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:
Jul. 01, 2014
Filed:
May. 03, 2006
Auli Laurila-lumme, Lohja, FI;
Markku Leskelä, Lohja, FI;
Kristiina Manninen, Lohja, FI;
Ole Nickull, Tammerfors, FI;
Isto Nikamaa, Kouvola, FI;
Marko Pekkola, Lappeenranta, FI;
Maija Pitkänen, Jyväskylä, FI;
Pirita Suortamo, Palokka, FI;
Kai E. J. Vikman, Lohja, FI;
Auli Laurila-Lumme, Lohja, FI;
Markku Leskelä, Lohja, FI;
Kristiina Manninen, Lohja, FI;
Ole Nickull, Tammerfors, FI;
Isto Nikamaa, Kouvola, FI;
Marko Pekkola, Lappeenranta, FI;
Maija Pitkänen, Jyväskylä, FI;
Pirita Suortamo, Palokka, FI;
Kai E. J. Vikman, Lohja, FI;
M-real Oyj, Espoo, FI;
Abstract
Method for the production of mechanical or chemi-mechanical pulp as raw material for paper or cardboard. According to this method, the pulp is fibrillated and the fibrillated pulp is bleached in alkaline conditions. According to the present invention, the pulp is screened to separate the reject from the accept, at maximum approximately 60% of the total amount of pulp is separated as the reject, the reject is bleached separate from the accept, and, after that, the bleached reject is remixed with the accept. When operating according to the present invention, the strength of the pulp increases and the energy used for refining is reduced, which is seen both in the refining of the reject and in the post-refining of the final mechanical pulp.