MULTILAYER CONTAINER AND PREFORM, FORMATION OF PREFORM AND BLOW MOULDING PREFORM TO PRODUCE CONTAINER WITH VARYING THICKNESS

摘要

A multi-layer preform for forming multi-layer containers includes an extruded upper portion having a first thickness which is adapted to form an upper portion of a container. The preform also includes an extruded intermediate portion having a second thickness thicker than the first thickness. The intermediate portion is connected with the upper portion and is adapted to form an intermediate body portion of the container. The preform also includes an extruded base portion having a third thickness thicker than the second thickness. The base portion is connected with the intermediate portion and is adapted form a base portion of the container. The portions of the preform are preferably formed from an inner layer and a barrier layer wherein the layers are co-extruded for forming the preform and an outer injection molded layer. In one embodiment, the inner layer includes a lip which overlaps the top edge of the barrier and outer layers. A multi-layer container is then formable from blow molding the preform.