Blow molding method with double cycle for core rods

The method of making blow molded articles by injection molding a parison on a core rod, blow molding the parison to form a hollow article, and stripping the article from the core rod comprising, moving successive parison covered cored rods in a temperature conditioning cycle along a course past an injection molding station, a blowing station and a stripping station, said stations being in a common plane and said temperature conditioning cycle being in a plane other than said common plane, each core rod after injection molding being moved along the course past the blowing and stripping stations and past the station at which the parison was injection molded without interaction with any of these stations, and, then with other core rods indexed for operation at said stations, shifting the position of the temperature conditioned parison covered core rod to said common plane and then moving the temperature conditioned parison covered core rod in another cycle into active cooperation with the blowing station to form said article and stripping station to remove said article from the core rod.