Paper machines run continuously at high speed with hot dryer sections and wet forming sections where water vapour and fibres threaten bearings. Selection essentials: sealed deep groove or insert bearings with labyrinth sealing in wet sections; high-temperature grease or circulating oil in dryer sections; grounding brushes or insulated bearings against static electricity; self-aligning bearings for large-span roll deflection. Condition monitoring and planned replacement are vital, since one hour of unscheduled downtime usually costs far more than the bearing itself.