and the second roll 3 form a nip n between them the paper or board web w being passed through the nip in the film size press 1 a first size film f1 is metered onto the face 4 of the first roll 2 by means of a first coating device 10 and in a corresponding way a second size film f2 is metered onto the face 5 of the second roll 3 by means of a second coating device 20 in the roll nip n the size films f1 and f2 are transferred onto the paper or board web w running through the nip in fig1 the coated web is denoted with the reference w 39 in the film size press 1 shown in fig1 the coating devices 10 and 20 by whose means the size films f1 and f2 are spread onto the faces 4 and 5 of the rolls 2 and 3 in the size press are bar coaters which are equal in size to one another as is shown in fig1 the coating devices 10 and 20 are of the so called short dwell type in which the coating agent is introduced into a pressurized coating agent chamber 16 26 placed before the coating bar 11 21 besides being defined by the coating bar 11 21 the chamber is also defined by the roll face 4 5 the front wall 14 24 of the coating agent chamber as well as by possible lateral seals if any not shown the coating bar 11 21 is fitted.