A heat sealer is a device used to seal plastic bags or packaging by applying heat to the material. This process melts the edges of the plastic, allowing them to fuse together, creating an airtight seal. Heat sealers are commonly used in food packaging, medical supplies, and various industrial applications to ensure product freshness and safety. There are different types of heat sealers, including impulse sealers and continuous sealers. Impulse sealers heat up only when the sealing bar is pressed down, while continuous sealers use a constant heat source. Both types are essential tools in industries that require efficient and reliable packaging solutions.