| 摘要 |
A method of preparing a pulp for digestion in a continuous process from a fiber-containing cellulose material is described. It comprises the following sequential steps: (a) preimpregnating the fiber material by mixing it with cooking liquor so as to form a fiber suspension having a fiber concentration of about 5-15 percent by weight, (b) impregnating and fluidizing the fiber suspension under a pressure above atmospheric pressure by feeding the fiber suspension into a centrifugal fluidizing pump which exerts shearing forces on the fiber suspension so as to separate and at least partially disintegrate fiber bundles, (c) feeding the fiber suspension to a press by means of said centrifugal pump while continuing the pressure impregnation of the fiber material with cooking liquor from the fiber suspension, (d) thickening the 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 under the pressure created mainly or completely by the centrifugal pump. |
