METHOD AND INSTALLATION FOR PREPARING FIBROUS PULP TO MANUFACTURE PAPER, PAPERBOARD, FIBERBOARDS, AND OTHER PRODUCE CONTAINING WOOD AND/OR OTHER VEGETABLE FIBERS Russian patent published in 1997 - IPC

FIELD: pulp-and-paper industry. SUBSTANCE: aqueous suspension of crude fibrous material is transferred through pressure pipeline system by means of pressure pumps, the pressure being gradually increased in direction from the beginning of process. When being transferred, suspension is repeatedly redehydrated and redeluted with process fluid. Installation has dehydration tube and dehydrating-gas withdrawing tube, the former being optionally provided with perforated part. The tube has holes through which gas and liquid may escape from fibrous suspension introduced into outside tube. On the end opposite to inlet end of outside tube, thickened fibrous suspension discharge tube is available. EFFECT: improved process flowsheet. 6 cl, 8 dwg , 1 tbl