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:
Dec. 28, 1999
Filed:
Feb. 17, 1998
Applicant:
Inventors:
Torbjorn Carlsson, L.ang.ngserud, SE;
Lennart Gustavsson, Karlstad, SE;
Assignee:
Kvaerner Pulping AB, Karlstad, SE;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
D21D / ; D21C / ;
U.S. Cl.
CPC ...
162252 ; 162272 ; 422185 ; 422242 ;
Abstract
Apparatus for safely carrying out pressurized peroxide bleaching of pulp in a bleaching vessel at a consistency exceeding 8%, the bleaching vessel designed for at least 0.5 MPa overpressure, with the pulp being pumped to the bleaching vessel through a mixer at a temperature exceeding 90.degree. C., wherein a bypass conduit is provided to bypass the mixer and wherein a valve is provided in the bleaching vessel, the valve opening when the pressure in the bleaching vessel or an affiliated part thereof reaches a first set point.