20090123766 | MODIFIED BARRIER LAYERS IN LINERS FOR CONTAINER CLOSURES, CAPABLE OF PROVIDING VARIBLE, CONTROLLED OXYGEN INGRESS - A liner for bottle caps and method for controlling the oxygen diffusion rate of closures. The oxygen barrier layer of a laminated cap liner or seal over cork stopper for a container closure, such as a metal foil or PVDC, is provided with perforations, formed, for example, by laser. Perforations permit an increased oxygen diffusion rate as compared to conventional barrier layers having imperforate metal foil, while permitting the liner or seal to retain a lower oxygen diffusion rate as compared to other conventional liners having no oxygen barrier. The oxygen diffusion rate can be further adjusted by changing the cumulative area of perforations in the metal foil of the barrier laminate, by varying the number of perforations, or by varying the size of the individual perforations. | 05-14-2009 |