BLOW MOLDS FOR MAKING CONTAINERS HAVING RECESSED BOTTOMS

摘要

An apparatus for blow molding containers having a closed recessed end such as a "champagne" bottle bottom. A parison is first formed in a mold cavity into a blown article of a shape comprising a tubular portion having an outwardly convex closed end. The tubular portion is then cooled while the convex end is heated and then moved into the tubular portion whereupon its curvature is reversed as it becomes a recessed outwardly concave end. The mold may comprise a tubular section, a heated, separately retractable neck section, and an end section which pinches off the parison and is movable into the tubular section after retraction of the neck section for inward movement of the convex end.