FEEDING SYSTEM AND METHOD FOR FEEDING COMMINUTED CELLULOSIC MATERIAL TO A HIGH-PRESSURE TREATMENT ZONE

The invention relates to a system and a method for feeding comminuted cellulosic material from a low-pressure zone (P L) to a high-pressure zone (PE) with at least 1 bar higher pressure. The invention uses a screw7 feeder having a feeding screw (1) arranged in a feeding pipe (2). Back blow pulses from the high-pressure zone that may blow7 backwards from the high-pressure zone (PE) can be ventilated (VentII) in an intermediate part (Pc) of the feeding pipe (2)， and thus not reach the low7-pressure zone.