Abstract:
An extrusion apparatus including at least one conical stator, and at least one conical rotor. The rotor is adapted for defibering or orienting a plastic material. The apparatus has an opening for receiving an elongate product or mandrel. The product or mandrel may be disposed in the apparatus such that, with the product or mandrel received in the opening, an extrusion conduit is defined in the opening between the product or mandrel and the rotor and stator. The rotor and stator are disposed with respect to one another to form a supply opening wherein the plastic material flows between the stator and rotor and is pressed into the extrusion conduit. A method for extrusion is also described involving the apparatus;
Abstract:
A folded dielectric film element is provided which converts energy. The film element includes at least one dielectric film that is bent into folds and provided with electrodes. The electrodes are arranged in the folds so that different electrodes are placed in successive folds. The strength of an electric field increases in one fold and decreases in a successive fold.
Abstract:
The invention concerns an extruder head for regulating the temperature of a flow of molten plastic containing a foaming agent. In the flow passage of the extruder head is arranged a mixer which is inductively heated and transfers heat to the plastic flow thereby regulating the temperature thereof during the passage through the extruder head.