Patent ID: 7381298
Filing Date: 2008-06-03
Classification: D21D,D21F

Abstract:
1. A process for making a paperboard comprising the steps of forming at least one high consistency first slurry of cellulosic fibers in an aqueous dispersion medium wherein said cellulosic fibers comprise crosslinked cellulosic fibers forming at least one second slurry comprising cellulosic fibers in an aqueous dispersion medium passing said high consistency first slurry through a screen with a hole diameter of at least 2 mm wherein said screen has a rotor for dispersing said high consistency slurry passing said second slurry of cellulosic fibers through a screen with a hole diameter of at least 1 mm forming one of said slurries of cellulosic fibers on a foraminous support forming the other of said slurries on said slurry formed on said foraminous support withdrawing liquid from said slurries formed on said foraminous support drying said formed slurries to form a paperboard.