Patents by Inventor Vesa Ijas

Vesa Ijas 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).

  • 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 for controlling curl of paper in a dryer section of a paper machine and a paper or board machine
    Patent number: 5983523
    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%. The paper or board machine includes at least a headbox, a former, a press, and a dryer section in steam boxes or moistening devices are employed for control of the curl. There are at least two curl regulation devices to enable regulation of the curl in a number of stages, and/or the curl regulation devices are arranged to operate in an area in which the web temperature is, during at least one stage lower than 85.degree. C., preferably lower than 75.
    Type: Grant
    Filed: March 27, 1998
    Date of Patent: November 16, 1999
    Assignee: Valmet Corporation
    Inventors: Vesa Ijas, Karj Juppi, Pasi Ahonen, Jaakko Kallioniemi
  • Paper machine roll with heated ends in a soft calender or supercalender and method for calendering a web
    Patent number: 5932069
    Abstract: A paper machine roll, in particular for a soft calender or supercalender, which includes a metal frame, roll ends, and shafts. The frame is coated with a polymer coating over at least a middle area or central region thereof while lateral regions may optionally remain uncoated. In order to equalize a difference in temperature between the roll ends and the optionally non-coated lateral regions of the metal frame, on one hand, and the coated central region area of the roll, on the other hand, an arrangement for equalizing the difference in temperature is provided by heating the roll ends and the optionally non-coated lateral regions of the metal frame.
    Type: Grant
    Filed: March 24, 1997
    Date of Patent: August 3, 1999
    Assignee: Valmet Corporation
    Inventors: Harri Kuosa, Markku Kyytsonen, Rob Stapels, Vesa Ijas, Jouko Meronen, Risto Vainio, Markku Kirvesmaki