the other side wall of the groove 11 in the embodiment according to fig1 f the land sections 12 of the surface structure have been attached to the roll frame or center shaft with a support strip 18 this structure according to fig1 f has the advantage that the portions of metal and plastic can be optimized and the roll weight is also reduced and the renewal of the surface structure becomes easier fig1 g shows a preferable embodiment of the invention in which separate plate units are attached to one another or to the center shaft using friction of form closing attachments in the embodiment of fig1 g plate disks 12 and 19 of different size have been attached to the roll frame for example by a shrink fit whereby the alternately positioned plate disks form a surface grooving between them it is also possible to produce plate disks comprising the structure of the disks 12 and 19 which are then attached to each other using for example a form closing attachment the use of plate disks of a different size also enables providing at least one roll part with a grooving of different depth allowing to optimize the groove depth at the roll edges for example based on the generation of the maximum vacuum output fig2 a shows the effect of closing the open space between the plates and the center shaft of the roll used in the embodiment according.