Improving Bearing Reliability in Highly Loaded Paper Machine Rolls, TAPPICon22

Over years, the development of the paper and board machines have led to higher loaded press rolls resulting in higher bearing loads, increased machine speed, and faster machine start-up. Designing the bearing arrangement has become more demanding, especially in the press section for plain press rolls, which are counter rolls for shoe roll. In this application, bearing housing deflection can be substantial due to the load transmitted through the bearing housing to the counter roll.  The housing deflection not only affects the load distribution within the bearing, it also influences the non-locating bearings ability to reposition itself axially in the housing to adjust for thermal growth.  Both conditions, if left unresolved, will result in increased bearing load and increased internal friction ultimately resulting in premature bearing failure.  Reliability of the bearing arrangement can be improved by optimizing the housing design, altering the bearing clearance and changing the non-locating bearing from a spherical roller bearing to CARB (toroidal roller bearing), which allows for frictionless axial movement inside the bearing eliminating the induced internal axial loads from the bearing arrangement. 

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