That is, (1) 2.4???103???d/(TC???t)<T0, where d is a thickness of the unfixed toner layer in meters, TC is a thermal conductivity of toner in W/mK, and t is the fixing time in seconds; (2) a temperature Ttop of a topmost layer of the toner layer is not...http://www.google.es/patents/US7738827?utm_source=gb-gplus-sharePatente US7738827 - Image forming apparatus with toner image fixing unit, and the