JPS5934542A - Printing plate used for two-color electrostatic printing and its printing method - Google Patents

Abstract

PURPOSE:To attain easily a 2-color image, by forming an electrically conductive ink layer and an insulating ink layer patternwise on a zinc oxide photoreceptor, respectively. CONSTITUTION:A conductive thermosensitive transfer ink layer 2 is formed on a substrate 1 to form a conductive thermosensitive transfer material 3, and a fine zinc oxide powder-resin type photosensitive layer 5 is formed on a conductive substrate 4 to obtain a zinc oxide photoreceptor 6, and the ink layer 2 and the layer 5 are arranged so as to face each other. Thermosensitive transfer is carried out with a thermal element TPE, and the ink layer 2 of the material 3 is transferred to the layer 5 of the photoreceptor 6. On the other hand, an insulating thermosensitive ink layer 8 is formed on a substrate to prepare an insulating thermosensitive transfer material 9, and the ink layer 8 and the layer 5 of the photoreceptor 6 having the layer 2 transferred are arranged to face each other, and the ink layer 8 of the material 9 is transferred thermosensitively to the layer 5 of the photoreceptor 6 with the thermal element TPE.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a printing plate for two-color electrostatic printing and a printing method thereof, and more specifically, a conductive ink layer and an insulating ink layer are formed on a zinc oxide photoreceptor by a thermal transfer recording method or the like. The present invention relates to a printing plate for two-color electrostatic printing characterized by the following characteristics, and a two-color electrostatic printing method using the plate.

Conventionally, letterpress printing, gravure printing, offset printing, and the like have been used to obtain a large number of printed materials, but simple offset printing has been widely used for office printing. In this manufacturing method, a simple offset master plate is created by an electrophotographic method, but the offset printing method using the master plate lacks simplicity because it uses water and ink.

The object of the present invention is to have the simplicity similar to a copying machine, and to
It is an object of the present invention to provide a printing plate for two-color electrostatic printing that can easily print about 1000 copies and achieve a two-color image, and a printing method thereof.

Currently, in general offices, most black-and-white originals are used, and even if there are color originals, it is thought that there is little need for full-color originals. However, it is believed that there is a pent-up need for one color (black and white). Several methods have been proposed for two-color copying, but
There are currently no commercially available copying machines.

The present invention provides a printing plate for two-color electrostatic printing that achieves a two-color image, and a printing method thereof, which consists of a conductive ink layer and an insulating ink layer arranged in a pattern on a zinc oxide photoreceptor. The present invention relates to a two-color electrostatic printing printing plate and a two-color electrostatic printing method using the plate.

Step 3 (After charging the printing plate for two-color electrostatic printing, reversing development with A color toner of the same polarity as the charged charge, and exposing the entire surface, 8 colors 1 of the opposite polarity to the charged charge) - Perform normal development by -, then recharge to make the polarities of the A and B color toners the same, and transfer and fix the A and B color toners to the transfer object, or The printing plate is charged, reversely developed with A color toner having the same polarity as the charged charge, and transferred to a transfer object, then the printing plate is recharged, and 13 colors of polarity different from the charged charge are applied. This is a two-color electrostatic printing method characterized by performing normal development with toner, transferring it to the object to be transferred, and fixing it.

To explain the present invention in more detail with reference to the drawings, taking a thermal recording method as an example, as shown in FIG. 3) and zinc oxide fine powder on the conductive support (4)
A zinc oxide photoreceptor (6) provided with a resin photosensitive layer (5) is arranged so that the ink layer (2) and the photosensitive layer (5) face each other, and as shown in FIG. Thermal transfer is performed to transfer the conductive heat-sensitive transfer ink layer (2) of the conductive heat-sensitive transfer material (3) onto the photosensitive layer (5) of the zinc oxide photoreceptor (6). Here, the photosensitive layer portion of the zinc oxide photoreceptor (6) to which the conductive heat-sensitive transfer ink layer (2) has been transferred becomes an electrostatically conductive portion and releases corona charges.

Next, as shown in FIG. 3, an insulating heat-sensitive transfer material (9) having an insulating heat-sensitive ink layer (8) provided on a support (7) and a zinc oxide film having a conductive heat-sensitive transfer ink layer (2) transferred thereto. The photoreceptor (6) is arranged so that the ink layer (8) and the photosensitive layer (5) face each other, and as shown in FIG. 4, the photoreceptor layer (5) of the zinc oxide photoreceptor (6) is The insulating heat-sensitive transfer ink layer (8) of the insulating heat-sensitive transfer material (9) is thermally transferred thereon. Here, the photosensitive layer portion of the zinc oxide photoreceptor (6) to which the insulating heat-sensitive transfer ink layer (8) has been transferred becomes an electrically insulating portion from an electrostatic point of view, and prevents corona charges from escaping.

In the above manner, a zinc oxide photoreceptor (
A two-color electrostatic printing printing plate (12) having a conductive part (conductive heat-sensitive transfer ink layer part) (10) and an insulating part (insulating heat-sensitive transfer ink layer part) circle on the photosensitive layer (5) of 6).
) is created.

Although the thermal transfer recording method using a thermal head using five thermal elements TPE has been described above, it goes without saying that thermal transfer recording using a laser is also effective as a method for obtaining high-resolution images. In addition, in Figures 2 and 4, each member (3) and (
6), (9) and (6) are illustrated as being separated from each other, but in reality, they are usually arranged in contact with each other.

Here, the heat-sensitive transfer material used in the heat-sensitive transfer recording method is one in which a heat-melting ink layer is formed on a base film, and in the present invention, a conductive heat-sensitive transfer material provided with a conductive heat-sensitive transfer ink layer (2) is used. (3) and an insulating heat-sensitive transfer material (9) provided with an insulating heat-sensitive transfer ink layer (8) are used. As the base film, conventionally known base films can be used as they are, and there are no particular restrictions, such as polyester film, polycarbonate film, 1-IJ acetyl cellulose film, nylon film, double-quality paper, capacitor paper, and Krashin paper. , tracing paper, 2 cellophane, and other films having a thickness of 65 μm to 25 μm. The conductive heat-sensitive transfer ink layer (2) is composed of a conductive agent and a binder. Conductive agents include copper, iron, aluminum, silver, zinc, black iron oxide, copper oxide, copper iodide, copper chloride, silver oxide, co oxide, iron oxide, indium oxide,
Conductive powders such as carbon blanks, polymeric quaternary ammonium salts, polymeric electrolytes such as sodium polystyrene sulfonate, etc. can be used.

As a binder, carnauba wax, wood wax, beeswax,
Materials that can be easily melted by heat are used, such as waxes such as microcrystalline wax, or resins such as low molecular weight polyethylene and polyvinyl stearate. In addition, polystyrene, styrene-
Easily heat-meltable substances such as butadiene copolymers, polyvinyl acetate, cellulose esters, cellulose ethers, acrylic resins, or lubricating oils are used.

The insulating thermal transfer ink layer (8) is composed of an insulating agent and a binder. Insulating materials include epoxy resin, melamine resin,
Dielectric (insulating) resin powder such as phenol resin, fluororesin, polyimide resin, etc. can be used. The binder and softener used are the same as those used in the conductive transfer ink layer (2). however.

When the binder has sufficiently high insulating properties, it is not necessarily necessary to contain an insulating agent.

In addition, a conductive ink layer and an insulating ink layer can also be formed on a zinc oxide photoreceptor by a pressure-sensitive recording method. A method of forming a conductive ink layer is to write on writing instruments containing conductive substances (mainly carbon blanks) such as black pencils, black crayons, charcoal, conte, black felt-tip pens, and black ballpoint pens. There are also operations such as writing on black carbon paper or typing on a typewriter, etc. In addition, as a method for forming an insulating ink layer, a pressure-sensitive recording medium having an insulating ink layer is pressure-sensitive, and this is coated with waxes, oils such as carnauba wax, paraffin wax, mineral oil, vegetable oil, and dispersants, etc. A surfactant, metal x soap, etc. are applied to thin paper, plastic film, etc. using an ink mill or a ball mill, and then set to solidify at room temperature.

Hereinafter, an example of a process of performing two-color electrostatic printing using this two-color electrostatic printing printing plate (121) will be described.Other examples will be described in Examples.

As shown in FIG. 6, this two-color electrostatic printing printing plate (I2) is uniformly negatively charged by a charging device (13).

Then, charge escapes only from the conductive portion (10), and an electrostatic latent image is formed. Next, as shown in FIG. 7, reversal development is performed using a magnetic brush method, cascade method, etc., using negative A color toner (14) having the same polarity as the charged charge, and the A color toner 0 (A) becomes conductive. Sexual part (10
). Next, as shown in FIG. 8, when the two-color electrostatic printing printing plate (121) is exposed to white light on its entire surface, a negative charge remains on the insulating partial circle, so as shown in FIG. When the color toner (151) is similarly developed using the angry brush method, cascade method, etc., the eight color toners (15) adhere to the insulating portion (11).Next, as shown in FIG. 141 and the 8-color toner (15) are negatively (or positively) charged by the charging device (13) in order to match the polarity.
As shown in the figure, the transfer object (16) is coated with toner (14HI9).
The toner (14) is placed on a two-color electrostatic printing printing plate (12) developed by The toner (14) (15i) on the printing plate (121) for two-color electrostatic printing is electrostatically transferred to the transfer target (I6) by applying it with the device (I3). Next, as shown in FIG. .

The object to be transferred (16) is separated from the printing plate (12) for two-color electrostatic printing.

By heating, the A-color toner (14) and the 8-color toner 4151 are fixed onto the transfer object (161).

Next, examples of the present invention will be described below.

[Example 1] Carbon black 28 parts by weight Paraffin wax (Microcrystalline wax melting point 8
0℃) 14
Horn trichloroethane 57
//Dehydrated castor oil 1
Heat and mix at the above ratio to form a slurry-like conductive substance coating liquid. This is uniformly applied to a thickness of 5 μm on a 15 μm thick capacitor paper and dried to form a conductive heat-sensitive transfer material.

Polyethylene powder 7 parts by weight Microcrystalline wax 11 Polyvinyl butyral
2 〃Methyl alcohol 80
Mix well in the above proportions, apply uniformly to 15μ capacitor paper to a thickness of 7μ using a coating machine equipped with a drying device, and dry to obtain an insulating heat-sensitive transfer material.

Using the conductive heat-sensitive transfer material and the insulating heat-sensitive transfer material manufactured as described in Section 2 above, conductive heat-sensitive transfer ink images and insulating heat-sensitive transfer materials were respectively transferred onto zinc oxide photosensitive paper T040 manufactured by Tomoe Paper Manufacturing Co., Ltd. using a heat-sensitive transfer printer. An ink image is formed to form a printing plate for two-color electrostatic printing.

This printing plate for two-color electrostatic printing was uniformly subjected to a negative corona discharge (-6.5 KV) in a dark place, and a black negative type toner manufactured by Toyo Ink Mfg. Co., Ltd.
N-1 and Tsukiyari 7 E F V 150 manufactured by Nippon Tetsuko Co., Ltd.
/250 developer using a magnetic brush method to form a black toner image on the conductive area. positive development to form a red toner image on the insulating area, followed by positive corona discharge (
After uniformly applying +6.5 KV), a piece of paper was placed, a negative corona discharge (-65 KV) was applied to the back side, black and red toner was electrostatically transferred to the paper, and then heated and fixed. As a result, a two-color printed matter of red and black was obtained. By repeating this operation, a large number of color printed matter could be obtained.

[Example 2] Carbon black 24 parts by weight dense wax
12 Trichloroethane
61 tt dehydrated human oil
Heat and mix at the above ratio to form a slurry-like conductive substance coating solution. This is uniformly coated to a thickness of 10 μm on a 15 μm thick capacitor paper and dried to form a conductive heat-sensitive transfer material.

Vinyl chloride/vinyl acetate copolymer 10 parts by weight Carnauba wax 7 Castor wax
1111 Ethyl acetate
50 Toluene 22
〃'' The mixture was thoroughly heated and mixed at the ratio shown in the above, and the mixture was applied to a thickness of 10 μm on a 15 μm thick capacitor paper and dried to obtain an insulating heat-sensitive transfer material.

Using the conductive heat-sensitive transfer material and the insulating heat-sensitive transfer material produced as described above, zinc oxide photosensitive paper T manufactured by Tomoe Paper Manufacturing Co., Ltd.
A conductive heat-sensitive transfer ink image and an insulating heat-sensitive transfer ink image are respectively formed on 055 by a heat-sensitive transfer printer to obtain a printing plate for two-color electrostatic printing.

This two-color electrostatic printing plate was fixed to a pin bar attached to a grounded metal plate, and a negative corona discharge (=6.5 KV) was uniformly applied in a dark place. Negative type toner TJ i o f ax
N-1 and carrier EFV150/25 made by Nippon Tetsuko Co., Ltd.
Reversal development is performed using a magnetic brush method using a developer consisting of 0,
A black toner image is formed on the conductive part, a paper with pin holes is inserted and placed on the pin bar, a positive corona discharge (+6KV) is applied to one paper, and the black toner is electrostatically transferred to the paper. and fixed by solvent vapor. Next, in a bright place, negative corona discharge was uniformly applied to the two-color electrostatic printing printing plate in the same way, and positive development was performed using a positive type blue developer (C manufactured by Toyo Ink Mfg. Co., Ltd.) using the magnetic brush method. Then, a blue toner image is formed on the insulating part, and the paper on which the previous black toner image was formed is again inserted and placed on the pin bar to align the paper, and a negative corona discharge (- 6,5K V
), a blue toner was electrostatically transferred, and a blue and black two-color printed matter was obtained by fixing with solvent vapor.

By repeating this operation, a large number of color printed matter could be obtained.

[Example 6] Carbon blank 17 parts by weight paraffin wax (n-paraffin melting point 80-85°C)
17 Trichloroethane 65 parts by weight Dehydrated castor oil 1 Heat and mix thoroughly in the proportions shown in -1- to obtain a slurry-like conductive substance coating liquid. This was uniformly coated to a thickness of 5 μm on a 12 μm thick polyethylene terephthalate plate and dried to obtain a conductive heat-sensitive transfer material.

Fluororesin powder 5 parts by weight Paraffin wax 15 Trichloroethane
80〃Heat and mix well in the above proportions, apply the mixture uniformly to a thickness of 7μ on a 12μ thick polyethylene terephthalate, and dry to obtain an insulating heat-sensitive transfer material.

Using the conductive heat-sensitive transfer material and the insulating heat-sensitive transfer material produced as described above, zinc oxide photosensitive paper T manufactured by Tomoe Paper Manufacturing Co., Ltd.
A conductive heat-sensitive transfer ink image and an insulating heat-sensitive transfer ink image are respectively formed on O57 using a heat-sensitive transfer printer to form a printing plate for two-color electrostatic printing.

Using this printing plate for two-color electrostatic printing, using the black negative-type developer and red positive-type developer of Example 1, and the method of Example 2, it is possible to obtain two-color printed matter in red and black. Ta.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is an explanatory diagram showing a state in which a conductive heat-sensitive transfer material and a zinc oxide photoreceptor are opposed, and FIG. 2 is a diagram showing a conductive heat-sensitive transfer material using a thermal element T P 'E. An explanatory diagram showing the thermal transfer of an ink layer. Fig. 6 is an explanatory diagram showing a state in which an insulating thermal transfer material and a zinc oxide photoreceptor to which a conductive thermal transfer ink layer has been transferred are facing each other. Fig. 4 is an explanatory diagram showing a state in which a thermal element TPE is used. FIG. 5 is an explanatory diagram showing thermal transfer of an insulating thermal transfer ink layer, and FIG. 5 is an explanatory diagram showing a two-color electrostatic printing plate having a conductive part and an insulating part. This is to explain how to use a printing plate for electrostatic printing. Figure 6 is an explanatory diagram showing a state in which a printing plate for two-color electrostatic printing is uniformly charged, and Figure 7 is an explanatory diagram showing a state in which a printing plate for two-color electrostatic printing is uniformly charged. FIG. 8 is an explanatory diagram showing a state where the entire surface has been exposed to light. FIG. 9 is an explanatory diagram showing a printing plate which has been normally developed with eight color toners. FIG. A color toner and 8
An explanatory diagram showing an operation for making the polarities of color toners the same,
FIG. 11 is an explanatory diagram showing the process of electrostatically transferring the A-color toner and eight-color toner to a transfer object at the same time, and FIG. 12 is an explanatory diagram showing the fixed transfer object. (1)... Support (2)... Conductive thermal transfer ink layer (3)... Conductive thermal transfer material (4)... Conductive support (5)... Photosensitive layer (6) ... Zinc oxide photoreceptor (7) ... Support (8) ... Insulating heat-sensitive transfer ink layer (9) ... Insulating heat-sensitive transfer material (10
)...Conductive part Circle...Insulating part (12...
・Printing plate for two-color electrostatic printing (13)...Charging device 0
4J...A color toner (15)...8 color toner (1
6) ... Transferred object patent applicant Kazuo Suzuki, Representative of Toppan Printing Co., Ltd.

Claims (4)

[Claims] (1) A printing plate for two-color electrostatic printing, characterized in that a conductive ink layer and an insulating ink layer are respectively formed in a pattern on a zinc oxide photoreceptor. (2) A printing plate for two-color electrostatic printing according to claim (1), wherein a conductive heat-sensitive transfer ink layer and an insulating heat-sensitive transfer ink layer are formed in a pattern by a heat-sensitive transfer recording method. (3) A printing plate for two-color electrostatic printing in which a conductive ink layer and an insulating ink layer are formed in a pattern on a zinc oxide photoreceptor is charged, and A color toner having the same polarity as the charged charge is applied. After reversal development and full-surface exposure, normal development with 8 color toners of polarity different from the above-mentioned charges, and then recharging.
A two-color electrostatic printing method characterized in that the polarities of color A and B color toners are made the same, and the A color and B color toners are transferred to a transfer object and fixed. (4) A printing plate for two-color electrostatic printing on which a conductive ink layer and an insulating ink layer are respectively formed in a pattern on a zinc oxide photoreceptor is charged, and an A of the same polarity as the charged charge is charged. Reversal development is performed using color toners, and the image is transferred to the object to be transferred. Next, the printing plate is recharged, and normal development is performed using 8 color toners having a polarity different from the charged charge, and the image is transferred to the object to be transferred and fixed. A two-color electrostatic printing method that is characterized by