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