Heating roller for a preheating cabinet and its production, preheating cabinet and this comprehensive system

摘要

The invention relates to a heating roller (1) for providing a desired surface temperature for controlling the temperature of a material web (20) rotating around the heating roller, a preheating cabinet (10) with such a heating roller, a system (100) with such a preheating cabinet and a method (200) for the production of such a heating roller, which comprises a circular cylindrical casing tube (2) made of thermally conductive material, preferably metal, and at least one electrical heating mat (3) which is arranged on an inside (21) of the casing tube in contact with the casing tube, with one a thermal insulation layer (4) is arranged on the inside (31) of the heating mat not facing the jacket tube and a spreading device (5) is arranged on an inside (41) of the heat insulation layer inside the jacket tube, which exerts a pre-tension on the heating mat via the heat insulation layer, so that an outer side (32) of the at least one heating mat facing the jacket tube te is pressed permanently against the inside of the jacket pipe.