Method and apparatus for injection molding a hollow-wall container

摘要

An injection-molding apparatus for making a hollow-wall container having sides and a base has front and rear mold parts together forming side surfaces of a mold cavity centered on an axis and a floor mold part defining a base surface of the mold cavity. An inner core sleeve and an outer core sleeve are axially displaceable relative to each other and to the mold parts and have front ends. The sleeves together form a passage extending to the front ends and the front ends form a compartment. A sleeve actuator can displace the sleeves axially between a front position with the front ends of the sleeves projecting relatively far into the cavity and a rear position with the front ends of the sleeves generally retracted from the cavity. A piston/cylinder unit formed between the sleeves connected to the passage is pressurizable to shift the sleeves relative to each other and thereby open up the compartment into the cavity. A floor actuator can axially shift the floor between front and rear positions.