A tray sealer that may be incorporated into a packaging facility, the tray sealer may include a tray feeder for collecting a plurality of trays that are conveyed on a continuously moving chain feeder. An embodiment of the tray feeder may comprise at least two train chains. Each train chain may be independently moveable and each train chain may be operable grouping the plurality of the trays into groups and transferring the groups to a sealing station. The group of trays may have number of trays that corresponds to the operation of the sealing station. The tray sealer may include the transfer of a group of trays by a gripper system to a sealing station of the tray sealer.