Patents by Inventor Mikko Karvinen

Mikko Karvinen has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 5653041
    Abstract: A method and device for drying a paper web wherein the paper web is supported on a drying wire without long open draws of the web. The paper web is contact-dried by pressing it with the drying wire onto a face of a contact-drying cylinder whose diameter is greater than about 1.5 m on a sector b whose magnitude is greater than about 180.degree.. The web is evaporation-dried as blowing-on drying and/or as through-drying by means of high-velocity drying-gas jets applied to the web on the drying wire on the face of the following large-diameter cylinder whose diameter is greater than about 2 m on a sector a having a magnitude greater than about 180.degree. while the web is on the side of the outside curve. The web to be dried is passed over a sector c of the suction roll which is subjected to negative pressure while the web is supported on the drying wire at the side of the outside curve. The magnitude of the sector of the suction roll has a magnitude greater than about 160.degree.
    Type: Grant
    Filed: December 20, 1994
    Date of Patent: August 5, 1997
    Assignee: Valmet Corporation
    Inventors: Antti Ilmarinen, Antti Kuhasalo, Pertti Heikkila, Heikki Ilvespaa, Jouko Yli-Kauppila, Ilkka Jokioinen, Matti Korpela, Mikko Karvinen, Pekka Taskinen, Henrik Petterson, Vaino Sailas, Dick Parker
  • Patent number: 5611892
    Abstract: A closed press section in a paper machine including a compact combination of press rolls, some of which define press nips with each other between which the web has a closed draw supported by the face of a fabric. The press section has a center roll in connection with which at least one press nip is formed. A closed loop of a transfer band is passed around the center roll. The web is transferred on an outer face of the transfer band after the last press nip in the compact combination of rolls as a closed and constantly supported draw onto a drying wire in a drying section following after the press section. The transfer band loop is preferably made of a fabric that substantially does not receive water and does not rewet the web. The web-adhesion properties of the outer face of the transfer band are chosen so that, after the last nip, the web follows the transfer band, and so that the web can be transferred as a fully closed draw onto the drying wire.
    Type: Grant
    Filed: October 6, 1994
    Date of Patent: March 18, 1997
    Assignee: Valmet Corporation
    Inventors: Mikko Karvinen, Reima Kerttula, Jorma Laapotti, Juhani Pajula
  • Patent number: 5611893
    Abstract: Method and device in the manufacture of paper or board for dewatering of a paper web that is being manufactured. The paper web is transferred from a forming wire onto a wire in the drying section while constantly on support of a fabric that receives water, a transfer fabric, or of any other, corresponding transfer surface as a closed draw, at a particularly high speed, which is higher than about 25-30 m/s. Dewatering of the paper web is carried out by means of at least two subsequent press nips, of which nips at least one press nip is a so-called extended-nip zone, whose length in a machine direction is larger than about 100 mm. The extended-nip zone is formed in connection with a mobile flexible press-band loop. The distribution of the compression pressure employed within said extended-nip press zone is regulated and/or selected both in the transverse direction of the web and in the machine direction so as to set or to control the different profiles of properties of the web.
    Type: Grant
    Filed: January 24, 1995
    Date of Patent: March 18, 1997
    Assignee: Valmet Corporation
    Inventors: Juhani Pajula, Martti Hipsimaki, Juha Kivimaa, Pekka Taskinen, Jorma Laapotti, Mikko Karvinen
  • Patent number: 5534116
    Abstract: The invention relates to a closed press section in a paper machine and comprises a compact combination of press rolls. Several of the rolls define press nips with each other, between which nips the web has a closed draw supported by the face of a fabric. The press section has a center roll in connection with which a press nip or press nips are provided. A closed loop of a transfer band is passed around the center roll. The web is transferred on an outer face of the transfer band after the last press nip in the compact combination of rolls as a closed and constantly supported draw onto a drying wire in a drying section following after the press section. The transfer band loop is made of a transfer band fabric that substantially does not receive water and does not rewet the web.
    Type: Grant
    Filed: October 20, 1994
    Date of Patent: July 9, 1996
    Assignee: Valmet Paper Machinery Inc.
    Inventors: Mikko Karvinen, Reima Kerttula, Jorma Laapotti, Juhani Pajula
  • Patent number: 5495678
    Abstract: A method and device for drying a paper web wherein the paper web is supported on a drying wire without long open draws of the web. The paper web is contact-dried by pressing it with the drying wire onto a face of a contact-drying cylinder whose diameter is greater than about 1.5 m on a sector b whose magnitude is greater than about 180.degree.. The web is evaporation-dried as blowing-on drying and/or as through-drying by means of high-velocity drying-gas jets applied to the web on the drying wire on the face of the following large-diameter cylinder whose diameter is greater than about 2 m on a sector a having a magnitude greater than about 180.degree. while the web is on the side of the outside curve. The web to be dried is passed over a sector c of the suction roll which is subjected to negative pressure while the web is supported on the drying wire at the side of the outside curve. The magnitude of the sector of the suction roll has a magnitude greater than about 160.degree.
    Type: Grant
    Filed: February 24, 1994
    Date of Patent: March 5, 1996
    Assignee: Valmet Paper Machinery, Inc.
    Inventors: Antti Ilmarinen, Heikki Ilvespaa/, Antti Kuhasalo, Jouko Yli-Kauppila, Pertti Heikkila/, Iikka Jokioinen, Matti Korpela, Henrik Petterson, Mikko Karvinen, Va/ ino/ Sailas, Pekka Taskinen, Dick Parker
  • Patent number: 5393383
    Abstract: The invention relates to a closed press section in a paper machine and comprises a compact combination of press rolls. Several of the rolls define press nips with each other, between which nips the web has a closed draw supported by the face of a fabric. The press section has a center roll in connection with which a press nip or press nips are provided. A closed loop of a transfer band is passed around the center roll. The web is transferred on an outer face of the transfer band after the last press nip in the compact combination of rolls as a closed and constantly supported draw onto a drying wire in a drying section following after the press section. The transfer band loop is made of a transfer band fabric that substantially does not receive water and does not rewet the web.
    Type: Grant
    Filed: March 2, 1993
    Date of Patent: February 28, 1995
    Assignee: Valmet Paper Machinery Inc.
    Inventors: Mikko Karvinen, Reima Kerttula, Jorma Laapotti, Juhani Pajula
  • Patent number: 5389205
    Abstract: Method and device in the manufacture of paper or board for dewatering of a paper web that is being manufactured. The paper web is transferred from a forming wire onto a wire in the drying section while constantly on support of a fabric that receives water, a transfer fabric, or of any other, corresponding transfer surface as a closed draw, at a particularly high speed, which is higher than about 25-30 m/s. Dewatering of the paper web is carried out by means of at least two subsequent press nips, of which nips at least one press nip is a so-called extended-nip zone, whose length in a machine direction is larger than about 100 mm. The extended-nip zone is formed in connection with a mobile flexible press-band loop. The distribution of the compression pressure employed within said extended-nip press zone is regulated and/or selected both in the transverse direction of the web and in the machine direction so as to set or to control the different profiles of properties of the web.
    Type: Grant
    Filed: March 5, 1993
    Date of Patent: February 14, 1995
    Assignee: Valmet Paper Machinery, Inc.
    Inventors: Juhani Pajula, Juha Kivimaa, Jorma Lapotti, Martti Hirsimaki, Pekka Taskinen, Mikko Karvinen
  • Patent number: 5240563
    Abstract: Closed press section in a paper machine, comprising a compact combination of press rolls. Certain of rolls define press nips with each other, between which nips the web has a closed draw supported by the face of a fabric. The press section has a center roll in connection with which a press nip or press nips are provided. A closed loop of a transfer band is passed around the center roll. The web is transferred on an outer face of the transfer band after the last press nip in the compact combination of rolls as a closed and constantly supported draw onto a drying wire in a drying section following after the press section. The transfer band loop is made of a transfer band fabric that substantially does not receive water and does not rewet the web. The web-adhesion properties of the outer face of the transfer band fabric are chosen so that, after the last nip, the web follows the transfer band fabric, and so that the web can be transferred as a fully closed draw onto the drying wire.
    Type: Grant
    Filed: February 3, 1992
    Date of Patent: August 31, 1993
    Assignee: Valmet Paper Machinery Inc.
    Inventors: Mikko Karvinen, Reima Kerttula, Jorma Laapotti, Juhani Pajula
  • 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: 4526655
    Abstract: A press section of a paper machine comprises, in the direction of web run, at least three separate press nips for removing water from a web, the web passing between two fabrics in each of the three nips. Dewatering of the web takes place through both faces of the web at least in the first press nip which is formed between two open-faced press rolls. The second and third press nips are formed between an open-faced roll and one of an open-faced roll and a smooth-faced roll. According to the invention, the press section includes two upper fabrics and two lower fabrics, the first upper and lower fabrics in the direction of web run being water-receiving press fabrics, one of which constitutes a press fabric only in the first press nip, the other fabric constituting a press fabric both in the first and second press nips. One of the second upper and lower fabrics is a water-receiving press fabric, the other being a water-non-receiving transfer fabric adapted to receive minimal amounts of water, if any.
    Type: Grant
    Filed: September 12, 1983
    Date of Patent: July 2, 1985
    Assignee: Valmet Oy
    Inventors: Mikko Karvinen, Jorma Laapotti
  • Patent number: 4464226
    Abstract: A dewatering press section for a paper or cardboard web includes a press roll having a wide pressing zone over which a belt is provided to run guided by guide rollers with the web being arranged to run in the pressing zone in compression between the press roll and the belt. At least one fabric runs in the pressing zone and acts on a respective face of the web. A pressure transmitting device has a surface which overlies the belt substantially in the pressing zone. According to the invention, ultrasonic field generators are provided in association with the pressure transmitting device surface for applying an ultrasonic field substantially in the pressing zone such that the friction between the surface of the pressure transmitting device and the belt is substantially reduced.
    Type: Grant
    Filed: May 13, 1982
    Date of Patent: August 7, 1984
    Assignee: Valmet OY
    Inventor: Mikko Karvinen