This prevents {HEAD ~ the formation} of channels or damage which extend or extends in the axial direction over the entire connection region between can wall and {TAIL ~ separation element} 
This prevents { HEAD ~ the formation } of channels or damage which extend or extends in the axial direction over the entire connection region between can wall and { TAIL ~ separation element }
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL