Image formation apparatus and heating method for image formation apparatus

A heating method for an image formation apparatus that includes:

• a sheet feeder that conveys a paper fed from a sheet feed tray;
• a conveyance cylinder that includes a gripper that grips the paper, and receives the paper conveyed on the sheet feeder and conveys the paper to a position of a printing part in a state where the paper is gripped by the gripper;
• and
• a heater that is provided on an upstream side of the conveyance cylinder in a conveyance direction,
• the heating method comprising heating, by the heater, the paper so as to satisfy a temperature condition of following Expression (2):
• |T1−T2|/T1<0.15 Expression (2)
• where T1 is a temperature [° C.] of a paper end of the paper at the position of the printing part, and T2 is a temperature [° C.] of the paper end of the paper when the paper is transferred from the sheet feeder to the conveyance cylinder.