Method of and apparatus for making plastic article

Claim 1

IN A METHOD OF MAKING A BLOWN PLASTIC ARTICLE BY THE INJECTION OF AIR AT A BLOWING PRESSURE INTO A PARISON DISPOSED IN A BLOW MOLD, THE STEPS OF INITIALLY INJECTION MOLDING THE PARISON ABOUT A CENTRAL CORE DISPOSED IN A SURROUNDING INJECTION MOLD, STRIPPING THE CORE AND THE PARISON THEREON FROM THE SURROUNDING INJECTION MOLD TO EXPOSE OUTER PERIPHERAL PORTIONS OF THE PARISON, SLIGHTLY INFLATING THE PARISON (1) FROM CONTACT WITH THE CORE AND (2) TO ENLARGE THE EXPOSED OUTER PERIPHERY OF THE PARISON BY INJECTING A BLOWING MEDIUM INTO THE PARISON AT A PRESSURE SUBSTANTIALLY LESS THAN A BLOWING PRESSURE, AND POSITIONING THE SLIGHTLY INFLATED PARISON IN A BLOW MOLD PRIOR TO THE INJECTION OF A BLOWING MEDIUM AT A BLOWING PRESSURE.