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:
Aug. 27, 1991
Filed:
Nov. 13, 1989
Rolf B Reinhall, Bellevue, WA (US);
Sunds Defibrator AB, Stockholm, SE;
Abstract
A method and apparatus is provided for conjoint or simultaneous adjustment of the gap spaces of the inner and outer grinding zones of a pulp refiner apparatus in a single step. The inner grinding zone is generally radially oriented, and merges into an outer inclined grinding zone. Pulp stock to be ground is introduced into a central inlet position and is accelerated through the inner and outer grinding zones by centrifugal forces generated by a pair of grinding members which rotate relative to one and other. The opposed surfaces of the relatively rotating members each carry a plurality of concentric rows of teeth, and the gap spacing of the inner grinding zone is defined between adjacent surfaces of the teeth. The adjacent teeth defining the inner grinding zone are arranged so that adjustment of the gap space of the outer grinding zone simultaneously controls the gap spacing of the inner grinding zone without the need for separate adjustment. Retarding rings are provided adjacent to the concentric rows of teeth to prevent pulp from by-passing the grinding spaces between adjacent teeth.