a container formed of paperboard , or the like , is formed with an aperture . a plastic disk is attached to the paperboard over the aperture by thermoplastic welding or other means . the disk has a frangible area which is opened to dispense contents . typically the frangible area is penetrated by the end of a drinking straw . for aseptic packaging , the paperboard may be lined with a barrier , such as foil . alternatively foil may be attached to the disk and welded to the paperboard surrounding the aperture or welded to a foil or polyethylene liner for the paperboard .