Wet type developing apparatus and wet type developing method

Abstract

A wet type developing apparatus is provided which allows printing in a quality that is stable at an increased printing speed and also with changes in physical property of a liquid developer. The wet type developing apparatus to this end includes a liquid developer feed pathway which comprises a developing roller 7 for feeding the liquid developer onto a photoconductor drum 3; an anilox roller 9 immersed in part in the liquid developer and driven to rotate in rotational contact with the developing roller; and a doctor blade 11 disposed in contact with a surface of the anilox roller for controlling the rate of drawing up of the liquid developer. The developing and anilox rollers have their peripheral surfaces moving in an identical direction and at an identical rate of movement in an area of their rotational contact. A toner charger 12 is disposed opposite to a surface of the anilox roller downstream of an area of contact of the doctor blade with the anilox roller and upstream of an area of rotational contact of the anilox roller with the developing roller in a rotation direction of the anilox roller.

Description

technical field [0001] The present invention relates to a wet developing device and a wet developing method using the device. The wet developing device and the wet developing method using the device are used in a wet electrophotographic printing machine to form a photosensitive layer with a liquid developer. Develop (visualize) the electrostatic latent image on the body drum. Background technique [0002] In a wet developing device, a portion of an anilox roller (supply roller, anilox roller) immersed in a liquid developer is rotated to contact the developing roller, and the liquid developer is supplied to the developing roller through the anilox roller, which is a photoreceptor drum. The developing roller is in rotational contact with the photosensitive drum, and the electrostatic latent image formed on the photosensitive drum is developed into a toner image. The toner image developed on the photoreceptor drum is transferred to paper (recording medium). [0003] In such a...

AI Technical Summary

Problems solved by technology

However, in general, when the viscosity of the liquid developer is 100 mPa.s or less, the toner concentration becomes low and the dispersibility of the toner particles deteriorates, so the toner formed on the surface of the developing roller If the film thickness of the layer is not more than 5 μm, the printing density tends to be insufficient. Therefore, conventionally, the toner layer is developed with a thickness of 5 to 40 μm, and the amount of liquid developer used is large.

[0008] Due to the above, when conventional liquid developers have used a viscosity of 100 to 1000 mPa.s, a liquid developer with such a high viscosity has a problem that it is difficult to stir its toner, resulting in an increase in production costs.

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