Ross tray sealers from Reiser produce modified atmosphere packages from preformed trays of almost any size or shape. These sealers package all types of fresh and refrigerated cheese at a full range of output rates in leak-proof, tamper-evident packages with greater seal integrity and extended shelf life. When the tray is in the sealing station, the package evacuation and gas flushing are done using pressure. This ensures the same level of evacuation and gas in each tray on every cycle.