Induction foil is a special metal foil material, which is generally made with aluminum foil, and a thin layer of hot melt adhesive coating on the surface. Commonly used in packaging sealing of food, pharmaceuticals, daily chemical and other industries. The induction foil is sealed on the container, and under high-frequency magnetic field action, hot melt adhesive will be heat fluidity to quickly avoid softening between sealing ring components and forming high density adhesion with container mouth. The specific method is that the induction sealing machine can produce a high-frequency magnetic field. When the pressure-sensitive metal foil enters the bearing high-frequency field, the electrons on the conductive foil will produce induced eddy currents. The eddy currents produce heat that heats up and melts the hot melt adhesive. The hot melt adhesive flows fast in the gap of the container mouth and foil, and solidifies to form a strong seal.