Method of forming thermoplastic headed tubular containers

Abstract From the Canadian patent

A method of forming a head on a thermoplastic container wherein a molten disc seals a tubular element and while the disc is still in a moldable state the disc is formed, into a head using either a fluid pressure a vacuum, or both. A, sealing head on an internal sealing mandrel has a first shoulder thereabout which is complementary with a second shoulder about a mold cavity, which trap the periphery of the disc and the head is formed in a configuration conforming to the mold cavity fluid pressure injected through the internal sealing mandrel through a vacuum pulled through the mold form containing the cavity, or by use of both said fluid pressure and said vacuum.