Image-forming method having at least two speed modes

摘要

In an image-forming method having a fixing step of fixing a toner image onto a recording medium, and having at least a low-speed mode and a high-speed mode so as to be able to form images at different speeds, either the fixing temperature T1 in the low-speed mode is higher than the fixing temperature T2 in the high-speed mode, or the recording medium has a gloss value as measured by the glossmeter GLOSS HECKER IG-310 of Horiba K.K. by measuring the amount of light reflected under 60 degrees and represented by G0 and the toner is laid on the recording medium in a quantity ranging from 0.05 mg/cm<2> to 1.3 mg/cm<2>, under conditions of which (i) when a recording medium having a high gloss value (G0 > 40) is used, an image is formed at a low-speed mode having a process speed of from 20 mm/sec. to less than 130 mm/sec. and, where the maximum value and minimum value of gloss value of the fixed image are represented by Gmax1 and Gmin1, respectively, they satisfy: Gmax1≤G0 + 40 and Gmin1≥G0 - 25; and (ii) when a recording medium having a low gloss value (0≤G0≤40) is used, an image is formed at a high-speed mode having a process speed of from 130 mm/sec. to 600 mm/sec. and, where the maximum value and minimum value of gloss value of the fixed image are represented by Gmax2 and Gmin2, respectively, they satisfy: Gmax2≤G0 + 20 and Gmin2≥G0 - 15.