JPS635995A - Printing method - Google Patents

Abstract

PURPOSE:To ensure that an ink is not dried, there is no need for cleaning and it is possible to print at any time, by forming a printing area on the surface of a printing medium by discharge breakdown, adhering an ink melted by heating to the printing area, and transferring the adhered ink onto a printing material. CONSTITUTION:A printing medium 104 is provided with a conductive layer 102 on one side of a base 102, and with an ink-repellent layer thereon. With a voltage applied between a recording electrode needle 105 and an earth roller 106 from an electrical signal source 109, an electric current flows through the ink-repellent layer 103 and the conductive layer 102, whereby the ink-repellent layer and the conductive layer are broken down to form a printing area 108. The printing medium 104 is then passed between a heated roller 111 constantly provided with a thin layer 112 of a heat-fusible ink 113 on the surface thereof and a pressure roller 115, whereby the ink 116 is adhered only to the printing area. The printing medium 104 and a printing material 123 are laid one on the other, and are passed between a heated roller 121 and a pressure roller 122. The ink 124 adhered to the printing area is melted by the heat supplied from the heated roller 121, and is transferred onto the surface of the printing material. Accordingly, there is no need for cleaning out the ink.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a printing method that can easily print electrically using discharge breakdown.

2. Description of the Related Art As a method for performing lithographic printing without supplying dampening water, there is a printing method called dry offset that utilizes the ink repellency of silicone, fluorine compounds, and the like. (for example,
Special Publication No. Sho 44-23042, Special Publication No. Sho 46-1604
(No. 4, Japanese Patent Application Laid-Open No. 50-50102) This method forms the non-image area with an ink-repellent material and selectively attaches ink only to the image area without using dampening water. It is something that makes you

The silicone resin in the image area is removed using electrical discharge destruction.
A printing method is known in which ink is placed on an image area and then transferred to a non-printing material. (Japanese Patent Publication No. 52-30857) The printing medium used in this method has a conductive layer on one side of an ink-receptive support that can be partially removed by discharge destruction, and an ink-repellent layer on the conductive layer. It has a structure with layers.

The method of removing the ink-repellent silicone resin in the image area by electric discharge is the same as the conventionally well-known discharge recording method, in which a current is passed from a conductive electrode needle to the conductive layer of the printing medium, and the silicone resin is removed together with the conductive layer. also destroy.

Problems to be Solved by the Invention However, in the printing method described above, the ink dries at room temperature, so cleaning after use is essential, and it has not been possible to easily use it as a facsimile or printer.

The present invention takes these points into consideration and provides a dry offset printing method that allows printing at any time without worrying about the ink drying out and without cleaning.

Means for Solving the Problems In order to solve the above problems, the printing method of the present invention comprises providing a conductive layer on one side of an ink-receptive support that can be partially removed by electrical discharge breakdown, and further comprising: Using a printing medium equipped with an ink-repellent layer, an image area that does not repel ink is drawn on the surface of the printing medium by electrical discharge breakdown, and heated and melted ink is brought into contact with the image area. Printing is performed by applying ink to the image area and transferring the ink adhered to the image area to the printing medium.

Operation The present invention enables dry offset printing, which can be used in facsimile machines and printers, unlike before, by using the above-described method.

EXAMPLE Hereinafter, a printing method according to an example of the present invention will be described with reference to the drawings.

FIG. 1 is a diagram illustrating the printing method of the present invention.

In FIG. 1(a), a printing medium 104 has a structure in which a conductive layer 102 is provided on one side of a support 102, and an ink-repellent layer is further provided on the conductive layer 102. This printing medium is placed between the ground roller 106 and the recording electrode needle 105 as shown in the figure. When a voltage is applied between the recording electrode needle 105 and the ground roller 106 from the electric signal source 109, a current flows through the ink-repellent layer 103 and the conductive layer 102, destroying the ink-repellent layer and the conductive layer. The brittle ink-receptive surface of the support is exposed. This part becomes the drawing part 108. As shown in FIG. 1(b), the print medium on which the image area has been formed is moved between a heat roller 111 on which a thin layer 112 of heat-melting ink 113 is always formed, and a pressing roller. 115. 114 is a knife for forming a thin layer of ink on the surface of the heat roller. Ink 116 adheres only to the image area where the ink receptive surface is exposed.

In this way, the print medium with ink attached to the printed area is
The ink 124 adhering to the image area is melted by the heat of the heat roller 121, and is applied to the surface of the printing material. Transcribe.

125 indicates the ink finally transferred to the printing material.

The explanation of FIG. 1 merely explains the principle of the printing method of the present invention, and it goes without saying that the method of the present invention is not limited to the means used in the above explanation.

The discharge recording method of Fig. 1 (al) is already a well-known method. The recording needle may be a single needle or there may be multiple needles. The heat roller of Fig. 2 (b) The entire body may be heated together with the presser roller and knife. The same can be said of the heated transfer shown in FIG. 3(C).

Example 1 Aluminum was vacuum-deposited on a 25 μm polyethylene terephthalate film to a thickness of 600 μm, and a hardening agent (Catalyst P L
-4 Shin-Etsu Chemical Co., Ltd.) mixed at 1% with respect to the resin in a toluene solution and dried (150°C for 5 minutes) to form an ink-repellent silicone resin layer with a thickness of about 0.5μ or less. and created print media.

This printing medium was layered on a commercially available discharge recording device (UA720K Nippon Aleph), and an applied voltage of 4
Characters were recorded at 5V.

As shown in FIG. 1 (bl), a rubber heat roller with a diameter of 50 cm heated to approximately 100° C. was brought into contact with and pressed against the surface of the print medium thus obtained.

Next, apply 3.5 liters of carnauba wax to the surface of the heat roller.
Parts by weight, 3.5 parts by weight of paraffin wax, 1 part by weight of carbon
A solid hot-melt ink consisting of parts by weight is pressed;
The ink thickness was adjusted to approximately 10 μm using a knife. Rotate the presser roller to press the print medium approximately 1
0 (7) When I was able to move it in 7 seconds, the character part (printing part)
Ink adhered to the surface.

Next, a paper (printing material) 123 is placed over the surface of the print medium 104 with the ink attached only to the image area, and the paper (substrate to be printed) is placed between the heat roller 121 and the pressure roller 122 as shown in FIG. 1(C). passed through. As a result, the characters could be printed clearly on the paper. 125 is the ink transferred onto the paper.

Example 2 After hot-melting ink was placed on the discharge-recorded printing medium made in Example 1 in the same manner as shown in Figure 1 of Example 1, the ink was applied to the heated transfer roller 201 as shown in Figure 2. was transferred and then transferred again to the printing substrate. As a result, the outline could be printed more clearly than in Example 1.

Although a transfer roller was used in this embodiment, it goes without saying that the procedure of the present invention will not be impaired even if a belt-shaped roller is used instead of a roller.

Example 3 10 parts by weight of urethane resin (Crispan 7209 Dainippon Ink & Chemicals Co., Ltd.), 1.5 parts by weight of fine powder silica, and 87.5 parts by weight of ethyl acetate were thoroughly mixed and dispersed, and a crosslinking agent (Crispan 7209 by Dainippon Ink & Chemicals Co., Ltd.) was thoroughly mixed and dispersed. A coating containing 1 part by weight (Kagaku Kogyo Co., Ltd.) was applied onto a 24μ polyethylene terephthalate film at a dry coating weight of 4 g/rd to form a nearly transparent roughened layer. On this roughened layer, aluminum was vacuum-deposited to a thickness of 600 mm, and on top of that, a hardening agent (Catalyst P L
Apply a toluene solution of silicone resin (KS722 Shin-Etsu Chemical Co., Ltd.) containing 0.5% by weight of Shin-Etsu Chemical Co., Ltd. (Shin-Etsu Chemical Co., Ltd.) and dry it (150℃).
5 minutes) to produce a printing medium on which a silicone resin layer with a thickness of approximately 0.5 μm was formed.

When this printing medium was applied to a Nippon Aleph printer in the same manner as in Example 1, the discharge breakdown characteristics were very good, and the probability of occurrence of discharge errors was significantly reduced compared to Example 1. Thereafter, printing was performed using the same procedure as in Example 1, and good printing results were obtained.

Example 4 Instead of forming a thin film of heat-melting ink in the step of FIG. 1 (al) of Example 1, a commercially available thermal transfer sheet (Fuji Kagaku paper) was applied around the heat-1 roller 301 as shown in FIG. Co., Ltd.) 302 was wound, and ink was placed on each line portion of the printing medium 104. 303 is polyethylene terephthalate with a thickness of 6 μm, and 304 is an ink whose main component is heat-melting wax. The ink was able to adhere to the image area in the same manner as in Example 1. 305 is the ink that adhered to the image area.The results of further transfer to paper were naturally the same as in Example 1. .

Effects of the Invention As described above, the printing method of the present invention includes a conductive layer that is partially removable by discharge destruction on one side of an ink-receptive support, and an ink-repellent layer on top of the conductive layer. Using a printing medium equipped with the above-mentioned printing medium, draw an image area that does not repel ink on the surface of the printing medium by electric discharge breakdown, and bring heated and melted ink into contact with the image area to adhere the ink to the image area, - Since printing is performed by transferring the ink attached to the printed line onto the printing material, there is no need to remove and clean the ink after each print as in conventional offset printing, and the electrical signal can be directly applied to the printed material. This provides an excellent printing method.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram illustrating the printing method of the present invention, FIG. 2 is a conceptual diagram showing an embodiment for realizing the printing method of the present invention, and FIG. 3 is another embodiment for realizing the printing method of the present invention. FIG. 2 is a conceptual diagram showing an example. 101...Support, 102...Conductor layer, 103...Ink repellent layer, 104...
... Printing medium, 105 ... Recording electrode, 106
... Earth roller, 107 ... Electric signal source, 108 ... Image area created by discharge destruction, 111, 301 ... Heat roller, 112
... Thin layer of ink, 113 ... Ink, 114 ... Naifetsuji, 115 ...
... Pressure roller, 116, 305 ... Ink attached to the image area, 122 ... Pressure roller, 1
21... Heat roller, 123... Printing medium, 125, 203... Ink attached to printing medium, 201... Transfer roller, 302...
...Thermofusible ink sheet, 303...
Polyethylene terephthalate sheet, 304...
...Thermofusible ink.

Claims (3)

[Claims] (1) Using a printing medium having a conductive layer partially removable by discharge destruction on one side of an ink-receptive support and further having an ink-repellent layer thereon, the surface of the printing medium is An image area that does not repel ink is drawn by electric discharge breakdown, and the ink that has been heated and melted is brought into contact with the image area to adhere to the image area, and the ink that has adhered to the image area is transferred to the printing material. A printing method in which printing is performed by transferring the image onto a paper. (2) In the step of transferring the ink attached to the image area to the printing material, the ink is not directly transferred to the printing material, but is transferred once to the transfer medium and then transferred to the printing material.
Printing method described in section. (3) Claims (1) or (2) characterized in that the ink-receptive support has a structure in which an ink-receptive roughened layer is provided on the support. Printing method described in section.