Abstract: An extrusion head for extruding a polymer into a parison for blow molding and including a die ring and a mandrel. The die ring and mandrel each include a frustoconical portion. One frustoconical portion is shaped over its full length to define an ovalized annular outlet. The frustoconical portion is also shaped over less than its full length with a recess that is rotationally offset from the first and generally located upstream therefrom. The shapings result in the prison being extruded in a controlled manner through the outlet orifice with a predetermined area of increased thickness.

Abstract: A method and apparatus for producing a hollow article having a blow molded portion and a compression molded portion. Plastic is extruded over a blow pin assembly to form a parison having an open end and a diameter larger than the diameter of the article's mouth. The blow pin is movable relative to the parison and includes a male mold member on its end. The male mold member has a molding surface corresponding in shape to the compression molded portion of the article. A cutting member is also provided on the blow pin. The cutting member is also movable relative to said parison. Once the parison is enclosed in a hollow mold, the male mold member of the blow pin compresses a portion of the parison between the second portion of the hollow mold and the molding surfaces of the male mold member so as to form the compression molded portion of the article.

Abstract: A blow molded container formed of a polyester resin for use in hot fill applications. The container includes upright side walls, an integral base and a preselected outwardly thermoelastically deformable portion. Upon being filled with a liquid at an elevated temperature, the deformable portion of the container deforms outwardly to partially increase the volumetric size of the container. The remaining portions of the container generally shrink in response to being hot filled.