{HEAD ~ The connection} between {TAIL ~ the various parts} is preferably achieved by means of ultrasonic sealing 
between
{ HEAD ~ The connection } between { TAIL ~ the various parts } is preferably achieved by means of ultrasonic sealing
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH