Process for the production of paper and board
AssigneeAkzo Nobel Chemicals International B.V.
InventorPatrik Simonson
Life of this patent
Estimating the term…
Abstract
The present invention relates to a process for the production of paper and board which comprises: (a) introducing one or more fillers, one or more anionic polysaccharides and one or more cationic agents into a mixing zone to form a filler composition; (b) introducing by means of a pump the filler composition into an aqueous suspension comprising cellulosic fibers; and (c) dewatering the obtained suspension. The present invention also relates to a process for the production of a filler composition which comprises: (a) introducing one or more fillers, one or more anionic polysaccharides and one or more cationic agents into a mixing zone to form a filler composition; (b) introducing by means of a pump the filler composition into a storage tank.
Claims24
A process for the production of paper and board which comprises:
- (a) introducing one or more fillers, one or more anionic polysaccharides and one or more cationic agents into a mixing zone to form a filler composition, wherein
- (i) the one or more fillers and the one or more anionic polysaccharides are mixed in the mixing zone to form a filler pre-mix and then the one or more cationic agents are introduced into the mixing zone to form the filler composition, and/or
- (ii) the one or more fillers and the one or more anionic polysaccharides are mixed in a filler pre-mixing zone to form a filler pre-mix and then introducing the filler pre-mix into the mixing zone;
- (b) introducing by means of a pump the filler composition into an aqueous suspension comprising cellulosic fibers;
- and
- (c) dewatering the obtained suspension,
- wherein said process further comprises:
- (d) providing a thickness specification for the paper or board to be produced;
- (e) measuring the thickness of the paper or board being produced,
- (f) comparing the measured thickness with the thickness specification to identify any difference in thickness;
- and
- (g) reducing the thickness difference to provide paper or board meeting the thickness specification by adjusting the dosage of filler composition and thereby adjusting the filler content of the paper or board.
A process for the production of paper and board which comprises:
- (a) introducing one or more fillers, one or more anionic polysaccharides and one or more cationic agents into a mixing zone to form a filler composition;
- (b) introducing by means of a pump the filler composition into an aqueous suspension comprising cellulosic fibers;
- and
- (c) dewatering the obtained suspension;
- wherein said process further comprises:
- (d) providing a thickness specification for the paper or board to be produced;
- (e) measuring the thickness of the paper or board being produced,
- (f) comparing the measured thickness with the thickness specification to identify any difference in thickness;
- and
- (g) reducing the thickness difference to provide paper or board meeting the thickness specification by adjusting the dosage of filler composition and thereby adjusting the filler content of the paper or board.
Dependencies are inferred from the claim text.