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