Abstract: An apparatus for producing toner for developing an electrostatic latent image, is provided with an inlet section to receive a slurry containing toner particles, impure fine particles having a specific gravity smaller than that of the toner particles and aqueous medium; a centrifugal concentrating device for applying centrifugal force to the slurry and having a precipitating plate with which the toner particles are precipitated from the slurry and an accommodating section to accommodate a concentrated slurry containing the precipitated toner particles, and an outlet section to deliver impure fine particles and aqueous medium.

Abstract: Magnetic recording media are smoothed with a tape. Each magnetic recording medium has a magnetic film and a lubricant film thereon. Next, the smoothed magnetic recording media are taken out from a process case and put in a shipping case. The magnetic recording media are then taken out from the shipping case and tested. Non-defective ones of the magnetic recording media are put in the shipping case.

Abstract: Disclosed is a production method of an electrophotographic toner, which comprises toner particles comprising a resin and a colorant. The method comprises a step of forming toner particles in an aqueous medium, and processing an aqueous medium containing the toner particles or a component of the toner particles by gas bubbles.

Abstract: An apparatus for producing toner for developing an electrostatic latent image, is provided with an inlet section to receive a slurry containing toner particles, impure fine particles having a specific gravity smaller than that of the toner particles and aqueous medium; a centrifugal concentrating device for applying centrifugal force to the slurry and having a precipitating plate with which the toner particles are precipitated from the slurry and an accommodating section to accommodate a concentrated slurry containing the precipitated toner particles, and

Abstract: A toner for developing an electrostatic latent image is disclosed. The toner comprises a resin, a colorant and a releasing agent or a crystalline polyester compound, and the toner has crushability index from 0.1 to 0.8.

Abstract: A production method of electrostatic latent image developing toner, comprising: a colored particle forming step of forming colored particles in water-based medium; a first separation step of separating the colored particles from the water-based medium; a dispersing step of dispersing the colored particles into a washing medium; a skimming step of skimming impurities other than the colored particles together with at least a part of the washing medium, the impurities drifting on the washing medium; and a drying step of dry the colored particle so as to make the water content of the colored particles being 3% or less.

Abstract: A coating method of coating an outer circumferential surface of a cylindrical base with a coater having a supply port, a coating solution chamber, and a slit communicating with the coating solution chamber, the slit being provided around an inner circumferential surface of the coater, comprisse steps of: feeding a coating solution from the supply port to the coating solution chamber so that the coating solution is discharged to the slit; adjusting an absolute pressure P in the coating solution chamber so as to satisfy the following formula: 3×104≦P≦3×106 (mmH2O) and relatively moving the cylindrical base through a hole formed by the inner circumferential surface of the coater so that an outer circumferential surface of the cylindrical base is uniformely coated with the coating solution flowing out from the slit.

Abstract: A toner for developing an electrostatic latent image is disclosed. The toner comprises a resin, a colorant and a releasing agent or a crystalline polyester compound, and the toner has crushability index from 0.1 to 0.8.

Abstract: A coating method of coating an outer circumferential surface of a cylindrical base with a coater having a supply port, a coating solution chamber, and a slit communicating with the coating solution chamber, the slit being provided around an inner circumferential surface of the coater, comprisse steps of: feeding a coating solution from the supply port to the coating solution chamber so that the coating solution is discharged to the slit; adjusting an absolute pressure P in the coating solution chamber so as to satisfy the following formula: 3×104≦P≦3×106 (mmH2O) and relatively moving the cylindrical base through a hole formed by the inner circumferential surface of the coater so that an outer circumferential surface of the cylindrical base is uniformely coated with the coating solution flowing out from the slit.

Abstract: An apparatus for coating a cylinder with a solution. The apparatus has a coater which includes a body having a circular hole through which the cylinder passes. A coating surface is provided on a wall of the circular hole so as to surround an outer surface of the cylinder as the cylinder passes through the circular hole. A solution chamber is provided in the body for storing the solution, and a slit is provided in the body for distributing the solution from the solution chamber to the coating surface. A feeding port is provided on a periphery of the body, and a feeding conduit is provided in the body for connecting the feeding port and the solution chamber so that the solution is fed from the feeding port to the solution chamber. The solution chamber has a height H2 of 5 mm to 50 mm, the slit has a slit gap distance HI, and a ratio H2/H1 is 10 to 1000.

Abstract: In a method of coating outer surfaces of plural cylinders by a coater having a circular hole on which a coating surface is provided, gas is blown onto the outer surface of the cylinder by a cylindrical blowing device so that the cylinder is positioned coaxially with the circular hole. The gas amount is changed when the cylindrical blowing device blows gas onto a joint portion at which a bottom edge of an upper cylinder contacts with a top edge of a lower cylinder.

Abstract: A method of manufacturing an electrophotographic receptor drum, has the following steps. Cylinder shafts of a plurality of cylindrical drums are aligned with each other; and circular ends of the drums are contacted with each other and the drums are stacked on each other. Photoreceptor material is continuously coated on circumferential surfaces of the drums while the drums are inserted into a ring-shaped coater and the ring-shaped coater is moved vertically from an upper portion to a lower portion of the stacked drums. Each of the drums satisfying the following inequalities at the same time is used for the coating:30.degree..ltoreq..theta..ltoreq.80.degree., and 0.01 mm.ltoreq.l.ltoreq.0.3 mmwhere .theta.

Abstract: A method for cutting a surface of a base of a photoreceptor for electrophotography is disclosed. The method comprises steps of:(a) supplying an aqueous cutting fluid to the surface of the photoreceptor base;(b) cutting the surface of the photoreceptor base by a cutting tool comprising a single crystal diamond.

Abstract: In a method of manufacturing a photoreceptor drum which has been coated and then quick dried, the drum having a plurality of vertically-stacked base drums that are coated and dried from the uppermost base drum toward a lowermost base drum. The uppermost base drum is held by a second holding member, and a next lower base drum is held by a first holding member respectively. Thereafter the uppermost base drum is separated from the next lower base drum.