METHOD OF SWAGE-FORMING OF CONTAINER OR PREFORM INTERNAL THREADS AND CONTAINER AND PREFORM HAVING SUCH INTERNAL THREADS

摘要

A method of making a plastic container having a body and an internally threaded finish includes providing a preform of molded plastic construction having a body and an integral neck, and expanding the body of the preform within a mold cavity to form the body of the container. Either prior to or subsequent to blow molding the container body, at least one internal thread is formed in the neck by engaging an inner surface of the neck with a first rotary tool having a peripheral channel, engaging an outer surface of the neck with a second rotary tool having a peripheral bead, and causing rotation of the neck and tools to swage at least one internal thread in the neck.