Induction Cap Sealing is a non-contact process by which a foil disk or seal is bonded to a container. These are intended to prevent leakage of chemicals from plastic bottle caps. The caps are supplied with an aluminum foil induction innerseal, ready to load into the capper. The container is then filled and capped by the existing process, using the caps that are pre-lined with the induction innerseal. The capped container is then transferred down the conveyor line and passes underneath an induction sealing head at line speeds up to 300 feet per minute. The electromagnetic field generated by the sealing head penetrates the cap and the aluminum foil layer as the container passes underneath. As the field penetrates the foil, it induces an electrical current flow that quickly generates heat, which melts the liner's heat seal film. To prevent liner damage, the sealing head is designed to inductively heat the foil layer of the innerseal structure evenly. After leaving the induction field, the foil cools and the heat seal film bonds to the container, leaving a hermetically sealed container.