Image forming method, toner and image forming apparatus

摘要

To provide an image forming method including conveying a toner by means of a toner supply device that supplies the toner from inside a toner housing container into a developer housing section of a developing device with the use of a screw pump, and forming an image on a recording medium by developing a latent image on a latent image bearing member to form a toner image with the use of a developer and by transferring the toner image to the recording medium by means of a transfer device, wherein the toner is formed by adding small particle size silica to toner base particles, and wherein when A represents the average degree of circularity of the toner, and B, expressed as percent by mass, represents the amount of the small particle size silica relative to the mass of the toner base particles, the expression −18A+17.92≦B≦−34A+33.96 is satisfied.

主权项

1. An image forming method comprising:
conveying a toner by means of a toner supply device that supplies the toner from inside a toner housing container, which houses the toner, into a developer housing section of a developing device, which houses a developer, using a screw pump, and forming an image on a recording medium by developing a latent image on a latent image bearing member to form a toner image with the use of the developer and by transferring the toner image formed on the latent image bearing member to the recording medium by means of a transfer device, wherein the toner is formed by adding small particle size silica to toner base particles, and wherein when A represents the average degree of circularity of the toner, and B, expressed as percent by mass, represents the amount of the small particle size silica relative to the mass of the toner base particles, Expression (1) shown below is satisfied:
−18A+17.92≦B≦−34A+33.96  Expression (1) for 0.94≦A≦0.99, and the small particle size silica in the toner has a BET specific surface area of 50 m2/g to 400 m2/g.