Image forming apparatus and method, and toner, developer and process cartridge for forming image

An image forming apparatus comprising:

• an image forming device to form an image of a toner on a recording material;
• and
• a fixing device including an endless fixing belt to bear the toner image thereon;
• a controller configured to control a speed of the fixing device to feed the recording material from 400 to 1,700 mm/sec while heating the recording material to fix the toner image on the recording material, wherein the fixing belt has at least a substrate, a rubber layer located on the substrate and having a thickness of from 400 μm to 700 μm, and a fluorine-containing resin layer located on the rubber layer and having a thickness of from 2 μm to 20 μm,
• wherein the toner includes:
• toner particles including:
• a release agent including at least one of a microcrystalline wax and a synthetic ester wax;
• and
• a binder resin including a crystalline polyester resin having a long axis diameter of from 0.2 μm to 0.3 μm and an amorphous polyester resin in a surface portion of the toner particles that envelopes the release agent, and
• wherein an amount of the crystalline polyester resin and an amount of the amorphous polyester resin in a surface portion of the toner particles satisfies the following relation:
• 0.045≦W/R≦0.850,
• wherein W represents a height of a third falling peak specific to the crystalline polyester resin in a Fourier transform infrared spectroscopy (FT-IR) spectrum obtained by subjecting the toner to FT-IR using a KBr pellet method, and R represents a height of a maximum rising peak specific to the amorphous polyester resin in the FT-IR spectrum.