Abstract: An extruder for extrusion of material, the extruder comprising a screw (110), a barrel (120), a controller, and a force sensor wherein at least a section (110b) of the screw (110) is conical and wherein at last a section (120b) of the barrel (120) is conical wherein the extruder (100) is adapted for displacing the screw (110) in an axial direction of the screw (110), such that by an axial displacement of the screw with regard to the barrel the size of a leakage gap (180) between the screw (110) and the barrel (120) is modified, wherein the extruder is adapted for actively obtaining operational characteristics and wherein the controller (160) is adapted for controlling the axial displacement of the screw (110) as a function of the operational characteristics of which at least one is an upward force of the material or an upward force on the screw.

Abstract: This disclosure relates to a ball comprising a core and a porous structure encompassing the core. The porous structure comprises a plurality of perforations in its outer surface, which are connected with a plurality of hollow confined spaces within the porous structure allowing a liquid to be at least partly absorbed by the hollow confined spaces upon contact of the ball with the liquid. A shell with shell perforations encompasses the porous structure. The ball comprises control means for controlling the absorption of liquid by the ball and the release of absorbed liquid from the ball.

Abstract: This disclosure relates to a ball comprising a core and a porous structure encompassing the core. The porous structure comprises a plurality of perforations in its outer surface, which are connected with a plurality of hollow confined spaces within the porous structure allowing a liquid to be at least partly absorbed by the hollow confined spaces upon contact of the ball with the liquid. A shell with shell perforations encompasses the porous structure. The ball comprises control means for controlling the absorption of liquid by the ball and the release of absorbed liquid from the ball.

Abstract: An extruder for extrusion of material, the extruder comprising a screw (110), a barrel (120), a controller, and a force sensor wherein at least a section (110b) of the screw (110) is conical and wherein at last a section (120b) of the barrel (120) is conical wherein the extruder (100) is adapted for displacing the screw (110) in an axial direction of the screw (110), such that by an axial displacement of the screw with regard to the barrel the size of a leakage gap (180) between the screw (110) and the barrel (120) is modified, wherein the extruder is adapted for actively obtaining operational characteristics and wherein the controller (160) is adapted for controlling the axial displacement of the screw (110) as a function of the operational characteristics of which at least one is an upward force of the material or an upward force on the screw.