CONTAINERS HAVING UPPER AND LOWER SECTIONS OF DIFFERENT THICKNESSES AND EXTRUSION BLOW-MOLDING METHODS TO FORM THE SAME

摘要

A plastic container having base and sidewall portions is provided with corrugations as a unitary part of the sidewall portions so as to rigidify the same and thus impart self-supporting capabilities thereto. The sidewall portion is of a thickness that would not be capable of supporting itself without the unitary corrugations. The upper edge of the sidewall preferably includes a unitarily formed rim which assists in maintaining the sidewall in its generally tubular condition (and thus more easily facilitates the placement of articles in the container). The container may be closed by a flexible and gatherable terminal portion which is an integral extension of the rim or the upper edge of the sidewall. The containers of the invention are formed by an extrusion blow-molding technique using an appropriately configured blow mold.