Extrusion device for mixing and dispensing highly viscous, reactive multiphase mixtures, wherein the extrusion device comprises: a multi-shaft extruder; and a controllable die; wherein the multi-shaft extruder comprises: - a housing, - at least one inlet in said housing, through which material to be extruded can be fed, - an outlet in the housing, through which extruded material can be discharged, - at least two screw shafts which are both accommodated in the housing so as to be rotatable and interlocking in a tightly meshing manner, - a drive for rotatably driving the screw shafts; wherein the die comprises: - a housing, - at least one infeed in the housing which is connected to the outlet of the multi-shaft extruder in fluid communication and through which extruded material can be fed, - a discharge point in the housing, through which extruded material can be discharged, - a channel between the infeed and the discharge point, - at least one actuating element which, by displacement of the actuating element to different positions in the channel, regulates a flow resistance between the infeed and the discharge point, characterised in that the actuating element and the channel are structurally adapted to one another and the actuating element is displaceable relative to the channel such that the actuating element is displaceable between a closed position, in which the actuating element completely closes the channel, and an open position, in which the actuating element opens the channel to a maximum extent, and in that the die is configured to clean in a self-acting manner the channel at least in a partial region between the infeed and the discharge point during the operation of the extrusion device with the aid of the actuating element, wherein the channel and the actuating element have, at least in regions, a substantially complementary cross-section such that an outer circumference of the actuating element is in mechanical contact with an inner wall surrounding the channel such that, by reason of this mechanical contact, the actuating element, when being displaced along the channel, entrains any deposits on the inner wall or presses said deposits out of the discharge point of the die. a multi-shaft extruder; and a controllable die; wherein the multi-shaft extruder comprises: - a housing, - at least one inlet in said housing, through which material to be extruded can be fed, - an outlet in the housing, through which extruded material can be discharged, - at least two screw shafts which are both accommodated in the housing so as to be rotatable and interlocking in a tightly meshing manner, - a drive for rotatably driving the screw shafts; - a housing, - at least one inlet in said housing, through which material to be extruded can be fed, - an outlet in the housing, through which extruded material can be discharged, - at least two screw shafts which are both accommodated in the housing so as to be rotatable and interlocking in a tightly meshing manner, - a drive for rotatably driving the screw shafts; wherein the die comprises: - a housing, - at least one infeed in the housing which is connected to the outlet of the multi-shaft extruder in fluid communication and through which extruded material can be fed, - a discharge point in the housing, through which extruded material can be discharged, - a channel between the infeed and the discharge point, - at least one actuating element which, by displacement of the actuating element to different positions in the channel, regulates a flow resistance between the infeed and the discharge point, - a housing, - at least one infeed in the housing which is connected to the outlet of the multi-shaft extruder in fluid communication and through which extruded material can be fed, - a discharge point in the housing, through which extruded material can be discharged, - a channel between the infeed and the discharge point, - at least one actuating element which, by displacement of the actuating element to different positions in the channel, regulates a flow resistance between the infeed and the discharge point, characterised in that the actuating element and the channel are structurally adapted to one another and the actuating element is displaceable relative to the channel such that the actuating element is displaceable between a closed position, in which the actuating element completely closes the channel, and an open position, in which the actuating element opens the channel to a maximum extent, and in that the die is configured to clean in a self-acting manner the channel at least in a partial region between the infeed and the discharge point during the operation of the extrusion device with the aid of the actuating element, wherein the channel and the actuating element have, at least in regions, a substantially complementary cross-section such that an outer circumference of the actuating element is in mechanical contact with an inner wall surrounding the channel such that, by reason of this mechanical contact, the actuating element, when being displaced along the channel, entrains any deposits on the inner wall or presses said deposits out of the discharge point of the die.