Further, if one or both of {HEAD ~ the barrier layers} includes {TAIL ~ a metal foil}, induction heating can be employed to seal the barrier layers together 
Further , if one or both of { HEAD ~ the barrier layers } includes { TAIL ~ a metal foil } , induction heating can be employed to seal the barrier layers together
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH