Abstract: The invention relates to a method and a blank for producing a screw-tube conveyor in the form of a cylindrical rotary tube (110) with an internal screw spiral (120) for conveying and mixing a bulk material. To simplify the method and to create even long screw-tube conveyors with small diameters in an relation to their length, it is proposed according to the invention first to produce a one-piece blank, which comprises a base portion in the basic form of a parallelogram and having laterally mounted fins. In a second method step, the fins are then bent, preferably by 90°, with respect to the base portion. In a third method step, the base portion (112) is then bent along bending lines (115i) in such a way that the base portion forms a helical casing portion (111) of the rotary tube (110) and the previously bent-round fins (122) form segments of the screw spiral (120) arranged inside the rotary tube (110). The invention also relates to a screw-tube conveyor produced in this way.

Abstract: The invention relates to a method and a blank for producing a screw-tube conveyor in the form of a cylindrical rotary tube (110) with an internal screw spiral (120) for conveying and mixing a bulk material. To simplify the method and to create even long screw-tube conveyors with small diameters in relation to their length, it is proposed according to the invention first to produce a one-piece blank, which comprises a base portion in the basic form of a parallelogram and having laterally mounted fins. In a second method step, the fins are then bent, preferably by 90°, with respect to the base portion. In a third method step, the base portion (112) is then bent along bending lines (115i) in such away that the base portion forms a helical casing portion (111) of the rotary tube (110) and the previously bent-round fins (122) form segments of the screw spiral (120) arranged inside the rotary tube (110). The invention also relates to a screw-tube conveyor produced in this way.

Abstract: Device for the thermal treatment of bulk material with a screw conveyor transporting the bulk material which is equipped with infrared heat radiators in a tempering zone, characterized in that the infrared heat radiators are arranged in the screw conveyors in the central area of the rotation diameter. The device is also characterized in that the infrared heat radiators are mounted in a radiation-permeable screw shaft. The walls of a screw trough of the screw conveyor have an infrared-reflecting coating or are made of an infrared-reflecting material.

Abstract: A worm or screw conveyor for the thermal treatment of a bulk containing thermoplastics and which has an elongated housing along which the bulk material is conveyed by a worm or screw. The worm or screw has a certain peripheral diameter and is rotatable about the worm axis to displace the bulk material therealong and an infrared heater is located in the housing centrally of the peripheral diameter for directly exposing bulk material in the housing to infrared radiant energy to heat the bulk material.

Abstract: Thermoplastic articles are removed from a mixed waste stream and are sorted by heating the articles along the path of the waste stream to different softening temperatures of the different types of articles before the articles contact the separating bodies which have surface formations that are forced into the softened zones of the thermoplastic article so that the articles are impaled upon the body. The articles are then removed. The force with which the softened articles are impaled is obtained by a support or counterforce member juxtaposed with the separating bodies.

Abstract: Process and apparatus for the storing of thermoplastic material from a mixed stream which can contain objects of other thermoplastic materials or other objects. The targeted thermoplastic material has a softening temperature which is below that of other materials in the mixed stream which is fed by a transport device through a heating unit which heats the mixed stream to the softening temperature. In the softened rubbery state of the thermoplastic material it tends to adhere to cutter blades which comminute the thermoplastic material preferentially while the remaining materials are rejected by the blades and remain uncomminuted to accomplish the sorting.

Abstract: Refuse containing stretched plastic is collected at each of a plurality of collection locations and is there comminuted and, before or after this comminution, is heated to a relaxation temperature of at least a portion of the stretched plastic thereby embrittling and reducing the volume of this portion. Then batches of the thus comminuted and at least partially embrittled and volume-reduced refuse are transported to a single treatment location. Here the batches of preprocessed refuse are mixed with each other and if desired with unprocessed refuse, and the mixture is sorted and comminuted again.