One-piece blow-molded closed plastic drum with handling ring and method of molding same

摘要

A one-piece blow-molded closed plastic drum (10) having an integrally-formed compression-molded handling ring (20) and method of molding same is provided. The drum (10) has structural strength and stability to resist breakage of the drum upon impact due to tipping or dropping of the drum. The drum (10) includes a generally cylindrical body portion (12) and a head portion (15) integrally-molded with an upper end of the body portion (12) including a transition area (17) around and between the upper end of the body portion (12) and a top (16) of the drum in the head portion (15). The transition area (17) has an outside curved surface (17a) of a predetermined radius (B) so that an outside surface (12a) of the body portion (12) is positioned in a tangential plane (E) in close proximity to a tangential plane (E') along the outer circumferential surface (22a) of the handling ring (20) and/or an inside curved surface (17b) with at least one radius, preferably a double ogee with three predetermined radii (F,G,H), so that no acute angles are formed between inside surfaces at the transition area (17).