Process for the production of paper
AssigneeAkzo Nobel N.V.
InventorsCaroline Westman, Tom Lindstrom, Janne Laine, Maria Norell
Life of this patent
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Abstract
A process for the production of paper from an aqueous suspension containing cellulosic fibers, and optional fillers, which comprises draining the suspension to obtain a paper web and subjecting the obtained paper web to impulse pressing by passage through at least one press nip having at least one heated roll which is in contact with the web and heated to a temperature above 100° C., wherein a chemical system comprising a polymer component and micro- or nanoparticles are added to the suspension or the paper web before the paper web passes the press nip of the impulse unit.
Claims30
A process for the production of paper which comprises:
- (i) forming an aqueous suspension containing cellulosic fibres, and optional fillers;
- (ii) draining the suspension to form a paper web;
- (iii) subjecting the obtained paper web to impulse pressing by passage through at least one press nip having at least one heated roll which is in contact with the paper web and heated to a temperature above 100° C.;
- wherein at least one polymer and micro- or nanoparticles are added to the suspension or the paper web before the paper web passes the press nip.
A process for the production of paper which comprises:
- (i) forming an aqueous suspension containing cellulosic fibers, and optional fillers;
- (ii) adding to the suspension from 0.01 to 50 kg/tonne, based on dry cellulosic fibers and optional filler, of at least one organic polymer and from 0.01 to 10 kg/tonne, based on dry cellulosic fibers and optional filler, of silica-based particles;
- (iii) draining the obtained suspension to form a paper web;
- and
- (iv) passing the paper web through one or more press nips having one or more heated rolls with a temperature above 100° C. wherein the paper web is contacted with said one or more heated rolls.
A process for the production of paper which comprises:
- (i) forming an aqueous suspension containing cellulosic fibers, and optional fillers;
- (ii) adding to the suspension from 0.01 to 50 kg/tonne, based on dry cellulosic fibers and optional filler, of at least one organic polymer and from 0.001 to 25 kg/tonne, based on dry cellulosic fibers and optional filler, of a micro- or nanoparticulate material;
- (iii) dewatering the obtained suspension to form a paper web having a dry solids content within the range of from about 20 to about 70%;
- and
- (iv) contacting the obtained paper web with one or more heated rolls in a press nip, the rolls being heated to a temperature above 100° C.
Dependencies are inferred from the claim text.