shown in fig5 a further possibility is illustrated in fig8 where the pulp is fed in on both sides through the inlet 1 a and 1 b respectively towards the shaft and deflected into the pulp feed channel 7 by the disc 8 from there the pulp enters the refining gap 3 on both sides and is discharged centrally through the outlet 4 the same pulp routing is also possible with a twin cone which can be designed as a widening or a narrowing cone from the outer inlet to the center outlet taking the example of a refiner with twin rotor and axial inlet 1 designed as a hollow shaft fig9 shows a combination of cylindrical and conical refining zones in addition to the variant shown the pulp can also flow in on two sides through the inlet with deflection by a disc and the outlet can be located centrally fig1 to 13 illustrate the combination of cylindrical and conical refining zones on one rotor in this case the pulp can either flow through the cylindrical part fig1 fig1 or through a conical part fig1 fig1 first where the cone has either a widening fig1 fig1 or narrowing fig1 fig1 shape the definition of widening or narrowing for the shape of the cone is always determined by the flow direction of the pulp 0036 fig1 shows a section according to line a a in fig5 here the internals 12 also known as vane or blade can be seen these internals 12 divide the pulp feed cannel 2 into separate pulp feed channels 2 u2032 through which the pulp suspension is.