Method of making multilayer containers

Details Method of making multilayer containers Method of making multilayer containers

B - Operations, Transporting

29

C

18/1074

B29C 51/14 (2006.01) B29C 43/16 (2006.01) B29C 43/20 (2006.01) B29C 43/36 (2006.01) B29C 49/22 (2006.01) B29C 51/02 (2006.01)

Patent

CA 1114124

ABSTRACT OF THE DISCLOSURE A thermoplastic container having multilayered side- walls 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 fracture, is obtained when the faster moving of the billet layers is comprised of a relatively flexible thermoplastic resin material and the slower moving of the layers is formed from a thermo- plastic resin having incorporated therein materials which improve the gas barrier properties of the resin.

319470

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