in the following embodiment only the essential procedural and installation components are to be described in greater detail . other associated procedural steps and installation components will emerge naturally from fig1 with reference to the known prior art . whole soya beans enter steaming apparatus 1 and then a fixed or fluidised bed 2 for conditioning , as described for example in de - c - 3544387 . the soya beans are heated in the steaming apparatus 1 by means of contact heat and in the fluidised bed 2 they are subjected to continuous heating in a hot gas flow at an average temperature of 70 ° c . to 90 ° c . on completion of heating the beans have a moisture content of 10 - 11 % hulls which are already loosened are separated from the beans both in the steaming apparatus 1 and in the fluidised bed 2 in a known manner . the beans prepared enter a heating receptacle , not illustrated here , ( interim depot ) or directly enter a rough - grinding roller frame 3 . this rough - grinding roller frame 3 contains two directly superposed roller pairs 4 , 5 which create a double - grinding step , as described for example in ep - c - 335925 . the roller pairs 4 , 5 display serrated rollers . the ground beans then reach a baffle individualizer 6 and then a hull separator 7 , where the hulls are completely separated from the broken beans . the separated hulls can be subjected to further sifting in an air stream . this is then followed by a device for flaking in a flaking mill and / or continued grinding in a fine milling device . referring to fig2 , the hull separator 7 comprises a substantially cylindrical housing 701 having an upper material inlet 702 and a lower material outlet 703 , as well as a lower gas inlet 704 and an upper gas outlet 705 for passing the crushed beans through in the countercurrent . in the process the beans are not only aspirated , but all loose hulls are also carried away in the gas stream . the material inlet 702 contains a delivery chute 706 via which the beans ( and hulls ) impact a first conical baffle 707 arranged concentrically to the delivery chute 706 in a circular manner . loose hulls and light particles are taken away by the gas stream flowing in the opposite direction . on the other hand the bean constituents roll down the conical surface of the baffle 707 and fall into an underlying hopper 708 . projecting into the open floor 709 of the hopper 708 is another underlying conical baffle 710 . due to the effect of gravity the beans and hull constituents roll from hopper 708 onto the conical surface of the second baffle 710 and from there into the other underlying hopper 711 . in the process other hull constituents can be removed with the gas flow . projecting underneath this hopper 711 into the floor 712 of the second hopper 711 is another such baffle 713 . a third and fourth baffle follow in a similar manner . the fourth baffle 713 has a similar hopper with an open floor 714 . a fifth conical baffle 715 protrudes into this floor 714 , as described hereinabove . this displays beneath its conical surface a cylindrical jacket surface 716 , such that this baffle 715 covers the concentrically arranged opening 717 of the gas inlet 704 . only baffle 707 exhibits a closed conical baffle surface , as compared to the tips of the upper baffles which are open at the top to enable the gas to flow through in the direction of the hopper and the overlying baffle . the conical opening of the delivery chute 706 or parts of the delivery chute 706 can be height - adjusted to the baffle 707 ( or the baffle also ) in order to regulate the influx of beans as required . highly efficient aspiration of the bean goods and efficient separation of the hulls is achieved by this cascading impacting arrangement . at least two , three or more baffles can be provided in exemplary embodiments . it will be appreciated by those skilled in the art that the present invention can be embodied in other specific forms without departing from the spirit or essential characteristics thereof . the presently disclosed embodiments are therefore considered in all respects to be illustrative and not restricted . the scope of the invention is indicated by the appended claims rather than the foregoing description and all changes that come within the meaning and range and equivalence thereof are intended to be embraced therein .