Patents Assigned to Valmet Oy
  • Patent number: 5069394
    Abstract: The invention concerns a drive unit (10) for the center-wind reel-up of a paper machine or paper finishing machine, comprising means by which the rotation drive of the motor (11) is transferred to the shaft (19). In its interior, the shaft (19) comprises a transfer shaft (21) rotatable along with the shaft (19), said transfer shaft (21) being fitted to be displaceable on a coupling and uncoupling process in the direction of the longitudinal axis (X.sub.1) of the shaft (19) by means of a cylinder device (22). When the transfer shaft (21) is displaced (arrow L.sub.1) towards the coupling half (23b) of the central drum of the paper web roll (P), the coupling half (23a) of the drive unit attached to the end of the transfer shaft (21) is displaced into engagement with the web roll coupling half (23b). The invention further concerns a hydraulic operating system for the reel-up.
    Type: Grant
    Filed: February 13, 1990
    Date of Patent: December 3, 1991
    Assignee: Valmet Oy
    Inventors: Vaino Panttila, Voitto Villgren
  • Patent number: 5015495
    Abstract: A method used in wet painting or in powder coating an object for accelerating the drying of the painted surface or the polymerization of the powder coating applied to the object. The object to be painted or coated is electrically coupled into an electric circuit so that it constitutes an electrical resistance in the circuit. When an electric current is passed through the circuit, the object is heated by virtue of the electrical resistance presented thereby to an elevated temperature suitable for the drying of the paint or for the polymerization of the powder coating. In wet painting, the temperature of the object is raised to about 60.degree. to 80.degree. C. and maintained at that temperature for about 0.5 to 2 hours. In powder coating, the temperature of the object is raised to about 180.degree. to 200.degree. C. with this temperature being maintained for about 15 minutes.
    Type: Grant
    Filed: June 11, 1984
    Date of Patent: May 14, 1991
    Assignee: Valmet Oy
    Inventor: Olli Nissinen
  • Patent number: 5009016
    Abstract: A method for contact-free drying of a paper or board web or of any other corresponding continuous web. During drying, both infrared radiation and drying air jets are used. The web is carried by the air jets through the dryer free of contact. The moving web is first passed into an infrared drying gap, in which a drying energy pulse of relatively short duration is directed at the web, the power of the energy pulse being substantially higher than the average drying power of the dryer per unit of area. After the infrared drying gap, the web is immediately passed into an airborne web drying gap wherein the web is supported and dried by means of air jets. Air is brought into the infrared unit, which air having been heated in the infrared unit is passed as replacement air and/or drying air for the airborne web drying unit or units placed after the infrared unit.
    Type: Grant
    Filed: July 14, 1989
    Date of Patent: April 23, 1991
    Assignee: Valmet Oy
    Inventors: Matti LePisto, Reijo Ilmanen, Markku Karlsson, Sauli Laakso
  • Patent number: 4976821
    Abstract: A press section in a paper machine includes, in the direction of web run, two successive, separate press nips for dewatering a web, the web passing between the nips in a closed draw. The first nip is formed between two, preferably hollow-faced, press rolls. The press section includes a first fabric which picks up the web from the forming wire. The press section comprises at least three fabrics of which one acts as a press fabric in the first press nip and another acts as a press fabric and/or as a transfer fabric both in the first as well as in the second nip. The web is transferred from the last press nip of the press section to the drying section. The last press nip is formed by an extended-nip press and has a nip zone with a length substantially longer than the length of the press zone of the preceding roll nip.
    Type: Grant
    Filed: October 26, 1989
    Date of Patent: December 11, 1990
    Assignee: Valmet Oy
    Inventor: Jorma Laapotti
  • Patent number: 4931143
    Abstract: A press section of a paper machine includes, in the direction of web run, at least three successive, separate press nips for dewatering a web, the web passing between the nips in a closed draw. The web is dewatered in the first nip through both of its faces. The press section includes at least one upper fabric and lower fabrics, the first fabrics in the direction of web run being water-receiving fabrics arranged such that one of the first fabrics acts as a press fabric in the first nip while the other of the first fabrics acts as a press fabric both in the first as well as in the second nip. Of the second fabrics in the direction of web run, the upper fabric is a water-receiving press fabric while the second lower fabric is a substantially non-water receiving transfer fabric or belt on which the web is transferred from the third press nip to the following drying section as a closed draw.
    Type: Grant
    Filed: May 20, 1985
    Date of Patent: June 5, 1990
    Assignee: Valmet Oy
    Inventors: Mikko Karvinen, Jorma Laapotti
  • Patent number: 4892622
    Abstract: A method of and arrangement for resisting formation of undulations in a fiber/water mixture supplied onto a forming wire at an open planar wire section of a paper-making machine include establishing over the wire an air curtain extending over the full breadth thereof, in the region of which the air mass upon the wire is set in motion. The direction of movement of the air mass is the same as the traveling direction of the wire, and the velocity of the air substantially equals the speed of the wire. The air curtain commences on the planar wire section, in the machine direction, only at a given distance from a lip slice of a headbox of the machine, and the air curtain extends along the traveling direction of the web over the planar wire section over a given distance.
    Type: Grant
    Filed: August 20, 1987
    Date of Patent: January 9, 1990
    Assignees: Valmet Oy, Kymmene Oy
    Inventors: Raimo Malkki, Paavo Jaatinen, Timo Haverinen, Pekka Eskelinen, Juhani Jokinen, Vesa Vuorinen, Raimo Virta, Martti Salmivaara
  • Patent number: 4863656
    Abstract: A method for manufacturing a microporous plate, a filter plate obtained from the method, and suction drier apparatus utilizing such filter plates. According to the method, a casting mix is introduced into the interior of a gypsum mold whereupon water is absorbed from the casting mix into the gypsum so that a crust remains on the inner surface of the mold. The crust is allowed to develop to an appropriate thickness whereupon the remaining casting mix is drained from the mold. The inner surfaces of the crust are allowed to dry whereupon the interior space defined between opposed crust wall portions is filled with a granular material which preferably has the same composition as the crust material. A filter plate comprises a pair of opposed suction walls defining an interior space between them which is filled with a granular material. The suction drier apparatus includes at least one of the filter plates which is mounted to be moved into and out of a basin or the like in which material to be dewatered is present.
    Type: Grant
    Filed: June 10, 1988
    Date of Patent: September 5, 1989
    Assignee: Valmet Oy
    Inventor: Rolf Hindstrom
  • Patent number: 4856159
    Abstract: Spreader roll for a fabric in a paper machine, the spreader roll being supported at the middle of thereof and comprising an inner tube and an outer tube attached onto the inner tube through an intermediate part. The inner tube and the outer tube are substantially coaxial with one another when the roll is in an unbent state. Annular intermediate spaces are situated between the tubular parts at both sides of the intermediate part, the intermediate spaces being dimensioned so they permit deflection of the inner tube and the outer tube relative to one another when the fabric passing over the roll is being tensioned. Ends or end flanges are situated at the outer end of the inner tube, along with axle journals. The double mantle of the roll with the intermediate part thereof is composed of a piece of reinforced plastic made as a substantially single, unified piece, in which the outer tube and the inner tube are integrally connected through the intermediate portion, without joints.
    Type: Grant
    Filed: February 12, 1987
    Date of Patent: August 15, 1989
    Assignee: Valmet Oy
    Inventor: Osmo Skytta
  • Patent number: 4856161
    Abstract: A press roll for a paper machine includes a cylindrical mantle formed of metal providing the roll with mechanical strength. A coating is provided on the roll mantle, the coating being partially or entirely metallic. The metallic coating is preferably formed of stainless steel containing chromium and provides for a controlled detachment of the paper web from the roll coating as well as durability, i.e., ability to withstand various strains to which the roll surface is subjected. In addition to the metallic component, the roll coating may also include a component or components of ceramic material.
    Type: Grant
    Filed: April 1, 1988
    Date of Patent: August 15, 1989
    Assignee: Valmet Oy
    Inventor: Veijo Miihkinen
  • Patent number: 4856204
    Abstract: A method for manufacturing a microporous plate, a filter plate obtained from the method, and suction drier apparatus utilizing such filter plates are disclosed. According to the method, a casting mix is introduced into the interior of a gypsum mold whereupon water is absorbed from the casting mix into the gypsum so that a crust remains on the inner surface of the mold. The crust is allowed to develop to an appropriate thickness whereupon the remaining casting mix is drained from the mold. The inner surfaces of the crust are allowed to dry whereupon the interior space defined between opposed crust wall portions is filled with a granular material which preferably has the same composition as the crust material. A filter plate comprises a pair of opposed suction walls defining an interior space between them which is filled with a granular material.
    Type: Grant
    Filed: December 3, 1986
    Date of Patent: August 15, 1989
    Assignee: Valmet Oy
    Inventor: Rolf Hindstrom
  • Patent number: 4856154
    Abstract: Method in a variable-crown roll in which hydraulic loading elements or a series of hydraulic loading elements are used. Such series of elements acts along a plane of a nip that can be formed between the variable-crown roll and a counter-roll thereof, with such elements or series being situated between a central axle of the roll and a cylindrical mantle which is rotatable about the central axle through radial bearings. The central axle is supported by axle journals thereof on deflection bearings. In the method, the central axle is pivoted about the deflection bearings thereof over an angle which is within a range of about 30.degree. to 180.degree.. By the effect of such pivoting, the variable-crown roll and the mantle thereof are shifted away from the nip, so that the nip is opened. This shifting is produced by the axis of pivoting of the deflection bearings being situated by a certain eccentricity distance further away from a nip line of the closed nip, than the axis of rotation of the roll mantle.
    Type: Grant
    Filed: November 23, 1987
    Date of Patent: August 15, 1989
    Assignee: Valmet Oy
    Inventors: Osmo Nikulainen, Vesa Kainu
  • Patent number: 4856155
    Abstract: Method in an adjustable-crown roll, in which a series of hydraulic loading elements is used. A central axle of the roll is supported by axle journals, by means of deflection bearings. A cross-section of the central axle is shaped such that the axle has sufficiently high rigidity in a nip plane. In the method, the central axle is rotated about its deflection bearings over an angle, which may be within the range of about 30.degree. to 180.degree.. A free space that is created or enlarged between the central axle and a roll mantle thereby, and provided between the central axle and an inner surface of the roll mantle, is utilized as an opening gap for the nip formed by the variable-crown roll, by allowing the roll mantle to be shifted, e.g. by the effect of gravity, or by affirmatively shifting the mantle relative to the rotated central axle.
    Type: Grant
    Filed: November 23, 1987
    Date of Patent: August 15, 1989
    Assignee: Valmet Oy
    Inventors: Juhani Niskanen, Martti Pullinen
  • Patent number: 4856158
    Abstract: A spreader roll supported at the middle thereof for a wire or felt in a paper machine, comprising a metallic inner tube and an outer tube attached onto the inner tube through an intermediate part, the intermediate part being substantially symmetric relative to a transverse center plane of the roll. The inner tube and the outer tube are substantially coaxial with one another when the roll is in an unbent state, with annular intermediate spaces situated between the tubes at both sides of the intermediate part, such intermediate spaces being dimensioned to permit deflection of the inner tube and the outer tube in different directions relative to one another by the effect of tensioning force of the fabric arranged to run over the roll. Ends or flanges can be attached to outer ends of the inner tube, while axle journals can be attached to these ends or flanges, by means of which the roll can be journaled to revolve.
    Type: Grant
    Filed: February 12, 1987
    Date of Patent: August 15, 1989
    Assignee: Valmet Oy
    Inventors: Kaj Lindroos, Mauno Tohonen
  • Patent number: 4854052
    Abstract: A floater dryer for drying a web-shaped (W), moving material, in particular a paper or cardboard web. The dryer comprises a plurality of radiation/air blowing units (10) which are provided on one side of the web (W) or on both sides (10A,10B). The units (10) have been shaped to be blow boxes having on their side facing the web (W) a contact-free carrier surface (21R,27) and into conjunction with which is blown, through a nozzle aperture (20a,20b) opening on the leading and/or trailing edge of the carrier surface, an air jet (Ful), or air jets (Fua,Fub). The jets will have a substantially large component parallel to said carrier surface. In conjunction with the radiation/air blowing units (10) are provided radiation elements (30) from which into the treatment interval (P.sub.1, P.sub.2, P-) is directed radiation (S.sub.O) through a window (27). The window at the same time serves as carrier surface for the air support of the web (W). The air flows (F.sub.3,F.sub.
    Type: Grant
    Filed: October 16, 1987
    Date of Patent: August 8, 1989
    Assignee: Valmet Oy
    Inventor: Matti Korpela
  • Patent number: 4832794
    Abstract: Method and apparatus for compensating bending of a lip beam in a paper machine when papermaking pulp flowing through the slice formed with the lip beam causes loading upon a bottom surface of the top lip beam. The bending of the beam caused by the loading is compensated by bending the lip beam in the opposite direction, by creating a temperature difference in the lip beam between a top part and a bottom part of the same.
    Type: Grant
    Filed: August 26, 1987
    Date of Patent: May 23, 1989
    Assignee: Valmet Oy
    Inventor: Markku Lyytinen
  • Patent number: 4825520
    Abstract: Method for stabilizing a glide shoe loaded against an inner face of a revolving mantle of a roll adjustable in zones. The glide shoe is supported by an articulated joint on a piston which loads the glide shoe with adjustable pressure. In order to ensure lubrication of the glide face between the glide shoe and the inner face of the roll mantle, within an area of a front edge of the glide face as seen in a direction of rotation of the roll mantle, a shifting and/or steepening of compression pressure applied by the glide shoe through lubricant onto the inner face of the roll mantle is produced by means of a wedge space within the front edge of the glide face, said shifting and/or steepening in turn generating a moment having a direction opposite to a direction of a moment produced by frictional force of the glide face of the shoe. The thickness of the lubricant film is increased by this moment in the area of the front side of the glide face.
    Type: Grant
    Filed: February 11, 1987
    Date of Patent: May 2, 1989
    Assignee: Valmet Oy
    Inventors: Juhani Alajoutsijarvi, Juha Ehrola, Antti Ilmarinen, Matti Verkasalo
  • Patent number: 4807522
    Abstract: In combination with a piston-and-cylinder arrangement, supporting and attaching apparatus for attaching the piston-and-cylinder arrangement to a supporting structure and for supporting the piston-and-cylinder arrangement includes a frame attached to the cylinder for transmitting loads acting on the piston-and-cylinder arrangement to the supporting structure, the frame having a shell-type design disposed over at least a portion of the cylinder and a mechanical joint for attaching the frame to the cylinder. The supporting and attaching apparatus include a reinforcing rib which closes an end of the frame adjacent to the closed end of the cylinder, the reinforcing rib being coupled to the closed cylinder end. The frame is clamped on the piston-and-cylinder arrangement against a sleeve-like collar that projects from the cylinder by a bolt joint which attaches the reinforcing rib to the closed end of the cylinder.
    Type: Grant
    Filed: October 8, 1986
    Date of Patent: February 28, 1989
    Assignee: Valmet Oy
    Inventors: Olli Saarela, Vesa Helske, Erkki Haapanen
  • Patent number: 4805719
    Abstract: A vehicle is described having a front pair of ground contacting wheels, a rear pair of ground contacting wheels, an internal combustion engine, hydraulic motors for driving each said ground contacting wheel, and a plurality of variable flow hydraulic pumps for driving the hydraulic motors. In such a vehicle the internal combustion engine (7) is arranged to drive directly first and second variable displacement pumps (12, 13) for driving the motors (46, 47) of the front pair of wheels (2) and the motors (47, 48) of the back pair of wheels (3) respectively as well as first and second boost pumps (14, 15), while a control valve (22) is supplied with hydraulic fluid from one of the boost pumps (14) and is arranged to give an output hydraulic pressure which is dependent on the speed of the engine (7).
    Type: Grant
    Filed: September 18, 1987
    Date of Patent: February 21, 1989
    Assignee: Valmet Oy
    Inventor: Pentti Kostamo
  • Patent number: RE33138
    Abstract: A roll manufacturing method and roll, particularly for paper machines, wherein an inner roll body is surrounded by a strip having circumferential portions such as windings which engage and extend outwardly from an exterior surface of the inner roll body with the successive windings or circumferential strip portions engaging each other so that the engaging side surfaces of successive strip turns define an interface between themselves. The side surfaces of the strip are formed with registering grooves which thus define a bore extending across the interface, and an elongated interlocking member is situated in the latter bore so as to interlock the successive turns or circumferential strip portions against radial displacement outwardly away from the inner roll body. The interlocking member preferably has a fluid-tight sealing engagement with the groove surfaces which define the bore which receives the interlocking member, so that the interlocking member also forms a moisture barrier.
    Type: Grant
    Filed: July 25, 1984
    Date of Patent: January 2, 1990
    Assignee: Valmet Oy
    Inventor: Vaino Sailas
  • Patent number: RE33792
    Abstract: A connecting device for measuring instruments includes a body member attached to a member which forms a boundary surface of a process. The body member has an aperture therein for communication with the process. The process is measured through the aperture by a measuring instrument affixed to the connecting device. The measuring instrument is affixed to a selector member mounted movably with respect to the body member. The selector member has a hole communicating with the aperture of the body in the measuring position of the connecting device. The selector member has a closing surface closing the aperture of the body in the closed position of the connecting device.
    Type: Grant
    Filed: June 12, 1987
    Date of Patent: January 14, 1992
    Assignee: Valmet Oy
    Inventor: Veikko Makinen