In a heatable glazing or calendering roll having a cylindrical hollow body with flange necks for each end of the cylindrical hollow body, a displacement body disposed in the cylindrical hollow body and supply and discharge lines for a fluid heat carrier flowing through the annular gap between the displacement...http://www.google.es/patents/US4730374?utm_source=gb-gplus-sharePatente US4730374 - Heatable glazing or calendering roll
