Patents by Inventor Jaana Ahlroos

Jaana Ahlroos 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 and an apparatus for coating paperboard with a coating mix having a high solids content
    Patent number: 6303187
    Abstract: A method and apparatus for producing paperboard, the method comprising the steps of applying a coating mix layer having a thickness greater than that of the final coat thickness to the surface of the web being coated using a coating mix formulation in which the solids content is at least 55%, passing the web with the coat applied thereto to a doctor blade located downstream in the travel direction of the web at a distance from the applicator apparatus such that the dwell time from the application step of the coating mix to the doctoring step is at least 130 ms, and smoothing the coat layer to its final thickness by means of a doctor blade. By this method a smooth surface can be obtained even on high coat weights.
    Type: Grant
    Filed: November 23, 1999
    Date of Patent: October 16, 2001
    Assignee: Valmet Corporation
    Inventors: Mika Leino, Stefan Kuni, Jukka Linnonmaa, Jaana Ahlroos, Erja Nikula