Process for manufacturing of formed products
First Claim
1. A method of making a shaped, smooth-surfaced cellulosic paper or paper board article from an aqueous suspension of cellulose fibers, the fibers having been agitated in water so as to become separated from each other and swollen, comprising the steps of:
- (a) 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 it 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 about 49 percent, and hydrocolloid in the range of from about 1 to about 20 percent, by weight;
(b) shaping the material into the desired shape by extrusion, injection molding, rolling, pressing or drawing; and
(c) forming hydrogen bonds between the solids of the material by drying the shaped material.
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Accused Products
Abstract
A method of making a cellulosic paper or paperboard by agitating an aqueous suspension of cellulose fibers until they become separated from each other and swollen. A sufficient amount of hydrocolloid is added to bind the water in the suspension such that no water will bleed out during a subsequent shaping. The mixture is kneaded until a homogeneous, plastically deformable mixture is formed. The mixture contains about 50-90% water, fibers in excess of about 8% and hydrocolloid in excess of about 1% by weight. The mixture is shaped by extrusion, rolling, pressing or drawing.
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Citations
16 Claims
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1. A method of making a shaped, smooth-surfaced cellulosic paper or paper board article from an aqueous suspension of cellulose fibers, the fibers having been agitated in water so as to become separated from each other and swollen, comprising the steps of:
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(a) 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 it 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 about 49 percent, and hydrocolloid in the range of from about 1 to about 20 percent, by weight; (b) shaping the material into the desired shape by extrusion, injection molding, rolling, pressing or drawing; and (c) forming hydrogen bonds between the solids of the material by drying the shaped material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A method of making a shaped, cellulosic paper or paper board article from an aqueous suspension of cellulosed fibers, the fibers having been agitated in water so as to become separated from each other and swollen, comprising the steps of:
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(a) 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 it from bleeding out during subsequent shaping and to prevent the fibers from flocculating, and by kneading the material, said preparation and kneading taking place at a temperature in excess of about 20°
C. sufficient to soften the material said material containing from about 50 to about 90 percent water, fibers in excess of about 8 percent, and hydrocolloid in excess of about 1 percent by weight;(b) shaping the material into the desired shape by extrusion, injunction molding, rolling, pressing or drawing, said shaping taking place while the material remains softened; and (c) forming hydrogen bonds between the solids of the material by drying the shaped material.
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Specification