Fibrous-reinforced sheet

Details Fibrous-reinforced sheet Fibrous-reinforced sheet

1993-04-08

1998-04-07

Weisberger, Richard

Paper making and fiber liberation

Processes and products

Utilizing non-aqueous suspending medium

162145, 162146, 1621641, 1621682, 1621683, D21H 518

Patent

active

057360081

ABSTRACT:
A process for forming a highly filled, fibrous-reinforced sheet in which the sheet is formed from an aqueous dispersion of solids which include fibers, filler, and binder and cationic flocculating agent by continuously feeding a stream of such aqueous dispersion onto a moving porous support surface, wherein the filler comprises at least about 50 wt. % of the solids portion of the dispersion, the improvement comprising the use in the aqueous dispersion of a filler consisting essentially of calcium carbonate and a cationic polymeric flocculant having a charge-density of at least about 2 equivalents of cationic nitrogen per kilogram of polymer, and a highly-filled calcium carbonate-containing sheet, and the use of carbon black to impart opacity to paper or sheet that has a white appearance.

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