An apparatus is disclosed for increasing a transfer of thermal energy
through an inner surface of a hollow cylindrical dryer of a papermaking
machine to a peripheral outer surface of the dryer. The apparatus
includes a plurality of bars of rectangular cross-sectional
configuration, each of the bars extending axially within the dryer. The
bars are disposed spaced and parallel relative to each other with each of
the bars being urged outwardly against the inner surface of the dryer. A
mechanism is provided for urging each of the bars radially outward
against the inner surface of the dryer. The mechanism includes a
plurality of hoop rings which are spaced axially within the dryer, each
hoop ring being disposed normal to an axis of rotation of the dryer.