Abstract: An extruder device includes an extruder worm and a worm drive that has a drive motor, which is provided with a rotor. The rotor is connected to the extruder worm during operation in such a way that the rotor and extruder worm rotate at the same speed during operation. The rotor can be connected to detachable torque-transmitting elements which transmit torque between the rotor and the extruder worm and which can be detached when refitting occurs. The detachable torque-transmitting elements include a torque-transmission point at which torque is transmitted from a bushing to a connecting section which is at least partially encompassed by the bushing. The torque-transmission point in an axial direction is located outside the rotor.

Abstract: The invention relates to an extruder device comprising an extruder worm (4) and a worm drive (1,2) comprising a drive motor (1), which is provided with a rotor (8). The rotor (8) is connected to the extruder worm (4) during operation in such a way that the rotor (8) and extruder worm (4) rotate at the same speed during operation. The rotor can be connected to detachable torque-transmitting elements (6, 14, 15) which transmit torque between the rotor (8) and the extruder worm (4) and which can be detached when refitting occurs. The detachable torque-transmitting elements (6, 14, 15) include a torque-transmission point at which torque is transmitted from one bushing (14) to a connecting section which is at least partially encompassed by the bushing (14). The torque-transmission point in an axial direction is located outside the rotor (8).

Abstract: An extruder die head comprises an internal cylindrical mandrel and a shell, which encloses said mandrel concentrically. Between said mandrel and shell an annular channel is formed that empties into the die slit. A polymer melt is fed through a line to the annular channel. To prevent the polymer melt in the area of the start of the annular channel from penetrating into a slit that forms between the mandrel and the shell due to heat expansion, there is between both mandrel and shell a ring with such a coefficient of thermal expansion that when heated up due to the polymer melt said ring seals the slit between the shell and the mandrel.

Abstract: An extruder die head, preferably a blown film head, has an internal cylindrical mandrel and a cylindrical jacket, which envelops concentrically the mandrel. Between the mandrel and jacket an annular channel is formed that empties into a die slit. At least one melt-supplying line empties into the annular channel in the area opposite the die slit. To avoid slits between the central mandrel and the jacket, enveloping the mandrel, where the polymer melt can accumulate and deposit, the mandrel is made as one piece with a flange-like foot and is provided in the area, adjacent to the foot, with at least one borehole, which feeds in the melt. On the mandrel adjacent to the foot is shrunk a ring, which seals the slit between both the mandrel and jacket. The cylindrical jacket is mounted above and connected sealingly to the shrunk-on ring to form the annular channel.

Abstract: An extruder die head, preferably a blown film head, comprises an internal cylindrical mandrel and a jacket, which envelops concentrically said mandrel. Between said mandrel and jacket an annular channel is formed that empties into a die slit. At least one melt-supplying line empties into the annular channel in the area opposite the die slit. To avoid slits between the central mandrel and the jacket, enveloping said mandrel, where the polymer melt can accumulate and deposit, the mandrel is made as one piece with a flange-like foot and is provided in its area, adjacent to the foot, with at least one borehole, which feeds in the melt. On the mandrel adjacent to the foot is shrunk a ring, which seals the slit between both. On the ring is mounted a cylindrical jacket and is connected sealingly to said jacket, which envelops the mandrel, forming an annular channel.

Abstract: A procedure for feeding plastic granulate into the intake opening of a plastic extruder with a storage tank, and with an intermediate storage tank resting on a weighing device.

Abstract: A withdrawal device for a plastic tubular film is manufactured in a blowing method by an extruder. To prevent the formation of center wrinkles in the withdrawal of plastic tubular film, at least one deflection cylinder and/or angle bar has a differing diameter across its length.

Abstract: To determine and/or automatically control the degree of orientation of tubular films which have been made in a film-blowing plant including an extruder having a film-blowing head and apparatus for internal cooling and also including flattening and take-off apparatus, the rate of exchange of the air for internal cooling, the speed of the extruder, the temperature of the plastic composition being extruded and/or the take-off velocity are controlled. To ensure that the degree of orientation can be determined and/or automatically controlled in a simple manner and without an occurrence of trouble, that shape of the flaring portion of the bubble which corresponds to the desired degree of orientation is determined and/or adjusted and is recorded as the desired shape of the bubble. The actual shape of the flaring portion of the bubble is detected and compared with and adapted to the desired shape.