When container with an inner aluminum-foil cover passes inductorium, heat will be immediately generated and makes the aluminum-foil layer stick tightly to the bottle mouth to avoid air leakage.

当装有铝箔内盖的容器经过感应圈时，即产生涡流瞬时发热，使铝箔面与瓶口紧密地粘合，达到气密封口的目的。