METHOD AND A DEVICE FOR FORMING A FILTERING FIBER CAKE IN AN APPARATUS FOR MEASURING THE BEATING EE OF PULP FLOWING THROUGH A CONDUIT

This invention provides a method and a device in an apparatus for measuring the beating degree of pulp. According to the invention the sample of pulp is treated by a rotating flow of fluid having a pressure lying over the pressure in the conduit during a stirring and/or a dilution period in connection with the withdrawal of the sample and when the sample is withdrawn from the pulp flowing through the conduit the pressure of the flow of fluid is lowered to a predetermined value, which is adapted to the deposit process of the sample of pulp. The fiber cake is deposited onto the strainer disc in an evenly distributed layer, so that a better reproducability in the function of the apparatus is achieved. Besides a more simple construction which can be manufactured cheaper than what has been the case before, one also gets a better guidance of the piston in the cylinder. The cleaning of the injection nozzles has also been essentially simplified and effectivized.