Reel Drum Design

The structure of the wound paper roll is also influenced hy the design of the reel drum. As shown in Fig. 6.78, two kinds of air bubbles may occur at the reel. The boundary layers below the web and on the reel drum are mainly influenced by the 

A possibility to reduce the amount of wound-in air in the parent roll is to use a rubber covered reel drum. This drum can adapt to the uneven surface of the roll to a certain degree and thus close the nip over the whole width. At the same time line force distribution with the mbber covered drum is more even over the whole machine tvidth thus avoiding the high pressure areas that can occur with a steel drum. 

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