Abstract: Methods are disclosed for injection molding a partitioned container having four sidewalls, an open top and a closed bottom. Thermoplastic material from a primary sprue flows through a runner system to inlet gates disposed to open into the mold cavity in a generally common plane lying at about the open top of the container to be molded and along opposed container sidewalls intermediate adjacent partition walls. Two mold structures for, inter alia, facilitating the gating method are disclosed. A preferred mold comprises four block members defining, in a closed position, a hollow cavity corresponding to the exterior container dimensions but moveable outwardly to an open position. A plurality of spaced core members are moveable into and out of the hollow cavity to, respectively, define the container mold and permit ejection of the molded container therefrom. Other method features are disclosed.

Abstract: Apparatus is disclosed for injection molding a partitioned container having four sidewalls, an open top and a closed bottom. Thermoplastic material from a primary sprue flows through a runner system to inlet gates disposed to open into the mold cavity in a generally common plane lying at about the open top of the container to be molded and along opposed container sidewalls intermediate adjacent partition walls. Two mold structures are disclosed. A preferred mold comprises four block members defining, in a closed position, a hollow cavity corresponding to the exterior container dimensions but movable outwardly to an open position. A plurality of spaced core members are movable into and out of the hollow cavity to, respectively, define the container mold and permit ejection of the molded container therefrom. Other apparatus features are disclosed.

Abstract: An injection mold is disclosed for making an article having a plurality of side walls defining an enclosure. The mold elements during opening and closing of the mold move in a coordinated manner via mechanical interlocks. A first mold section carries plural side wall members that slide between a closed position and an open position. A second mold section interlocks with the side wall members to carry them from their closed to their open position and the side wall members are themselves linked to a stripper ring that strips the article from the mold. Other features are disclosed.