A method for reducing fluctuations over time in discharge of a plastics composition when extruding plastics products, including melting plastics material in an extruder and supplying the plastics material to an extrusion die by way of one or more extruder screws arranged in the extruder, and conveying a plastics composition along an extrusion axis by rotating the one or more extruder screws as pressure builds up, wherein discharge of the plastics material at a transition region from the extruder to the extrusion die or in the extrusion die is kept constant by changing a rotational speed of the one or more extruder screws, and wherein changing the rotational speed is carried out within one revolution of the one or more extruder screws.

A tube forming apparatus for forming polymeric tubing includes a housing between rear and discharge ends. The tube forming apparatus includes a core tube assembly with an exterior core tube and an inner core tube positioned partially therein and in an interior area of the housing. The tube forming apparatus includes a die that has an inner die-surface. A diverter tip is mounted in and extends from the inner core tube into the die forming a die opening between the die and the diverter tip. The tube forming apparatus includes a core tube adjustment system mounted proximate the rear end which includes an axial displacement device configured to axially position the core tube assembly for modulating wall thickness of the tube and/or an angular displacement device configured to modulate the inner core tube for modulating concentricity of the tube.

A device manufactures an electrode strip for a battery including a current collector strip and at least one layer of electrochemically active composite material on either side of the current collector strip. The device includes an extruder including a sheath, an extrusion head, and an extrusion screw. The extrusion screw includes an outer tube and an inner tube that are coaxial and fitted into one another. The outer tube is mounted so as to be rotatably movable relative to the sheath. The inner tube is stationary relative to the sheath and includes an outlet located upstream of the extrusion head. Moreover, the manufacturing device includes advancing and unwinding structure to convey the current collector strip through the inner tube and up to the extrusion head.

A sealing device for sealing off the intermediate space between a housing and a shaft which is mounted rotatably in the housing, which housing has a first plate-like body with a front side, a rear side and a first opening extending from the front side to the rear side and suitable for the leadthrough of the shaft, and has a line which runs in the body and which is suitable for conducting a liquid or gaseous medium. Here, the first body is suitable for being fastened sealingly to the housing such that the shaft which is rotatably mounted in the housing is led through the first opening. The line has a multiplicity of outlets which are connected to an inlet via at least one diversion and/or at least one divergence and which lead radially symmetrically into the first opening. The first opening is suitable for the introduction of first sealing such that the first sealing seals off an intermediate space between the shaft and the first body without blocking the outlets of the line.

A reciprocating blow molding unit includes an extruder screw foundation and an extrusion unit coupled to the extruder screw foundation. The extruder screw foundation includes a screw housing formed to include an interior cavity configured to receive polymeric material. The extrusion unit includes an extruder screw arranged to lie at least partially within the interior cavity and is configured to rotate about a longitudinal rotation axis to advance the polymeric material through the interior cavity.

An extrusion apparatus includes a diagnostic system with a material processing section and an extruder screw disposed for rotation in a barrel and surrounded by a shroud assembly. The apparatus includes a temperature control system with heater sand cooler. The apparatus includes a speed control apparatus that has a drive unit and a speed variation device that is coupled to the extruder screw. The apparatus includes a diagnostic system in communication with the material processing section and/or the speed control apparatus. The diagnostic system includes a sensor system in communication with the material processing section and/or the speed control apparatus; and a computer processor in communication with the sensor system and a computer. The computer processor includes a computer readable medium that employs one or more algorithms and that are executable by the computer to generate signals characterizing performance of the material processing section and/or the speed control apparatus.

The invention relates to an extrude unit for a dryer (2) for biomass, in particular slurry, wherein the extruder unit (1) has a surface section (4) for the biomass to pass through and a plurality of apertures (3), wherein the extruder unit (1) comprises a base support (5) which is connected by means of a connecting section (6) to a driving element (7) and can be driven by means of the driving element (7) about an axis of rotation (8) and relative to the surface section (4), wherein the base support (5) comprises at least one support arm (9) having at least one scraper blade (10) which during a rotation of the base support (5) follows the shape of the face of the surface section (4) facing the scraper blade (10). According to the invention the base support (5) also comprises at least one breaker element (11) having at least one scraper blade (10) which during a rotation of the base support (5) also follows the shape of the face of the surface section (4) facing the scraper blade (10) and during the rotation of the base support (5) effects a crushing of constituents contained in the biomass which are retained by the surface section (4). The invention further relates to a dryer having at least one corresponding extruder unit.

An extruder screw includes an extruder shaft and at least one extruder segment. The extruder shaft has a prismatic mandrel having external teeth and a longitudinal mandrel axis. The extruder segment has internal teeth and a longitudinal internal-teeth axis and can be slid onto the mandrel, such that the extruder segment can be connected to the mandrel for rotation therewith. The internal teeth have a profile having a meshing profile and, in an inner area between the first and second end faces of the extruder segment, include a prismatic main profile that has a main cross-section. Furthermore, the internal teeth of the extruder segment have an edge profile adjacent to at least one end face of the extruder segment, which edge profile has a smaller edge cross-section than the main profile at least in the area of the meshing profile.

An extruder, such as a double-screw extruder includes a double cylinder and a double-lead screw arranged therein with a drive train for the screw. The drive train has a coupling with the screw. The extruder includes a sensor for recording a moment load having torque and/or bending moment and for generating electronic data from the recorded moment load. A controller is provided in operative connection to a drive for the drive train and the sensor is in data connection with the controller. The controller is adapted to evaluate the data on the recorded moment load and to trigger a protective action if a threshold value set in the controller is exceeded. The evaluation includes a bending moment calculation. A plastic molding plant produces a film with the extruder along with a nozzle unit and a cooling and wind-up unit or a compounding plant. A method for operating such a plant for manufacturing a film includes the extruder.

An extrusion apparatus includes a diagnostic system with a material processing section and an extruder screw disposed for rotation in a barrel and surrounded by a shroud assembly. The apparatus includes a temperature control system with heater sand cooler. The apparatus includes a speed control apparatus that has a drive unit and a speed variation device that is coupled to the extruder screw. The apparatus includes a diagnostic system in communication with the material processing section and/or the speed control apparatus. The diagnostic system includes a sensor system in communication with the material processing section and/or the speed control apparatus; and a computer processor in communication with the sensor system and a computer. The computer processor includes a computer readable medium that employs one or more algorithms and that are executable by the computer to generate signals characterizing performance of the material processing section and/or the speed control apparatus