RU2143342C1 - Method of forming color iris-effect printing pattern with complete circular coverage - Google Patents

Abstract

FIELD: polygraphy, in particular, printing of securities, such as banknotes and other color printed product. SUBSTANCE: method involves applying basic structural pattern component in the form of continuously colored line with gradually changing colors; introducing zone of gradually changing colors from one color portion to other color portion so as to form iris pattern with complete circular coverage. It is supposed that length of zone of gradual changing of colors in continuously colored line is within the range of at least 1-25 mm. Gradual color changing zones have variable length and width values. Fragments composed within one basic layer of at least three different optical densities may be introduced into pattern. EFFECT: wider range of products with color patterns and improved protective properties of pattern. 4 cl, 4 dwg

Description

 The invention relates to printing, and in particular to a printing method known as "Oryol printing" (1), and can be used in printing securities, in particular banknotes, as well as in printing of various other multi-color printed products.

 As you know, the method of Oryol multi-color printing is based on rolling up a prefabricated printing form using colorful patterns (2). The prefabricated plate and colorful templates are mounted respectively on the plate cylinder and on the template rollers. Thus, the essence of this print consists in the formation of individual colorful layers on color-separated forms, their transfer to the prefabricated form and from here to the perceiving surface.

 A multi-color Oryol image is formed by creating a continuously colored line with a transition of colors. Here, by the transition of colors of such a line, we mean the coloring of its various sections in the corresponding colors. Moreover, the boundary of the transition of the line section of one color to the line section of another color is characterized by the absence of mixing zones for these inks in the indirect Oryol press and the presence of a minimal zone for mixing inks in direct Oryol printing. Thus, all colorful patterns, when applied to a prefabricated printing plate, completely cover the entire area of the pictorial field of the prefabricated form without imposing various separate colorful areas from each other (3).

 As the closest analogue, the method of forming a multi-color background pattern in Oryol printing was adopted, disclosed in patent SU N 1743341, class B 41 F 11/00 (publication 23.06.92), owned by the Swiss company "De La Ru Jiori S.A." .

 The basic method of Oryol multi-color printing is characterized by the use of colorful templates, which are dies of various configurations, as well as the absence of overlapping zones that transmit paint to the surface of the templates on a prefabricated form.

 The main disadvantage of the existing method of forming a multi-color background pattern in Oryol printing is the absence of a mixing zone between two sections of different colors of paint.

 The absence of a mixing zone of two colors in indirect Oryol printing and the small length of this zone (insufficient to produce mixed ink) in direct Oryol printing do not allow increasing the color gamut and the color of the most continuously painted line and, accordingly, the Oryol drawing itself.

 The objective of the proposed invention is to improve product quality, namely, the colorfulness and color scheme of the painted line, and, therefore, increase the security of valuable documents.

 This problem is solved in the proposed method of forming a multi-color drawing of the Oryol print, including applying the main structural component of the drawing in the form of a continuously colored line with a color transition, while according to the invention, a zone of a smooth transition of colors from one colorful section to another colorful section with the formation in the figure of the iris effect within the full coverage of the directions of orientation around the circle.

 Preferably, the length of the zone of a smooth transition of colors in a continuously colored line is not limited and ranges from 1 to 25 mm and above.

 Mostly the zones of smooth transition of colors can vary in length and width in a wide range of values.

 Also, fragments composed of various optical densities - at least three - within the same basic layer can be included in the above figure.

 The technical result that can be obtained by using the invention is to create new artistic and technological possibilities for constructing the most colorful Oryol drawing. Iris transition zones of paints increase the overall brilliance of the picture due to the additional color and due to color shades without limiting their orientation around the circumference and length of such zones.

 In the complex, a multi-color Oryol pattern with an iris effect has higher protective properties, including the exclusion of the reproduction of this pattern on color copying machines, which is crucial in the production of securities (banknotes).

 In FIG. Figure 1a shows the formation of a continuously colored line in direct Oryol printing.

 In FIG. 1b shows a clear boundary between the blue line sections and the yellow line sections in indirect Oryol printing.

 In FIG. Figure 2 shows the mixing zone between the primary colors: yellow paint and blue paint.

 In FIG. Figure 3 shows the zone of a smooth transition of paints from red to blue with the formation of an additional color.

 In FIG. 4 shows areas of blue paint that allow one to form fragments within the limits of a monochromatic Oryol pattern.

 Below with reference to the figures of the drawings shows examples of the method. The subject of the invention is a method for forming a multi-color Oryol pattern with an iris effect within full circumference. For a clearer picture of the essence of the proposed method, the following are the features of the existing options for forming a picture of the Oryol press.

 The continuously colored line (Fig. 1a) in the currently used direct Oryol printing method contains a portion 1 corresponding to yellow and a portion 2 to blue. Between these sections on the line there is a mixing zone of two colors 3, in this case green. The length of the mixing zone of two colors on the line lies in the range of values of the order of 0.6-1.2 mm.

 The formation of a continuously colored line in indirect Oryol printing is characterized by the absence of a mixing zone between two sections of different colors of paint. In FIG. 1b shows a clear boundary between the sections of the blue line 2 and the sections of the yellow line 1.

 The absence of a mixing zone of two colors in the indirect Oryol printing and the small length of this zone in the direct Oryol printing do not allow increasing the color gamut and the color of the most continuously painted line and, accordingly, the Oryol drawing.

 Iris (rainbow) printing (4), which is also currently used, makes it possible to obtain a smooth transition zone in color between two primary colors in a multi-color drawing. The width of this smooth zone ranges from 4 to 6 mm. In FIG. 2 shows the mixing zone between the primary colors: 1 - yellow paint and 2 - blue paint. This zone 3 is characterized by a smooth transition of color from yellow-blue 3a to green 3b and blue-yellow 3b colors. At the same time, the overall colorfulness of the pattern increases due to the formation of an additional green color from mixing paints.

 However, the iris effect occurs only with the strict orientation of the multi-color pattern relative to the direction of the axis of the printing cylinder of the printing press. This direction corresponds to the perpendicular arrangement of the figure (see figure 2).

 Another feature of iris printing is the constant value of the width of the ink mixing zone 3. The optical density of the sections of the multi-color image 1, 2, and 3, determined by the thickness of the ink layer, also has a constant value.

 According to the proposed invention, in the structural component of the drawing of the Oryol press - a continuously colored line - a zone of a smooth transition of color from one colorful area to another colorful area is introduced. In this case, in contrast to the known method of iris printing, the iris effect in the figure is formed within the full coverage of the directions of orientation around the circle. Thus, this zone of a smooth transition of inks in a continuously colored line now does not depend on its orientation relative to the axis of the printing cylinder of the printing press.

 The zone of a smooth transition of colors is characterized by the formation of additional color. Moreover, the length of this zone is not limited and can range from 1 to 25 mm and above.

 In FIG. Figure 3 shows the zone of smooth transition of paints from red 2 to blue 1 colors with the formation of an additional color 4. This zone of transition of paints is reproduced within the full range of coverage from 0 to 360 degrees.

 As can be seen from the smooth transition zone of paints 5, the length of this zone can vary over a wide range, including continuous, in the multi-color Oryol pattern.

 And finally, the multi-color drawing of the Oryol print has sections with at least three different optical densities within the same ink. To create three optical densities within one of the main colors of a continuously colored line, a continuous or stepwise raster scale decreasing in area of filling can be used, which increases the boundary zone of the colorful template. The linear dimensions and gradation characteristics of which determine the length of the zone and the smooth transition of the colors. To obtain three optical densities, the raster scale can be performed, for example, with an area of filling the fields of the raster cell - 10, 40 and 80%. In more detail, the technical reproduction of the picture in various methods of Oryol printing is implemented according to the parallel application "The method of Oryol indirect or direct multi-color printing with iris effect within the full coverage of the circumference".

 In FIG. Figure 4 shows sections 1, 2, 3 of blue paint, allowing one to form fragments within a single-color Oryol pattern.

 The increase in the zone of a smooth transition of colors between different adjacent sections of the continuously painted Oryol line allows, in contrast to the traditional construction of such a line (Fig. 1), to create new artistic and technological possibilities for constructing the most colorful Oryol drawing. Iris transition zones of paints increase the overall brilliance of the picture due to the additional color and due to color shades without limiting their orientation around the circumference and length of such zones.

 These requirements are met by the possibility of introducing fragments composed of various optical densities within the same color into a multi-color Oryol pattern.

 In the complex, a multi-color Oryol pattern with an iris effect has higher protective properties, including the exclusion of the reproduction of this pattern on color copying machines, which is crucial in the production of securities (banknotes).

Sources of information:
1. Nemirovsky EL, "Oryol press". FLEXO Plus Magazine, 1998, N 2-4.

 2. Designs and calculation of printing machines. Book VI. Rotary printing machines. -M., 1954, p. 39-43.

 3. Nemirovsky E. Flexography in the palette of special printing methods. The magazine "Computer", 1999, N 3.

 4. Stefanov S. I. A guide in the world of printing. -M., IF "Uniserv", 1998, p.209.

Claims (4)

 1. A method of forming a multi-color drawing of the Oryol press, comprising applying the main structural component of the drawing in the form of a continuously colored line with a color transition, characterized in that a zone of a smooth transition of colors from one colorful section to another colorful section is introduced into the continuously colored line, with the formation in the drawing iris effect within the full coverage of the directions of orientation around the circle.  2. The method according to p. 1, characterized in that the length of the zone of a smooth transition of colors in a continuously colored line is selected in the range of values from 1 to 25 mm and above.  3. The method according to claim 1 or 2, characterized in that in the aforementioned figure, the zones of smooth transition of colors vary in length and width over a wide range of values.  4. The method according to claim 1, characterized in that the said figure includes fragments composed within at least three different optical densities within one main layer.

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