Patents by Inventor Jaakko Sarantola

Jaakko Sarantola 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: 4986883
    Abstract: A method for calendering paper, especially with glassine calendering in a calender which comprises press rolls arranged successively in the paper-advancing direction where, at least between some of the rolls, press nips are formed for passing paper therethrough. Each press nip is preferably formed by a pair of rolls, one of which is hard and the other elastic. Paper is advanced into the calender at an initial moisture X within the range of 12% .ltoreq..times..ltoreq.25%, at least one of the press nips having a calculable line pressure higher than 250 kN/m. In operating conditions, the ratio X/LP between paper moisture X and calculable line pressure LP is maintained in the press nips within predetermined limits in such a manner that the maximum value of ratio X/LP divided by the minimum value of ratio X/LP is .ltoreq.2.15, whereby X refers to the moisture percentage of paper and LP is the line pressure at a particular press nip expressed as a quantity kN/m (kilonewton/meter).
    Type: Grant
    Filed: June 16, 1989
    Date of Patent: January 22, 1991
    Assignee: Yhtyneet Paperitehtaat Oy
    Inventors: Jyrki Taipale, Jaakko Sarantola