may cause a non uniform chip column movement as a more rapid flow in the centre of the digester may be developed towards the central outlet bucket 52 compared with chip column movement close to the digester walls while fig1 only discloses the basic features of conventional continuous digester it is to be understood that the system could be modified in a number of ways for example the number of circulations could be more than those shown in fig1 the heating devices 40 41 could either be heaters using direct heating with steam i e mixing steam into the circulation or heat exchangers in fig2 is a detail view of the bottom scraper shown in fig1 but here modified according the inventive concept the bottom scraper comprises the drive shaft 70 the scraper arms 71 and a cone diverter 72 all co rotating as one common unit the pulp descending down the vessel in a plug flow is broken up by the bottom scraper and paddles 73 push the pulp towards the outlet bucket 52 before being fed out via the blow line bl during this process is dilution wash liquid dl added via horizontal and vertical nozzles the upper inclined surface of the cone diverter 72 has an inclination angle u03b1 in the range 30 u00b1 10 degrees in relation to the vertical here indicated as the centre line cl according to the invention is the upper inclined surface equipped with draining apertures in fluid communication with a liquid receiving chamber cc inside the cone diverter said liquid receiving chamber connected to a drainage channel 70 a to the exterior of said vessel in this first.