Abstract: A flow-rearrangement device between the annular extrusion gap of an extrusion head and the feed for the thermoplastified synthetic resin has two disks with registering grooves forming rearrangement ducts communicating axial inlet bores with axial outlet bores to effect a flow rearrangement of the thermoplastified synthetic resin which produces microtexturing of the finished product. The extrusion head may be a film or foil blowing head.

Abstract: A rotor and stator mixing system has mixing-chamber recesses in the outer periphery of the rotor and inner periphery of the stator which are generally similar, arrayed in peripheral and axial rows and are mutually axially offset. The guide radius R of the semicircular ends of each elongated recess is also the trough radius thereof and the trough depth is less than this guide radius. The length L of the mixing chambers is three to four times the guide radius, the web width between the recesses of each circumferential row is less than half the guide radius and the shear gap width W is so selected that the shear velocity which is realized is sufficient for effective mixing by a shear action.

Abstract: An extruder feeds a thermoplastified flow of synthetic resin to at least one mixing unit which is driven independently of the extruder and has a rotor and stator with mutually facing pockets and defining a gap between them traversed by the thermoplastified flow and into which an additive is pumped at an upstream end so as to obtain an especially homogenius distribution of the additive in the thermoplastified flow.

Abstract: A method of mixing a pumpable additive with a thermoplastified flow utilizes a pocketed rotor and stator structure integrated in a worm or screw plastifier and to which the additive is fed by a metering pump at the upstream end of the gap between the rotor and stator surfaces.

Abstract: A synthetic resin worm press in which the thread height in an intake zone adjoining a feed opening zone is substantially smaller than the thread height in the feed opening zone, a frustoconical divergent transition piece is provided between the two zones at the core of the worm and longitudinal grooves are formed in the wall of the bore along these zones and are of progressively decreasing depth in the flow direction of the material.