JPS59152470A - Printing method - Google Patents

Abstract

PURPOSE:To obtain a satisfactory print with a relatively low voltage by impressing a voltage between the conductive ink put into an ink container and recording paper and atomizing the ink thereby obtaining the electrostatically charged ink mist to be stuck on the recording paper on which an electrostatic latent image is formed. CONSTITUTION:Conductive ink 2' is obtd. by removing impurities from the ink and adding an inorg. salt such as sodium salt or potassium salt thereto. An electric power source 8' is connected between an electrode 7' disposed on an ink container 1 and the ground, and a rotary support 9 is grounded as well. A voltage is impressed between the ink 2' in the container 1 and the support 9, and the ink 2' is electrostatically charged to a single polarity. The ink 2' is excited by an ultrasonic oscillator 6 and is atomized. The atomized ink is suspended in the space part 11 in the container 1. The electrostatically charged conductive mist is run into a duct 3 by the operation of a pump 4 and sticks on electrostatic recording paper 10 in window 5, by which the electrostatic latent image on said paper is developed. The generation of uneven printing is thus made difficult and the good chromaticity is obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a printing method in which a charged ink mist is attached to a recording paper on which an electrostatic latent image has been formed and developed.

Mouth, prior art An example of a conventional printing method will be explained starting from the apparatus shown in FIG.

In the figure, (1) is an ink container containing ink f2+, (3) is an annular duct that communicates with the ink container (1), and approximately in the middle of this duct (3) is a pump (
4), and a window (5) opened to the duct side is formed between the ink container ti> and the pump (4). (6) is an ultrasonic vibrator attached to the lower part of the ink container +1), and (7) is the ink container (1).
This electrode (7
) and the ink f2+, a high voltage power supply (8) is connected to apply a high voltage.

(9) is a rotating support, (101 is an electrostatic recording paper that is conveyed along the curved surface of the rotating support (9), and a part of this electrostatic recording paper (10j is formed in the duct (3)). window (5
) is facing.

The operation of this device is based on the space (1
1), apply a high voltage between the electrode (7) and the ink (2J) to cause a roller discharge, and the ultrasonic vibrator (6) to ink (2).
1 is excited to atomize and charge the ink f2J to monopolar,
Due to the operation of the pump (4), the duct (
3) As shown in FIG. 2, the electrostatic recording paper (101) having an electrostatic latent image formed thereon is selectively deposited on the electrostatic recording paper (101) through the window (5) of the duct (3) and developed.

By the way, in the above-mentioned conventional printing apparatus, ink mist adheres to the electrode (7) in the ink container ill during use, and the inter-electrode withstand pressure decreases considerably, causing the voltage between the electrode (7) and the ink container fi+ to deteriorate. Poor insulation makes it difficult to discharge.

Therefore, the amount of charge on the ink mist decreases, and the electrostatic recording paper (
The amount of particulate ink (2i) adhering to 10j changes, causing print unevenness, making it difficult to maintain a constant print quality.Also, it requires a high voltage power supply and is dangerous, so its handling is difficult. etc., etc. In addition, the electrode (
7) had to be cleaned regularly and maintenance was very troublesome.

OBJECTS OF THE INVENTION The present invention aims to produce good prints and improve their quality.

21 Structure of the Invention The present invention is directed to a printing method in which a charged ink mist is attached to a recording paper on which an electrostatic latent image has been formed and developed, and the charged ink mist is mixed with a conductive ink contained in an ink container to generate an electrostatic latent image. A voltage is applied between the recording sheets to atomize the conductive ink in the ink container. do. In the figure, the same reference numerals as in FIG. 1 indicate the same parts, and the explanation will be omitted. The only difference from FIG. 1 is the means for charging the ink. That is, as shown in Fig. 3, (the nail is conductive ink, and 21 is the process of removing impurities from the ink, adding inorganic salts such as sodium salts and potassium salts to the ink, etc.) (7) is an electrode disposed on the string ink container (1), and a power source (8) is connected between this electrode (7) and the ground. The body (9) is also grounded using appropriate means.Therefore, the ink (2) in the ink container (1) and the rotating support body (9) are grounded.
), and as a result, the conductive ink (2) is unipolarly charged, and this charged conductive ink (
2') is atomized by vibration by the ultrasonic vibrator (6),
The electrically charged conductive ink mist flows into the duct (3) from the pump (4), and is electrostatically discharged by the pump (5). Recording paper (1
It adheres to 0. and becomes a palm image.

In addition, in the above-mentioned missing example, by applying a voltage between the sex ink (2) and the ground and grounding the rotating support (9), the above-mentioned tie/telephone pole ink (21) and electrostatic recording Paper (10
・Although a potential difference is created between the electrostatic recording paper (10'), it is possible to avoid applying an unnecessary potential to the electrostatic recording paper (10') by using appropriate means. Of course, it is sufficient to maintain the potential difference between the two.

E.9 Effects of the Invention According to the present invention, unlike the conventional charging method using discharge, the electrification state of the ceramic electrode is stabilized, and insulation properties can be easily ensured. By using this stable fluorescent particulate ink, printing unevenness is less likely to occur and excellent chromaticity is obtained, and halftone and degreased printing is also possible, greatly improving print quality. do. Furthermore, a large amount of charged ink mist can be obtained at one time with a relatively low voltage without requiring a high voltage. Furthermore, there is no need to clean the electrodes, maintenance is very simple, and high voltage is used. This also reduces the risk of injury, allowing workers to work safely. In addition, since the amount of ink can be controlled by adjusting the output of the ultrasonic vibrator and adjusting the feed rate of the pump, it is easy to adjust the print brightness and shade, and it is also easy to adjust the amount of charge of the ink.

[Brief explanation of the drawing]

The first factor is an explanatory diagram showing an example of a conventional printing method, and the second factor is
The figure is a partially enlarged view of FIG. 1, and FIG. 3 is an explanatory diagram showing an embodiment of the present invention. (1)... Ink container, (2)... Conductive ink, (
7) Electrode, (IIJ @ Electrostatic recording paper.

Claims (1)

[Claims] +1) A charged ink mist is applied to a recording paper on which an electrostatic latent image has been formed and is released into a printing method for development. A printing method characterized in that the conductive ink in the ink container is obtained by atomizing the conductive ink.