the wooden material caused by exposure to light or heat. The treatment method includes steps of subjecting a wooden material to the bleaching treatment and to an acetylating treatment.
    Type: Application
    Filed: December 3, 2001
    Publication date: October 17, 2002
    Applicant: Yamaha Corporation
    Inventors: Shigetaka Yamamoto, Yoshihisa Maruyama
  • Patent number: 6461473
    Abstract: A process for washing pulp including a dilution step, an extraction step and a subsequent displacement step. The process further includes the steps of: diluting the pulp; passing the diluted pulp to the extraction step; developing a first filtrate from the extraction step; passing the pulp from the extraction step to the displacement step; developing a second filtrate from the displacement step; segregating the first and second filtrates; providing the second filtrate to the dilution step; providing a determined minimum volume of the first filtrate needed for the dilution step; and eliminating the remaining volume of the first filtrate from further use in the washing of the pulp.
    Type: Grant
    Filed: September 23, 1998
    Date of Patent: October 8, 2002
    Assignees: Andritz Oy, GL&V Management Hungary Kft
    Inventors: Harri Qvintus, Pekka Tervola
  • Patent number: 6440272
    Abstract: Process and device for the mixing of suspensions with possibly different natures and/or compositions in the stable section of a paper machine. In the process, a suspension, particularly of the backwater of the paper machine, is piped in a mixing tube with the main flow direction in the longitudinal direction of the tube, and additional suspensions, with possibly different solid content, are injected. In the device, a mixing device and piping carry the suspension in the stable section of a paper or cardboard machine and blend suspensions with a higher solid content into a first suspension with little or no solid content. The mixing device and piping include a tube, at least one inlet for the first suspension, a plurality of feeds for the higher solid content suspensions to be admixed, and one outlet for the blended suspension, with a new solid content, arranged downstream from a bend in the tube.
    Type: Grant
    Filed: July 3, 2000
    Date of Patent: August 27, 2002
    Assignee: Voith Sulzer Papiertechnik Patent GmbH
    Inventors: Erwin Binder, Karl-Heinz Beuermann
  • Patent number: 6440265
    Abstract: An improved hood enclosure for isolating wood pulp washing equipment from the ambient environment. The hood has a pair of end members, a pair of skirts along each side to connect to the end member together, and an upper spine also connected at each end to the end members. A pair of clamshell style doors are mounted to the spine along longitudinal hinge lines and are opened vertically. A plurality of access doors are positioned within the skirts, and a plurality of spray or shower pipes penetrate the hood through an end panel to deliver wash liquid to the internal wash drums positioned within the wash vat. Several sealing methods are incorporated to provide sealable access for the access doors, the clamshell doors, and access to the interior of the washing vat for the shower pipes. The clamshell doors abut a peripheral neoprene sealing gasket and are held against the gasket by their own weight.
    Type: Grant
    Filed: January 25, 2000
    Date of Patent: August 27, 2002
    Assignee: Bonded Fiberglass Company
    Inventor: Brian Judd
  • Patent number: 6339859
    Abstract: An adjustable splitter valve and control system for a pulp washing apparatus is provided that automatically regulates the filtrate flow from a pulp washer or thickener to control the filtrate characteristics such as volume, dissolved solids or suspended solids. By detecting or sensing a control parameter in the discharge piping and utilizing a feedback loop, the system will adjust the filtrate split to compensate for variations in the machine operation and feed stock.
    Type: Grant
    Filed: June 25, 1999
    Date of Patent: January 22, 2002
    Inventors: Lewis D. Shackford, John E. Leddy
  • Publication number: 20020004951
    Abstract: According to the invention, a metal salt and an oxygen source are applied to penetrate or impregnate a suitable substrate sequentially in effective amounts so as to react in contact with the substrate and produce a mineral compound fixed within the surface of the substrate. The inventive combination of a mutually compatible metal salt, oxygen source, and substrate brings about an in situ reaction, and modifies the substrate to bring about a lasting desired effect. The mineral compound that is produced according to the invention is linked to the substrate, is stable and long-lasting or permanent, and is immobilized or insolubilized in the substrate. The mineral compound is bound or contained within and on the surface of the substrate, so it may be said to be ingrained in the fibers or matrix of the substrate, or embedded within the substrate. The desired effect is preferably a color. A wide variety of metal salts may be used depending on the desired effect.
    Type: Application
    Filed: August 21, 2001
    Publication date: January 17, 2002
    Inventor: Stephen B. Auger
  • Patent number: 6302996
    Abstract: The invention relates to a method of washing a fiber pulp mixture, in which method the fiber pulp mixture is fed between two filter wires running in the same direction. There is a convergent dewatering space in the direction of travel of the wires, where water is removed from the pulp. According to the idea of the invention, the thickness of the pulp layer being fed between the wires is adjusted during operation, since the ash and fines content of the washed fiber pulp is essentially dependent on the basis weight of the fiber web being washed. In a preferred embodiment of the invention, the height of the slice at the output end of the dewatering space is adjusted. The essential idea of another preferred embodiment of the invention is that the speed of the wires is adjusted. The invention also relates to an arrangement comprising means for adjusting the thickness of the pulp layer being fed between the wires, i.e. the basis weight of the fiber web being washed.
    Type: Grant
    Filed: July 21, 2000
    Date of Patent: October 16, 2001
    Assignee: Metso Paper, Inc.
    Inventor: Vesa Juutinen
  • Patent number: 6272710
    Abstract: The problems of non-uniform treatment of paper pulp that may be caused by differential flow velocities within a vessel, channeling, and/or disruption of the pulp flow, are substantially eliminated by providing a non-circular cross-section substantially atmospheric pressure vessel with at least one screen surface, and typically a liquid introducing device. The vessel, screen surface, and liquid introducing device are constructed and positioned with respect to each other so that during the treatment of a pulp slurry the slurry has substantially uniform width in a treatment zone, and there is substantially uniform resistance to the flow of slurry over the screen surface over any particular cross-section of the vessel in the treatment zone, and its consistency varies less than 6% in the treatment zone (e.g. between 8-14%).
    Type: Grant
    Filed: May 6, 1999
    Date of Patent: August 14, 2001
    Inventor: James R. Prough
  • Patent number: 6200417
    Abstract: Process and device for the mixing of suspensions with possibly different natures and/or compositions in the stable section of a paper machine. In the process, a suspension, particularly of the backwater of the paper machine, is piped in a mixing tube with the main flow direction in the longitudinal direction of the tube, and additional suspensions, with possibly different solid content, are injected. In the device, a mixing device and piping carry the suspension in the stable section of a paper or cardboard machine and blend suspensions with a higher solid content into a first suspension with little or no solid content. The mixing device and piping include a tube, at least one inlet for the first suspension, a plurality of feeds for the higher solid content suspensions to be admixed, and one outlet for the blended suspension, with a new solid content, arranged downstream from a bend in the tube.
    Type: Grant
    Filed: June 28, 1999
    Date of Patent: March 13, 2001
    Assignee: Voith Sulzer Papiertechnik Patent GmbH
    Inventors: Erwin Binder, Karl-Heinz Beuermann
  • Patent number: 6074436
    Abstract: A method for imparting soil resistance to unscoured carpets, and a carpet treated in accordance with the method, are provided. In accordance with the method, a substrate comprising unscoured carpet fibers is treated with a salt of a polycarboxylic acid. The treated substrate is found to have enhanced water and oil repellency in both heat cured and room temperature drying conditions.
    Type: Grant
    Filed: May 13, 1998
    Date of Patent: June 13, 2000
    Assignee: 3M Innovative Properties Company
    Inventors: Shou-Lu G. Wang, Irvin F. Dunsmore, Robert F. Kamrath, John C. Chang
  • Patent number: 6017416
    Abstract: An improved hood enclosure for isolating wood pulp washing equipment from the ambient environment. The hood has a pair of end members, a pair of skirts along each side to connect to the end member together, and an upper spine also connected at each end to the end members. A pair of clamshell style doors are mounted to the spine along longitudinal hinge lines and are opened vertically. A plurality of access doors are positioned within the skirts, and a plurality of spray or shower pipes penetrate the hood through an end panel to deliver wash liquid to the internal wash drums positioned within the wash vat. Several sealing methods are incorporated to provide sealable access for the access doors, the clamshell doors, and access to the interior of the washing vat for the shower pipes. The clamshell doors abut a peripheral neoprene sealing gasket and are held against the gasket by their own weight.
    Type: Grant
    Filed: December 4, 1997
    Date of Patent: January 25, 2000
    Assignee: Bonded Fiberglass Co.
    Inventor: Brian Judd
  • Patent number: 5960500
    Abstract: The apparatus is a washer, thickener and classifier for recovering solids from liquids including a truncated conical screen with walls typically sixty degrees from the horizontal and formed of filter media. Stock sprayer assemblies rotate about a longitudinal axis of said conical screen and direct stock, particularly deink paper stock, onto the walls of the conical screen. Wash fluid sprayer assemblies, including high impact shower nozzles, direct wash fluid onto the stock on the walls of the conical screen. The wash fluid cleans the stock, with the unwanted solids and contaminants passing through the conical screen to the discharge pipes. The wash fluid similarly washes the cleaned stock through the exit formed at the truncated portion formed at the apex of the conical screen for subsequent processing.
    Type: Grant
    Filed: August 11, 1998
    Date of Patent: October 5, 1999
    Assignee: Thermo Fibertek Inc.
    Inventor: Joseph A. Bolton
  • Patent number: 5954841
    Abstract: The present invention provides an improved method for scouring wool. The method comprises differential heating of grease contaminants in the unscoured wool to at least partially liquefy the grease, absorbing the grease by the addition of a grease-absorbing material, and separating the grease-absorbing material from the wool. The method of the invention involves substantially less water consumption than current methods and is a more efficient means of producing wool.
    Type: Grant
    Filed: July 15, 1998
    Date of Patent: September 21, 1999
    Assignee: Primary Applications Limited
    Inventor: Peter William Beven
  • Patent number: 5842242
    Abstract: A single roll wash press comprising a housing and a drum rotatably mounted within the housing. The drum includes a perforated outer wall and a longitudinally extending centerline axis and is rotatable about the axis. The press further comprises a means for receiving a flow of pulp having an initial consistency ranging from about 2% o.d. to about 6% o.d. such that the pulp flows in the direction of drum rotation, and a means for defining a divergent formation zone and for forming a mat of the pulp on the drum within the divergent formation zone. The means for defining and forming comprises a first arcuate portion of the housing with the formation zone being divergent between upstream and downstream ends thereof. The upstream end of the divergent formation zone communicates with the means for receiving the flow of the pulp. The press further includes a means for washing the pulp mat within a displacement zone disposed downstream of the extraction zone.
    Type: Grant
    Filed: November 12, 1997
    Date of Patent: December 1, 1998
    Assignee: Beloit Technologies, Inc.
    Inventor: John S. Antkowiak
  • Patent number: 5839142
    Abstract: The apparatus is a washer, thickener and classifier for recovering solids from liquids including a truncated conical screen with walls typically sixty degrees from the horizontal and formed of filter media. Stock sprayer assemblies rotate about a longitudinal axis of said conical screen and direct stock, particularly deink paper stock, onto the walls of the conical screen. Wash fluid sprayer assemblies, including high impact shower nozzles, direct wash fluid onto the stock on the walls of the conical screen. The wash fluid cleans the stock, with the unwanted solids and contaminants passing through the conical screen to the discharge pipes. The wash fluid similarly washes the cleaned stock through the exit formed at the truncated portion formed at the apex of the conical screen for subsequent processing.
    Type: Grant
    Filed: July 9, 1996
    Date of Patent: November 24, 1998
    Assignee: Thermo Fibertek Inc.
    Inventor: Joseph A. Bolton
  • Patent number: 5837009
    Abstract: A method for cotton purification is described, where the cotton is subject to a purification process in water. The process solution contains calcium hydroxide and a non-ionic detergent wetting agent. Following this processing the cotton is rendered hydrophilic. The cotton is carried in a net with simultaneous removal of the adsorbed processing solution. It is then washed and bleached with H.sub.2 O.sub.2 or ClONa in a two-stage process. The effluent water is processed by anaerobic digestion in the thermophilic region for the production of biogas. The effluent water from the anaerobic digestion process is further processed by aerobic biological treatment. The whole process operates with energy self-sufficiency without resulting in environment pollution. Finally, a high purity cotton is produced with high water absorptivity which is suitable for spinning for the production of quality cotton yarns suitable for weaving quality fabrics or dyeing.
    Type: Grant
    Filed: July 19, 1996
    Date of Patent: November 17, 1998
    Assignee: Innoval Management Limited
    Inventor: George N. Valkanas
  • Patent number: 5771718
    Abstract: The present invention provides a concentrated washing machine having a rotatable cylindrical drum made of punched metal. The drum has an inner surface lined with wire mesh and the drum is housed within a case body. A handle-shaped end plate, which is equipped with radial ribs, is provided at one end of the cylindrical drum. The other end of the cylindrical drum is open. The end plate has a wire mesh lining and is equipped with a suitable number of vanes. Extending into the open end of the cylindrical drum are: a wire mesh cleaning nozzle; a paper stock charge pipe for spraying onto the vanes; a pipe with numerous holes for spraying cleaning water onto the vanes, and a replenishment wetting water pipe. The handle-shaped end plate equipped with radial ribs and a wire mesh lining is provided at one end of the drum to increase the filter area and thereby improve the washing efficiency. The vanes agitate the paper stock by rotational movement to greatly improve the washing efficiency.
    Type: Grant
    Filed: March 12, 1996
    Date of Patent: June 30, 1998
    Assignee: Kabushiki Kaisha Taizen
    Inventors: Tetsuo Ide, Takefumi Ide
  • Patent number: 5741399
    Abstract: In a pulp washing method which employs a dilution stage, followed by an extraction stage, and followed, in turn by a dilution stage, filtrates from the extraction stage and the displacement stage are segregated so that at least a part of the filtrate from the extraction stage may be removed from the pulp washing.
    Type: Grant
    Filed: June 24, 1996
    Date of Patent: April 21, 1998
    Assignee: Beloit Technologies, Inc.
    Inventor: John S. Antkowiak
  • Patent number: 5699573
    Abstract: In the pulp washing machine and method therefor, pulp to be washed is fed between the rotating drum and the pressing roll inside it, so that pulp passes along a spiral-formed track around the pressing roll, being thereby pressed several times. Washing liquid is fed to the pulp at one or several points along its track of movement, between the pressings and/or at the pressing position. Washing thus takes place partly as a diffusion and partly as a displacement washing process. Washing is efficient and reduces the breaking of pulp fibers down to a minimum.
    Type: Grant
    Filed: June 30, 1995
    Date of Patent: December 23, 1997
    Assignee: Finbark Oy
    Inventor: Timo Tapio Saalasti
  • Patent number: 5688369
    Abstract: The invention relates to a method and a device for feeding out fiber pulp over an overflow rim (2) at the upper end of a cylindrical container (1), through which the pulp, which is suspended in liquid, is being fed continuously from the bottom and upwards. The distinguishing features are that the pulp is diluted at a level below the upper surface of the pulp by means of a multiplicity of diluting nozzles (15A-D), which extend downwards in the pulp and which are rotated around the vertical center line (12) of the container, and that the pulp, which has been fed upwards through the container, and the diluting liquid are mixed with each other to form an essentially homogeneous suspension with the aid of rotating scraper elements (14A-D) which extend downwards in the surface layer of the suspension and, at the same time as they are homogenizing the mixture, feed the suspension outwards towards, and finally over, the overflow rim.
    Type: Grant
    Filed: May 23, 1996
    Date of Patent: November 18, 1997
    Assignee: Kvaerner Pulping Aktiebolag
    Inventors: Lars Landmark, Mikael Nilsson
  • Patent number: 5688759
    Abstract: Nitrogen-free anionic conditioning formulations containing sulfated polyol fatty acid esters corresponding to formula (I): ##STR1## in which R.sup.1 CO is a linear or branched, saturated or unsaturated acyl radical containing 6 to 22 carbon atoms, R.sup.2 represents hydrogen, an OCR.sup.1 group or an SO.sub.3 X group, R.sup.3 is hydrogen or an (OCH.sub.2 CH.sub.2).sub.m OR.sup.2 group, n is 0 or a number of 1 to 5, m is 0 or a number of 1 to 10, and X is an alkali metal, alkaline earth metal, ammonium, alkylammonium, alkanolammonium or glucammonium ion.
    Type: Grant
    Filed: March 22, 1996
    Date of Patent: November 18, 1997
    Assignee: Henkel Kommanditgesellschaft auf Aktien
    Inventors: Ansgar Behler, Gunther Uphues, Bernd Wahle
  • Patent number: 5556508
    Abstract: A method for washing a fibre suspension including the steps of feeding the suspension into an annular displacement space, supplying a fluid through a permeable outer surface of the space, rotating the space to establish a fibre layer between the fluid supplied through the permeable outer surface of the displacement space and a remaining part of the fibre suspension.
    Type: Grant
    Filed: September 30, 1994
    Date of Patent: September 17, 1996
    Assignee: Kvaerner Pulping Technologies Aktiebolag
    Inventors: Rolf Ekholm, Ulf Jansson
  • Patent number: 5509161
    Abstract: The procedure for impregnating a woven or non-woven, knit, fiber sheet with an aqueous liquid, in particular of the kind containing a treatment agent, is characterized in that it consists of: (i) depositing the sheet 6 on a liquid-permeable, endless cloth 4, (ii) pouring by gravity the liquid in the form of a curtain or lamina onto the sheet and transversely to the direction of advance of this sheet, (iii) generating by means of a vacuum slit 13 mounted underneath the cloth sufficient pressure drop that at least part of said liquid shall pass through the sheet, the rate of poured liquid as defined in relation to the weight of the sheet moving underneath said curtain exceeding a specific value beyond which the entrainment rate is a function of said pressure drop but independent of the amount poured so as to make possible homogeneous impregnation and easy control of the entrainment rate.
    Type: Grant
    Filed: December 9, 1992
    Date of Patent: April 23, 1996
    Assignee: Kaysersberg
    Inventors: Jean-Louis Neveu, Didier Dumas
  • Patent number: 5444884
    Abstract: A pressure diffuser is constructed so that the compression of pulp that normally occurs during rapid movement of the screen assembly does not significantly degrade the efficiency of the washing (or other treatment liquid) action in the diffuser. This is accomplished by providing at least two headers, including a first vertical header and flow control assembly for one or more sets of horizontal treatment liquid conduits adjacent the pulp inlet to the diffuser, and a second vertical header and flow control assembly for one or more horizontal treatment liquid conduits remote from the pulp inlet. The first and second vertical headers may comprise a common pipe with a flow preventer precluding flow between them, or distinct pipes supplied with treatment liquid by a common pump. The advantageous results are further achieved by providing at least one ring [mounted between the outer screen and the concentric inner support cylinder of the screen assembly] with a plurality of rapid-flow restricting openings.
    Type: Grant
    Filed: July 15, 1994
    Date of Patent: August 29, 1995
    Assignee: Kamyr, Inc.
    Inventor: Marco F. Marois
  • Patent number: 5238501
    Abstract: The invention relates to a method and device for the washing of a medium consistency fibrous slurry, especially a chemical pulp slurry in which the slurry is fed at an inclined angle onto a substantially horizontal portion of circulating filter belt, and then distributed over substantially the entire working width of the filter belt. The distributed slurry is then washed with a washing liquid under localized pressure to produce a slurry having a medium consistency range, i.e., about 8 to 15 percent. In order to increase the consistency to 20 to 40 weight percent, preferably about 30 to about 35 weight percent, the washed slurry is passed to a pressing zone.
    Type: Grant
    Filed: June 29, 1990
    Date of Patent: August 24, 1993
    Assignee: Maschinenfabrik Andritz Aktiengesellschaft
    Inventors: Johannes Kappel, Franz Petschauer
  • Patent number: 5221434
    Abstract: A method and apparatus for the treating of fiber suspensions in the pulp and paper industry and particularly to a method and apparatus for washing fiber suspensions.The method is characterized in that the fiber suspension is fed into the treatment apparatus, the desired process is carried out and the suspension is discharged from the apparatus in such a way that the fiber suspension is fed directly from the pipework to the treatment ducts mounted between the end plates of the rotational parts of the washer thus forming substantially extensions of the pipework. The fiber suspension is treated in the ducts and thereafter the treated suspension is discharged from the ducts by feeding yet untreated suspension to the apparatus.The apparatus includes a plurality of axially elongated treatment ducts (9) arranged in the form of a ring around an axis of rotation. The ducts are radially limited by filter surfaces (10, 11) and in the direction of the end walls divided by partition walls (8).
    Type: Grant
    Filed: April 12, 1989
    Date of Patent: June 22, 1993
    Assignee: A. Ahlstrom Corporation
    Inventor: Kaj Henricson
  • Patent number: 5203045
    Abstract: Nozzle breakage in an atmospheric diffuser for treating paper pulp is precluded by mounting the nozzle to the rotating scraper arm by a connection which will break when the nozzle is subjected to a drag force of about 50% of the force that will break the nozzle. The connection preferably includes a pivot connection of a nozzle extension at one side of the arm, and a shear pin connection of the extension at the end opposite the pivot connection. An oblong nozzle is integral with the nozzle extension, with the fluid introducing openings of the nozzle remote from its connection to the extension. The amount of pivotal movement of the nozzle when the shear pin breaks is limited to about 15.degree.-26.degree. so as to prevent the nozzle from contacting an annular extraction screen of the diffuser.
    Type: Grant
    Filed: October 15, 1991
    Date of Patent: April 20, 1993
    Assignee: Kamyr, Inc.
    Inventor: Stefan Golston
  • Patent number: 5183536
    Abstract: In an atmospheric diffuser for the treatment of paper pulp (thickening, bleaching, and/or washing) the flow of backflushing liquid is controlled so as to maximize the effective treatment of the pulp. The pulp passes upwardly in a vessel. A number of annular screen assemblies are provided, with at least one screen associated with each screen assembly. The lower screen includes a barrier wall with a passage in the barrier wall adjacent the bottom end of the screen. Liquid which flows through the screen must flow to the passage in order to be withdrawn from the vessel, as the screen is slowly moved upwardly. When the screen is rapidly moved downwardly to cause backflushing, the backflushing liquid at the top end of the screen is liquid that recently passed through the screen at that point, so the pulp at that point --which is the cleanest along the length of the screen--has a minimal chance of being contaminated.
    Type: Grant
    Filed: March 13, 1992
    Date of Patent: February 2, 1993
    Assignee: Kamyr, Inc.
    Inventors: Joseph Phillips, J. Robert Prough, Victor L. Bilodeau, Brian Greenwood, Ronald Bain, John Weston
  • Patent number: 5129119
    Abstract: The efficiency of a diffuser, for washing or bleaching paper pulp, is enhanced by taking steps to ensure that the approximate upstroke speed is only slightly faster than the pulp upflow velocity, to provide an early warning indication of the tendency of the diffuser screens to plug, and to prevent upward movement of the screen, after completion of a downstroke, uncontrolled by the hydraulic system designed to effect movement. The pressure under the annular screen is sensed and compared to normal static pressure at the elevation of the screen by a D/P cell in a leg, and a computer controls the hydraulic system so that the screen upstroke speed is only slightly faster than the pulp upward speed. Early detection of a tendency to plug is provided by a pressure sensor within the hollow interior of the screen spaced from the screen orifices.
    Type: Grant
    Filed: April 9, 1991
    Date of Patent: July 14, 1992
    Assignee: Glentech Inc.
    Inventor: Michael I. Sherman
  • Patent number: 5116423
    Abstract: The present invention relates to a method and an apparatus for washing pulp according to which method the pulp is supplied onto a movable liquid-pervious support surface to form a substantially continuous layer; and washing liquid is supplied to the pulp layer and passed in several successive washing phases through different areas of the layer in such a way that the washing liquid gradually flows in the opposite direction compared with the flow direction of the pulp layer. According to the invention the washing liquid is divided in two or more partial flows which pass alternately through different washing phases in such a way that the washing liquid which in one phase has passed through the pulp layer flows past at least the washing phase preceding it in the flow direction of the pulp layer. The apparatus of the invention preferably includes a rotating cylinder having a casing surface of which serves as the liquid-pervious support surface for the pulp.
    Type: Grant
    Filed: February 26, 1990
    Date of Patent: May 26, 1992
    Assignee: A. Alhstrom Corporation
    Inventors: Seppo K. Kokkonen, Harri T. Qvintus
  • Patent number: 5114536
    Abstract: The fibers of recycled paper are cleaned by agitating the slurry containing the fibers to maintain the fibers in suspension, and contacting the slurry with wash water to remove ink and other contaminants. The apparatus includes a passageway having screens forming opposite sides of the passageway. Agitators are within the passageway, and create enough turbulence to prevent fibers from settling or agglomerating. Channels adjacent to each screen carry wash water, and pump pressure creates a pressure differential across the screens to cause the wash water to contact the slurry and to be removed from the passageway.
    Type: Grant
    Filed: November 29, 1990
    Date of Patent: May 19, 1992
    Inventor: Martti Y. O. Kangas
  • Patent number: 5112444
    Abstract: A method of treating a pulp suspension in a screening plant of a pulp mill wherein reject impurities are separated from defibered pulp by screening and/or cleaning, the cleaned pulp is thickened to a consistency of from about 10 to about 20%, the impurities are further treated in the screening plant by screening and defibering the accept fiber material for further screening and thickening and further reject impurities are removed from the screening plant after various screening stages, the method including effecting one or both of the pulp screening and cleaning stages in a closed, pressurized space in the screening plant and preventing the access of air to the pulp treated by effecting the thickening stages in a pressurized state and at the initial pressure of one or both of the preceding screening and cleaning stages.
    Type: Grant
    Filed: March 28, 1990
    Date of Patent: May 12, 1992
    Assignee: A. Ahlstrom Corporation
    Inventors: Kaj Henricson, Olavi Pikka
  • Patent number: 5027620
    Abstract: In a paper pulp treating vessel, such as a pulp thickener or diffuser, the screens are backflushed by reciprocating an internal piston utilizing an internally mounted hydraulic cylinder. The screens are supported by conduit arms having a central hub, and the hydraulic cylinder is mounted directly on top of the hub, with the backflushing cylinder mounted below the hub. Hydraulic lines lead from exteriorly of the vessel to the hydraulic cylinder within the vessel, and a sealing conduit is mounted surrounding the hydraulic lines. The sealing conduit extends to a point above the top of the vessel to act as an indicator if hydraulic fluid leaks in the vessel. A flexible bellows is connected between the sealing conduit and the hydraulic cylinder to allow tilting action between the arms and the top of the vessel.
    Type: Grant
    Filed: February 26, 1990
    Date of Patent: July 2, 1991
    Assignee: Kamyr AB
    Inventor: Ole J. Richter
  • Patent number: 5020178
    Abstract: A method of stabilizing pressure and flow conditions in a screening apparatus for treating a pulp is described, the pulp being supplied continuously to the screening apparatus through an inlet and passed through a pulp space along a screen of a screen body and discharged continuously through an outlet, said screen body being moved axially with a forward-going movement during an extraction phase and a backward-going movement during a backflushing phase. The flowrate of the pulp through, and the pressure conditions in, the treating zone of the screening apparatus are controlled by altering the volume at the inlet end and outlet end of the screening apparatus during the movement of the screen body.
    Type: Grant
    Filed: October 18, 1989
    Date of Patent: June 4, 1991
    Assignee: Kamyr AB
    Inventor: Finn Jacobsen
  • Patent number: 4986881
    Abstract: It is desirable to be able to treat medium consistency (e.g. about 8-12% by weight) paper pulp suspensions with treatment liquid (e.g. a wash liquid), and to thicken the pulp to about 30-50% consistency at the same time. A moving (e.g. rotating) channel is defined by a root wall and upstanding side walls--some or all of which are perforated--and treatment liquid is introduced by an arcuately elongated distributor with perforated side walls into the center of the pulp within the channel, filtrate flowing out through the perforated walls. A pivoted wall portion of the stationary housing of the treatment device restricts outflow of the thickened pulp cake from the device, the cake flowing between a doctor blade and the pivoted wall portion.
    Type: Grant
    Filed: June 28, 1989
    Date of Patent: January 22, 1991
    Assignee: Kamyr, Inc.
    Inventor: Erwin D. Funk
  • Patent number: 4976822
    Abstract: The fibers of recycled paper are cleaned by agitating the slurry containing the fibers to maintain the fibers in suspension, and contacting the slurry with wash water to remove ink and other contaminants. The apparatus includes a passageway having screens forming opposite sides of the passageway. Agitators are within the passageway, and create enough turbulence to prevent fibers from settling or agglomerating. Channels adjacent to each screen carry wash water, and pump pressure creates a pressure differential across the screens to cause the wash water to contact the slurry and to be removed from the passageway.
    Type: Grant
    Filed: May 15, 1989
    Date of Patent: December 11, 1990
    Inventor: Martti Y. O. Kangas
  • Patent number: 4919158
    Abstract: The present invention relates to a method and an apparatus for washing pulp according to which method the pulp is supplied onto a movable liquid-pervious support surface (2) to form a substantially continuous layer (7); and washing liquid is supplied to the pulp layer and passed in several successive washing phases through different areas of the layer in such a way that the washing liquid gradually flows in the opposite direction compared with the flow direction of the pulp layer. According to the invention the washing liquid is divided in two or more partial flows which pass alternately through different washing phases in such a way that the washing liquid which in one phase has passed through the pulp layer flows past at least the washing phase preceding it in the flow direction of the pulp layer. The apparatus of the invention preferably comprises a rotating cylinder (1) the casting surface (2) of which serves as the liquid-pervious support surface for the pulp.
    Type: Grant
    Filed: March 20, 1987
    Date of Patent: April 24, 1990
    Assignee: A. Ahlstrom Corporation
    Inventors: Seppo K. Kokkonen, Harri T. Qvintus
  • Patent number: 4908896
    Abstract: A pressure diffuser includes in a liquid-tight pressurized vessel a vertical screen and which screen and vessel wall define first and second interior volumes for transmitting pulp from a pulp inlet to a pulp outlet and receiving displacement (e.g. wash or bleach) liquid transmitted from headers through the pulp. The screen ends have different cross-sectional areas, and quick movement of the screen effects backflushing. The volumes are segregated by a vertical, generally cylindrical, screen. A chamber is provided in communication on opposite sides of a piston therein with the pulp adjacent the pulp inlet and the extracted liquid. By displacing the piston immediately prior to rapidly moving the screen vertically to effect backflushing through the screen, the pulp pressure on the screen is being reduced and at the same time a volume is made available adjacent the pulp inlet in the chamber thus avoiding pressure shocks and compaction of the pulp adjacent the inlet caused by the movement of the screen.
    Type: Grant
    Filed: August 18, 1988
    Date of Patent: March 20, 1990
    Assignee: Kamyr AB
    Inventors: Finn Jacobsen, Ole J. Richter