METHOD FOR PRODUCTION OF PAPER MASS Russian patent published in 2011 - IPC D21H11/00 D21H17/67 D21H17/70 D21F1/66 C01F11/18 

FIELD: textile, paper.

SUBSTANCE: method includes preparation of water dispersion of cellulose fibres. Addition of calcium hydroxide in it at specified ratio in dispersion of cellulose fibres. Further treatment of dispersion with carbon dioxide in process of mixing until calcium hydroxide is fully transformed into calcium carbonate to produce paper mass. The latter comprises cellulose fibres, modified with chemically deposited chalk. At the same time calcium hydroxide is added into dispersion in amount, in conversion to calcium carbonate, equal to its specified percentage content in dry substances of paper. Dispersion of cellulose fibres is prepared with addition of return water of paper-making machine, and dispersion is treated with carbon dioxide after addition of return water to it. Paper mass is produced with specified content of components in it without account of solid substances added in it with return water. Cellulose fibre is selected from row including sulfite, sulfate cellulose, their mixture, leached wood mass of high yield on the basis of fibrillated fibres containing cellulose, hemicellulose and lignin.

EFFECT: increased strength of paper from produced paper mass due to use of closed cycle of water circulation.

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