Patent ID: 7995959

Claim:
A gloss-imparting method comprising: (a) applying heat and pressure to one side of a recording material having an image of toner formed on both sides, and fixing the image to the one side of the recording material; (b) cooling the one side of the recording material on which the image was fixed in the step (a); (c) applying heat and pressure to the other side of the recording material cooled in the step (b), and fixing the image to the other side of the recording material; and (d) cooling the other side of the recording material on which the image was fixed in the step (c), in the step (a), the fixing being performed such that a value of exp(−T·tan δ 0 ) will be approximately 0.85 or less, where tan δ 0 is a loss tangent of the toner when measured by dynamic viscoelastic measurement at a frequency of approximately 1 rad/sec at approximately the same temperature as a fixing temperature of the step (a), and T is a fixing time in the step (a).