Preform with internal barrier and products made from the same

Abstract From the Canadian patent

This relates to laminated preforms the method, of forming such preforms and products which may be beneficially formed utilizing such preforms. Most particularly this relates to a preform which has formed as part of the injection molding thereof two layers of barrier material which are disposed within two layers of thermoplastic resin and having received therebetween a solid core of thermoplastic resin. The specific method of forming the preform permits the barrier material layers to be of a greatly reduced thickness as compared to such layer thicknesses permissible in the past, with the result that the barrier material layers in the blow molded articles are of a thickness recognized to be …