JPH03114833A - Manufacturing printing plate - Google Patents

Abstract

PURPOSE:To make it possible to easily manufacture a printing plate at a reasonable price by superimposing a carbon paper having carbon applied thereon on a sheet material, making the carbon adhered to the sheet material and forming a desired image on the sheet material. CONSTITUTION:A flash printing apparatus 4 is placed at a position where an image should be formed on a printing sheet 7 in such a manner that a surface of a thermal ink layer 6c of an ink sheet 6 is held in contact with a surface of a printing sheet 7. Then, a discharge lamp 5c is turned on and generates a flash. The flash is condensed by a reflector, so that a large part of the flash is transmitted outwardly through a transparent plate 5d provided below a lower opening of a light source room 5a to irradiate an original printing plate 2. Then, heat generated in an original carbon image Io is transmitted to the thermal ink layer 6c of the ink sheet 6 from the reflecting layer 6b, held in contact with the original carbon image Io through the base film 6a. Then, only a thermal ink layer 6c1 thus heated as above is melted and is heat-transferred onto the printing sheet 7 thereunder under pressure, thereby making it possible to easily manufacture a printing plate.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a method for easily producing a printing plate for use in screen printing or thermal transfer printing using ordinary carbon paper.

[Prior art and its problems]

FIG. 5 shows a conventional printing device (hereinafter referred to as a flash printing device) 50 that transfers an image using heat accompanying flash light.
shows. The flash printing device 50 roughly consists of a flash generation section 51, a printing original plate 52, and an ink sheet 53, which are stacked in order. The original printing plate 52 is made of a transparent thin sheet material, and the original image Io to be printed is formed on a portion 52a in contact with the ink sheet 53 using a blackish colorant such as carbon. The ink sheet 53 is formed by sequentially laminating a light reflecting layer 53a, a base film 53b, and a heat-sensitive ink layer 53c.

When printing is performed using the flash printing device 50 described above,
First, the flash printing device 50 is placed on the printing paper 54 at a position where it is desired to print an image. At this time, the thermal ink layer 53c and each surface of the printing paper 54 are brought into close contact. Under this condition, when the flash light generating section 51 generates a flash light, the flash light is absorbed by the carbon original image IO of the printing original plate 52, and the temperature of that portion increases. The heat is transmitted to the heat-sensitive ink layer 53c of the ink sheet 53, and the ink 53ct in that portion is transferred onto the printing paper 54. In this manner, the original image is thermally transfer printed onto the printing paper 54.

In the flash printing device 50 described above, the original image Io is required to be formed on the surface of the original printing plate 52 that comes into contact with the ink sheet 53 in order to quickly transfer the heat of the original image 10 to the heat-sensitive ink layer 53c. Therefore, it is necessary to draw the original image as an inverse image that is a mirror image of the image to be obtained (normal image). Drawing this reverse image is not easy and takes a lot of time. Therefore, in order to easily obtain a reverse image, -dan,
A method is adopted in which a normal image is drawn on another sheet of paper and the normal image is transferred onto the printing original plate 52 by, for example, a method such as thermal transfer. However, this method requires a separate device for thermal transfer, which increases costs. Furthermore, since it is a two-step operation in which the original image is drawn and then transferred, the troublesome work in producing the printing original plate is not resolved.

[Purpose of the invention]

The present invention has been made in view of the problems of the prior art described above, and it is an object of the present invention to provide a method that can produce a printing plate extremely simply and at low cost, by which an original image can be drawn as a normal image.

[Key points of the invention]

The main point of the present invention is that, in order to achieve the above object, carbon paper with carbon attached to one side is stacked on a sheet material to be a printing plate so that the carbon-attached surface is in contact with the sheet material, and the carbon paper or the sheet material The method is to apply pressure to the outer surface of one of the sheets to adhere carbon onto the sheet material, and to form a desired image on the sheet material.

[Embodiments of the invention]

Embodiments of the present invention will be described in detail below with reference to FIGS. 1 and 2.

FIG. 1 is a perspective view showing a plate making method as an embodiment of the present invention. In the figure, a printing original plate 2 made of a transparent thin polyester sheet is superimposed on a commercially available black carbon paper 1. In this case, carbon adhering surface 1 of carbon paper 1
A and one side (back side) 2a of the printing original plate 2 are overlapped so that they are in contact with each other, and one side 2a of the printing original plate is processed to have an appropriate roughness by applying matte treatment.

Next, an image to be printed is drawn on the surface (non-matte treated surface) 2b of the printing original plate 2 using the writing instrument 3. As the writing instrument 3 in this case, a hard brush such as a ballpoint pen or a pencil that can apply pressure to the tip is used. When the original printing plate 2 is removed from the carbon paper 1 after drawing the image, a reverse image of the image drawn on the front side 2b is carbon-copied onto the back side 2a of the printing original plate.

FIG. 3 is a schematic cross-sectional view showing a flash printing device 4 using the original printing plate 2 manufactured as described above.

The flash printing device 4 of this example has a structure in which a flash generating section 5, a printing original plate 2, and an ink sheet 6 are stacked in sequence between the conventional flash printing device 50 shown in FIG. The flash light generating section 5 is constructed by laying a reflecting plate along the inner surface of a housing 5b forming a light source chamber 5a, and installing a discharge lamp 5c in an upper space within the light source chamber 5a. discharge lamp 5c
For example, a xenon lamp used for a camera strobe can be suitably used. The lower part of the light source chamber 5a is open, and a transparent plate 5d made of glass or acrylic resin is attached to this open opening.

The printing original plate 2 described above is closely attached to the outer surface of the transparent plate 5d. In this case, the surface 2b of the printing original plate 2 (the surface to which the carbon original drawing machine 0 is not attached) is the transparent plate 5.
Place it close to d.

An ink sheet 6 is superimposed on the back surface 2a of the printing original plate 2 (the surface to which the carbon image is attached).

Ru. The ink sheet 6 is made of nickel (Ni), aluminum (AI), copper (
A light reflecting layer 6b made of vapor-deposited metal such as Cu) is laminated, and a heat-sensitive ink layer 6C made of heat-fusible color ink or the like is laminated on the lower surface thereof, forming a three-layer structure.

Such an ink sheet 6 is arranged so that the surfaces of the light reflective layers 8 and 5 are in contact with the back surface 2a of the printing original plate 2.

Alternatively, the ink sheet 6 may be wound up between a pair of reels and supplied to the lower part of the original printing plate 2.

According to this method, the ink sheet 6 can be updated easily, and the operability of the flash printing device 4 is improved.

In addition to black, color inks include 1 red) blue,
Alternatively, various colors such as gold and silver are appropriately selected depending on the intended use of the printed matter.

Next, an explanation will be given of the operating procedure and operation when printing is carried out using the flash printing device 4 in which the original printing plate 2 on which the above-mentioned original image is attached is set.

First, the flash printing device 4, which has been prepared for printing as described above, is placed at a position where it is desired to print an image on the printing paper 7. At this time, care must be taken to bring the surface of the thermal ink layer 60 of the ink sheet 6 into close contact with the surface of the printing paper 7.

Next, when the discharge lamp 5C is turned on and a flash is generated, most of the emitted light (indicated by the broken line) passes through the transparent plate 5d attached to the lower opening of the light source chamber 5a due to the condensing effect of the reflector. The light passes through, exits to the outside, and enters the printing original plate 2. Although the transparent original printing plate 2 allows light to pass through, the light does not pass through the portion of the back surface 2a of the original printing plate where the original carbon image Io is adhered and formed, but is absorbed by the original carbon image IO. As a result, the carbon original image Io absorbs the light beam and has heat. Other parts of the body do not generate heat because light passes through them. The transmitted light rays are reflected on the surface of the light reflective layer 6b of the ink sheet 6.

The heat of the carbon original image Io is transmitted to the heat-sensitive ink layer 6c via the base film 6a from the light reflection [8b] of the ink sheet 6 that is in close contact with it. Only the portion of the thermal ink layer 6cl to which this heat has been transmitted is melted, and this melted thermal ink layer 8cl is thermally transferred onto the lower printing paper 7. In this way, a copy image corresponding to the carbon original image IO on the back side of the printing original plate 2a is clearly printed on the printing paper 7 with the color of the thermal ink 6C.

By repeatedly performing the above-described printing operation while updating the ink sheet 6, a large number of copied images can be thermally transferred printed. In this case, if you use a normal ink sheet, the original printing plate 2
There is a risk that the carbon original image 1o formed on the ink sheet 6 may be transferred little by little to the ink sheet 6, but in this example, since the light reflecting layer 6b made of a metal vapor deposited film is laminated on the upper surface of the ink sheet 6, the transfer of carbon may be prevented. can be effectively prevented and clear printed images can be stably obtained over many times.

Next, FIG. 4(a) shows another embodiment of the present invention.

The explanation will be based on (b).

This example is an example of a method for producing a stencil.
As shown in a), the carbon paper 8 and the stencil original 9 are superimposed in the same manner as in the above embodiment. The stencil original plate 9 is composed of a base sheet (ea) through which ink and the like can pass, and a filler 9b such as wax that prevents the penetration of ink and the like is coated thereon. A stencil master 9 is placed on a flat substrate 10 such as a desk, and carbon paper 8 is superimposed thereon so that the carbon-attached surface 8a is in contact with the surface of the filler 9b of the stencil master 9. Then, a desired original image to be printed is drawn on the upper surface (carbon-free surface) 8b of the carbon paper 8 with strong writing pressure using a hard writing instrument 11 such as a pencil. As a result, the original image is copied as a carbon image onto the stencil master θ.

Next, as shown in FIG. 4(b), the carbon original image Io
A flash of light is projected from the lamp 12 onto the surface (filling agent) 9b of the stencil master 9 on which has been copied. In this case, if the stencil original plate 9 is made transparent, it is also possible to project a flash of light toward the back surface of the base (see). When a flash of light is projected, the temperature of the part to which carbon is adhered rises, and the filler 9b in that part is melted and removed, forming holes in the stencil master plate 9 through which ink can pass. With the above steps, the production of the stencil is completed. In this way, according to the plate making method of the present invention, a stencil can also be easily formed.

It should be noted that the present invention is not limited to the above-described specific embodiments, and it goes without saying that various modifications can be made within the technical scope of the present invention. For example, in producing a stencil, an original image may be drawn on a stencil master as in the case of the thermal transfer master shown in FIG. 2, and a reverse carbon image may be attached to the back surface. In this case, when printing is performed, printing ink may be applied to the surface of the stencil on the positive image side (the side to which the carbon image is not attached). Further, the matte treatment applied to the printing original plate can also be omitted. The matte treatment is a process performed to more firmly adhere carbon to the original printing plate, and may be omitted if the durability of the printing plate is not important.

〔Effect of the invention〕

As explained in detail above, according to the present invention, by overlapping general-purpose carbon paper and an original plate, it is possible to easily produce a printing plate by drawing the image that you want to print with a normal hard brush as a normal image. . Therefore, various printing plates such as stencils and thermal transfer printing original plates can be manufactured at extremely low cost.

[Brief explanation of drawings]

Fig. 1 is a perspective view showing a plate making process as an embodiment of the present invention, Fig. 2 is a partial sectional view showing the above plate making process, and Fig. 3 is a flash printing device using a printing plate produced through the above plate making process. Schematic cross-sectional views showing FIGS. 4(a) and 4(b)
6 are partial sectional views showing different steps in other embodiments of the present invention, and FIG. 6 is a perspective view showing a conventional flash printing device. 1.8...Carbon paper 2.52...Printing original plate 3.11...Writing utensil 4.50...Flash printing device 5.51...Flash generating part 6゜53...Ink sheet 7゜54...Printing paper 9...Original plate for stencil Io...Carbon original image Nicasio, Y1 calculation 4Q Mashishiki company Figure 1 Figure 21! ! C1 No. 31!1 (a) (b) Figure lE4

Claims (1)

[Claims] Carbon paper with carbon attached to one side is stacked on a sheet material that will become a printing plate so that the carbon-attached surface is in contact with the sheet material, and the outer surface of either the carbon paper or the sheet material is pressurized. A method for producing a printing plate, comprising depositing carbon on the sheet material and forming a desired image on the sheet material.