Abstract: A system for delivering elastomeric media comprises a gear pump and a screw-type extruder which, viewed in the delivery direction of the pumping medium, is arranged in front of the gear pump and which comprises a screw and a screw casing. The screw casing has at least one conical part, and the screw has at least one tapering in the area of the conical part. For the controlled feeding of energy into the pumping medium, the screw is axially displaceable in the screw casing.

Abstract: The invention relates to a system for delivering elastomeric media, the system consisting of a gear pump (1) and a screw-type extruder (10) which, viewed in the delivery direction (6) of the pumping medium, is arranged in front of the gear pump (1) and which consists of a screw (11) and of a screw casing (12).

Abstract: The invention relates to a system for delivering elastomeric media, the system consisting of a gear pump (1), a filter (20) and a screw-type extruder (10) which, viewed in the delivery direction (6) of the pumping medium, is arranged in front of the gear pump (1) and which consists of a screw (11) and of a screw casing (12).

Abstract: The mass which is made flowable (rendered plastic) must be degassed on its way to the outlet. In order to make the degassing section free of pressure a diaphragm, through which the mass flows, is provided further upstream. The extruding helix is provided with at least one helical flute, the free flow passage of which is blocked, and the diaphragm is provided with an adjustable throughput area. The diaphragm can simply consist of two perforated disks, which are rotatable with respect to each other around their axes. Each perforated disk has a fixed throughput area. The holes of both perforated disks overlap more or less, or not at all. The throughput rate of the mass through the extruding device can therefore, according to the state or the kind of mass, be regulated independently of the rotation speed of the extruding helix. Different masses can be extruded with one and the same helix, in a way hitherto not possible. One can also use an extruding helix which is shorter than was hitherto possible.

Abstract: Apparatus (10) for manufacturing polymeric tubing (T) containing a reinforcing material (M) enclosed between first and second polymeric compounds including an extrusion head (11) having an elongate housing (14), a bore extending from a front end (15) of the housing to a rear end (16) of the housing, a rear material guide sleeve (50) fixed in the bore proximate the rear end of the housing and having a channel (51) for passing reinforcing material, a forward material guide sleeve (36) fixed in the bore proximate the front end of the housing for radially outwardly constraining passing reinforcing material, a center pin (76) extending substantially the length of the housing and located centrally of the bore thereof, a flow pipe (60) extending from the rear material guide sleeve and forming an inner channel (90) supplying a first polymeric compound, means for adjusting the concentricity of the flow pipe relative to said center pin means, an outer channel (45) supplying a second polymeric compound, and adjustable d