Rotary plasticator screw injection machine

Apparatus for injection molding plastic articles said apparatus comprising a base, a rotary processor for plasticating plastic and polymeric material comprising a rotor mounted for rotation in a housing, the rotor having a plurality of annular channels which provide moving surfaces of a plurality of annular passages which are closed by a mating surface of the housing, the housing having an inlet through which material to be plasticated is fed into at least one of the passages, and fixed members projecting from the housing into the channels for restraining the material to be acted on by the moving surfaces and to direct the material to successive passages and toward an outlet section of the housing, an elongate screw connected to the rotor and rotatable in a sleeve, said sleeve having a hollow interior and being secured to and extending from the processor housing into a bore in a barrel, a first end of the screw communicating with the outlet section of the processor and a second end of the screw and an end of the sleeve extending into the bore to form a channel between an end of the bore and the end of the screw second and said end of the sleeve, motor means for rotating the rotor and screw in unison for plasticating and otherwise operating on the material fed through the inlet and successive passageways, through the outlet section and along the screw into the chamber, the barrel being mounted to the processor housing for enlarging the chamber by reciprocation of the processor housing carrying the screw and sleeve relative to the base to accommodate plasticated material fed by the screw and for reducing the volume of the chamber for forcing the plasticated material therefrom, piston cylinder means acting between the barrel and the processor housing for following retraction of screw and sleeve during enlargement of the chamber and for driving the screw and sleeve therein axially in a direction opposite said retraction for forcing the plasticated material from the chamber, and valve means disposed in the barrel adjacent said other end of the screw and sleeve combination and connected thereto, the valve means being movable from an open position allowing flow of material from within the sleeve into the chamber to a closed position sealing the sleeve from the chamber in response to movement of the screw and sleeve toward an end of the bore opposite the rotor.