plastic pouch Heat sealing is the process of sealing one thermoplastic to another similar
thermoplastic using heat and pressure. The direct contact method of heat sealing
utilizes a constantly heated die or sealing bar to apply heat to a specific contact
area or path to seal or weld the thermoplastics together. Heat sealing is used for
many applications, including heat seal connectors, thermally activated adhesives,
film media, plastic ports or foil sealing.