A heat sealer is a machine used to seal products, packaging, and other thermoplastic materials using heat.

Impulse heat sealers- use a stationary element which is heated with each sealing cycle .An impulse sealer is a system often found on a "bottom weld" machine. This type of machine uses two sealing elements, an upper and lower which fuse the material from both sides at the same time. The purpose of "Impulse sealing" is to improve the bonding of the two layers of film. This gives a faster and better seal for thicker or hard to seal material.

Hot bar sealers- use one (or two)heated bars which contact the material to form a bond.

Induction sealing is a non-contact type of sealing used in bottle caps

Ultrasonic welding uses high-frequency ultrasonic acoustic vibrations to workpieces being held together under pressure to create a weld.

A type of heat sealer is also used to piece together plastic side panels for light-weight agricultural buildings such as greenhouses and sheds. This version is guided along the floor by four wheels.