Heat sealers are devices used to seal plastic bags and packaging by applying heat and pressure. They work by melting the edges of the material, creating a strong bond that keeps contents secure and fresh. Heat sealers are commonly used in food packaging, medical supplies, and various industrial applications. There are different types of heat sealers, including impulse sealers, continuous sealers, and vacuum sealers. Each type serves specific needs, such as sealing thicker materials or removing air from packages. These tools are essential for maintaining product quality and extending shelf life.