Before the single-faced corrugated webs can be bound to the outer paper web they are coated with starch glue in the glue unit. An applicator roll collects glue from the glue pot and a doctor roll distributes it evenly on the roll surface. A thin glue layer is applied to the fluted board peaks at feed through. Even application and good bonding rely highly on the reliability of rolls and their bearings. LUBCON therefore features a series of temperature, media and oxidation-resistant bearing greases, sealing the bearings and protecting them against pollution, friction and wear.