Cup Sealer Manual Cup Sealer Machine is a small and easy-to-use device used for sealing cups with a plastic film. It works manually by using a handle to press and seal the film over the cup. To use it, place the film roll in the bobbin, set the film properly, adjust the temperature and sealing time, fill the cup, and place it in the sealing area. Press the handle downward to seal the cup. This machine is commonly used in juice shops, cafes, and small food businesses for leak-proof cup sealing.