What is “Induction aluminum foil sealing machine”?

Induction Aluminum Foil Sealing Machine is used for PP, PE, PET, PS, ABS, HDPE,LDPE and glass bottles, which utilizes electromagnetic principle to produce instant high heat to melt aluminum foil that then adheres to the opening of the bottles, reaching the aim of wet-proof, leakage-proof, mildew-proof and extending preservation time. 

A common type of inner seal is a 2 pieces inner seal which leaves a secondary seal inside the caps once the induction seal has been removed.  This is commonly used where issues of leakage are a concern.  Another option is the single piece inner seal where once the induction seal is removed there is no liner left in the closure.  You can also choose from seals that have a pulltab or ones that have a peelable seal leaving no residue on the bottle. You must be certain that the liner is compatible with the bottle material.