If the sealing machine is an electromagnetic induction aluminum foil sealing machine, the premise of firm sealing is that the bottle cap can press the aluminum foil gasket. Because the electromagnetic induction sealing machine is non-contact sealing, the bottle cap that needs to be tightened needs enough pressure before the aluminum foil gasket can be sealed well. If the bottle mouth is small, the aluminum foil area is small and the heat absorption is slow, it is necessary to increase the output voltage of the sealing machine (increase the magnetic field intensity) and appropriately reduce the speed of the conveyor belt (increase the heating time). If the aluminum foil is very large, which may exceed the sealing range of the sealing machine, the heating sensor can be rotated by an angle (increasing the magnetic field width) to reduce the speed of the conveyor belt.