Image-forming method in high-speed mode and in low-speed mode

An image-forming method comprising:

• (i) a developing step of developing an electrostatic latent image held on an image-bearing member, by means of a toner to obtain a toner image;
• (ii) a transfer step of transferring the toner image to a recording medium;
• and
• (iii) a fixing step of heating the toner image having been transferred onto the recording medium, to fix the former to the latter, wherein said fixing step is carried out only once;
• and having at least:
• a low-speed mode (PS1) in which images are formed at a low speed, wherein a process speed in said low-speed mode is from 20 mm/sec or more to less than 130 mm/sec;
• and
• a high-speed mode (PS2) in which images are formed at a high speed, wherein a process speed in said high-speed mode is from 130 mm/sec. or more to 600 mm/sec;
• so as to be able to form images at different speeds;
• and
• in said fixing step, the relationship between fixing temperature T1 (° C.) in the low-speed mode and fixing temperature T2 (° C.) in the high-speed mode being:
• T2≦T1−5.

An image-forming method comprising:

• a developing step of developing an electrostatic latent image held on an image-bearing member, by means of a toner to obtain a toner image;
• a transfer step of transferring the toner image to a recording medium;
• and
• a fixing step of heating the toner image having been transferred onto the recording medium, to fix the former to the latter;
• and
• having at least:
• a low-speed mode (PS1) in which images are formed at a low speed;
• and
• a high-speed mode (PS2) in which images are formed at a high speed;
• so as to be able to form images at different speeds;
• said toner being laid on said recording medium in a quantity ranging from 0.05 mg/cm2 or more to 1.3 mg/cm2 or less, where;
• (i) when a recording medium having G0 of 50 (basis weight:
• 148 g/m2) is used and an image is formed under conditions of a process speed of 60 mm/sec. and a fixing temperature of 170° C. and, where the maximum value and minimum value of gloss value of the fixed image obtained are represented by Gmax1 and Gmin1, respectively, the Gmax1 and the Gmin1 satisfy the following expressions:
• Gmax1≦90 and Gmin1≧25;
• and
• (ii) when a recording medium having G0 of 2 (basis weight:
• 81.4 g/m2) is used and an image is formed by fixing performed under conditions of a process speed of 250 mm/sec. and a fixing temperature of 160° C. and, where the maximum value and minimum value of gloss value of the fixed image obtained are represented by Gmax2 and Gmin2, respectively, the Gmax2 and the Gmin2 satisfy the following expressions:
• Gmax2≦22 and Gmin2≧0.