Abstract: Upstream of a distributor at which flow from an actuator is fed to the shaping orifices for the production of plastic extrusions and downstream of the extruder producing the stream of plastified plastic, a rotary adapter having a displacement body subdividing its cross section into asymmetrical partial cross sections is provided so that, upon deviation of a property of the extrusions from a desired value, the adapter can be rotated to compensate.

Abstract: A method of thermoplastifying a synthetic resin which is displaced by a worm in a worm housing. High-frequency energy is applied to the plastic in one or more regions along the path of the plastic in which there is no or little frictional heat generated by the interaction of the screw with the housing.

Abstract: A coating of at least 71% by weight molybdenum as applied to the steel base body of a worm or screw for a plastifier or extruder for plastic materials and synthetic resin by introducing the coating material into a laser beam and directing the thus melted coating material and the laser beam onto the surface of the worm or screw to be coated. The melt-metallurgical bond is formed between the coating without distortion or crack formation of the base body.

Abstract: The invention relates to a control device for the mechanical or thermal adjustment of the nozzle (1) of an extruder for elongate products (2). In order to eliminate components for wall thickness fluctuations in the longitudinal direction of the elongate product (2) when determining the wall thickness of the elongate product (2) over its width or its periphery, a stationary ultrasonic measuring head (3) is provided in addition to a rotating or reversing ultrasonic measuring head (4). The measured values of the two measuring heads (3, 4) are so linked to one another in an evaluating unit (5) that it is possible to derive therefrom for the controller a correcting variable which leads to an adjustment of the nozzle (1) only if the wall thickness deviations discovered are due to an adjustment error at the nozzle (1).

Abstract: A plastifying extruder of the double-screw type, to avoid dead zones in the flow, has at its throttle location throttle disks on the screws formed with outwardly open recesses angularly equispaced on the disks. Pins distributed around the screws in the throttle region project radially into gaps between the disks and can penetrate to a greater or lesser extent into these gaps to provide a variable flow cross section.

Abstract: An extruder housing is formed for a double-worm or double-screw extruder by providing a steel body with a seamless one-piece structure and hot-isostatically pressing the body and the powder-metallurgical wear-resistant material lining the preferably conical bores of the housing to form a wear-resistant layer which is bonded to the steel body by a diffusion layer.

Abstract: A double worm extruder has the ribs of its screws of trapezoidal cross section between divergent flanks to minimize wear of the housing surface.

Abstract: A double worm extruder for kneading units along the worms which are rotatable in the same sense. Each kneading unit has three or more circumferentially offset polygonal disks which have sealing surfaces at diametrically opposite locations closely juxtaposed with the inner wall of the housing. These sealing disks are flanked by edges which are inclined to the axes of the worms so as to insure greater flow cross sections past the disks and thereby avoid shear peaks in the extruded material and thermal decomposition thereof.

Abstract: A plastifier extruder of the double-screw type has a slide plate shiftable toward and away from the screws at an acute angle to the axes thereof in a chamber having a trapezoidal axial cross section between extreme positions in which a surface of the plate parallel to the axes lies along one long side of the trapezoid and another limiting position in which the surface lies along the other long side of the trapezoid.

Abstract: A hauler for extruded profiles has a pair of track assemblies engaging at least one profile between them. At least one of the profiles is mounted so that it can yaw about a longitudinal axis through the center of that track assembly and a handwheel, electric motor or spring mechanism is provided to effect a yaw of at least 2.degree. and up to 15.degree., preferably up to 4.degree. about this longitudinal axis.

Abstract: A compression-resistant spacer is provided between the lower track of a hauler and the calibrator mounting platform of a calibrator or sizer in a extrusion line to prevent vibration of the calibrator and minimize wall thickness variations and surface markings of extruded profiles such as window profiles.

Abstract: A calibrating unit for an extruder includes an inner calibrating member, and a plurality of outer calibrating members at least partially surrounding the inner calibrating member and forming a gap therebetween through which a plastic material may be extruded, the plurality of outer calibrating members including a base member and at least a first lateral member. The calibrating unit also includes an integrated joint connecting the first lateral member to the base member. The first integrated joint includes a circular cylindrical hinge pin integrally formed along a longitudinal edge of the first lateral member, and a cylindrical circular bearing shell formed in the base member. The circular cylindrical hinge pin is received within the circular cylindrical bearing shell of the base member so that the first lateral member is rotatably interconnected to the base member.

Abstract: The invention relates to a calibrating device for extruded plastics sections, having a number of calibrating units 5 to 7 disposed successively in the drawing-off direction. The calibrating units 5 to 7 are mounted on a guide 1, 2 floatably in the plane normal of the drawing-off direction and disposed on the guide 1, 2, securably in the drawing-off direction. A calibrating device of the kind specified ensures that the precise positioning of the successively disposed calibrating units 5 to 7 is superfluous. Since therefore the section passes the individual calibrating units without lateral deflection or jamming, the individual calibrating unit can be designed with close dimensional tolerances, utilizing the loadability of the section, without introducing an excessive shrinkage into the section.