Which type of heat sealer is NOT advisable for use on thin plastic barrier material?

The continuous heat sealer is not advisable for use on thin plastic barrier material because it applies even, continuous heat across the material. This can lead to overheating and melting of thin plastics, which could compromise the integrity of the barrier. Thin materials are more susceptible to damage from prolonged exposure to heat, making a continuous application inappropriate for sealing.

In contrast, other types of sealers, like the impulse heat sealer, deliver heat in a short burst, which can effectively seal thin materials without causing them to melt. The pulsed and handheld sealers also provide more controlled heating methods that are better suited for delicate materials, allowing for secure seals without risking damage to the plastic. Thus, using a continuous heat sealer on thin plastic can result in poor product integrity, making it the least suitable option for this application.