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. 30, 2002
Filed:
Jul. 31, 2000
Roine Andersson, Furusund, SE;
Lars-Göran Rundqvist, Tumba, SE;
Jan Backman, Järälla, SE;
GL& V Sweden AB, Stockholm, SE;
Abstract
In a pressure screening device for separating undesired particles from a fibre suspension a cylindrical screen ( ) is provided. The screen has an outer side and an inner side and is provided with a plurality of projections ( ) on the outer side of the screen ( ) which extend in the circumferential direction of the screen ( ), grooves ( ) formed on the inner side of the screen ( ) and extending in a direction having an axial component, and screening passages in the form of slots ( ) disposed in the area of each groove ( ) and diverging from the inner side of the screen ( ) towards its outer side. According to the invention, the projections ( ), grooves ( ) and slots ( ) of the screen ( ) are produced by working of a substantially planar screen plate bent into cylindrical shape subsequent to the working. Thereby it is possible to form a screen ( ) having uniform slots ( ), the width of which at the inner side of the screen ( ) is only about 0.1 mm. The invention also relates to a method of manufacturing such a screen ( ).