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:
Oct. 16, 1984
Filed:
Sep. 22, 1982
Anders I Andersson, Hammaro, SE;
Aktiebolaget Karlstads Mekaniska Werkstad, Karlstad, SE;
Abstract
In the production of multi-ply paper in a twin-wire former of the kind in which the wires define a curved forming zone, preferably a former of roll type with a smooth-faced forming roll, a substantially improved layer purity is produced in that the discharges from a first and at least succeeding portion of the curved forming zone are collected separately as different fractions. The first fraction collected nearest the multilayer headbox is returned in a first separate circuit to be used for diluting a first high consistency pulp to a first stock of headbox consistency, from which stock a first layer is to be formed directly on the outer wire in relation to the curved forming zone. At least a portion of a second fraction collected at a greater distance from the multilayer headbox is returned in a second separate circuit to be used for diluting a second high consistency pulp to a second stock of headbox consistency, from which a second layer is to be formed superimposed on the first layer.