A tray sealer comprises a conveyor arrangement for conveying packaging trays along a conveying direction. The conveyor arrangement comprises a first conveyor device for conveying a first line of packaging trays along the conveying direction, a second conveyor device running laterally alongside the first conveyor device for conveying a second line of packaging trays along the conveying direction, and a center guide which is arranged between the first conveyor device and the second conveyor device and extends along the conveying direction. The conveyor arrangement further comprises a third conveyor device for conveying packaging trays along the conveying direction. The third conveyor device extends adjoining the second conveyor device in terms of the conveying direction laterally alongside the first conveyor device.