The way to increase the speed of dehydration and improve the retention of fines during the manufacture of paper

 

The method relates to speed up dehydration and improve the retention of fines, which is effective in not containing a filler of fibrous mass without silica and particles of bentonite compounds, preventing type and can be used in the pulp and paper industry in the manufacture of newsprint. In the paper mass is added cationic or amphoteric starch, cationic polyelectrolyte and high molecular weight anionic polyacrylamide copolymer sequentially or in combination. The technical result is the improvement of conditions for the process of making paper. 6 C.p. f-crystals, 9 PL.

Description text in facsimile form (see graphic part) Tn

Claims

1. The way to increase the speed of dehydration and improve the retention of fines during the manufacture of paper using fibrous materials based on wood pulp, containing no fillers and containing no silica and bentonite, in the paper manufacturing process, while maintaining listonline properties, comprising the following stages: (A) adding to the aqueous fibrous mass, sotiriadou cationic polyelectrolyte and then B) adding to this aqueous fibrous mass, contains the original pulp, as well as cationic or amphoteric starch and cationic polyelectrolytes, anionic high-molecular acrylamide copolymer, where the molecular mass of this anionic acrylamide copolymer exceeds about 10000000.

2. The method according to p. 1, in which the cationic or amphoteric starch is chosen from the group comprising potato starch, the starch from dent corn starch from waxy maize.

3. The method according to p. 2, in which the degree of Quaternary ammonium substitution of the starch is in the range from about 0.1 to 0.4%.

4. The method according to p. 1, in which the cationic polyelectrolyte is selected from a range, including epichlorohydrin-dimethylamine polymeric condensation products, epichlorohydrin-dimethylamine-ethylendiamine polymeric condensation products, diallyldimethylammoniumchloride, polyethylenimine, polyamidoamine, alum and polyaluminium.

5. The method according to p. 1, in which acrylamide copolymer is an essentially linear copolymer of acrylamide /sodium acrylate.

6. The method according to p. 1, in which acrylamide copolymer is an essentially linear acrylamide/2-acrylamide-2-methylpropanesulfonate copolymer is in the range of about 20-70%.

 

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