A coinjection molded multi-layer container includes an inner layer, an outer layer, and a barrier layer. The inner layer includes a first polymeric material and forms an inside surface of the container. The outer layer includes the first polymeric material and forms an outside surface of the container. The barrier layer is located between the inner layer and the outer layer and includes a second polymeric material less permeable to gas than the first polymeric material. The barrier layer is biased toward the inside surface or the outside surface such that the inner layer and the outer layer have different thicknesses.

A controller for an injection molding system is in communication with a melt flow control unit, a gas assist control unit, and a gas counter pressure control unit. The controller can effect real-time adjustments to gas assist pressure and/or gas counter pressure as a function of melt pressure or flow front position.

A mold for high stretching of an in-mold decorative film, comprising an upper base, a stationary mold, a film pressing frame, a movable mold and a lower base sequentially arranged from top to bottom. The film pressing frame can move up and down; a film to be stretched is placed between the film pressing frame and the stationary mold; a cavity block is fixed in the stationary mold, the lower surface of the cavity block is provided with air holes, and the upper surface is provided with a vacuum air pumping cavity communicated with the air holes; a core block is fixed in the movable mold, and a core ejection movable block is arranged in the core block; the core ejection movable block and the movable mold are provided with a heated air inlet channel and an air outlet channel which are communicated with the outside.