{HEAD ~ A gap} is defined between the counter tool 14 and the sonotrode 20 for {TAIL ~ passage} of the material web 12 
is defined for
{ HEAD ~ A gap } is defined between the counter tool 14 and the sonotrode 20 for { TAIL ~ passage } of the material web 12
HEAD HEAD HEAD HEAD HEAD HEAD REL REL OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH