This Impulse Bag Sealer is great to address all kinds of packaging needs. With adjustable timer, it creates perfect seals for varying bag thickness. impulse sealing machine Impulse heat sealers use heated sealing wires that are triggered when the sealing bar is pressed close. The sealing bar is often made of a silicone seal pad able to withstand direct heat contact. The sealing bar pushes on the wire and film to melt and mend the material forming a seal.