Tray sealing is a packaging process that binds a flexible, die-cut lid to a pre-formed, rigid tray that contains whatever it is that needs to be packaged. Usually, the lid is made from thin material such as Tyvek, laminated foil, paper, or film, and the tray is made from a rigid or semi-rigid plastic such as PETG.
Tray sealing is commonly used for packaging medical devices, particularly when clamshell packaging or blister sealing are not applicable. Tray sealing prevents products from moving in the tray during shipping and creates a hermetic seal so that products can be stored and shipped under sterile conditions.
Like FFS, tray sealers require product specific tooling to operate correctly and provide a validatable system.