A processing stage may be included which has a pair of {HEAD ~ surfaces} configured to heat and compress {TAIL ~ the tow} therebetween 
A processing stage may be included which has a pair of { HEAD ~ surfaces } configured to heat and compress { TAIL ~ the tow } therebetween
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL REL REL OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH