{HEAD ~ The material web} is guided through a gap between {TAIL ~ the sonotrode} and the counter tool and acted upon by the sonotrode 
{ HEAD ~ The material web } is guided through a gap between { TAIL ~ the sonotrode } and the counter tool and acted upon by the sonotrode
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH