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.

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.

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.

The present invention relates to a worm shaft for a mixing and kneading machine particularly for continual processing having a shaft bar, on the circumferential surface of which blade elements are arranged to be spaced apart from one another extending outwards from the circumferential surface of the shaft bar, wherein the blade elements are arranged on the circumferential surface of the shaft bar, at least in one section extending in the axial direction of the worm shaft, in two rows extending in the axial direction of the worm shaft.

The present invention relates to a worm shaft for a mixing and kneading machine particularly for continual processing having a shaft bar, on the circumferential surface of which blade elements are arranged to be spaced apart from one another extending outwards from the circumferential surface of the shaft bar, wherein the blade elements are arranged on the circumferential surface of the shaft bar, at least in one section extending in the axial direction of the worm shaft, in two rows extending in the axial direction of the worm shaft.

The present invention relates to a worm shaft for a mixing and kneading machine in particular for continuous preparation processes, comprising a shaft rod, on the circumferential surface of which blade elements are arranged which are spaced apart from one another and which extend outward from the circumferential surface of the shaft rod, wherein the blade elements are arranged on the shaft rod, at least in one section extending in the axial direction of the worm shaft, in three rows extending in the axial direction of the worm shaft, wherein at least one of the blade elements of one of the rows is different from one of the blade elements of one of the other rows, and/or the rows of blade elements, viewed in cross-section of the shaft rod, are distributed irregularly over the circumference defined by the outer circumferential surface of the shaft rod.

The present invention relates to a worm shaft for a mixing and kneading machine in particular for continuous preparation processes, comprising a shaft rod, on the circumferential surface of which blade elements are arranged which are spaced apart from one another and which extend outward from the circumferential surface of the shaft rod, wherein the blade elements are arranged on the shaft rod, at least in one section extending in the axial direction of the worm shaft, in three rows extending in the axial direction of the worm shaft, wherein at least one of the blade elements of one of the rows is different from one of the blade elements of one of the other rows, and/or the rows of blade elements, viewed in cross-section of the shaft rod, are distributed irregularly over the circumference defined by the outer circumferential surface of the shaft rod.

With a mixing and kneading machine (100), wherein a worm shaft (12) moves in a housing (10) in a rotating manner and moves back and forth in a translatory movement, receptacles for kneading elements (12) are distributed non-uniformly. It is thereby possible to equip the receptacles with varying numbers of kneading elements. Quick adaptation is also thereby possible. In one embodiment, the number of kneading elements even varies over the extension direction of the mixing and kneading machine (100).

Extruder (1) for a 3D printer, comprising at least one outer nozzle (2) and a conveying worm (3) for feeding liquid and/or plasticized starting material (4) into the interior chamber (21) of the outer nozzle (2), wherein an inner nozzle (5) is arranged in the interior chamber (21) of the outer nozzle (2), wherein the interior chamber (51) of the inner nozzle (5) is connected to the interior chamber (21) of the outer nozzle (2) via at least one duct (52, 52a, 52b) which is continuous for the starting material (4), and wherein the inner nozzle (5) is mounted such that it can be moved linearly along the longitudinal axis (2a) of the outer nozzle (2). A 3D printer (100) having the extruder (1) and means (8) for generating a relative movement between the extruder (1) and a construction surface (101), on which the object (102) to be manufactured is produced.

An extruder for a 3-dimensional (3D) printer includes a motor having an upright drive shaft, and a print head having a gearbox, a hopper body, and a shroud sequentially coupled in a top-down arrangement with the hopper body positioned adjacent the motor. The print head further includes a nozzle disposed at a bottom portion of the shroud, a barrel in fluid communication with the nozzle and the hopper body, and a screw conveyor moveably supported within the barrel and the hopper body such that the screw conveyor is disposed in rotatable engagement with the upright drive shaft of the motor via gearing arrangement of the gearbox. Upon rotation by the upright drive shaft in a first direction, the screw conveyor is axially retractable in relation to the nozzle for selectively defining a positive displacement pump that controls a flow of feedstock output by the nozzle.