Patents Assigned to Valmet Corporation
  • Shoe press
    Patent number: 6083352
    Abstract: A shoe press for applying pressure to a moving web of paper or the like includes a press shoe extending along a full width of the web being carried through a nip defined between the shoe and a backing member, a support for the shoe, and a plurality of articulated hydraulic loading cylinders arranged between the support and the shoe for urging the shoe toward the backing member to apply pressure to the web. Each loading cylinder includes a single piston and first and second cylinders attached to the shoe and to the support, respectively. The opposite end portions of the piston are slidably received within the cylinders so as to define working chambers in the cylinders which are pressurizable by hydraulic fluid for urging the two cylinders away from each other.
    Type: Grant
    Filed: October 30, 1998
    Date of Patent: July 4, 2000
    Assignee: Valmet Corporation
    Inventors: Jorma Snellman, Erik Brox, Lars Gustavsson, Juha Mikko Tapani Kivimaa
  • Method for controlling a multi-phase screening apparatus
    Patent number: 6080274
    Abstract: A method and apparatus for controlling a multi-step screening apparatus (1) controls other accept, reject and dilution flows in relation to the flow measured in the accept channel (7a) of the first screening step (3a). Thus a simpler control unit (9) can be used and accept of higher quality can be obtained than before. The apparatus has a control unit (9) aranged to measure the flows of all accept, reject and dilution water channels (7a-7c, 5a, 5b, 11a, 11b) and to adjust the flow of the other channels on the basis of the flow of the accept channel of the first step.
    Type: Grant
    Filed: April 1, 1998
    Date of Patent: June 27, 2000
    Assignee: Valmet Corporation
    Inventors: Jouko Hautala, Juhani Valli, Timo Vuorinen, Jorma Petajisto
  • Web finishing section in a paper machine
    Patent number: 6076281
    Abstract: A web finishing section in a paper machine including a dryer section having one or more dryer groups, a calender and a reel-up. The calender is placed at least partly underneath the reel spool storage space of the reel-up so that the reel-up is placed substantially directly after the calender, in which case, the web is passed directly from a calendering nip in the calender onto the reel cylinder or to a substantially short distance from the calender, the web being passed over one guide member that supports and/or spreads the web onto the reel cylinder. The calender includes one or more calendering belts for carrying the web through the calendering nip(s). A method for finishing a web is also described.
    Type: Grant
    Filed: June 7, 1999
    Date of Patent: June 20, 2000
    Assignee: Valmet Corporation
    Inventors: Jukka Kilpia, Jyrki Rantanen, Sirkka Lehtonen
  • Cylinder group provided with single-wire draw in the dryer section of a paper machine and dryer section that included such cylinder groups
    Patent number: 6070340
    Abstract: A dryer group with single-wire draw in the dryer section of a paper machine including heated drying cylinders having a smooth face against which a paper web to be dried is brought into direct contact, reversing cylinders and a drying-wire guided by guide rolls, the drying cylinders and the reversing cylinders in a loop whereby the drying cylinders are situated outside the wire loop and the reversing cylinders are situated in gaps between the drying cylinders and inside the wire loop of the drying wire. The drying cylinders consist of large cylinders and small cylinders, the diameter D of the large cylinders being larger than the diameter d of the small cylinders. The small cylinders are situated in gaps between adjacent pairs of large cylinders so that their centers of rotation are on a level substantially different from the level of the centers of rotation of the large cylinders.
    Type: Grant
    Filed: April 17, 1998
    Date of Patent: June 6, 2000
    Assignee: Valmet Corporation
    Inventor: Juha Lipponen
  • Method and arrangement in a web former for preventing rewetting of a web
    Patent number: 6071381
    Abstract: The invention relates to a method for preventing rewetting of a web in a former. Water is removed from the web (W) by means of dewatering members. The web (W) is formed by forming members and forming rolls on support of a wire loop/loops. The wire loop/loops (10) is/are guided by alignment, guide and/or suction rolls (11, 12). The web (W) supported by a wire (10) is passed by at least two vacuum boxes/chambers (16, 17) after the last suction roll (11). At least two vacuum boxes/chambers (16, 17) are fitted after the last suction roll (11). The web (W) and the wire (10) are arranged to be dewatered by means of a first vacuum box/chamber (16). The transport of moisture from the wire (10) back into the web (W) is prevented by means of a second vacuum box/chamber (17), and a vacuum (P.sub.1) in the first vacuum box/chamber (16) is higher than a vacuum (P.sub.2) in the second vacuum box/chamber (17).
    Type: Grant
    Filed: May 4, 1998
    Date of Patent: June 6, 2000
    Assignee: Valmet Corporation
    Inventor: Antti Leinonen
  • Heat exchanger
    Patent number: 6070655
    Abstract: A heat exchanger, for use in particular in connection with the process outlets at paper, pulp and board mills, including substantially parallel tubes or equivalent arranged in a duct. An air flow that delivers heat passes through the tubes and an air flow that receives heat passes through gaps between the tubes in accordance with the cross-flow principle. The heat faces of the tubes are made larger at the side of the flow that receives heat by means of ribs, lamellae or equivalent, and an air that is moist, saturated, or near its saturation curve is used as the air flow that delivers heat in the heat exchanger.
    Type: Grant
    Filed: June 6, 1997
    Date of Patent: June 6, 2000
    Assignee: Valmet Corporation
    Inventor: Pertti Heikkila
  • Carriage for transporting and storing doctor blades
    Patent number: 6068272
    Abstract: A carriage for transporting and storing doctor blades including a frame and wheels at a bottom of the frame. The carriage is movable on support of the wheels into different positions throughout the paper machine. Storage boxes for doctor blades are arranged in an interior spare of the carriage. In use, the doctor blades are discharged from the storage boxes. The carriage also includes a cover which can be opened and closed to access the interior space.
    Type: Grant
    Filed: June 18, 1998
    Date of Patent: May 30, 2000
    Assignee: Valmet Corporation
    Inventor: Iikka Eskelinen
  • Dryer sections with intermediate calendering in a paper machine
    Patent number: 6065222
    Abstract: A dryer section of a paper machine which is provided with at least one intermediate calendering nip and includes several successively arranged wire groups. The dryer section primarily or exclusively has groups with single-wire draw in which heated drying cylinders are arranged in an upper row and reversing suction cylinders or reversing suction rolls are arranged in a lower row below the upper row. The groups with single-wire draw also have a drying wire which runs along a meandering path over the drying cylinders and reversing suction cylinders or rolls so that the reversing suction cylinders remain inside the loop of the drying wire. A calender roll is arranged in opposed relationship to a drying cylinder in one or more of the single-wire draw groups in a sector which the first face of the web is exposed to thereby define a calendering nip therewith.
    Type: Grant
    Filed: October 20, 1998
    Date of Patent: May 23, 2000
    Assignee: Valmet Corporation
    Inventors: Antti Kuhasalo, Juha Kaihovirta, Allan Liedes
  • Method for controlling curl of paper in a dryer section of a paper machine
    Patent number: 6061927
    Abstract: A method in a dryer section of a paper or board machine for controlling curl of paper, in which steam treatment and/or moistening of the paper web is/are employed. The operations carried out in order to control the curl of the paper web are carried out in a number of stages when the web temperature is, during at least one stage, lower than 85.degree. C., preferably lower than 75.degree. C., and when the dry solids content of the web is in the range of K1-K2, wherein K1 is the ultimate dry solids content of the web -7% and K2 is the ultimate dry solids content +3%.
    Type: Grant
    Filed: April 6, 1999
    Date of Patent: May 16, 2000
    Assignee: Valmet Corporation
    Inventors: Vesa Ijas, Kari Juppi, Pasi Ahonen, Jaakko Kallioniemi
  • Method and apparatus for coating a moving paper or cardboard web
    Patent number: 6063449
    Abstract: A method and apparatus for coating a moving web of paper or paperboard. The web to be coated is passed to a coater station, wherein a coat layer is applied to at least one surface of the web by means of high-pressure spraying nozzles, whereby the pattern width covered by a single nozzle is essentially narrower than the cross-machine width of the web being coated. The nozzles are located in an enclosure and the excess coat mist formed in the process is removed by means of suction tubes, and advantageously, with the help of a falling film of coating mix flowing down the internal wall(s) of the enclosure.
    Type: Grant
    Filed: June 2, 1998
    Date of Patent: May 16, 2000
    Assignee: Valmet Corporation
    Inventors: Jukka Koskinen, Erkki Kirveskari, Vilho Nissinen, Jorma Kinnunen, Seppo Luomi
  • Roll for a supercalender and method for calendering a web
    Patent number: 6039840
    Abstract: A paper machine roll, in particular a roll for a supercalender, which includes a frame and a polymer coating on the frame. The deformability of the polymer coating on the roll increases within a certain axial distance from the middle area of the roll toward the ends of the roll in order to compensate for the deformation state of the end areas of the roll frame, which deformation state is uneven when the roll is loaded.
    Type: Grant
    Filed: December 16, 1998
    Date of Patent: March 21, 2000
    Assignee: Valmet Corporation
    Inventors: Pauli Kytonen, Juha Koriseva, Erkki Leinonen
  • Method for controlling the curl of paper and a paper or board machine line that applies the method
    Patent number: 6038789
    Abstract: A method for controlling the curl of paper in which steam treatment and/or moistening of the paper web is/are carried out after the calendering process being performed in the calender. In processes in which calendering is not employed, the curl is controlled in connection with a machine reel-up or in process steps carried out after the machine reel-up. A paper or board machine applying the method includes a headbox, a former, a press, a dryer section and steam boxes, moistening devices, an IR dryer and/or equivalent curl control devices. The steam boxes, moistening devices, IR dryers and/or equivalent curl control devices for the control of the curl are arranged after the calender or, if no calender is employed, in connection with a machine reel-up or a finishing process carried out after the machine reel-up.
    Type: Grant
    Filed: May 15, 1998
    Date of Patent: March 21, 2000
    Assignee: Valmet Corporation
    Inventors: Juha Kaihovirta, Pekka Pakarinen, Matti Luontama
  • Apparatus for transferring paper rolls along an incline
    Patent number: 6032584
    Abstract: A carriage and track assembly for transferring paper and paperboard rolls along an inclined track. The assembly is useful for the transfer of paper rolls of slippery grades and is based on using a dual track (5, 6) over the length of the inclined section of the transfer track and having compatible wheel sets (3, 4) on the transfer carriage. The front end of the carriage is provided with a wheel assembly (3, 4) in which the rolling perimeter varies at different trackwidths of the assembly. The wheel assembly can be made to run along the inclined sections of said tracks (5, 6) so that in said wheel assembly the rolling perimeters of its wheel sets (3, 4) running on different tracks are vertically located at different heights from the loading platform (1) of the carriage. Thus, the loading platform remains substantially horizontal while the carriage travels along the inclined track.
    Type: Grant
    Filed: February 6, 1997
    Date of Patent: March 7, 2000
    Assignee: Valmet Corporation
    Inventors: Jukka Joutsjoki, Raimo Ruohio, Esko Nieminen
  • Method and apparatus in a paper or board machine for dewatering the web
    Patent number: 6030499
    Abstract: The invention relates to an apparatus in a paper or board machine for dewatering the web prior to its passage to a press section. The dewatering is effected by a pair of rolls, which is located at the end of a wire section upstream of a pick-up suction roll or a similar transfer device. An additional wire is brought in contact with a side of the web opposite that of the wire of the wire section and it is passed together with the wire of the wire section and the web through the pair of rolls. One of the rolls is an open-surfaced roll for receiving water from the web over its area of contact with the path of travel formed by the wires and the web. The other roll of the pair of rolls is a smooth-surfaced roll and is in contact within the area of contact with the path of travel formed by the wires and the web on the opposite side.
    Type: Grant
    Filed: March 20, 1998
    Date of Patent: February 29, 2000
    Assignee: Valmet Corporation
    Inventor: Nils Soderholm
  • Coupling for the tending-side end of a roll in a paper machine or paper finishing machine
    Patent number: 6030327
    Abstract: A coupling arrangement for the tending-side end of a roll in a paper machine, such as a suction roll or a variable-crown roll, or a roll in a paper finishing machine, such as a variablecrown roll or a heated roll in a calender for paper. Through this coupling arrangement, energy media are passed into the roll, such as pressure fluid and/or compressed air, lubricating media, such as lubrication oil and/or water, and cleaning media, such as hot water. The coupling arrangement includes an openable shield casing which is tightly connected with the tending-side end of the roll and a coupling flange or coupling flanges to which the various pipes and/or hoses are attached. In the interior of the shield casing, there are connecting pipes and/or hoses which connect the pipe parts of the roll end with the hose and/or pipe parts departing from the coupling arrangement.
    Type: Grant
    Filed: March 11, 1998
    Date of Patent: February 29, 2000
    Assignee: Valmet Corporation
    Inventors: Jyri Suomalainen, Miikka Kettunen, Hannu Hyvonen
  • Coater nozzle having means for preventing the plugging thereof, and method of preventing plugging of a coater nozzle
    Patent number: 6027768
    Abstract: An apparatus and method for preventing plugging of a narrow, slot-orifice-type jet nozzle 6 used in a paper and board coater in which the jet nozzle extends over the entire cross-machine width of the web being coated. The coater has an application chamber 11, a coating mix infeed channel 5 connected thereto and a clot orifice 6 as well as at least one inlet port 13 for feeding the coating mix into the application chamber 11. An easily cleanable strainer element 12 is placed close to the applicator apparatus to separate aggregates of the coating mix that otherwise could plug the slot orifice 6.
    Type: Grant
    Filed: February 27, 1997
    Date of Patent: February 22, 2000
    Assignee: Valmet Corporation
    Inventors: Jukka Koskinen, Vilho Nissinen
  • Bearing control system for a roll with hydrostatic bearings
    Patent number: 6012386
    Abstract: A bearing control system for a roll with hydrostatic bearings which is mounted by its axle on a bearing block or other equivalent frame member by hydraulically loaded hydrostatic bearing elements. A principal bearing element acts in a principal loading direction and another bearing element is a backup bearing element which acts in a direction opposite to the principal loading direction. The bearing elements include bearing shoes positioned freely around the axle in order to support the axle so that the roll revolves freely in relation to the bearing block or other frame member. The control system feeds a hydraulic pressure medium to the hydrostatic bearing elements so that the roll is displaceable in the principal loading direction, e.g., in the direction of the nip plane, by displacing the axle via the bearing elements.
    Type: Grant
    Filed: October 14, 1998
    Date of Patent: January 11, 2000
    Assignee: Valmet Corporation
    Inventors: Juha Lahtinen, Pekka Kivioja, Vesa Nokelainen, Kari Holopainen, Juha Ehrola
  • Apparatus for drying fiber web
    Patent number: 6009634
    Abstract: An apparatus for drying a fiber web, in which apparatus the fiber web (5) is dried between two tight bands (1, 2) moving in the same direction and turning around turning rolls (6a, 6b, 7a, 7b). The first band (1) is heated by means of a pressure chamber (9) and the second band (2) is cooled by means of a water chamber (10). The fiber web (5) is led together with at least one felt or wire (3, 4) through a drying zone defined by the bands (1, 2) in such a way that the fiber web is in contact with the surface of the first band (1) and the felt or wire (3, 4) is between the fiber web (5) and the second band (2). At least one band (1, 2) is guided by a shoe (11a, 11b) in such a way that the fiber web substantially immediately upon coming into contact with the first band (1) is exposed to the effect of the compression pressure of the pressure chamber (9).
    Type: Grant
    Filed: October 17, 1997
    Date of Patent: January 4, 2000
    Assignee: Valmet Corporation
    Inventor: Elias Retulainen
  • Method and device for threading a paper web through a winding machine
    Patent number: 6010091
    Abstract: A method and device for winding a paper web in which the paper web is unwound from a paper reel, the end of the paper web is taken as a substantially full width from the reel and attached to a threading member which extends substantially over the entire length in the cross direction of the web. The threading member carries the end of the paper web through the winding machine so that the web is carried with a substantially uniform tension. The threading member is carried by draw fabrics placed in the cross direction in the area of the web.
    Type: Grant
    Filed: July 2, 1997
    Date of Patent: January 4, 2000
    Assignee: Valmet Corporation
    Inventors: Arto Leskinen, Jari Sinkko, Pauli Koutonen
  • Method for optimizing of evaporation drying of paper, runnability, and of paper quality as well as dryer section that makes use of the method in a paper machine
    Patent number: 6003245
    Abstract: A method and arrangement for evaporation drying of a paper web in which the web is dried in three successive stages I, II and III that are carried out in the direction of progress of the web as follows: in the first stage (I), the web is heated in a short section in the machine direction quickly to a temperature of 55.degree. C. to 85.degree. C.
    Type: Grant
    Filed: April 22, 1998
    Date of Patent: December 21, 1999
    Assignee: Valmet Corporation
    Inventors: Juha Lipponen, Martti Salminen, Juha Kaihovirta, Reima Kerttula