A screw capper is a machine used in the packaging industry to apply screw caps to bottles or containers. Screw cappers typically consists of a conveyor belt that moves the bottles or containers through a series of stations where the screw caps are placed and tightened onto the containers.Screw cappers are widely used in the food and beverage industry,  as well as in pharmaceuticals, cosmetics,  and other industries that require secure and reliable packaging.