JP2767829B2 - Printing plate and printing method - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a lithographic printing plate and a printing method thereof.

<Prior Art> Conventionally, printing methods include a lithographic printing method,
A letterpress printing method or an intaglio printing method is known. Each of these methods creates a printing plate for each print item, and after printing, when printing another print item,
It is common practice to create a new printing plate.

<Problems to be Solved by the Invention> By the way, in a printing method such as planographic printing, letterpress printing, or intaglio printing, the same printing plate material cannot be used to print another pattern after printing is completed. However, it is necessary to newly make another printing plate, and there is a problem that the time and the material cost of the printing plate material increase. Also, the development of a printing process online with a computer has been desired but not realized.

Therefore, the present invention aims to provide a new printing plate and a new printing method using the printing plate that solve the above-mentioned problems, and there is no need to prepare a printing plate. The present invention provides a new printing plate that can be used repeatedly and can be printed on-line with a computer. Further, the present invention has an object to provide a new printing method using the new printing plate. And

<Means for Solving the Problems> In order to achieve the above object, the present invention is to arrange a group of charging elements in which a number of fine charging elements are regularly arranged on almost the entire surface of a substrate, Orientation in the direction, is a printing plate comprising a molecule film layer of which one surface is formed of a molecule having a lipophilic group and the other surface is a hydrophilic group, and the orientation of the molecule is changed by an electric field on the charging element group. A switch element is provided for each of the charging elements, and the charging element can be selectively charged by turning on / off the switching element. As the switching element, a transistor or a thyristor can be used, and in particular, a transistor can be used. In this case, semiconductors such as TFTs, MOSFETs, and MIMs can be used. Further, each of the charging elements may be provided with a capacitor element.

Further, by charging the charging element group of the printing plate in a pattern, the orientation of the molecules is changed in the pattern, and the surface is moistened with respect to the molecular film layer in which pattern-shaped lipophilic groups are arranged. This is a printing method in which water and ink are supplied and the ink attached to the lipophilic group of the molecular film layer is transferred to a printing medium.

<Operation> According to the present invention, a charging element group in which a large number of fine charging elements for forming a charging portion on the surface of a printing plate are regularly arranged over substantially the entire surface of a substrate, and the charging element group A molecular film layer made of molecules whose orientation is changed by electric charge is provided on one side, with one surface having a lipophilic group and the other surface being a hydrophilic group. That is, by charging the charging element of the portion to which the ink is to be attached, a pattern-shaped charged portion to be printed is formed, whereby the orientation of molecules corresponding to the charged portion changes, and the pattern is printed. The molecular film layer is constituted by the combination of the lipophilic group and the hydrophilic group. In other words, if the charging unit is, for example, the hydrophilic groups of the molecules of the molecular film layer on the charging element group are arranged toward the surface, the orientation of the molecules is reversed by the charging of the charging element, and the lipophilic group faces the surface. By supplying ink to the printing plate, the ink adheres to the surface of the printing plate in a pattern. Further, the molecular orientation of the molecular film layer may be either the hydrophilic group or the lipophilic group with respect to the printing plate surface. Printing is performed by transferring the ink adhered in a pattern to the printing medium.

In this case, each of the charging elements is provided with a switching element, and a current based on an image signal to be printed is input to a corresponding element of the charging elements to form the charging element in a pattern to be printed. Can be charged.

In this case, by providing each of the charging elements with a capacitor element, it is possible to improve the retention of the charged charge of the charged element of the charging element.

As the charging element as described above, for example, a matrix type pixel electrode used in a liquid crystal display or the like can be used.

In addition, the molecular film layer is formed in the shape of a film, and lipophilic groups and hydrophilic groups in the molecule can be arranged in a certain direction, and by reacting to electric charge, the pattern of the charged part can be accurately reproduced. Can be.

<Example> Hereinafter, an example of the present invention will be described in detail.

FIG. 1 is a schematic partial enlarged sectional view showing a basic structure of a printing plate according to the present invention, wherein a printing plate (1) is a substrate (2).
Charging element (3) formed in a matrix on, the film-like thereon, for example, an organic compound with basic structure having a hydrophilic group COOH and Oyayumoto CH ₃ as represented by CH ₃ -R-COOH A molecular film layer (4) composed of molecules and oriented in a certain direction is formed. The molecular film layer (4) is preferably a film having a plurality of layers arranged in the form of a monomolecular film and having particularly excellent water retention. Furthermore, since the organic compound molecule has polarity and the charge is biased, the charge is positive for the CH ₃ group and COOH
The group is negatively biased.

Therefore, when the charging element (3) is positively or negatively charged, the COOH group or the CH ₃ group is oriented toward the charging element (3), and the direction of the molecule changes.

FIG. 2 shows a printing plate (1) from which a molecular film layer has been removed, and a plurality of charging elements (3) for forming a charged portion on a substrate are arranged at regular intervals at very small intervals over almost the entire surface. An image signal is input between the charging elements (3) through signal electrodes (Y ₁ ), (Y ₂ )... And scanning electrodes (X ₁ ), (X ₂ ). In this case, a switch element (5) is provided in each charging element (3), and the switch element (5) corresponding to the portion where the current has flowed to both the scanning electrode and the signal electrode is operated, and the switching element (5) is operated. The charging element (3) is charged.

FIG. 3 is an enlarged explanatory view of a portion of the switch element, and FIG. 4 is an explanatory diagram of a portion taken along line BB of FIG. The switching element is composed of a thin film transistor (TFT), and has a gate electrode (20), a source electrode (21), and a drain electrode (2
2), an insulating layer (23) and an amorphous Si layer (24).

The gate electrode (20) is insulated from other electrodes by the insulating layer (23). The drain electrode (22) is a charging element (3)
And the source electrode (21) is connected to the signal electrode (Y ₁ ). Further the gate electrode (20) is connected to the scan electrodes (Y _1). Thus, the electrification of the charging element (3) can be selectively performed depending on the presence or absence of the current of the scanning electrode and the signal electrode.

As the material of the charging element, any material may be used as long as it has a high electrical conductivity regardless of whether it is transparent or opaque, but a metal such as copper, aluminum, silver, and gold, or ITO (indium oxide / tin oxide) is appropriately selected. Can be adopted.

Also, for the purpose of preventing the charge amount of the charging element from decreasing,
Each element may be provided with a capacitor element (25). This capacitor element may be provided with a conductive layer facing the charging element.

Al ₂ O with high wear resistance
_3. A ceramic insulating material such as SiO ₂ , a fluororesin, a silicon resin, and other polymer insulating materials can be used.

In addition, the printing plate including the above-described molecular film layer and the circuit configuration including the charging element may be formed on a flexible base material such as a synthetic resin sheet and wound around a cylindrical cylinder, or Formed on a plate-shaped substrate,
Of course, a planographic printing plate can also be used.

Since the charging element is charged according to the image pattern of the original on the printing plate of the present invention configured as described above, the molecular orientation of the molecular film layer (4) changes corresponding to the charging element.
If this is a molecular film in which molecules are arranged so that hydrophilic groups are directed to the printing plate surface, a positive charge is applied, molecules corresponding to the image pattern are directed to the lipophilic group, and the others are directed to the surface. By supplying the dampening solution and the ink in the contact state, printing is performed by adhesion of the ink to only the lipophilic portion on the molecular film layer and transfer of the attached ink to the printing medium.

In the molecular film layer, either the hydrophilic group or the lipophilic group may face the printing plate surface, but it is necessary to reverse the charging portion of the charging element in a positive / negative relationship.

FIG. 5 shows a printing system using the printing plate of the present invention. A document (11) is scanned by a color separation device such as a scanner (12) to provide a key (Y), a red (M), an eye (C), and a black (Bk). ) Are separated into four colors, and these separated signals are input to an arithmetic unit (13) including a CPU. In this case, it may be stored in the external storage device (14). If necessary, the color-separated signals are replaced with red (R), green (G), and blue (B) signals for a monitor television, and the monitor television (15) is used to correct the color separation conditions. May be confirmed. Next, the color-separated Y, M, C, and Bk signals are input to the printing plates of each color. In the case of FIG. 5, Y
Is input to the printing plate (1) for the Y plate, and is omitted for other M, C, and Bk. Hereinafter, the case of the printing plate (1) for the Y plate will be described briefly, but the same applies to printing plates of other colors.

Next, the signal of the image input to the printing plate (1) changes the molecular film layer on the surface of the printing plate (1) to the orientation of the molecules of the molecular film layer together with the pattern-like charging with respect to the image of the original as described above. Then, a lipophilic portion is formed, fountain solution and ink are supplied from each supply device, and the ink adheres to the lipophilic portion (7) corresponding to the image. In this way, the ink adhering to the above-described printing plate is passed through the printing plate (9) such as paper between the rotating printing plate (1) and the impression cylinder (8), so that the printing plate (9).
And a printed image (10) is obtained.

Practically, printing is performed on a printing medium via a blanket cylinder on a plate cylinder to which ink is attached as in offset printing.

By using the present printing plate as described above, printing can be performed using a normal offset ink.

Further, the molecular film layer provided on the printing plate may be one in which the orientation of molecules is irreversibly changed by once applying an electric charge.

<Effects of the Invention> As described above, the printing plate and the printing method of the present invention provide the following effects.

The printing plate of the present invention is charged in the form of an image pattern by charging the charging element, thereby changing the molecular orientation of the molecular film layer corresponding to the charged portion so that the lipophilic group faces the printing plate surface in the image pattern, As a result, the lipophilic portion can be accurately formed on the document, and it is not necessary to separately prepare a printing plate.

In other words, after printing of an image is completed, another image can be printed only by inputting an image signal.
Unlike the conventional printing method, there is no need to create a new printing plate for each printing item, and the printing plate that has been used once can be used repeatedly. This saves printing plate materials and shortens the time required for printing plate creation. Can be measured.

Further, it is possible to construct a printing process online with a computer.

Therefore, direct printing by image transmission from a remote place is also possible.

[Brief description of the drawings]

FIG. 1 is a schematic partial enlarged sectional view showing the basic structure of the printing plate of the present invention, FIG. 2 is a partially enlarged explanatory view of the printing plate excluding a molecular film layer, and FIG. FIG. 4 is an explanatory cross-sectional view taken along the line BB of FIG. 3, and FIG. 5 is an explanatory view of a printing system using the printing plate of the present invention. DESCRIPTION OF SYMBOLS 1 ... Printing plate, 2 ... Substrate, 3 ... Charging element 4 ... Molecular film layer, 5 ... Switching element 7 ... Lipophilic part corresponding to image 8 ... Impression cylinder, 9 ... Printed object 10 ... Printed image, 11 ... Document 12 ... Scanner, 13 ... Calculation device 14 ... External storage device 15 ... Monitor television 20 ... Gate electrode, 21 ... Source electrode 22 ... Drain electrode, 23 ... ... Insulation layer 24 ... Alpha MOS Si layer, 25 ... Capacitor element

Claims (4)

(57) [Claims] 1. A charging element group in which a large number of fine charging elements are regularly arranged on substantially the entire surface of a substrate, and the charging element group is oriented in a fixed direction on the charging element group. A printing plate, comprising a molecule film layer formed of a molecule whose other surface is a hydrophilic group and whose molecular orientation changes by an electric field, on the charging element group. 2. A printing plate according to claim 1, wherein each of said charging elements is provided with a switching element, and said charging element is selectively chargeable by ON / OFF of said switching element. 3. The printing plate according to claim 1, wherein each of the charging elements is provided with a capacitor element. 4. A molecule in which the charged element group of the printing plate according to claim 1 is charged in a pattern to change its molecular orientation in the pattern, and a pattern of lipophilic groups is arranged on the surface. A printing method, comprising supplying fountain solution and ink to the film layer, and transferring the ink attached to the lipophilic group of the molecular film layer to a printing medium.