Production of multilayer containers

Abstract From the Canadian patent

A process for making multilayer containers which comprises, the steps of:, a) producing multilayer billets comprising at least one layer of a barrier polymer;, b) producing monolayer sheet of polypropylene; c) heating said monolayer sheet and said billets to a temperature where the mating surfaces of both said sheet and said billets are at or above the fusion temperature of said mating surfaces; d) placing said billets on said sheet, while maintaining said billets and said sheet at or above the mating surface fusion temperature so that said billets and said sheet are welded together; and, e) forming containers from said welded billets and sheet leaving, a web of monolayer polypropylene …