KR800001433B1 - Net-printing method - Google Patents

Abstract

Screen printing of which the density boundary is similiar to real picture, comprises in more than 2 steps.(1) Total printing of which a beta density is applied from middle to high light part (half-tone density is lower than 50%) (2) Light-printing only the rest part having high half-tone density(Higher than 50%).

Description

Network printing method

1 is a graph showing the concentration of the dot density (%) of the printed matter printed by the embodiment of the present invention.

FIG. 2 is a graph showing the density of printed matter printed by the second edition after the dot density (%).

TECHNICAL FIELD The present invention relates to a network printing method, and the printing result has a density range roughly the same as a photograph, and relates to a method that can be carried out simply and economically without requiring skill.

Conventionally, the conventional printing method of varying the concentration by the size of the dot is generally used as the net printing method. However, this conventional method expresses a state (a state of a machine or a process of work). Near the minimum and maximum points are often neglected due to film and printing techniques, and the flats are used for highlights (shadow dots) and shadows (shadow dots) of printed matters. There is a drawback that the density cannot be increased to the level of photography.

In order to improve this, the duerteron method (double terrane method) was developed. The duerteron method is a method of changing the halftone angle and expressing the state so as not to moiré, but in this case, the highlight portion of the printed matter must be represented, but the shadow portion which occupies the light density region is improved. There is a lack of concentration gradation and it is impossible to express the state sufficiently.

There is also a method of compensating color density by superimposing thin plates (보 色 版). Even with this method, the state of color is slightly corrected, but there is a lack of density gradation to express the shadow of printed matter, and it is not enough to express the state.

It is often difficult to express the state in combination with such a thin color because it is very difficult to predict the state of the finish in advance, so it is often done at the stage of test printing, and any number of halftone dots without moiré are obtained. At the same time, due to the difficulty of the work and the complexity of the work process, it is necessary to be technically skilled, require a long time work, and require a great deal of materials.

Widening the density range and expressing shadows on printed matter occupying the light concentration range may be possible by increasing the thickness of the ink film, but the general behavior of the printing ink, which is a kind of fluid As the thickness of the ink film, i.e., the concentration of the bettor, is reduced, the speci? City of the dots generated by the transfer of ink decreases over the entire surface. The size tends to be thick throughout. Therefore, if the net concentration is decreased by decreasing the concentration of the bettor, the total concentration becomes thinner and the state becomes weaker. When the initial concentration is increased, the total density becomes stronger and the state of the net becomes thicker. Or crushed, resulting in smudges, loss of state reproducibility, and overall darkness.

The state reproducibility at each percentage point of the halftone density depends on the ink film thickness, or the beaker concentration, and the reproduction of the entire state is governed by the accuracy of the reproducibility of each halftone. That is, the state reproducibility of the printed matter is due to the accuracy of the reproducibility of the size of the halftone and the thickness of the ink film which is transferred and climbed on the halftone.

This is true not only for monochrome but also for color processes.

The present invention provides a network printing method that can extend the concentration range to such a conventional printed matter, and provide a printed matter such as a photograph and roughly. In addition, it also provides a network printing method that can be easily printed.

Therefore, the net printing method of the present invention is a process of printing as a whole a well-reproduced beta concentration from the middle part to the roll in a printed matter, and only a high portion of the dot density of the printed matter is made thin. It is characterized in that it comprises one or more steps of printing in the edition (version) expressed.

According to the network printing method according to the present invention, the density gradation over the roster can be faithfully expressed in the middle part, which can be expressed by a conventional plate manufactured by closely printing a man hanger film prepared as a transmission or reflection document. In order to overprint the high part of the halftone density, which is the relief of the state, with a thinly-printed plate, the halftone is not broken down from the middle to the roll. It is possible to correct the density gradation of only the high part.

This correction printing uses a plate that shows only a high portion of the density of dots in thinness, that is, a plate having a reduced area of halftone compared to a plate that is printed as a whole. In addition, printing can be performed without generating moiré by only a simple operation of aligning a cross mark. Therefore, in order to prevent the generation of moire, it has the advantage that a good printed matter is obtained without changing the halftone angle and printing.

The present invention will be described in more detail.

First, in the present invention, in the first printing step, the roster, that is, the portion having a halftone density of less than 50% from the intermediate portion, is printed at a beta concentration where a printed matter as close as possible to the theoretical value of the concentration curve is obtained. At this time, as for the plate (first plate) used, the halftone of 10% or less of a part disappears normally, and the halftone of 90% or more of a part should not be buried, and what is faithfully reproduced is used.

Preferably, the printing is performed such that a portion having a halftone density of 80% or less is faithfully reproduced.

These techniques are conventionally established and may be performed by a conventional method.

When the screen player is relatively stationary, if it is desired to sharpen from the middle part to the dark part, it is allowed to admit that the halftone up to + 20% is thick.

The second printing process prints using a second plate expressing only a portion having a halftone density of 50% or more, preferably a portion having a high dot density of 70% or more, more preferably 90% or more. If it is a part of 50% or more of such halftone density, the board which expressed the halftone density above any point as a starting point may be sufficient.

In the second printing process, when printing is overlaid on a printing plate expressing only 70% or more of the portions, a sharp printed matter can be printed. In the printing plate expressing only 90% or more of the portions, the density range is maintained until it becomes the same as the photograph. You can zoom in.

In the second printing step, the printed dot is slightly smaller in the surrogate portion than the dotted dot in the first step (slightly expressed), so that a short circuit of the concentration curve is not recognized. In addition, ink density can be kept constant so that printing can be performed.

This second printing process may be one or more times. For example, when two second printing processes are used, the second printing of the second printing process has only a portion higher than the halftone density expressed in the first printing. Print using a thin plate. For example, when the 1st printing in a 2nd process prints 70% or more of dot density, the 2nd printing can be performed from 80% or more as a starting point. If 90% or more is set as a starting point, printing can be performed starting from 95% or more.

Thus, when two or more 2nd printing processes are used, it is more powerful and the printing of the density range like a photograph can be obtained.

As described above, the second printing step does not necessarily need to be used for two or more. For example, when the first printing step yields a bettor concentration of 1.5 or more, and in the second printing step, the second beter concentration yields more than one, the second printing step is performed. When two or more printing processes are used, very good printed matter can be obtained.

寫眞)의 농도곡선보다는 이론값에 가까운 것이 얻어진다.In this case, in the second printing step, using a printing plate expressing thin dots in only 80% or more, raising the beta concentration, and using the second printing step in two or more parts in the most concentrated part. If you get closer to the density of paper printing photos (紙)

The theoretical value is obtained rather than the concentration curve of i).

In this way, whether to use a plate expressed based on the number of second printing steps, the beta concentration, and the percentage of halftone density as a starting point is determined by the nature and use of the printed matter, which is basically limited in the present invention. It doesn't work.

For example, considering the difficulty of trapping and backside printing in printing, a method in which a second printing process is not used in combination of two or more in a multicolor machine or a wave offset machine is also an effort. It is a preferred embodiment in terms of saving energy, speeding up the manufacturing process, and saving material costs and manufacturing costs.

In addition, the order of a 1st printing process and a 2nd printing process is arbitrary.

The net printing method according to the present invention can be applied not only to offset printing but also to various net printing such as iron plate printing, gravure printing, and the like. It can be used as a real photograph, and for example, it can be used as an electronic board, which was not available in a conventional printed matter.

According to the present invention, the entire state of the printed matter can be expressed up to the darkest part without breaking down, the density range is expanded, and the original paper reaches the density of the printed photograph (reflected document), sometimes the original positive. It can reach or exceed the maximum concentration of the film.

That is, each bettor concentration ranges from 1.30 to 1.65 in yellow, 2.05 to 2.17 in magenta, 2.05 to 2.17 in cyan, and 2.10 to 2.30 in black, and reaches a total of 2.30, sometimes exceeding, which is measured by permeation concentration. It can also reach the maximum concentration of the original positive film, sometimes exceeding it, and exceed the maximum concentration of the original paper printing photograph.

In the second printing step, the concentration of moiré-producing sites is very low, and the dot area is smaller than that of the corresponding part in the first printing step. Does not cause The moire cannot be seen at all in the portion of the dot density of 90% or more in the first printing step.

According to the present invention, it is possible to change the density curve of the state to be reproduced almost freely and obtain a printed matter as desired.

[Yes]

The printed matter was produced by the method of the present invention, and the concentration to the dot density was measured. The chain was prepared using a screen of 150 / 2.54 cm. The results are shown in the following table.

In the table, A represents a printed matter in the case of printing by the first printing process, and B, C, D represents a printed matter in the case of printing to the second printing process.

For example, the expression A + B denotes a printed matter obtained by superimposing B on A. The same applies to A + C, A + B + C, A + C + D and B + C.

If this is shown on a graph, it will become like FIG.

의 부위는 인쇄물의 중간부를 나타내는 것이지만 A+C+D는 종래의 것에 비해서, 중간부에 있어서의 굵어진 정도가 적으며, 양호하게 인쇄되어 있다는 것을 알 수 있다.When the method of the present invention is used, the concentration range is enlarged as compared with the conventional one, and the concentration curve is similar to the shape of the theoretical concentration curve of the positive film, and it can be seen that the reproducibility is better than the conventional one. In the graph

The portion of denotes the middle portion of the printed matter, but A + C + D has less thickness in the middle portion than the conventional one, and it can be seen that it is printed satisfactorily.

2 is a concentration curve of a printed matter produced by printing only the second process of the present invention. According to this, it turns out that B is printed using 3%, C 80%, and D 95% as a starting point.

Claims (1)

As shown in the drawings and described above in the main text, the process of printing as a whole with a concentration of a bettor that can be satisfactorily reproduced from a middle part to a roll in a printed matter, and only a high portion of the dot density of the printed matter is next. A network printing method comprising at least one step of printing on a thin plate.

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