PREFORM FOR MAKING PLASTIC CAN BODY AND METHOD OF MANUFACTURING PLASTIC CAN BODY BY USING THE SAME

摘要

A preform is used for making a plastic can body by the biaxial stretch blow molding process. The preform is a cylindrical member having a bottom wall, a side wall, a shoulder and a flange extending outwardly from the shoulder. The flange has a thickness of about one-third of the thickness of the side wall. The shoulder is gradually thinned to form the flange. The flange is not subject to the biaxial stretch blow molding process, maintaining its injected profile, having a mechanical durability and non-gas-permeability due to flow orientation of plastic molding material which is made to flow through a relatively narrow area. The flange is double-seamed with a lid.