JPH07223356A - High density miniature printed matter - Google Patents

Abstract

PURPOSE:To provide high density miniature printed matter printed with a extremely small character or pattern (containing a copy of a photograph) showing a sharp full-color state even if enlarged and having a large quantity of data subjected to offset printing in small space. CONSTITUTION:In high density miniature printed matter obtained by an offset printing method equipped with a plate making process separating a manuscript into four colors of blue, red, yellow and black by an electronic plate making machine and applying dots by a dot generator to form a dot positive film at every color, a printing plate process baking the dot positive film to a PS plate and a printing process transferring the pattern of the printing plate obtained in a printing plate process to specific paper, damping water with pH4-7 of which the surface tension is set to 40-45dyne/cm is used in the printing process.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION This invention relates to high density mini prints obtained by offset printing.

[0002]

2. Description of the Related Art In recent years, with the development of office automation equipment such as computers, it has become possible to record a large amount of data on a flexible disk or optical disk, and to process a large amount of information in a narrow space.

However, the recording format of OA equipment is often different for each equipment. Therefore, even if these flexible disks or optical disks are carried around, it is often impossible to immediately read them when trying to view the information recorded on the flexible disks or optical disks.

[0004] Therefore, in most cases, the present situation is that they are often carried around in the form of printed matter.

[0005]

However, when it is attempted to obtain such a printed matter by offset printing, which is the most used printing method for full-color printing, the printed matter obtained by the conventional printing technique is a flexible disk or an optical disc. It takes a lot of space to record such a large amount of information.

That is, the offset printed matter is generally composed of the following plate making process, printing plate process and printing process. Plate making process The original (color film) is indigo (cyan), red (magenta), yellow (yellow) by an electronic plate making machine (scanner).
And 4 (sumi (black)) are color-separated, and a dot generator (halftone dot generator) is used to add a halftone dot for each color to produce a halftone positive film of each color.

Printing plate process The positive mesh film produced in the plate making process is superposed on the photosensitive surface of a PS plate (Presensitized Offset Plate) in which a photo-curing film is applied to an aluminum plate having a fine uneven surface for printing. , Halftone dots are printed on the PS plate.

Printing Process A PS plate having halftone dots printed thereon is set in a printing machine, and the pattern of the PS plate is transferred to paper. This offset printing method is widely used for printing calendars, catalogs, art books, etc. as the most suitable printing method for color printing.
Even if high-quality art paper is used, only a halftone dot having a screen frequency of 200 to 300 lines can be accurately obtained, and a printed product having a beautiful finish can be obtained.

In other words, in a printed matter having a screen frequency of 200 to 300 lines, even if a magnifying glass is used, a full-color character cannot read a very small character accurately. Further, if the design becomes too small, bleeding or the like will occur, resulting in a decrease in commercial value.

Therefore, even if the minimum number of characters is used, it is not possible to print a large amount of information on a single sheet of paper, and if a large amount of information is to be carried around as a printed matter, it will be considerably bulky. There is a problem in portability and handling. In addition, recently, there is a problem in producing such a large amount of printed matter in terms of global resource protection and global environment protection, such as the desertification of the earth and abnormal weather due to excessive logging of forests as paper resources. .

On the other hand, in a photograph such as a microfilm, even a small character can obtain clearer one, but such a photographic print has a problem that the cost is too high. In view of such circumstances, the present invention is a high-density mini-printer in which full-color, clear small letters and patterns (including photo copying) are printed even when enlarged, and a large amount of information is offset printed in a small space. It is intended to provide printed matter.

[0012]

In order to achieve such an object, the high-density mini-printed material according to the present invention separates an original into four colors of indigo, red, yellow and corner by an electronic plate making machine, A plate-making process in which halftone dots are inserted by a dot generator to create halftone positive films for each color.
A high-density mini-printed product obtained by offset printing, which comprises a printing plate process of printing on an S plate and a printing process of transferring the pattern of the printing plate obtained in the printing plate onto a predetermined paper. Printing was performed by using dampening water set to 40 to 45 dynes / cm.

In the above structure, the mini printed matter is
A device that is smaller than the size of a telephone card or business card. Further, the printed matter may be a card-shaped one or a bound one. The type of printing paper is not particularly limited, and it is possible to print not only on paper but also on resin sheets such as polycarbonate, polyvinyl chloride and polyester.

The size of characters is not particularly limited,
The size is preferably 0.6 mm square or less, and particularly preferably 0.4 mm square or less and 0.2 mm square or more. The number of halftone dots is not particularly limited, but is 2 per square inch.
More than 50,000 (500 lines), preferably 49000
It is preferable that the number is 0 (700 lines) or more.

The pH of the dampening water is not particularly limited, but nitric acid and nitrates such as ammonium nitrate, phosphoric acid and salts thereof are used, for example. Also,
The adjustment of the surface tension is not particularly limited, but in order to increase the surface tension, a nonionic surfactant or the like is added or water is added, and in order to reduce the surface tension, the above-mentioned pH adjusting agent is used. The method of adding is mentioned.

In addition, it is preferable to employ an ink used in the printing step that has a stickiness and hardness as compared with the ink used in the conventional printing. The ink is slightly different depending on the color of the ink, but compared with general ink used for printing about 300 lines or less,
It is preferable to use one having a large tack value of about 10% and a hardness of about 35 to 80%.

The net positive film is negatively exposed,
After that, either the method of reversing this negative to obtain a positive or the method of obtaining it by a direct positive may be used.
Negative up to line 00 is reversed and then reversed to positive. Further, in the offset printing method according to the present invention, in the plate making process, the standard highlight setup position is set so that the halftone dots of the ratio Y ₁ (%) obtained by the following formula (1) are entered, and the standard shadow setup It is preferable to set so that the halftone dots of the ratio Y ₂ (%) obtained by the following formula (2) enter the position.

Y ₁ = 0.01X ± 2 (1) Y ₂ = -0.0125X + 93.75 ± 2.5 (2) [In the formulas (1) and (2), X is a screen. The number of lines. ]

[0019]

According to the above construction, it is possible to surely obtain a fine printed matter which does not cause crushing or bleeding of characters.
That is, when the pH of the dampening water is below 4, ink thirst is poor and the halftone dots are crushed, and when the pH is above 7, blurring of printing occurs.

When the surface tension is less than 40 dynes / cm, the thickness of the dampening water layer becomes smaller than that of the ink layer, so that the ink flows into the dampening water layer side and print stains easily occur. Become. On the other hand, if it exceeds 45 dynes / cm, the thickness of the dampening water layer becomes thicker than the thickness of the ink layer, so that it becomes difficult for the ink to adhere to the side of the blanket cylinder, and there is a risk that fading occurs in printing.

[0021]

EXAMPLES The present invention will be described in detail below with reference to its examples. (Example 1) An indigo (cyan), a red (magenta), and a yellow (yellow) of a color original by an electronic plate making machine (scanner)
The color was separated into four colors, black and black, and halftone dots were added for each color using a dot generator (halftone dot generator) to produce a 500-line halftone positive film of each color. The setup value of the shadow portion of the positive film was 85%, and the setup value of the highlight portion was 5%. The net positive film obtained in this plate-making process was overlaid on a PS plate, exposed to light until the third stage of a Fuji Film step tablet became clear, and plate-made.

Then, the plate-made PS plate was printed on a printing machine and then printed to obtain a stamp-sized catalog 1 having 20 pages as shown in FIG. The amount of information was the same as that of a conventional printed A4 size catalog. In this catalog, characters with a minimum of 0.2 mm square were printed, but when viewed with a magnifying glass, everything could be read clearly. Moreover, the design was clear and had no bleeding.

Although this catalog has 20 pages, it is very compact. Therefore, when it was packed in a container for storing 100 business cards, 270 copies could be packed and it was easy to carry. The ink used for printing had a tack value and hardness of 12.9 and 576 for indigo, 12.0 and 291 for crimson, 11.3 and 291 for yellow, and 11.8 and 351 for black. . The fountain solution had a pH of 5 and a surface tension of 44.5 dynes / cm.

(Embodiment 2) A color original is color-separated into four colors of indigo (cyan), red (magenta), yellow (yellow) and violet (ink) by an electronic plate making machine (scanner), and a dot generator (halftone dot) is used. Put a halftone dot for each color in the generator),
A 1000-line net positive film of each color was prepared. The setup value of the shadow portion of the positive film was 83%, and the setup value of the highlight portion was 7%. The net positive film obtained in this process was overlaid on a PS plate, exposed to light until the first stage of a Fuji Film step tablet became clear to make a plate.

Next, the plate-made PS plate is printed on a printing machine to print 0.2 mm square characters 22 as shown in FIG.
A telephone card-sized card 2 printed with Hyakunin Isshu
Got This card 2 has a gradation, and the color of the letters 22 has changed gradually.
All characters 22 were clearly read when enlarged with.
Of course, the pattern printed together was clear without blurring.

The ink used for printing has a standard value at a temperature of about 20 ° C. and a humidity of 60 to 65%, a tack value and a hardness of 12.9 and 576 for deep blue and 1 for red.
2.0 and 291, yellow 11.3 and 291, black 1
It was 1.8 and 351. The pH of the dampening water was 6, and the surface tension was 42 dynes / cm.

(Embodiment 3) A color original is separated into four colors of indigo (cyan), red (magenta), yellow (yellow) and violet (ink) by an electronic plate making machine (scanner), and a dot generator (halftone dot) is used. Put a halftone dot for each color in the generator),
A 1500-line net positive film of each color was produced. The setup value of the shadow portion of the positive film was 77%, and the setup value of the highlight portion was 14%. The net positive film obtained in this plate-making process was overlaid on a PS plate, exposed to light until the first stage of a Fuji Film step tablet became clear, and plate-made.

Next, the plate-made PS plate was printed by a printing machine to obtain a tag 3 having a size of 3 cm × 4 cm as shown in FIG. This tag 3 is on the front cover 31
And a product description catalog 33 folded between the back cover 32 and the back cover 32. The ink used for printing had a tack value and hardness of 12.9 and 576 for indigo, 12.0 and 291 for crimson, 11.3 and 291 for yellow, and 11.8 and 351 for black. . The pH of the dampening water was 6, and the surface tension was 42.4 dynes / cm.

If this tag 3 is attached to a product in the same manner as a conventional tag, it becomes a catalog of various products of the company and is very convenient. (Example 4) Printing was carried out in the same manner as in Example 1 except that a 700-line net positive film was prepared with a setup value of the shadow portion set to 84% and a setup value of the highlight portion set to 6%. A printed matter 4 was obtained in which 262 characters of Hannya Sutra were printed with ruby on a stamp-sized sheet as shown.

Although a minimum of 0.2 mm square color characters were printed on the printed matter 4, when viewed with the magnifying glass 41, all the characters 42 were clearly read. Moreover, the design was clear and had no bleeding. (Example 5) A stamp size catalog as shown in FIG. 1 was printed in the same manner as in Example 1 except that the setup value of the shadow portion was 75% and the setup value of the highlight portion was 15%. Got 1.

In this catalog, characters with a minimum of 0.2 mm square were printed, but when viewed with a magnifying glass, everything was clearly read. Moreover, the design was clear and had no bleeding. (Example 6) As the ink, those having tack values and hardness of 12.6 and 320 for indigo, 11.8 and 350 for crimson, 10.2 and 214 for yellow, and 11.8 and 224 for black are used. Printing is performed in the same manner as in Example 1 except that
A stamp-sized catalog 1 as shown in FIG.

In this catalog, characters with a minimum of 0.2 mm square were printed, but when viewed with a magnifying glass, everything was clearly read. Moreover, the design was clear and there was no bleeding. (Comparative Example 1) A catalog similar to that of Example 1 was obtained, except that the pH of the dampening water was set to 7.5.
There was bleeding, and even with a magnifying glass, characters less than 1.0 mm square could not be clearly read.

Comparative Example 2 A card print was obtained in the same manner as in Example 1 except that the pH of the dampening water was 3.5.
The obtained card print had bleeding and crushed characters. (Comparative Example 3) A card print was obtained in the same manner as in Example 2 except that the surface tension of the dampening water was set to 39 dynes / cm.
The obtained card print had bleeding and crushed characters. (Comparative Example 4) A card print was obtained in the same manner as in Example 2 except that the surface tension of the dampening water was 47 dynes / cm.
The obtained card print had bleeding and crushed characters. The printed matter according to the present invention is not limited to the above embodiment. For example, in the above-mentioned embodiment, the card 100 is printed with the Hyakunin Isshu, but various information necessary for business and the like may be printed. If you have several cards of this kind, even if the other party suddenly asks a question, you can give an answer immediately, which is very convenient. Moreover, it is not bulky and lightweight, and easily fits in the pocket of the jacket, etc., so it does not interfere with carrying. In addition, printed materials such as art books, pictorial records, photo books, maps, etc., which require sharpness, can be provided in a small size.

Further, for example, a printed matter in which a large amount of information is densely printed with small characters on an A4 size paper and the printed matter is folded into a small size can be carried compactly.

[0035]

Since the high-density mini-printed matter according to the present invention is constructed as described above, it can be provided in large quantities at low cost by the offset printing method, and even if the size is smaller than the size of a card, it is several times larger than the conventional one. It is possible to provide an information amount that is several tens of times greater.

That is, it is convenient to carry and it is possible to provide a large amount of information at a time even if it is small. Moreover, even if the size is extremely small, all information such as figures, photocopies, maps, graphs, etc. and characters are clearly printed, and can be accurately read.

Also, the amount of paper and ink used, such as paper, is very small, and the wood resources that are the raw materials for paper are reduced.
In other words, it has a great effect on the protection of natural resources and the protection of the global environment.

[Brief description of drawings]

FIG. 1 is a perspective view of a stamp-sized catalog that is an embodiment of a high-density mini printed matter according to the present invention.

FIG. 2 is a partially enlarged plan view of a card on which is printed the Hyakunin Isshu, which is another embodiment of the high-density mini printed matter according to the present invention.

FIG. 3 is a perspective view of a tack which is another embodiment of the high density mini printed matter according to the present invention.

FIG. 4 is a partially enlarged plan view of another embodiment of the high-density mini-printed matter according to the present invention, in which a stamp-sized sheet of paper is printed with Hannya Sutra.

[Explanation of symbols] 1 Catalog (printed matter) 2 Card (printed matter) 3 Tack (printed matter) 4 Printed matter

Claims (4)

[Claims] 1. A plate-making process in which an original is color-separated into four colors of indigo, red, yellow, and corner by an electronic plate-making machine, and halftone dots are added by a dot generator to make a halftone-positive film for each color. In a high-density mini-printed product obtained by offset printing, which comprises a printing plate process of printing a PS plate on a PS plate, and a printing process of transferring the pattern of the printing plate obtained in the printing plate onto a predetermined paper, pH 4 to 7 in the printing process, surface A high-density mini-printed material, characterized in that it is printed using a fountain solution having a tension of 40 to 45 dynes / cm. 2. The high-density mini-printed product according to claim 1, wherein an ink that is relatively viscous and harder than the ordinary printing ink having 300 lines or less is used in the printing process. 3. The number of halftone dots is 500 or more.
Alternatively, the high-density mini printed matter according to claim 2. 4. The high-density mini-printed product according to claim 1, wherein characters of 0.6 mm square or less are printed.