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