Failure analysis of a continuous press component in MDF production plant

This work presents the results of a failure analysis performed on a component of a continuous press that is a part of a process plant used to produce MDF (Medium Density Fibreboard) panels. This plant is composed of 2 counter rotating belts that are supported, internally, by small steel rollers, connected to each other by small axes. The failure occurred prematurely on rollers. These components undergo to static and dynamic stresses below the yield strength of material. Low alloyed steel is employed for the production of the rollers and the components are carburized on the external surface. The rollers present cracks on the external surface, that is in contact with the wood panels, already after few hours in service. Other components did not undergo cracking even for very long service times (about 5000h).