Method of preparing a pulp

Details Method of preparing a pulp Method of preparing a pulp

D - Textiles, Paper

21

C

9/2

D21C 1/10 (2006.01) D21B 1/16 (2006.01) D21C 1/00 (2006.01) D21C 1/06 (2006.01) D21C 5/00 (2006.01)

Patent

CA 1327104

A METHOD OF PREPARING A PULP ABSTRACT OF THE DISCLOSURE A method of preparing a pulp for digestion in a continuous process from a fiber-containing cellulose material is described. It com- prises the following sequential steps: a) preimpregnating said fiber material by mixing it with cooking liquor so as to form a fiber suspension having a fiber concentra- tion of about 5-15 percent by weight, b) impregnating and fluidizing said fiber suspension under a pres- sure above atmospheric pressure by feeding the fiber suspension into a centrifugal pump comprising fluidization means exerting shearing forces on the fiber suspension so as to separate and at least partially disintegrate fiber bundles from each other, c) feeding said fiber suspension to a press by means of said centrifugal pump while continuing said pressure impregnation of the fiber material with cooking liquor from the fiber suspension, d) thickening said fiber suspension by dewatering it in said press while subjecting the fiber suspension to a final impregnation under a pressure above atmospheric pressure so as to form a substantially completely impregnated pulp having a fiber concentration of about 20 to 40, preferably 20 to 30, percent by weight, and e) feeding the resultant pulp into a digester by means of the pressure created mainly or completely by the centrifugal pump.

601809

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