A vertical band sealer is a type of sealing machine used to seal products in pouches made of various materials such as plastic, paper, or foil. It is given this name because it seals the pouch from top to bottom using a continuous band of material. It works by feeding the pouch through a pair of sealing wheels, which heat up and melt the material to form a strong, airtight seal. A vertical band sealer is often used in packaging applications for food, pharmaceuticals, and other products requiring complete protection from external elements.