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