press consisting of three roll presses a press consisting of two roll presses and a subsequent shoe press a press consisting of a shoe press with two subsequent roll presses and a press consisting of two shoe presses in succession for each of these four press devices kpa u00b7 s u00b7 m measurements are calculated for web velocities of 1200 m min 1500 m min and 2500 m min for the first second and third press zones in the press devices medium pressures of p m1 2 mpa p m2 3 mpa and p m3 5 mpa respectively were chosen the lengths of the press zones which were formed by roll presses were l 1 40 mm l 2 30 mm and l 3 30 mm with the subscript denoting the position of that press zone within the press area in relation to the other press zones in this regard a press area is formed by its successive press zones with each press zone defined by the area in which its respective press operates particularly when the presses are press rolls the press area is formed by the successive press rolls for the press devices with shoe presses l 1s 150 mm and l 2s 270 mm were chosen for the lengths of the press zones defined by their respective press shoes corresponding to the subscripts used for the roll presses as discussed above for these shoe presses the position of the press zone within the press area is likewise denoted by a supplementary subscript 1 2 or 3 the four following configurations were thusly obtained the corresponding values for these configurations are shown 1 conventional press press zones l 1 l 2 l 3 for a web velocity of v.