METHOD AND APPARATUS FOR CONTINUOUS PRODUCTION OF PULP Russian patent published in 1999 - IPC

FIELD: pulp-and-paper industry. SUBSTANCE: apparatus has vessel containing cooking solution and having first zone (impregnation zone) and second zone (abrasion zone). Method involves continuous feeding of wood chips to upper part of first zone for mild mode mixing for saturating wood chips with solution; supplying impregnated wood chips to second zone for heating to temperature below 125 C and subjecting to more intensive mixing for further grinding and releasing discrete fibers; maintaining liquid in first zone at higher level than in second zone for creating ascending liquid flow in second zone, with cooking solution being continuously discharged from upper part of second zone; continuously discharging discrete fibers while holding larger wood chips in second zone for further abrasion; withdrawing discrete fibers from cooking mode as they are released. EFFECT: increased efficiency by preventing pulp from overcooking and decolorization. 14 cl, 1 dwg