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:
Oct. 26, 2010
Filed:
Jun. 05, 2006
Mikael Lucander, Esbo, FI;
Tomas Björkovist, Tampere, FI;
Olli Tuovinen, Tampere, FI;
Metso Paper, Inc., Helsinki, FI;
M-real Oyj, Espoo, FI;
Myllykoski Oyj, Helsinki, FI;
Stora Enso Oyj, Helsinki, FI;
UPM Kymmene Oyj, Helsinki, FI;
Abstract
The present invention provides a novel method and apparatus for producing pulp from lignocellulosic raw material, such as wood or annual or perennial plants, by mechanical defibration. According to the invention, fibers are peeled from the wood by means of grinding grits arranged on a defibration surface, wherein at least 90% of the protrusion difference distribution between adjacent or neighboring grits on the surface belongs to a value region maximally as wide as the average grit diameter. By means of the invention, a reduction in specific energy consumption of up to 50% or even more can be obtained.