6 b with a counter roll not shown the endless belt 6 moves from right to left in fig1 the heel 9 is therefore arranged at the downstream end of the shoe element 2 the shoe unit 2 is according to the illustrated embodiment symmetrically formed in each edge region of the pressing surface 21 in the upstream end of the shoe element 2 there is a marked end region z 1 z 2 which is a region with a convex curved surface 21 a as can be seen from the figure the lengthwise extent l of the upstream edge region 21 a is considerably shorter than the concave part 21 of the pressing surface within the upstream edge region 21 a there is a transversely extending line x at which contact is first made between the belt 6 and the pressing surface 21 of the shoe unit at the upstream end of the shoe element is a distribution chamber 7 which in a known manner supplies the pressing surface 21 with oil via ducts not shown at said distribution chamber there is an oil evacuation arrangement 4 which comprises a guide plate or partition 42 a container part 45 44 46 43 a 43 b an evacuation duct 8 and an inlet opening 41 the container part consists of a first longitudinal wall element 45 a plane bottom portion 44 a second longitudinal wall element 46 and two end walls 43 a 43 b the upstream longitudinal wall 46 is divided into a lower section 46 a and an upper section 46 b the lower wall section 46 a is arranged at an.