PRESS ROLL FOR PAPER MACHINE

摘要

Press roll (1) in a paper machine, comprising a metallic cylinder body (2), a ceramic surface layer (3) and an intermediate layer (4) between the cylinder body (2) and the surface layer (3). The intermediate layer is made of a mixture containing metal or a mixture of metals and ceramic components. The mixing ratio of the components of the intermediate layer (4) changes either continuously or in a steplike manner in the radial direction of the roll in such a way that the proportion of metal in the intermediate layer (4) is at greatest close to the cylinder body (2) and decreases therefrom in a radial direction outwards. The purpose of the intermediate layer (4) is that the thermal expansion coefficient changes smoothly from the basic material so that it corresponds to the ceramic surface material.