The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 23, 1998
Filed:
Dec. 11, 1995
Applicant:
Inventors:
Esa Lehtovirta, Jyvaskyla, FI;
Jorma Kolio, Jyvaskyla, FI;
Markku Salo, Muurame, FI;
Kari Luostarinen, Jyvaskyla, FI;
Assignee:
Valmet Corporation, Helsinki, FI;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D21G / ;
U.S. Cl.
CPC ...
100 38 ; 100336 ; 162206 ;
Abstract
A method for reducing or preventing vibrations of a roll set of a paper making apparatus, wherein the roll set comprises at least two rolls of which at least one is a soft roll coated with a compressible coating and comprising a temperature control system. The natural vibrational frequency of the roll set is changed during the operation of the apparatus by changing the temperature of the coating of at least one soft roll. The changing of the natural frequency prevents resonance on a natural frequency of the roll set.