How does an impulse heat sealer work?

An impulse heat sealer works by applying surges in heat to the bag material clamped in its jaws, followed by a cooling period. This cooling period is when the strong seal is formed. Once enough time has elapsed to melt together the seal, the bag can be removed. The sealer then reboots to repeat another sealing action when the clamp is pushed down on the next bag to be sealed.