Patents by Inventor Ilkka Hiirsalmi

Ilkka Hiirsalmi 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: 7017477
    Abstract: A method and arrangement for computing and regulating distribution of linear load in a multi-nip calender. A material web is passed through the nips in a set of rolls including a variable-crown upper roll, a variable-crown lower roll and intermediate rolls positioned between the upper and lower rolls. The rolls in the set of rolls are supported so that, when the nips are closed, the bending lines of the rolls are curved downwards. When computing and regulating the linear loads, one or more of the physical properties affecting the bending of each intermediate roll under load, such as bending rigidity, mass, shape, and material properties, are taken into account. The ratio of the linear loads applied to the intermediate rolls, the weight of the rolls per se, and/or the support forces applied to the rolls are regulated so that the set of rolls is in a state of equilibrium and a predetermined state of deflection.
    Type: Grant
    Filed: May 3, 1999
    Date of Patent: March 28, 2006
    Assignee: Metso Paper, Inc.
    Inventors: Mika Viljanmaa, Pekka Linnonmaa, Ilkka Hiirsalmi, Pekka Koivukunnas, Tapio Mäenpää, Erkki Leinonen, Pekka Kivioja, Juha Ehrola