Sealing machines are devices used to securely close packages, containers, or products to protect their contents from contamination, spoilage, or tampering. They come in various types, including heat sealers, vacuum sealers, and pressure sealers, each designed for specific materials and applications. These machines are commonly used in industries such as food packaging, pharmaceuticals, and electronics. The operation of sealing machines often involves applying heat, pressure, or a combination of both to create a strong seal. Heat sealers use heat to melt and bond materials, while vacuum sealers remove air from the package before sealing. Proper sealing ensures product safety and extends shelf life.