| 摘要 |
A hydrogen generating and palladium catalysed, oxygen absorbing device for food packaging inclusion comprises a first chamber and a second chamber defined by laminar layers C, E that are impermeable to water in the liquid phase but permeable to water vapour and gases. The first chamber contains a fill formulation D, which when activated by water vapour, generates hydrogen, preferably the formulation is a metal hydride. The second chamber contains a substrate carrying a deposit of finely divided palladium F for catalysing reaction between the generated hydrogen and atmospheric oxygen from the container. The laminar layers C, E are preferably a bi-laminar layer formed from a polymer membrane such as polyethylene terephthalate or polyamide supported on high density polyethylene. The device may be provided in the form of a disc, self adhesive label or sachet to allow the establishment and maintenance of an oxygen free atmosphere within the headspace of bottles, cans, sachets or cartons of aqueous liquid foods and beverages. |
