seen and device for impregnation of fibrous materials before cooking by pulsation of pressure between kokartryck and a legre pressure

摘要

An apparatus and method for impregnating fiber material with treatment liquid before treatment thereof in a high pressure vertical fiber material treatment vessel. Fiber material and treatment liquid under relatively low pressure flow in a first flow system, continuous withdrawal of liquid from the first system taking place. A second flow system of fiber material and treatment liquid, under relatively high pressure (the second flow system including an impregnation portion of the treatment vessel), is provided. Fiber material entrained in liquid in the first system is transferred to the second system, and the pressure thereof boosted, by a pocketed-rotor transfer device. Communication between the second system and the treatment vessel is selectively allowed or blocked by a valve disposed in a funnel-shaped conduit between the impregnation chamber of the treatment vessel and the treatment vessel, the pressure in the second system being substantially as high as the treatment vessel pressure when communication between the second system and the treatment vessel is allowed, and the pressure in the second system becoming significantly reduced when communication between the second system and the treatment vessel is blocked. The time that communication between the second system and the treatment vessel is allowed is effectively controlled so that the relative times that the second system is exposed to high and low pressure effects impregnation of fiber material with treatment liquid in the second system.