material of the surface layer 10 has a predetermined good heat conductivity a good heat conductivity can be obtained by various measures for example through interlayering of high heat conductive material with elastic or resilient material the material of the surface layer may be any suitable plastic for example thermosetting plastics acrylic resin or acrylic resin lacquer to improve the heat conductivity of the surface layer metallic fiber metallic powder or other high thermal conductivity additive material may be dispersed throughout the plastic matrix however it is also possible to use a material which has a predetermined good thermal conductivity by itself when the surface layer 10 has good heat conductivity a higher temperature produced inside the roll can penetrate to the surface with low losses in one variation of this embodiment the thermal conductivity of the surface layer 10 is greater than or equal to 10 w m u00b7 k i e no less than 10 w m u00b7 k in a modification of the embodiment as shown in fig1 the second center roll 7 from the top further includes outside of the surface layer 10 a coating 13 made of metal ceramic or plastic the coating 13 since metal ceramic or plastic is used may be made even smoother than the surface of the surface layer 10 and in the preferred embodiment has a lower average roughness ra than an uncoated opposing surface layer 10 on an opposing roll e.