FOR ANVENDNING VID TORKNING AV EXV EN PAPPERSBANA AVSEDD TRUMMA

摘要

A drum comprising an annular grid structure which includes end portions formed only from coils of waved strip material and an intermediate portion formed from alternate coils of waved and planar strip material. The head plates at the ends of the drum have stiffening spokes or ribs connected thereto in a manner accommodating differential expansion and contraction of the head plates and spokes generally radially of the grid structure.