The drum is in {HEAD ~ the form} of {TAIL ~ a pair} of closely spaced discs having perimetral, cylindrically contoured sealing surfaces for support and, in cooperation with driven metal belts, transport of a web being formed into dunnage units 
The drum is in { HEAD ~ the form } of { TAIL ~ a pair } of closely spaced discs having perimetral , cylindrically contoured sealing surfaces for support and , in cooperation with driven metal belts , transport of a web being formed into dunnage units
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH