| abstract |
An object of the present invention is to provide a high-precision powder evaluation device for evaluating fluidity of a toner, which has no individual difference and which provides a high quality image. A powder evaluation device according to the present invention rotates a conical rotor into a powder phase compacted by a consolidating means having a piston while rotating, and generates torque when the conical rotor moves through the powder phase. Alternatively, in a device for measuring a load, a means for controlling a consolidation speed at the time of consolidation, that is, a speed between a stage where the piston approaches the powder phase surface and a stage where the piston is pushed into the powder phase, is provided. And By the time the piston of the compacting means collides with the surface of the powder phase, the amount of height displacement changes in two or more stages. [Selection diagram] Fig. 1 |