초록

A plasticating unit having a channeled rotor rotating in an annular housing for processing plastic or polymeric material. The processed material is fed by a screw to a chamber which expands to receive a predetermined charge of material for injection into a mold.

대표청구항 ▼

Apparatus for injection molding plastic articles including the combination of: a base, a rotary processor for plasticating plastic and polymeric material and mounted on said base for guided reciprocation, said processor comprising a housing having a rotor mounted for rotation in said housing, the ro

Apparatus for injection molding plastic articles including the combination of: a base, a rotary processor for plasticating plastic and polymeric material and mounted on said base for guided reciprocation, said processor comprising a housing having a rotor mounted for rotation in said housing, the rotor having a plurality of annular channels which provide moving surfaces of a plurality of annular passages which passages are closed by a mating surface of the housing, the housing having an inlet through which material to be plasticated is fed to 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 rotatable in a sleeve, an end of said sleeve being secured to and extending from the processor housing into a bore in a barrel, with a first end of the screw communicating with the outlet section of the processor and a second end of the screw communicating with a chamber formed in the bore at an other end of the sleeve; motor means for rotating the rotor and the 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 sleeve and the barrel being fixedly mounted to the processor housing for enlarging the chamber by reciprocation of the processor housing 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; and piston cylinder means acting between the barrel and the processor housing for following retraction of the sleeve during enlargement of the chamber and for driving the sleeve and screw therein axially in a direction opposite said retraction for forcing the plasticated material from the chamber.