a counter tool placed in opposition to {TAIL ~ the sonotrode} to define a gap there between for passage of {HEAD ~ the material web} 
a counter tool placed in opposition to { TAIL ~ the sonotrode } to define a gap there between for passage of { HEAD ~ the material web }
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD