One of those rollers can have a series of pockets in its roll face to receive additive formulation from a reservoir and to define the pattern of {HEAD ~ the formulation} on {TAIL ~ the paper} 
on
One of those rollers can have a series of pockets in its roll face to receive additive formulation from a reservoir and to define the pattern of { HEAD ~ the formulation } on { TAIL ~ the paper }
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 HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL