adapting the second roller to receive {HEAD ~ additive material} on its roll face from the roll face of {TAIL ~ the first roller} 
adapting the second roller to receive { HEAD ~ additive material } on its roll face from the roll face of { TAIL ~ the first roller }
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL