in the film press 11 nip n 1 onto the face of the board web w such a liquid amount is absorbed in the board web w into a depth of about 40 to about 45 grams per square meter i e right through the surface or rear layer but however not through the whole board web w which is the case when conventional vat size presses are used in the film size press 10 water alone or starch surface size can be applied to the board web w in which connection the surface sizing of the web w is carried out in the same process in view of the vitrification temperature of the surface layer of the board web w the application of starch can be preferable because the vitrification temperature of starch is lower than the vitrification temperature of cellulosic fibers in the film size press 10 some other chemical besides starch can also be applied to the board web w such as for example a protein or equivalent which has been used earlier for example in the prior art wet stack calenders in the equipment in accordance with the present invention it is also possible to apply a pigment onto the board web w or to apply a coating layer proper in the film size press 10 it has been noticed that an addition of a few grams of pigment before the first calender 20 improves the microsmoothness and the appearance of the surface layer of the board web w as stated above the board web w is not intentionally dried after the film size press 10 and before it enters into.