shaft 14 so as to define therewith an annular gap part of which includes the gap 20 shown most clearly in fig2 extending angularly between the pair of sealing means 21 referred to below each of the filled rolls includes also a support means supporting the shell 12 for rotation around the stationary shaft 14 and in the illustrated example this support means takes the form of a pair of end bearings 15 one of which is shown in fig3 these bearings 15 support the shell 12 and the structure carried thereby for free rotary movement with respect to the stationary shaft 14 as will be apparent from the description which follows each filled roll 10 of the invention is provided with a pair of deflection compensating means which respectively act in different angular zones around the common axis of the shaft 14 and shell 12 one of these deflection compensating means compensates for the weight of the filled roll for this purpose the shaft 14 is formed at its uppermost part with an elongated axially extending groove which slidably and fluid tightly receives an elongated pressure member 13 which is capable of sliding fluid tightly in this groove toward and away from the common axis of the shaft 14 and shell 12 so that this pressure member 13 acts in the manner of a piston which is acted upon by a fluid under pressure as described below between the pressure member 13 and the inner surface of the shell 12 there is an elongated slide shoe 22 having an exterior surface of the same curvature as the inner surface of the shell 12 and slidably engaging this latter.