Wood And Similar Natural-fibrous Vegetable Material Patents (Class 241/28)
  • Patent number: 4668339
    Abstract: Ink-bearing secondary fiber feedstocks are mechanically fiberized in a substantially dry state to produce substantially discrete fibers and ink-bearing fines, and the fibers are separated from the fines in a substantially dry state.
    Type: Grant
    Filed: October 28, 1985
    Date of Patent: May 26, 1987
    Assignee: Kimberly-Clark Corporation
    Inventor: Byron R. Terry
  • Patent number: 4664323
    Abstract: A method for feeding a wood batch into a pressure grinder, according to which method the wood batch is first fed into a pressurizable feeding device (9) and thereafter from the feeding device into a continuously pressurized grinding chamber (5) to make contact with a grinding means (3) rotating in the grinding chamber. The wood batch is fed from the feeding device into the grinding chamber essentially in a horizontal plane in the direction of the axis (4) of rotation of the grinding means for maintaining proper order of the wood batch during the feeding operation. In a feeding device for carrying out the method the feeding device (9) is positioned on the side of the grinding chamber (5) so that the bottom (10a) of the feeding pocket (10) formed by the feeding device is essentially in level with the bottom (5a) of the grinding chamber. The feeding device is provided with a pushing means (17) displaceable in the feeding pocket towards the grinding chamber in parallel with the level of the bottom.
    Type: Grant
    Filed: November 16, 1984
    Date of Patent: May 12, 1987
    Assignee: Oy Tampella AB
    Inventors: Juhani Ahonen, Pekka Haikkala, Raimo Pessa
  • Patent number: 4650127
    Abstract: A fiberizer for disintegrating fibrous sheets and a method of fiberizing using a rotor having peripheral teeth arranged within bands which extend transversely around the rotor axis is disclosed. The tooth pattern in each band is circumferentially extending and shaped approximately in a sinusoidal wave on the rotor periphery extending in the direction of rotation, and providing a substantially sinusoidal distribution of impacts against a sheet fed to an anvil in the form of simple harmonic motion along a cross direction impact line adjacent the anvil and thus transversing impacts within adjacent strips of the sheet corresponding to the bands. Individual points along the width of the fibrous sheet are periodically impulsively loaded by the impacts when they are at a period of highest response, i.e.
    Type: Grant
    Filed: January 31, 1985
    Date of Patent: March 17, 1987
    Assignee: Kimberly-Clark Corporation
    Inventors: Fred R. Radwanski, Elizabeth A. Wolfson, James L. Post
  • Patent number: 4635859
    Abstract: A centrifugal grinder with an internal grinding surface and a rotor turning within that surface includes a passage for inserting material axially into the rotor and a pocket to allow the material to contact the internal grinding surface. A spray is provided on the rotor at a location trailing the pocket, to spray liquid against the internal surface and make a slurry with ground material. An element of air-foil shape is mounted on the rotor at a location trailing the spray, the air-foil having a rounded contacting portion juxtaposed against the internal grinding surface, and have the effect of lifting the slurry away from the surface. A scoop trails the foil and has a leading edge juxtaposed against the internal grinding surface, defining a pocket for collecting the scooped-up slurry. A compartment is located axially beyond the grinding surface and a passage allows the scooped up slurry to pass from the pocket of the scoop to the compartment.
    Type: Grant
    Filed: May 29, 1985
    Date of Patent: January 13, 1987
    Assignee: AMCA International Limited
    Inventor: Allan J. Wildey
  • Patent number: 4615767
    Abstract: A method of deinking comprises: (a) mechanically fiberizing a secondary fiber source in a substantially dry state, preferably air dry, thereby producing a fibrous material consisting of substantially discrete fibers and ink-bearing fines: (b) depositing the fibrous material onto a moving screen or wire which retains fibers and allows fines to pass therethrough; and (c) lifting the fibrous material above the screen with upwardly directed forced air and redepositing the material onto the screen, whereby upon re-deposition of the material, additional fines pass through the screen.
    Type: Grant
    Filed: October 25, 1984
    Date of Patent: October 7, 1986
    Assignee: Kimberly-Clark Corporation
    Inventors: Robert M. Miers, Byron R. Terry
  • Patent number: 4614304
    Abstract: A system for mixing and refining pulp in which the raw material is conveyed into a cylindrical drum and propelled therethrough in linear/spiral direction by a co-axial rotor comprising a plurality of mixing/refining elements. The raw material is mixed and refined during the relative rotation between the rotor and the drum in a plurality of co-axially extending grinding areas defined between rotatable grinding elements on the rotor and a facing grinding surface on the interior of the drum while being simultaneously compressed therein and alternately decompressed in areas between the grinding areas. The rotatable elements are adjustably mounted to the rotor so as to vary the spacing between the grinding surface on the interior of the drum and a rotatable grinding surface on the grinding elements, while simultaneously adjusting the material feeding angle of the grinding areas.
    Type: Grant
    Filed: December 4, 1984
    Date of Patent: September 30, 1986
    Assignee: Sunds Defibrator AB
    Inventors: Rolf Reinhall, Johan I. Johansson
  • Patent number: 4606504
    Abstract: A method and apparatus for grinding woodchips into pulp provides an internal grinding surface of circular section defining a cavity in which a rotor rotates. The rotor has a pocket extending to the grinding surface from an inlet spaced inwardly from the grinding surface, and the rotation of the rotor gives rise to centrifugal force urging woodchips against the surface, the woodchips entering at the inlet. The woodchips form a compact plug of material filling the pocket adjacent the surface, and the woodchips are ground to pulp and then removed from the surface to a discharge. A pressure differential is placed across the plug of material in the sense to urge the woodchips in the plug more strongly against the grinding surface, so that the woodchips can press with a satisfactory grinding force against the surface without requiring an excessive rotational speed.
    Type: Grant
    Filed: May 10, 1985
    Date of Patent: August 19, 1986
    Assignee: AMCA International Limited
    Inventor: Allan J. Wildey
  • Patent number: 4595150
    Abstract: A blocking slab for a pulp grinder, which blocking slab comprises a striplike frame to be mounted between a wall of a grinding chamber in the grinder and a grindstone, said frame being parallel to the axle of the grindstone. In order to prevent splinters and chips from getting out of the grinding chamber, the frame is provided with a longitudinal retaining edge facing to the peripherical surface of the grindstone. The retaining edge has at least one longitudinal recess, which is limited by two longitudinal retaining ribs, to prevent splinters and chips from getting out of the gap between the grindstone and the blocking slab.
    Type: Grant
    Filed: March 1, 1984
    Date of Patent: June 17, 1986
    Assignee: Oy Tampella AB
    Inventor: Matti Aario
  • Patent number: 4578147
    Abstract: A process is provided for manufacturing groundwood pulp of uniform quality by maintaining a high and uniform moisture content in the wood in the grinding zone which comprises grinding debarked wood logs or wood chips in a closed pocket grinder under atmospheric or superatmospheric pressure while applying shower water both to the free surfaces of the grindstone and to the grinding zone where the logs or chips are in contact with the grindstone, such as by spraying the water at the end portions of the logs or chip mass, optionally together with applying shower water via the ram plates and a water trap arranged around the lower part of the log pockets, and preferably retaining shower water within the grinding zone by filling with shower water the hollows between the logs or chips located nearest the surface of the grindstone.
    Type: Grant
    Filed: March 1, 1983
    Date of Patent: March 25, 1986
    Assignee: Mo och Domsjo Aktiebolag
    Inventors: Jonas A. I. Lindahl, Gustaf E. Johnsson
  • Patent number: 4578148
    Abstract: A process for manufacturing bleached groundwood pulp of improved and uniform quality, in which debarked wood logs or wood chips are ground in a closed pocket grinder at atmospheric or super-atmospheric pressure, while applying shower water to the free surfaces of the grindstone, and shower water containing bleaching chemicals to the grinding zone where the wood is in contact with the grindstone, i.e.
    Type: Grant
    Filed: November 1, 1984
    Date of Patent: March 25, 1986
    Assignee: Mo och Domsjo Aktiebolag
    Inventor: Jonas A. I. Lindahl
  • Patent number: 4577974
    Abstract: A mixer apparatus, and procedure, for mixing medium consistency (e.g., 6-15%) paper pulp, or like fibrous suspension, minimizes the power necessary to effect fluidization, and minimizes the speed for rotation of the rotor to effect fluidization. This is accomplished by preventing the formation of a shadow behind the rotor ribs as they rotate within the mixer housing, and similarly by preventing the formation of a shadow behind the stationary ribs formed on the housing (and cooperating with the rotating ribs). Such shadows are prevented by providing one wall of each of the ribs--the trailing wall in the direction of rotation of the rotor--so that it is sloped, and fills the volume the shadow would occupy.
    Type: Grant
    Filed: May 4, 1984
    Date of Patent: March 25, 1986
    Assignee: Kamyr, Inc.
    Inventors: J. Robert Prough, Louis O. Torregrossa
  • Patent number: 4572440
    Abstract: A method of and apparatus for forming an air laid, e.g., dry laid, fibrous web comprising the steps of and apparatus for defiberizing wood pulp laps, rolls or bales, preferably in a hammermill; transporting the fibers pneumatically to a forming head, and dispensing said fibers onto a foraminous support means, the aforesaid operations being carried out at conditions of high humidity such that the average fiber moisture content is at least above 2.5% by weight just prior reaching a forming header. In the preferred embodiment air at between about 150.degree. to about 200.degree. F. and having a relative humidity of between about 75 to 95% is introduced to the defiberizer to provide the requisite air moisture content. If desired over large fibers from the forming head may be recycled to the defiberizer. By practicing the invention, electrostatic charges on the fibers are reduced thereby minimizing clumping and ensuring better formation.
    Type: Grant
    Filed: June 18, 1981
    Date of Patent: February 25, 1986
    Assignee: James River-Dixie/Northern, Inc.
    Inventor: Thomas Tao
  • Patent number: 4570862
    Abstract: A plurality of axially spaced and axially resiliently flexible annular refining disks in a refiner working chamber have stock flow equalizing ports through the disks, and the pressure on opposite sides of the disks is balanced as by pressure balancing vanes associated with the ports. The vanes may be mounted on the disks at the ports or may be carried by rotor structure and aligned with the ports.
    Type: Grant
    Filed: September 12, 1983
    Date of Patent: February 18, 1986
    Assignee: Beloit Corporation
    Inventor: Edward C. Kirchner
  • Patent number: 4563243
    Abstract: An apparatus for continuously producing wood pulp from wood shavings comprising a screw which rotates within a hollow cylinder. The hollow interior of the cylinder is divided into a pressure zone and a grinding and bleaching zone, the shavings being subjected to at least partially defibrillation under a high, continuously-increasing pressure in the pressure zone and then being simultaneously further defibrillated and bleached in the grinding and bleaching zone. The grinding and bleaching zone includes a plurality of pin planes, each plane being formed of at least three radially extending pins which project through the wall of the cylinder, the planes being spaced apart along the length of the screw.
    Type: Grant
    Filed: June 25, 1984
    Date of Patent: January 7, 1986
    Assignee: Hermann Berstorff Maschinenbau GmbH
    Inventors: Klaus Koch, Gerhard Syrbius
  • Patent number: 4562969
    Abstract: A process is provided which comprises the steps of:(1) grinding lignocellulosic material to form an aqueous groundwood pulp fiber suspension;(2) screening the groundwood pulp fiber suspension through a coarse screen having screen openings not less that about 5 mm;(3) defibrating lignocellulosic material separated out on the coarse screen;(4) recycling the defibrated lignocellulosic material to the groundwood pulp fiber suspension from the grinding step (1);(5) separating the groundwood pulp fiber suspension from step (2) into (a) an accepts fraction and (b) a rejects fraction, the latter comprising from about 30% up to about 85% by weight of the fiber suspension;(6) screening the rejects fraction 5 (b) of the groundwood pulp fiber suspension through a screen having screen openings of less than about 5 mm;(7) separating the fiber suspension from step (6) into (a) an accepts fraction and (b) a rejects fraction;(8) recycling the rejects fraction 7(b) to the defibrating step (3) and then to the groundwood pulp fi
    Type: Grant
    Filed: March 5, 1984
    Date of Patent: January 7, 1986
    Assignee: Mooch Domsjo Aktiebolag
    Inventor: Jonas A. I. Lindahl
  • Patent number: 4541571
    Abstract: A method of controlling a grinding process in a pocket grinder in which a batch of wood in at least one pocket is pressed against a rotating grindstone by a pressure shoe displaceable in the pocket. At predetermined intervals an apparently produced amount of pulp is calculated at separate measuring points of the grinding stroke of the pressure shoe and the specific energy consumption calculated on the basis of this amount of pulp is compared to a target figure for the specific energy consumption. The batch grinding is adjusted depending on a deviation of the specific energy consumption from the target figure.
    Type: Grant
    Filed: November 9, 1982
    Date of Patent: September 17, 1985
    Assignee: Oy Tampella AB
    Inventors: Anssi Karna, Heikki Liimatainen
  • Patent number: 4533507
    Abstract: Apparatus for forming an air laid, e.g., dry laid, fibrous web comprising apparatus for an defiberizing wood pulp laps, rolls or bales, preferably in a hammermill; transporting the fibers pneumatically to a forming head, and dispensing said fibers onto a foraminous support means, the aforesaid operations being carried out at conditions of high humidity such that the average fiber moisture content is at least above 2.5% by weight just prior to reaching a forming header. In the preferred embodiment air at between about 150 to about 200 F. and having a relative humidity of between about 75 to 95% is introduced to the defiberizer to provide the requisite air moisture content. If desired overly large fibers from the forming head may be recycled to the defiberizer. By practicing the invention, electrostatic charges on the fibers are reduced thereby minimizing clumping and ensuring better formation.
    Type: Grant
    Filed: August 5, 1983
    Date of Patent: August 6, 1985
    Assignee: James River-Dixie/Northern, Inc.
    Inventor: Thomas Tao
  • Patent number: 4530700
    Abstract: Biomass is prepared for use as a fuel or chemical feed stock either by processing biomass to provide particles or by utilizing such particles that have been independently produced, in either case at a location remote from consuming sites. At a thus situated location, particles are delivered to at least one gas producing section and to a drying section with hot producer gas utilized in the drying section in a manner to so reduce the moisture content of the particles as to render the particles a more efficient fuel or chemical feed stock.
    Type: Grant
    Filed: February 15, 1984
    Date of Patent: July 23, 1985
    Inventors: Willard C. Sawyer, Edith M. Sawyer, Sherron M. Keef, John W. Sawyer
  • Patent number: 4516732
    Abstract: The invention is directed to a method and apparatus for comminuting stumps. The apparatus includes a generally cylindrical stationary drum having a feed opening in the upper portion through which stumps are fed to the drum. A rotatable substantially horizontal bottom encloses the lower end of the drum and is disposed to rotate about a vertical axis so that the stumps are forced to the outer periphery of the drum under centrifugal force and revolve along with the bottom. An abutment or counter member extending upwardly from the bottom and the stumps are braced against the countermember as they are moved into engagement with a generally cured vertically disposed blade that is spaced inwardly of the drum. The blade acts to comminute the stump and the chips or particles are discharged from the drum through a discharge opening which is disposed radially outward of the blade.
    Type: Grant
    Filed: January 24, 1983
    Date of Patent: May 14, 1985
    Assignee: Kajaani Oy
    Inventors: Heino Kela, Matti Laspa
  • Patent number: 4515318
    Abstract: The speed of feed movement of a piston is controlled to an essentially constant value by direct digital measurement of the actual speed, by comparing the actual value to a preset value and by compensating for differences therebetween. Variations in the piston feed pressure and in the grinding power are taken into account by means of additional signals related to these factors and added to or subtracted from the signal representing the actual value of the speed of the piston.
    Type: Grant
    Filed: December 13, 1983
    Date of Patent: May 7, 1985
    Assignee: Kymi-Stromberg Oy
    Inventor: Aslak Savonjousi
  • Patent number: 4506834
    Abstract: The invention relates to a method and a device for dispersing fibrous material. The fibrous material is accelerated and expanded together with a flowing medium in a nozzle (10). The nozzle (10) includes a converging and a diverging section and, thus, is a so-called de Lavel nozzle.
    Type: Grant
    Filed: November 7, 1983
    Date of Patent: March 26, 1985
    Assignee: Fiber Dynamics AB
    Inventor: Bo R. Ek
  • Patent number: 4504016
    Abstract: Process and apparatus are provided for cleaning chemical pulp by screening, in which the rejects from a first screening stage are rescreened in a second screening stage; the accepts from the second screening stage are separated in a hydrocyclone, and the clean fraction recycled to the first screening stage; the rejects from the second screening stage are beaten in a refiner and screened before or after the refiner; the suspension from the refiner is taken to the screen before the refiner, and the rejects from the screen after the refiner are recycled to the refiner.
    Type: Grant
    Filed: July 1, 1983
    Date of Patent: March 12, 1985
    Inventor: Nils A. L. Wikdahl
  • Patent number: 4474949
    Abstract: Absorbent retentive pulp, produced by mechanically treating a dispersion of cellulose fiber to the disintegrated and outer secondary walls to microfibrillar form. The beaten dispersion is then freeze dried.
    Type: Grant
    Filed: May 6, 1983
    Date of Patent: October 2, 1984
    Assignee: Personal Products Company
    Inventors: Pronoy K. Chatterjee, Kambiz B. Makoui
  • Patent number: 4474335
    Abstract: There is provided a centrifugal grinder which utilizes an internal grinding surface in the shape of a surface of revolution. A rotor is mounted coaxially within the grinding surface and has a central cavity defining at least one pocket through which material in the central cavity can contact the grinding surface. Material for grinding is delivered to the central cavity, and means are provided for rotating the rotor. Further means are incorporated in the rotor for applying water to the grinding surface.
    Type: Grant
    Filed: June 1, 1982
    Date of Patent: October 2, 1984
    Assignee: Koehring Canada
    Inventor: Allan J. Wildey
  • Patent number: 4458846
    Abstract: Wood is removed from debris in processes alternately conducted in a pair of side-by-side water filled tanks. Each tank includes an inclined bottom defining a deep end where sinking materials settle and a shallow end. Water jets along two adjacent sides of each tank creating a flow of surface water and floating wood toward one corner of the shallow end where the wood accumulates and is removed. Runways along two sides of each tank support debris handling equipment. A conveyor under one runway transfers the sinking materials away from the tanks. The wood is comminuted and sized for use as fuel.
    Type: Grant
    Filed: November 12, 1981
    Date of Patent: July 10, 1984
    Inventor: Henry C. Mardigian
  • Patent number: 4445906
    Abstract: A method and apparatus for the treatment of the combustible portion of crushed domestic waste. The waste is pre-dried and separated from dense-medium material such as metal and glass prior to processing. A dried waste moisture level of about 8-10% is maintained throughout the process. High heat value briquets are produced without the addition of a bonding agent by sifting out fine inert material and plastic material prior to briquetting.
    Type: Grant
    Filed: July 19, 1982
    Date of Patent: May 1, 1984
    Assignee: Mannesmann Veba Umwelttechnik GmbH
    Inventors: Hanns-Helmut Riemann, Hans Sonnenschein
  • Patent number: 4444830
    Abstract: A method of preparing fibrous hydrophilic fluff having increased absorbency is disclosed. An absorbent polymer solution is coated on base fluffing material, and the coated fluffing material is dried, disintegrated and mechanically worked into a fibrous fluff matrix which contains absorbent polymer platelets distributed throughout said matrix.
    Type: Grant
    Filed: January 4, 1982
    Date of Patent: April 24, 1984
    Assignee: The Dow Chemical Company
    Inventor: Robert E. Erickson
  • Patent number: 4443296
    Abstract: A process is provided for the removal from paper pulp of impurities, the pulp being contained in a pulping machine. Some of the pulp is periodically transferred into an enclosed chamber annexed to the pulping machine, the chamber having a volume which is small compared to the volume of the pulping machine. The pulp in the chamber is stirred and separated by a rotor, and fibre suspension is returned to the pulping machine, dilution water being introduced into this chamber. The chamber is emptied and impurities thereafter discharged.
    Type: Grant
    Filed: August 25, 1980
    Date of Patent: April 17, 1984
    Assignee: E et M Lamort (Societe Anonyme)
    Inventor: Jean P. Lamort
  • Patent number: 4435085
    Abstract: Pulp and oxygen are mixed by feeding the pulp and also feeding the oxygen to a mixer which has a grooved rotor closely spaced between two grooved discs to provide high intensity mixing zones.
    Type: Grant
    Filed: August 6, 1982
    Date of Patent: March 6, 1984
    Assignee: Ingersoll-Rand Company
    Inventors: Oscar Luthi, Lawrence A. Carlsmith
  • Patent number: 4433813
    Abstract: A method of forming wood fibres for use in the production of a riding surface comprises feeding wood chips having a length, in the grain direction, of from 18 mm to 35 mm, to a milling machine adjusted to break the wood chips into wood fibres, the lengths of the fibres produced by the milling machine being substantially in accordance with the following percentages, by volume, of the total volume:______________________________________ Wood fibre length Percentage of Total Fibre ______________________________________ 0 mm-5 mm 10%-20% 5 mm-15 mm 40%-55% 15 mm-35 mm 35%-50% ______________________________________It is found that a surface formed from a compacted layer, several inches deep, of fibres produced by the above method has excellent characteristics for horse riding and these characteristics are not unduly affected by variations in weather conditions.
    Type: Grant
    Filed: August 5, 1980
    Date of Patent: February 28, 1984
    Inventors: Rodney Whatton, Timothy W. Gilder
  • Patent number: 4428534
    Abstract: A method of improving the utilization of the heat energy produced in a wood grinding process when wood is ground in a grinding space (3) under a pressure exceeding atmospheric pressure, and warm shower water (G) is sprayed into the grinding space. Steam (H) is separated from the groundwood pulp (A) discharged from the grinding space in a steam separator wherein the groundwood pulp is allowed to expand from its inlet pressure to atmospheric pressure in at least two steam separators (11,14) by releasing steam from the groundwood pump in each steam separator by decreasing the pulp pressure. The amount of steam (H1,H2) released in the separate steam separators is adjusted according to the proportions in which steam is needed for utilizations purposes. Thus the heat energy of the pressure grinding process can be recovered in separate steam fractions the amount and pressure of which correspond to the requirements of the utilization purposes.
    Type: Grant
    Filed: November 2, 1981
    Date of Patent: January 31, 1984
    Assignee: Oy Tampella AB
    Inventors: Ari A. M. Maijala, Matti I. Aario
  • Patent number: 4415124
    Abstract: A method for the production of micropowders from cellulose ethers or cellulose comprising(a) subjecting a cellulose ether or a cellulose having a fine-fiber, cottony or woolly structure to a consolidation or embrittlement sufficient whereby in one mill pass through a jet mill under standard conditions 98% by weight of the consolidated or embrittled material charged is recovered as a powder of less than 100.mu., and(b) subjecting the consolidated or embrittled material to a grinding step producing a size reduction sufficient that a grain size distribution with at least 90% by weight of less than 125.mu. is attained.
    Type: Grant
    Filed: October 7, 1981
    Date of Patent: November 15, 1983
    Assignee: Henkel Kommanditgesellschaft Auf Aktien
    Inventors: Franz-Josef Carduck, Wilfried Rahse, Willi Wust, Hans Pabel
  • Patent number: 4406734
    Abstract: A method and a device for the manufacture of mechanical pulp from lignocellulosic material by forcing the said material into contact with a grindstone (1) which revolves about an axle (2). The material is supplied in bulk, particulate form, preferably as wood chips, a large number of particles simultaneously being retained, compressed and, in the presence of water, forced into contact with one or more grinding areas on the circumferential surface of the grindstone (1). The grindstone (1) is enclosed in a sealed, pressurized housing (5).
    Type: Grant
    Filed: October 9, 1980
    Date of Patent: September 27, 1983
    Assignee: Sunds Defibrator AB
    Inventor: Hjalmar S. I. Bystedt
  • Patent number: 4401277
    Abstract: The disclosure relates to apparatus for producing mechanical wood pulp of the type having a grinding stone with at least one wood supply chute in which the wood which is to be ground is pressed onto the grinding stone. A trough or a collecting channel is placed underneath the grinding stone. A water supply device moistens the grinding stone at the grinding zone. At least one closed water tank is set up on the grinding stone in front of the wood supply chute, viewed in the direction of rotation of the grinding stone. The water tank is sealed at least on the side furthest away from the supply chute. The tank has a supply line for pressurized water and has outlet holes directed toward the surface of the stone. Preferably, sealing of the water tank is effected by a sealing plug at the grinding stone which plug is adjustable with respect to the grinding stone to accommodate wear of the plug from the stone.
    Type: Grant
    Filed: April 14, 1981
    Date of Patent: August 30, 1983
    Assignee: J. M. Voith GmbH
    Inventors: Helmut Thumm, Theodor Bahr, Hans Henrich
  • Patent number: 4394977
    Abstract: A method for improving the utilization of the heat energy produced in a wood grinding process, wherein wood is ground in a grinding space (3) under a pressure exceeding atmospheric pressure, and warm shower water (G) is sprayed into the grinding space. The groundwood pulp (A) is fed from the grinding space into a steam separator (11), wherein the heat energy contained in the groundwood pulp is released in the form of steam (H), and replacement water (E) is brought into the process for the compensation of shower water losses. The steam separator is kept pressurized in order to recover the steam (H) released from the groundwood pulp under a greater pressure and at a higher temperature than in an atmospheric steam separator.
    Type: Grant
    Filed: November 4, 1981
    Date of Patent: July 26, 1983
    Assignee: Oy Tampella AB
    Inventor: Ari A. M. Maijala
  • Patent number: 4387856
    Abstract: At a fiberizer of a waste paper processing installation the rotational moment or torque is determined, for instance by measuring the drive output of a drive motor. In the presence of an increase of the rotational resistance of the rotor of the fiberizer there is brought about an intensification of the separation of rejects through a reject line and vice versa. For this purpose there are arranged in either the reject line or the good stock line, or at the same time in both such lines, throttle elements which are activated by a regulator. The regulator is controlled by a measuring signal of a measuring device which determines the electrical drive output of the rotor.
    Type: Grant
    Filed: September 2, 1980
    Date of Patent: June 14, 1983
    Assignee: Escher Wyss GmbH
    Inventor: Harald Selder
  • Patent number: 4381217
    Abstract: A method of increasing the temperature of shower water used in a wood grinding process wherein wood is ground in a grinding space (3) under a pressure exceeding atmospheric pressure, and warm shower water (G) is fed into the grinding space for improving the grinding process. In order to compensate losses of shower water replacement water (E) is added to the shower water circulating system. The replacement water is fed into the groundwood pulp (A) after the grinding space but before a steam separator. Thus cooler replacement water can be heated by the heat energy otherwise released from the groundwood pulp in the steam separator, and the temperature of the shower water can be maintained close to 100.degree. C. in spite of the addition of cool replacement water and without using a pressurized steam separator.
    Type: Grant
    Filed: November 2, 1981
    Date of Patent: April 26, 1983
    Assignee: Oy. Tampella AB
    Inventor: Erkki Turkia
  • Patent number: 4378092
    Abstract: Method and apparatus for grinding pulp stock in the grinding space of a defibrating apparatus, which space is defined between grinding surfaces carried by a pair of grinding discs, both of which rotate relative to one another within a closed housing, to thereby control the rate of flow of grist through the grinding space. The grinding space includes an inner grinding zone and two outer grinding zones which diverge at an angle to the radial plane of the inner zone. The inner grinding zone is defined between the two facially-opposed rotating discs in a plane substantially perpendicular to the axis of rotation, and the outer grinding zones are defined between portions of the two rotating discs which extend at an angle to the radial plane of the inner zone and correspondingly inclined facing surfaces of a stationary element such as a stator ring encasing the two rotating discs.
    Type: Grant
    Filed: October 27, 1980
    Date of Patent: March 29, 1983
    Assignee: Cell Develop, Inc.
    Inventor: Rolf B. Reinhall
  • Patent number: 4374702
    Abstract: Microfibrillated celluloses having properties distinguishable from all previously known celluloses, are produced by passing a liquid suspension of cellulose through a small diameter orifice in which the suspension is subjected to a pressure drop of at least 3000 psig and a high velocity shearing action followed by a high velocity decelerating impact, and repeating the passage of said suspension through the orifice until the cellulose suspension becomes a substantially stable suspension. The process converts the cellulose into microfibrillated cellulose without substantial chemical change of the cellulose starting material.
    Type: Grant
    Filed: October 22, 1981
    Date of Patent: February 22, 1983
    Assignee: International Telephone and Telegraph Corporation
    Inventors: Albin F. Turbak, Fred W. Snyder, Karen R. Sandberg
  • Patent number: 4372495
    Abstract: An apparatus for comminuting a substance which comprises a rotatable disc having a disintegrating surface and a base surface proximate to and facing the disintegrating surface. The apparatus has a means for rotating the disc and for feeding particles of the substance between the disintegrating surface and base surface. At least one of the disintegrating surface and base surface comprise an abrasive and at least one of the base surface and disintegrating surface comprise breaker bars. The invention also includes a novel disc for use in a disc refiner having an abrasive disintegrating surface and a novel comminuting plate for use as part of such a disc. The apparatus also desirably comprises a means for elevating the temperature of the substance being comminuted and desirably comprises a means for pressurizing the environment surrounding the substance being comminuted especially when the substance is wet wood chips and the desired product is fiberized wood pulp.
    Type: Grant
    Filed: April 28, 1980
    Date of Patent: February 8, 1983
    Assignee: The Research Foundation of State University of New York
    Inventors: Renata Marton, Alton F. Brown
  • Patent number: 4372810
    Abstract: A method and a device for the manufacture of mechanical pulp from lignocellulosic material by forcing the said material into contact with a grinding disc (1) which revolves about a central axle (2) perpendicular to the two end faces of the disc.. The material is supplied in bulk, particulate form, preferably as wood chips, a large number of particles simultaneously being retained, compressed and, in the presence of water, forced into contact with one or more grinding areas (5) on one or both end faces of the grinding disc. The disc is enclosed in a sealed, pressurized housing (6).
    Type: Grant
    Filed: October 9, 1980
    Date of Patent: February 8, 1983
    Assignee: Sunds Defibrator AB
    Inventor: Hjalmar S. I. Bystedt
  • Patent number: 4365761
    Abstract: A vortical circulation type pulper has a bladed and channelled rotor and an annular bladed and channeled stator mounted in a side, or bottom, wall, the rotor and annular stator forming a truncated conical attrition interface with the small end receiving stock for passage through the interface to the large end and thence for discharge or recirculation. Rotor/stator clearance at rest, is about 15/1000 of an inch. The stator is provided with an annular, pattern of alternate, triangular acquisition valleys and bladed and channeled peaks, each peak having an acquisition edge in the path of the stock reduction, edges of the rotor vanes so that the stock is reduced by the scissors-like contact of stock reduction edges of the vanes with the acquisition edges of the stator peaks in a stock reduction interface until sufficiently defibered to enter the truncated conical, bladed and channeled rotor/stator attrition interface for further treatment and recirculation or discharge.
    Type: Grant
    Filed: March 6, 1980
    Date of Patent: December 28, 1982
    Assignee: Bolton - Emerson, Inc.
    Inventor: Donald W. Danforth
  • Patent number: 4353509
    Abstract: A method for re-claiming fibers from peanut shells is disclosed wherein the shells are first flattened, the flattened shells are milled to produce a fraction containing fibers and a residue fraction and then the fiber fraction is separated from the residue. The fibers obtained are relatively long staple length fibers and can be used as an absorptive medium, in the form of continuous webs and the like.
    Type: Grant
    Filed: April 28, 1981
    Date of Patent: October 12, 1982
    Inventor: Clarence L. Bostian, Jr.
  • Patent number: 4332353
    Abstract: Procedure for mechanically raising the wood content of wood chips (1), or for mechanically purifying the wood chips of bark and greenstuff matter and of other fines such as sand, by separation sifting. Prior to the separation sifting (5) the bark and greenstuff matter are detached from the wood chips by grinding (3).
    Type: Grant
    Filed: December 20, 1979
    Date of Patent: June 1, 1982
    Assignee: Kone Osakeyhito
    Inventors: Heikki Lario, Matti Haimila
  • Patent number: 4326913
    Abstract: A method and apparatus in defibration of wood chips or similar vegetable material for conveying in steam pulp produced in a refiner (2) to a separator (7) for separating steam and pulp. The separator is bounded against the atmosphere and is kept pressurized by steam, while a limited amount of excess steam is led off. A flow of steam liberated from the pulp is taken from the separator and given an increased pressure for utilization in extracting pulp from the refiner. The steam flow is hereby led through the refiner and further to the separator, whereby the pulp is transferred to the separator by the steam which thus circulates to a considerable extent, said steam having been given the higher pressure either in the refiner itself, by means of pressure increasing means (19) therein, or upstream of the refiner in a separate pressure increasing means (11).
    Type: Grant
    Filed: January 2, 1980
    Date of Patent: April 27, 1982
    Assignee: Aktiebolaget Bahco Ventilation
    Inventor: Agne T. Mattsson
  • Patent number: 4324612
    Abstract: A process is provided for preparing groundwood pulp from debarked pulpwood logs, which comprises grinding the logs in the presence of water under a superatmospheric pressure of a gas selected from the group consisting of steam, air, and steam and air, and forming and discharging a pulp suspension in the resulting aqueous liquor, while continuously supplying water during the grinding in a volume of less than 35 parts per part of bone dry pulp at a rate of addition such that the temperature of the discharged pulp suspension is below 200.degree. C. and preferably below 180.degree. C. and within the range from about 1.5 to about 50, preferably from 2 to 8, times the temperature in .degree.C. of the added water at a pressure within the range from about 8 to about 40 kiloponds/cm.sup.2, preferably from 10 to 30 kiloponds/cm.sup.2, higher than the superatmospheric pressure and at a temperature within the range from about 2 to about 63.degree. C.
    Type: Grant
    Filed: November 26, 1979
    Date of Patent: April 13, 1982
    Assignee: Mo och Domsjo Aktiebolag
    Inventor: Jonas A. I. Lindahl
  • Patent number: 4305590
    Abstract: A sealing arrangement for a shutter for a feeding chamber of a continuously operating pressure grinder. The feeding chamber is provided with an inlet opening for feeding wood batches at atmospheric pressure into said feeding chamber and with an outlet opening for feeding said wood batches into the grinding chamber at overpressure. Each opening of said feeding chamber is provided with a shutter movable between an opened position and a closed position for preventing of escape of said overpressure through said feeding chamber.The feeding chamber is provided with a fixed guide supporting the shutter during its movement between opened and closed positions. Said guide comprises two parallel support surfaces between which the shutter is slidably mounted. The distance between said support surfaces is greater than the thickness of the shutter adjacent said support surfaces so that the shutter is displaceable towards and away from said support surfaces in a direction perpendicular to said support surfaces.
    Type: Grant
    Filed: June 3, 1980
    Date of Patent: December 15, 1981
    Assignee: Oy Tampella AB
    Inventors: Pekka Haikkala, Eero Hanhilahti, Raimo Pessa, Matti Aario
  • Patent number: 4304361
    Abstract: A process for reducing sugarcane bagasse to a peat moss-like material that is useful as a planting or potting soil consists of the steps of: (1) screening the bagasse to remove the short fibers which are about 1/4 to 3/8 inch (6.35-9.53 mm) in length; (2) feeding the so-screened bagasse through a hammermill to reduce the remaining long fibers to fibers of a shorter length; and, (3) removing the short fibers which are about 1/4 to 3/8 inch (6.35-9.53 mm) in length as they are generated in the hammermill. The product consisting essentially of short fibers of bagasse which are about 1/4 to 3/8 inch (6.35-9.53 mm) in length produced by the foregoing process.
    Type: Grant
    Filed: November 19, 1979
    Date of Patent: December 8, 1981
    Inventor: George E. Campbell
  • Patent number: 4298425
    Abstract: Method and apparatus for producing fiber pulp of improved paper-forming characteristics from ligno-cellulose-containing material such as wood chips and the like. The pulp material is subjected to a defibrating process in at least two steps. In the first step, the pulp material is disintegrated in a defibrator to form a flocculent mass of initially separated and freed fibers. This flocculent mass is then passed through a screw compacting device in which it is subjected to compression of a magnitude of 1 to 5 times the volume of the initially separated fibers. The compressed and highly concentrated mass of initially separated fibers is then passed into a refiner wherein the fibers are finally separated and fibrillated to form the final pulp.The refining is performed at a dry content of about 25-30%.
    Type: Grant
    Filed: April 25, 1979
    Date of Patent: November 3, 1981
    Assignee: Defibrator Aktiebolag
    Inventors: Carl-Olov B. Ranzen, Knut O. Danielsson
  • Patent number: RE31862
    Abstract: The invention relates to the production of a wholly mechanical pulp of improved strength properties. The lignocellulosic material is fed into a substantially closed chamber where it is mechanically abraded under a power input of fifteen or more horsepower days per ton. During the abrading step, the material is maintained in an inert gaseous atmosphere of a pressure of ten to eighty psig, preferably twenty to forty psig.
    Type: Grant
    Filed: March 22, 1983
    Date of Patent: April 9, 1985
    Assignee: Sunds Defibrator, Inc.
    Inventors: Kenneth C. Logan, Friedrich O. B. Ludhe