A method of obtaining a multi-color reproduction

 

(57) Abstract:

Use: in the manufacture of multi-color printing reproductions. The essence of the invention: a method of obtaining a multi-color reproduction, which consists in the successive coating the surface of printing material layers of paint in various colors, carrying a monochrome bitmap images with different frequency, realize that on the surface of printing material is applied colorful layers of different colors, each of which carries a monochrome bitmap with the frequency determined by the dependencies listed in the description. 1 Il.

The invention relates to printing processes and can be used in the manufacture of multi-color printing of reproductions.

A method of obtaining multi-color reproduction, which consists in the successive coating the surface of printing material layers of paint in various colors, carrying a monochrome bitmap with the same frequency. The main disadvantage of this method is the occurrence of the moire phenomenon when applied to each other monochrome bitmap images Odincovo).

The closest technical solution to the present invention is a method of obtaining a multi-color image, which consists in the successive coating the surface of printing material layers of paint of different colors, and monochromatic image of each color has its own frequency (see kN. Modern printing abroad. Reproduction processes. Edited by Prof. Suslova B. A. M. Book, 1987, S. 103).

The main disadvantage of this method is that the determination of the desired screen frequency for each monochromatic image is carried out empirically, that is rather time-consuming operation.

The method of determining the line-screen monochrome images is further complicated due to the fact that each colorful triad and grades of paper it should be done again. In addition, he, like any empirical method, inaccurate, and therefore, has a low reproducibility of the results. All this leads to lower quality multi-color reproduction.

The aim of the invention is to improve the quality of multi-color reproduction. This objective is achieved in that a method of obtaining material layers of paint of different colors, each of which carries a monochrome bitmap with the frequency determined from the expression

0,0007 where the distance between the centers of the printing raster elements;

b the distance from the observer's eye to the image;

bthe reflectance of the paper;

tothe reflectance of the paint.

We conducted a patent search revealed no method of obtaining multi-color reproduction with these distinctive features and why they are significant.

The essence of the method lies in the fact that to determine the screen frequency for monochromatic image of each color using the dependence of

0,0007 (1)

This formula is more common case is known (see Bruises N. And. Manufacturing technology photomechanical printing plates, M. the Book of 1974, S. 79) mathematical expressions

0,0007 (2) where the distance between the centers of the printing raster elements;

b the distance from the observer's eye to the image.

The normal distance vision is 250-300 mm When a=250x x0,007= 0,175 mm Last shows what should be the distance between the centers of adjacent raster (mnye studies show what is the distance between the raster elements will depend on the magnitude of the reflection coefficient of the dye, which is reproduced monochrome bitmap. The results allowed us to propose the dependence (1) as the formula for determining screen frequency for any paint.

The formula shows that the more different the reflectance of the paint from the reflection coefficient of the drawing paper, the higher frequency it is necessary to reproduce the image of this paint and Vice versa.

If in the formula (1) reflectance of paper to take per unit (a perfectly reflective paper), and the reflectance of the paint to be mistaken for the zero (completely black paint), the dependence (1) is transformed into the dependence (2). This suggests that the dependence (2) is a special case of formula (1).

The drawing shows the curves reflect blue (1) purple (2) yellow (3) black (4) paints and drawing paper (5).

P R I m m e R. First, the photometer FM-58 measured reflection coefficients of the drawing paper and dice printed on drawing paper cyan, Magenta, yellow and black colors. The thickness of the paint layer on each of the paint chosen is fficientow reflect these dice (see the drawing). Then on the measured values of the reflection coefficients using the dependence (1) determine the required frequency for each ink. It should be noted that the measurements are carried out relative to the drawing paper, i.e., below the left window photometer FM-58 instead of the standard white standard set of drawing paper. In the example used Finnish coated paper "Cubelet" weight 120 g/m2and paint series 2527. The measured reflection coefficients have the following values:b0,92;W0,51; p=0,42;g0,36;h0,14. Definition of line screens carry out the dependencies

0,0007

For yellow paint

0,0007

a 0,007 250 2,24=0,381 mm

Knowing the value and determine the l-line screen for yellow paint using the well-known equality a

l 26,24 l/cm

For purple paint

0,0007

a 0,0007 250 1,84=0,322 mm

Knowing the value and determine l the frequency for Magenta

l 31 l/cm

For the blue paint

0,0007

a 0,0007 250 1,58=0,278

Knowing the value and determine l the frequency for the blue paint

l 36 l/cm

For black paint

0,0007

a 0,0007 250 1,18 0,207

Knowing the value, and determine l the frequency for black xperiment with 30 observers. They were given scales yellow, Magenta, cyan and black inks, made certain by the proposed method with line screens of 91.5% of the observers were registered, which is the normal distance vision (250 mm) scale all colors, made with the specified line are perceived as tone. This can be explained by the fact that, the smaller the contrast between the paper and ink (see the drawing), the rougher the frequency valid.

After determining the line screens for each color synthesis is made separated svecokarelian photo forms for each ink with his ruling and accepted by the angle of rotation of the raster, for example, on Zitadelle zvetokorrekcia DS-350. Then make color-separation printing plates.

Setting the printing form to the appropriate multi-color printing unit of the printing machine, for example, for offset printing, perform the printing multi-color reproduction.

The proposed solution allows to improve the quality of multi-color reproduction, compared with the prototype due to objective and more precise definition screen frequency for each color on the dependencies.

The WAY of GAINING the material layers of paint of different colors, bearing monochromatic images with different frequency, characterized in that, with the aim of improving the quality of reproduction, the frequency for each monochromatic image choose from

< / BR>
where a pitch;

b the distance from the observer's eye to the image;

bthe reflectance of the printed material;

tothe reflection coefficient of the corresponding colors.

 

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