Patents by Inventor Vesa Ijäs

Vesa Ijäs 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 leading a web between calendar nips, and a calendar
    Patent number: 6694870
    Abstract: In the method for leading a web between calendar roll nips (N), a web (W) is guided between the calender roll nips (N) in a loop which runs apart from the calender rolls, inside which loop an air pocket (3) is formed. The mass and/or beat flow in the air pocket (3) is prevented in the cross direction of the web by means of obstacles (5) placed in connection with the pocket.
    Type: Grant
    Filed: December 14, 2001
    Date of Patent: February 24, 2004
    Assignee: Metso Paper, Inc.
    Inventors: Reijo Pietikäinen, Vesa Ijäs, Pekka Koivukunnas
  • Method for controlling the moisture of a web in machine direction on a coating machine and calender
    Patent number: 6584703
    Abstract: The invention relates to a method by means of which the machine-direction moisture of a web being calendered or coated and calendered can be controlled in an optimal manner that takes into account moisture content changes along the entire path of the coating and drying process. Advantageously, all the dryers and the calender of the coater section are controlled in an integrated manner in order to obtain a controlledly processed product which is optimized in regard to energy consumption and product quality. Each process section and unit contributing to the drying of the web is identified by means of a mathematical submodel describing the specific evaporation rate in the respective process section/unit and, by chaining these submodels, a composite model is compiled for the entire process, whereby the composite model makes it possible to manage the drying operation in the process so that the individual units are controlled as a portion of the overall process.
    Type: Grant
    Filed: October 1, 2001
    Date of Patent: July 1, 2003
    Assignee: Metso Paper, Inc.
    Inventors: Tapio Mäenp{umlaut over (aa)}, Vesa Ijäs
  • Method for calendering a paper web and calender applying the method
    Patent number: 6289797
    Abstract: Method in calendering of a paper web in which the paper web is conveyed through a calendering nip formed by two calender rolls, at least one of which is a soft-faced roll having a coating of a resilient or polymeric material, or over which a belt of resilient or polymeric material is directed and passed through the nip. The profile of the calendering nip is controlled to compensate for defects in the web entering the calender. The profile control is accomplished by changing the diameter of the soft-faced roll zonewise by a profile control device arranged inside the body and performing temperature profiling. The profile control device include temperature control elements such as heating elements located in zones for heating a heat transfer medium such as air supplied into the body.
    Type: Grant
    Filed: March 12, 1999
    Date of Patent: September 18, 2001
    Assignee: Valmet Corporation
    Inventor: Vesa Ijäs