the same during operation the calender or rolling device of fig1 to 4 can have infed thereto the material m which is to be processed for instancd cocoa powder or paint pigment having a suitable binder in a doughy consistency or form the material m during rotation of the controlled deflection rolls 1 2 3 and 4 moves in the direction of the illustrated components in succession through the pressure gaps or nips x y and z and finally is scraped off by a scraper or doctor blade d or equivalent structure into a container 40 when the rotational speed of coacting rolls is the same then there is produced a simple rolling action if such rotational speed of the coacting rolls is different then the material m can be ground or comminuted between such rolls as a rule the material m between the rolls 1 and 2 is only applied at a central region of such rolls and thereafter progressively spreads out between the rolls 3 and 4 so that the last mentioned rolls 3 and 4 are contacted over a greater part of their lengths by the material by appropriately adjusting the pistons 25 shown in fig3 it is beneficially possible to regulate the pressure force such that it only is effective at the region of the controlled deflection rolls which is contacted by the material m however it should be understood that the region between the pistons 25 also can be adjusted to be the same at.