What types of heat sealers are available?

Heat sealers come in many types. There are impulse heat sealers, constant heat sealers, direct heat sealers, automatic heat sealers, hood shrink chambers, hand heat sealers and foot pedal operated heat sealers. All heat sealers fuse layers of thermoplastic materials to form a bag seal to contain the good inside and with food products, keep them airtight and fresh.