It is proposed a process for fastening an accessory to the interior of a blow-molded tank, the tank having a plastic wall produced from a parison, the accessory comprising a body having at least one attaching portion projecting radially from the body. The process comprises the steps of: a) introducing the accessory and the parison in a molten state into a mold so that the accessory is surrounded by the parison, the mold comprising cavities, at least one cavity being equipped with at least one movable insert configured to fold locally some of the molten parison on the attaching portion; b) contacting the parison with the attaching portion; c) moving forward the insert and folding locally some of the molten parison on the attaching portion; d) closing the mold by moving the mold cavities to a final closing position and inflating the parison to form the blow-molded tank; e) moving backwards the insert; and f) opening the mold.

A container including an opening defined by a finish portion, and a base at an end of the container opposite to the opening. The base includes a standing ring extending inward from a heal to a center pushup portion. The center pushup portion includes an pushup ring surrounding an inversion portion. In an as-blown position the inversion portion extends outward and beyond the pushup ring such that the inversion portion is further from the opening than the pushup ring. In a final position the inversion portion is inverted relative to the as-blown position such that the inversion portion extends inward so as to be closer to the opening than the pushup ring. The inversion portion is mechanically moved from the as-blown position to the filled position with an inversion device after the container has been filled to reduce vacuum or increase pressure within the container.

Methods and apparatuses for blow molding a fuel tank with multiple concentric needles to form an opening in the fuel tank, and/or for calibrating the opening in the fuel tank as it cools.

A blow molding machine assembly configured to be mounted to a blow molding machine to move a mold base configured to form a container base. The blow molding machine assembly includes an over-stroke cylinder and a counter-stretch rod. The over-stroke cylinder is configured to move the mold base between an extended base position and a retracted base position. The counter-stretch rod is movable between a retracted rod position in which the counter-stretch rod does not extend out from within the mold base, and an extended rod position in which the counter-stretch rod extends out from within the mold base.

The present invention relates to a process for making a container having an integral handle, comprising the steps of: a) providing a preform (1) in a mould cavity (2); b) stretch-blow moulding the preform (1) to form an intermediate container (3); c) applying one or more inwardly moving plugs (5) to form one or more concave gripping region(s), whilst maintaining the pressure within the intermediate container (3) above 1 bar and whilst the temperature of the material in the gripping region of the intermediate container is at a temperature below the glass transition temperature, T.sub.g; d) releasing excess pressure within the container, preferably prior to withdrawing the plug (5) from within the container; and e) ejecting the finished container(6) from the mould cavity (2,4).

Blow molding tools and a method of blow molding which provide that the tool have a retractable push up section in the base which allows for the article molded by the tool to have a recessed base internal to an otherwise hollow structure. As the push up is moveable, adjustment of the push up portion can be performed during an automated blow molding operation so as to allow release of the blow molded article.

A plastic container having a sidewall defining a chamber and having a first end and a second end and an opening at the first end into the chamber. A base of the container extends from the sidewall and closes the second end, the base having an outer perimeter portion defining a support structure, an axially inwardly extending perimeter wall spaced radially inwardly from the support structure forming an angle with a horizontal line of greater than about 80, a centrally disposed pushup section in the shape of an axially inwardly extending truncated cone, and a toroidal-shaped channel circumscribing and connecting the perimeter wall to the pushup section. The toroidal-shaped channel has a surface that is asymmetrical about a central axis of the container when the container is under static pressure conditions.