Abstract: A screw element includes an outer radius Ra and a core radius Ri for multiscrew extruders with co-rotating and intermeshing screw shafts. The screw element has in axial cross section through its longitudinal axis a profile which has at each of the two axial end faces (i.e. a front end face and a rear end face) only one screw flight corresponding to a conventional single-start screw element for intermeshing screw shafts. In this case, the width (flight land angle ?) of the screw flight and conversely, in a corresponding way, the width (flight land angle ?) of the screw flight are formed in a special way and a shearing flight with a constant shearing flight radius Rs, which is greater than Ri, and less than Ra, is provided.

Abstract: The invention concerns a multiple-extruder configuration in which two co-rotating twin-screw extruders and a counter-rotating twin screw extruder are connected to each other with respect to the flow of material.

Abstract: In a method and apparatus for the continuous production of rubber mixtures, rubber is introduced into a short-screw extruder for subsequent plasticization.

Abstract: The invention relates to a screw element with an outer radius Ra and a core radius Ri for multiscrew extruders with co-rotating and intermeshing screw shafts, in particular for twin-screw extruders, which has in axial cross section through its longitudinal axis (10) a profile which has at each of the two axial end faces (front end face 8, rear end face 8′) only a screw flight (1, 1′) corresponding to a conventional single-start screw element for intermeshing screw shafts. In this case, the width (flight land angle &phgr;) of the screw flight (1) and conversely, in a corresponding way, the width (flight land angle &phgr;) of the screw flight (1′) are formed in a special way and a shearing flight (7) with a constant shearing flight radius Rs, which is greater than Ri and less than Ra, is provided.

Abstract: The invention relates to a screw extruder and gear pump arrangement for highly viscous media, in particular for plastic melts and rubber mixtures, having one or more screw shafts and a gear pump which, in drive terms, is coupled mechanically to the screw shaft or shafts and whose pump casing is a constituent part of the casing of the screw extruder or is connected directly thereto.

Abstract: A process for the continuous solvent-free and mastication-free production of self-adhesive compositions based on polyisobutylene with at least one active pharmaceutical substance in a continuously operating apparatus having a filling section and a compounding section, comprising the following steps: a) feeding an initial batch comprising granulated polyisobutylene, at least one release auxiliary and at least one active pharmaceutical substance into the filling section of the apparatus;  if desired, feeding low molecular mass polyisobutylene, fillers, plasticizers, tackifiers and/or resins, b) transferring the feed components of the self-adhesive composition from the filling section to the compounding section, c) if desired, adding the components of the self-adhesive composition that have not been introduced in the filling section, such as low molecular mass polyisobutylene, fillers, plasticizers, tackifiers and/or resins, to the compounding section, d) if desired, adding further pharmaceutical subst

Abstract: A process for the continuous solvent-free and mastication-free production of self-adhesive compositions based on polyisobutylene with at least one active pharmaceutical substance in a continuously operating apparatus having a filling section and a compounding section, comprising the following steps: