Abstract: An injection molding machine includes an injection unit with drive units form the movement of the injection unit and for the injection and after-pressure stroke of the plasticizing screw, a tool clamping plate, a mould closing unit with a drive unit form the mould movement and tool closing force and a drive unit for a workpiece ejector device, wherein at least one drive unit is a hydraulic drive unit with a hydraulic pump, a hydraulic cylinder and control valves to activate the hydraulic cylinder, and wherein the hydraulic fluid is an electrorheological fluid and the control valve for the hydraulic cylinder is an electrorheological valve.

Abstract: Injection moulding machine comprising an injection unit with a plasticising screw and drive units for the movement of the injection unit and for the injection and after-pressure stroke of the plasticising screw, a fixed and a moveable tool clamping plate, a mould closing unit with a drive unit for generating the mould closing and opening movement of the moveable tool clamping plate and the tool closing force during injection, and a drive unit for a workpiece ejector device, wherein at least one of the drive units is a hydraulic drive unit with a hydraulic pump, a hydraulic cylinder and one or more control valves to activate the hydraulic cylinder, the hydraulic fluid of the hydraulic drive unit is an electrorheological fluid, and the at least one control valve for the hydraulic cylinder is an electrorheological valve with at least one through-flow gap for the electrorheological fluid and a plate capacitor arrangement for applying an electric control field across the through-flow gap.

Abstract: An injection unit for an injection molding machine includes a screw cylinder, a plasticizing screw which can be driven therein axially and rotatably, the drive unit of which has an electric drive motor, a spindle drive coupled to the screw for the axial movement of the screw, and a rotary drive arranged coaxially with the spindle drive and allowing an axial displacement of the screw for the rotational movement of the screw. A differential gearing, is arranged between the drive motor, on the one hand, and spindle drive and rotary drive, on the other hand, with a differential cage, two driven gears and at least one compensating gear in between.

Abstract: A worm extruder and/or an extruder for processing plastic materials and mixtures of plastic materials includes a worm cylinder and a worm shaft which is drivable for rotation therein, wherein an end region of the worm cylinder comprises an inlet opening for feeding plastic material or mixtures of several plastic materials and/or additives in the form of a bulk material via a feed throat. At least one cooling device is provided in a section of the worm cylinder adjoining the inlet opening. An active heat barrier is provided in the region of the feed throat and includes electrically controllable means for heat dissipation. This increases the efficiency of the cooling process, reduces the operating costs and increases the operational reliability of the worm extruder.

Abstract: An injection unit for an injection moulding machine includes a screw cylinder, a plasticizing screw which can be driven therein axially and rotatably, the drive unit of which has an electric drive motor, a spindle drive coupled to the screw for the axial movement of the screw, and a rotary drive arranged coaxially with the spindle drive and allowing an axial displacement of the screw for the rotational movement of the screw. A differential gearing, is arranged between the drive motor, on the one hand, and spindle drive and rotary drive, on the other hand, with a differential cage, two driven gears and at least one compensating gear in between.

Abstract: An injection molding machine includes an injection molding cylinder with a material supply at one end and an injection nozzle at the other end and a material conveyance unit attached to a drive and movable in the injection molding cylinder. The injection molding machine also includes a vibration element for inducing a flow of melt within the injection molding cylinder for homogenizing the melt.

Abstract: A process for operating an injection molding machine with a stationary die plate on a machine bed and a movable die plate, which die plates are lockable during an injection process by magnetic closing elements, the process including the steps of moving the movable die plate toward the stationary die plate to close a mold, simultaneously moving a structural component part enclosing one of the die plates toward one end to a distance of a few millimeters from the other of the die plates, locking a drive of the movable die plate, activating electromagnets arranged at the structural component part enclosing the one die plate by supplying current, adjusting generation of electromagnetic closing force relative to energy level and duration in dependence on an injection process, and at the end of an injection cycle, moving the movable die plate and the structural component part enclosing the one die plate into an end position in which a free space is formed, so that the free space above the machine bed between the die