Dandy Rolls India recommends:
*Dandy Rolls between 500 and 700 mm Dia for above speed can be run on Trunions without Drive.
*However, on certain specialty papers and light weight papers it is advisable to use a separate drive arrangement for running the Dandy Roll in synchronization with the wire speed.
*Dandy Rolls above 700 mm Dia and up to 1000mm Dia can be run with one end suitable for Central drive and the other end to rest on trunion..
*However the modern Dandy Rolls are fitted with Double side flanges with spherical roller bearings to totally eliminate vibration caused generally by friction of Dandy Roll with Trunion wheels.