Abstract: The present invention comprises an extrusion arrangement for the controlled compounding and mixing of a plurality of time, pressure and condition sensitive substances in a single screw plastic extrusion machine, having a main support shaft connected to the downstream end of a single screw plastic extrusion machine, the support shaft enclosed within a barrel shaped housing, at least one stator and one rotor being disposed about the support shaft within the barrel shaped housing, and at least one satellite extrusion feeder arranged to supply an additive to the barrel shaped enclosure through an introduction port, the introduction port arranged at a location radially adjacent a rotor on its support shaft.

Abstract: The present invention comprises a method for delivering a medium such as a gas, vapor or liquid into a melted plastic in a mold via an elongated screw shaft rotatably supported in a housing, the method including the steps of providing the screw shaft with a bore longitudinally therethrough from a proximal end to a distal tip end thereof, rotating the screw shaft in the housing to move plastic therethrough, and into the mold, introducing a gas, vapor or liquid into the bore, to permit the gas, vapor or liquid to be delivered through the bore, and into the molten plastic in the mold through the distal tip end of the screw shaft.