| abstract |
The present invention provides an image forming apparatus that has unfixed toner image forming device for forming unfixed toner images, and fixing device for fixing on a recording material the unfixed toner image formed by the unfixed toner image forming device, wherein the fixing device includes a film, a first back up member and a second back up member which sandwich the film therebetween and are in pressure contact with each other to form a nip portion, and device for increasing a temperature of the film, nips and conveys the recording material bearing the unfixed toner image between the film and the second back up member at the nip portion, and fixes the unfixed toner image on the recording material, wherein toner of the unfixed toner image contains a releasing agent in a binder which contains a coloring material ingredient and have a melt index value of 0.5 g or more and 100 g or less in accordance with a Melt Index measuring method, and wherein an average surface pressure at the nip portion is 5.9×10 4 Pa or more and 24.5×10 4 Pa or less. |