Apparatus for molding plastic closures

Abstract

Abstract IN A METHOD FOR PRESSURE MOLDING PLASTIC MATERIALS, A STRIP OF DEFORMABLE PLASTIC IS EXTRUDED OVER A MOLD CAVITY. A PREDETERMINED PIECE OF THE EXTRUDATE IS CUT FROM THE STRIP AND FORMED IN THE MOLD UNDER PRESSURE BY MEANS OF A COLLAPSIBLE CORE AND BUSHING ASSEMBLY WHICH FORMS THE PLASTIC AT RELATIVELY LOW PRESSURE IN CONJUNCTION WITH THE FORMING SURFACE OF A MOLD CAVITY. THE COLLAPSIBLE CORE ASSEMBLY INCLUDES A SLIDABLY MOVABLE ACTUATOR AND MATING THREAD-FORMING PORTIONS WHICH ENGAGE SUCH ACTUATOR WHEREBY ADJACENT END PORTIONS OF SAID FORMING PORTIONS ARE FORCED APART AT FIRST END PORTIONS, AND APPROACH EACH OTHER AND ARE READILY RELEASED FROM A MOLDED PIECE AT OPPOSED SECOND END PORTIONS.

Inventors

• 👤 Edward W Owens

Bibliographic Details