Parison and method for forming a container including an internal tapered base

A method for forming a container, the method comprising:

• inserting a core pin into a parison mold configured to form a parison, the parison including:
• a finish defining an opening of the container;
• a parison body configured to be injection blow molded into a container body of the container defining an internal volume of the container;
• a distal end of the parison configured to be injection blow molded into a base of the container including an inner surface of the base defining a lower end of the internal volume, the inner surface slopes downward from a sidewall to a radial center of the base such that the radial center is at a lowermost portion of the inner surface of the base and the inner surface provides a funnel directing contents of the internal volume down to the radial center of the base;
• and
• an annular flange included with the distal end of the parison, the annular flange configured to be injection blow molded into a standing ring of the container;
• injecting high-density polyethylene into the parison mold over the core pin to form the parison;
• removing the core pin with the parison seated thereon out from within the parison mold;
• inserting the core pin with the parison thereon in a container mold configured to form the container;
• injection blow molding the parison into the container mold to form the container from the parison such that the standing ring, the inner surface of the base, the container body, and the finish are monolithic;
• and
• opening the container mold and removing the container from the container mold.