Patent ID: 6918195

Claim:
Drum device, preferably, a screening drum, for the flow-through heat treatment of web-type textile material, nonwoven material, or paper, including a treatment agent, such as a gaseous treatment agent, circulating In the device, and including a sheet-metal drum which is internally under suction, has bases at the end faces and is perforated, for example, for permeability, and functions as the transport element for the web-type material, the circumference of which drum is covered by a permeable, tube-like screen fabric, the at least one circular front edge of which is elastically supported by a tension ring of the outer diameter of the drum and arranged concentrically, said ring being located at the associated front wall of the drum so as to continuously compensate for any changes in length of the screen fabric alternately arising from temperature fluctuations during the heat treatment, characterized in that the tension ring ( 13 ) is held radially at the level of the outer diameter of the drum ( 1 ) and concentrically relative to the outer diameter by radially oriented but axially effective spring elements ( 11 ).