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:
Feb. 04, 2014
Filed:
Nov. 19, 2010
Johan Engstrom, Grankulla, FI;
Jussi Piira, Helsinki, FI;
Janne Vehmaa, Siltakylä, FI;
Veli-pekka Tervola, Espoo, FI;
Aaron Leavitt, Alpharetta, GA (US);
Johan Engstrom, Grankulla, FI;
Jussi Piira, Helsinki, FI;
Janne Vehmaa, Siltakylä, FI;
Veli-Pekka Tervola, Espoo, FI;
Aaron Leavitt, Alpharetta, GA (US);
Andritz Technology and Asset Management GmbH, Graz, AT;
Abstract
A method to cook thin chips in a continuous digester vessel including: introducing thin chips having a thickness of no more than 6 mm, into a chip bin; adding white (cooking) liquor to the chip bin or to a chip transport passage extending from the chip bin to an upper inlet of the continuous digester vessel; injecting medium pressure steam or another heated fluid to an upper region of the digester vessel to elevate a cooking temperature of the chips in the vessel to at least 130 degrees Celsius; cooking the chips in the vessel as the chips flow downward through the vessel without substantial extraction or introduction of liquor in the cooking section of the vessel; injecting wash liquid to a lower region of the vessel; extracting at least wash liquid through a wash liquid extraction screen in the lower region of the vessel and above the injection of the wash liquid, and discharging the cooked thin chips from the lower region of the vessel.