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Abstract

A method of making a shaped cellulosic paper or paperboard, comprising the steps of: (a) diluting cellulosic fibers with water to form an aqueous suspension of less than 10 percent by weight cellulosic fibers; (b) agitating the aqueous suspension of cellulosic fibers until the fibers become separated from each other and swollen; (c) dewatering the aqueous suspension to at least 20 percent weight cellulosic fibers; (d) preparing a homogeneous, plastically formable material by adding to the suspension sufficient hydrocolloid to bind substantially all of the water in the material to prevent the water from bleeding out during subsequent shaping and to prevent the fibers from flocculating, and by kneading the material, said material containing water in the range of from about 50 to about 90 percent, fibers in the range of from about 8 to 49 percent, and hydrocolloid in the range of from about 1 to about 20 percent, by weight; (e) shaping the material by extrusion, injection molding, rolling, pressing or drawing, and (f) bonding the solids of the material by drying the shaped material.

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First Claim