Automatic machine to apply and weld a cover sheet to a container for syringes or other objects, the machine is suitable to work in clean/sterile environment, especially for RTF (ready to fill glass containers) glass or plastic media solutions. The container containing syringes/flasks is transported through belts to the machine, a robot picks up the cover sheet, places it on top of the container and the machine transports it to the sealing station for sealing, once finished the container is taken out on a special conveyor belt. Optionally the machine can be equipped with paper magazines, inkjet printer, ocr systems and other accessories and controls available on request.