Method of making multilayer containers

Abstract From the Canadian patent

A thermoplastic container having multilayered sidewalls is compression molded from a multilayer billet having a first and a second thermoplastic layer the layers being so, adapted that when the thermoplastic material of the layers is heated to the heat softened state and a compressive force is imposed thereon, the layers are extruded at differential flow rates into a molding cavity whereby the fastest moving layer forms the flange and exterior surface portions of the container and the slower of the layers forms the interior surface of the multilayer container. A multilayer container having improved gas barrier properties which can be sealed, by double seaming to metal end closures without …