A foam sheet comprising a cellular structure having two or more interconnected cells in fluid communication with one another, the foam sheet being in the form of a tray. One or more perforations are provided in the exterior surface of the tray, and extend into the cellular structure of the foam sheet...http://www.google.com.au/patents/US6279738?utm_source=gb-gplus-sharePatent US6279738 - Foam packaging tray and packaging method using same
