Method of producing an electrostatic charge image developing...

Details Method of producing an electrostatic charge image developing... Method of producing an electrostatic charge image developing...

2008-01-29

2008-01-29

Le, Hoa Van (Department: 1752)

Radiation imagery chemistry: process, composition, or product th

Electric or magnetic imagery, e.g., xerography,...

Process of making developer composition

C430S137100

Reexamination Certificate

active

07323283

ABSTRACT:
A pulverized starting material is supplied quantitatively from a quantitative feeder1to a first mechanical pulverizer2where the material is pulverized moderately, the resulting moderately pulverized material is supplied quantitatively from a quantitative feeder3to a second mechanical pulverizer4where the material is finely pulverized, and the resulting finely pulverized material is introduced into a coarse-powder classifier5to classify coarse powder not smaller than a predetermined particle diameter. The finely pulverized material from which the coarse powder was removed by classification is further classified fine powder not larger than a predetermined size by a fine-powder classifier7to produce a classified product, while the separated classified coarse powder is introduced into a returning-powder feeder6. The classified coarse powder introduced into the returning-powder feeder6is again supplied quantitatively to the second mechanical pulverizer4, upon which when it is detected that the weight of the coarse powder stored in the returning-powder feeder6is deviated from a predetermined range, the amount of the returning powder supplied to the second mechanical pulverizer4is changed and regulated such that the powder is supplied in the above changed amount. The pulverization conditions in the first and second mechanical pulverizers are established such that the volume-average particle diameter D1 (μm) of the moderately pulverized material obtained by the first mechanical pulverizer2and the volume-average particle diameter D2 (μm) of the finely pulverized material obtained by the second mechanical pulverizer satisfy: 3 μm≦D1−D2 ≦6 μm.

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