Method for spectral color control

FIELD: operative color control in printing presses for used primary and auxiliary colors by continuous conducting of spectral measurements in conjunction with linear equations for determining the required correction of printing ink feed for conservation of color precision in printing.

SUBSTANCE: when the color anomaly is exceeded, the measured values of the spectral reflectivity of the tested area are compared with the respective preset values, and the anomaly of the reflection spectrum is determined. The linear equations are used for correlation of the reflection spectrum anomalies with varieties of the solid ink density or thickness of the ink layer for ink feed control with the use of an operatively empitically produced corrective matrix, such that the reflection spectrum is minimized.

EFFECT: provided color control during printing with the use of spectral measurements.

65 cl, 4 dwg

 

The scope of the invention

The present invention relates to the operational control of the colors in printing machines used for the primary colors and non-core (PMS or special colors by continuously conducting spectral measurements in combination with the linear equations to determine the required correction ink for maintaining accurate color printing.

Prior art

The control accuracy of colour reproduction in printing machines requires that color deviations between the specified color and the corresponding test area in the subsequently printed sheets remained within the established color tolerances. In the case of the missing within the color tolerance adjustment roll the paint (painting) is performed using the adjustment solid ink density and the thickness of the layer of paint to reduce deviations of color so that color differences were within tolerance.

Usually in the printing process, the operator performs a visual inspection of the printed images and regulates the flow of ink onto the print to achieve a visual match. Trial print or pre-printed "Color OK", "Normal color") sheet is usually used as the benchmark. As each expert has different vision of color, both for the same ex who ERTA over time, and between different experts, this procedure is associated with a large scatter of results (many variations) and takes a long time. Instrumental color control is more repeatable, accurate and efficient.

In the printing industry densitometry is the primary method used to control the primary colors and their respective characteristics, in the process color printing. Although the densitometer suitable for measurements relating to the control of the relative intensity in the process of applying solid color film, the densitometer is not able to determine the color of an object in this way, as in visual perception. Control the colors used in a printing press, as one of the primary purposes include the preservation of visual control distribution between the specified color and the same distribution in printed sheets so that visually there is no disturbance of color in the course of the printing process. This requires measuring tool able to describe the color of an object in terms similar to the visual. Instruments that meet this requirement include colorimeters and spectrophotometers. Spectrophotometers, in addition, have the advantage that they can provide data in densitometric and colorimetric form, calculated in soo is according to standard procedures.

Measurement for color control is usually carried out using the color bands, which include different test items that provide information regarding the quality of printing. Although the color control based on measurements by the color bands, provides a high level of print quality, it is possible to achieve a high level of print quality measurements within the image. In such circumstances, the color control based on measurements within the image using the color bands and without, can provide the necessary level of print quality.

Control of any system requires knowledge of the relationships between input and output variables. In print, despite the large choice of input variables, the main controlled parameter print or output variable, affecting the appearance of the printed image, is the inking, which regulates the flow of ink to print. By varying the amount of ink for printing, it is possible to change the thickness of the layer of paint left on the paper, thus affecting color printing.

Although the reproduction of multicolor halftone image is essentially a nonlinear process, in certain conditions it is possible to use linear uravnenii the modeling process by restricting the transformation in one color. Within each sub-region for which the original variable takes the selected color may be used a number of "localized" equations. The area around which the localized transformation may be linear, depends on the location of a given color, the input and output variables used to display differences between test and specified areas in the transformation.

Methods of color control using the spectrophotometer described in U.S. Patent No. 4975862, 5182721 and 6041708. These patents, however, describe how control printing using the colorimetric coordinates obtained on the basis of the data of the reflectance spectrum, is preferable to using data directly reflectivity spectrum.

Some aspects of the above-mentioned patents can be improved through the use of color control. Colorimetric models provide less precise control than spectral model mainly in situations where the difference between the reflection spectra of the two installed (fixed, fixed) paints cannot be described by a single constant or multiplier. In addition, independent methods of calculating the parameters of the matrix ratio of solid ink density or differences in the thickness of the layer of paint to the disturbances eniam of the reflectance spectrum are not sufficiently accurate for use in industrial control systems color. Such methods represent the state of the system only at this time. Dynamic methods of calculation of the matrix online real-time during the printing process will significantly improve the efficiency and accuracy of the method of control.

Summary of the invention

The present invention provides a method of controlling color when printing via direct use of the information contained in the spectrum of reflection. Determined deviation between the spectra of reflection of the reference and test areas, which are used to calculate the required correction, solid ink density and the thickness of the layer of paint to use when running the printing presses. This method converts the deviation of the reflectance spectrum directly in the correction signal or solid ink density, or thickness of the layer of paint through the use of linear equations using the empirically obtained by the transformation matrix, which is based online. This method is applicable to the control used primary colors and non-core (PMS or special colors.

For a better understanding of the features and advantages of the present invention the following detailed description and drawings illustrating specific embodiments of the invention.

Description of the drawings

F. GA depicts a typical classification of test samples, forming a color scale;

fig.1b - alternative classification color scale;

figs - alternative classification color scale;

figure 2 - adjusting the color in the surrounding areas;

figure 3 diagram of the sequence control method of a color in accordance with the present invention;

figure 4 - graphical dependencies change negative capacity as a function of wavelength for the control of non-primary colors.

Detailed description

The present invention uses the color control information obtained from spectral measurements with or samples (plots) color bars, the area inside the printed image, or a combination of samples (sites) color bars and areas within the printed image.

Shown in figure 1 color control strip used in the control process consists of rows of test elements. The color stripe printed perpendicular to the printing direction, usually located or at the top or in the middle or at the bottom of the printed signature in the areas of edges or bend, as shown in figure 2. Test samples for measuring characteristics of the print quality is well known in the industry and described in the literature (for example, "Introduction to the color bands is: the user guide on the application of the color bars". The Association of Graphic Communications (Association for the Exchange of Graphical Information, Graphics Association), 1992).

Test samples of the color bars usually include flooded areas 1 (100% coverage area), areas 2 grayscale shades different coverage areas for each of the basic colors (black, blue, red and yellow) and sections 3 two - and three-color prints, basic chromatic colors (blue, red and yellow).

In situations such as print Newspapers, where there is no field edges, the color stripe is often located on the layout in such a way that does not cause inconvenience to the reader. On fig.1b and 1C, respectively, in such situations it is customary to print or single color strip, consisting of alternating three-color neutral sections 4 and black halftone sections 5 or two color bands, where one color band consists entirely of three-color neutral grayscale plots 4 and the other of the sections 5 black half-tone paint. Other options control the color bands. It should be noted that in the right conditions print tri-color neutral gray areas and black halftone areas presented on fig.1b and 1C should visually represent the same color and in velom shade. Differences in light shade in the drawings are only for explanation of the principle.

The print control in most printing machines is posando, where each zone corresponds to the width of, for example, 32 mm, as shown in figure 1. Within each zone 10 adjusting screw ink, controlled servo motor or similar means, automatic control system of the ink is used for adjusting the amount of ink supplied to the print area, which in turn will affect the color plots located within the special economic zone and, in varying degrees, neighboring (adjacent) areas in figure 2. Thus, the forward portions can be adjusted for obtaining the desired color. Therefore, for accurate color management, it is important to choose the test samples (sites) and/or image areas, which are very sensitive to changes in the essential characteristics of print quality and position control samples (plots) respectively across the color strip and/or areas of the image across the print area.

To determine the color of the test sample (plot) or the image area necessary measuring tool for determining the reflection of light from the measured area. Preferably, this tool has been spectrophotometer. Preference is sustained fashion and well-known method for capturing and analysis of light with the help of a spectrophotometer is the use of spectral grid and number of sensors (touch line) with computer processing. The output is the number of values of the reflectance spectrum, which describe the relative reflective characteristics of the object across the visible spectrum at a constant small wavelength interval. Reflection magnitude is obtained by calculating the reflectance spectrum, which represents the ratio of the amount of light reflected from the sample to the amount of light reflected from the sample material is illuminated in the same way, at each wavelength, around the likely range. The spectrophotometer has the additional advantage consists in the fact that the values of the spectral reflectance can be converted in colorimetric and densitometric representation in accordance with standard calculations. In this document, the term "density" is used for comparison with the densities calculated in accordance with standard practice, as documented, for example, in the American National Standard for Photography (SENSITOMETRY) (Photometry) - Density Measurements - Spectral Conditions (Modes) (Spectrometry). ANSI/ISO 5/3 - 1984, ANSI PH2.18 - 1985, new York: American national Standards Institute, 1985. The term "colorimetric" is used for comparison with the colorimetric coordinates calculated in accordance with standard practice, as in tveretina documented in GGATS.5 - 1993, Graphic technology - Spectral measurement and colorimetric computation for graphic images.

Methods of color control using measurements of solid (100% area coverage) samples (plots) are widely described in the literature. Although these methods are a means of direct control, solid ink density (SID) is the only variable that can be updated directly in real time, these methods have limitations due to a number of important properties related to image quality, such as increasing the value of the tone (dot gain) and capture the colors are not taken into account and affect the reproduction of the image in addition to changes in solid ink density. As a result of applying a color control based only on solid ink density, the appearance of the printed object may differ significantly from the established "Color Ok" (the"Regulations"color), although the density measurement of solid colors show differently. Thus, it is important to select samples (sites) and/or image areas that have the highest sensitivity to changes in significant quality characteristics of the print above, or are visually significant aspects of printing. Additionally, to reduce the number of color measurements required for the control, must be used a minimum number of lots.

According to the scheme shown in figure 3, in accordance with the present invention, the reflectance of the test sample (plot) or the image area is measured at step 100 using a spectrophotometer. The parameters of the reflectance spectrum is converted into color coordinates/color settings on the stage 102 in one of the proposed CIE uniform color space (CIELAB, CIELUV), which as the primary benefits have the ability to measure color parameters, close the visual. Colorimetric coordinates are calculated based on the parameters of the reflectance spectrum, in accordance with standard calculations, as described previously. The colorimetric coordinates of the test sample (plot) or areas of the image are compared at step 104 with the corresponding colorimetric coordinates of the set of samples (sites) and the field of images presented in the same color space, to obtain values of the differences of color options. Set of colorimetric values, which are calculated from the given values of the reflection spectrum can be obtained in various ways, including measurement using the original printed sheet, referred to as "Color Ok", "Normal color") sheet (sample). Otherwise the specified value can be is installed manually by the operator in various ways, including the use of hand-held spectrophotometer, or by automatic systems in preparation for production, or fortresse. Differences in color parameters can be used to calculate the total color deviation, using one of the well-known equations to calculate the deviations of color, such as ΔE*abthat ΔE*that ΔE*94etc. To determine whether to make adjustments in the ink of the color deviation of the parameters at step 106 is compared with the established color tolerances. Color tolerances for a given sample (plot) or areas of the image are set to print and may be based, for example, industrial standards or the specifics of printing equipment. If differences colorimetric parameters beyond color tolerances required correction. If correction is needed, the use of colorimetric coordinates of the impossible, and to calculate the required correction roll the paint (ink) used the information contained in the spectrum of reflection. This is done by comparing the values of the reflectance spectrum of the test area obtained at step 100, with the corresponding values of the reflectance spectrum to obtain the values of the variance of the reflectance spectrum at step 108. The deviation of the spectrum then the conversion is described directly in the correction solid ink density on the stage 110 using linear matrix equations.

where R is the vector of deviations of the reflectance spectrum, including deviations ΔRλ) of the reflectance spectrum, D is the vector of deviation or correction values solid ink density, which includes the calculated deviations of the densities of blue, red, and yellow paints, ΔDc ΔDm ΔDy, respectively, measured using filters of primary colors, J' - 3×m "corrective" matrix relating to stage 112 two vectors, where m is the number of intervals equal to the wavelength. Although most spectrophotometers describe about 31 the magnitude of the reflectance spectra for a description of the reflectance spectrum of the object, in many cases, the reflection spectrum can be represented with a smaller number of variables with a special selection of the wavelength-dependent spectrum or the estimated spectrum. To control chromatic monochrome flooded areas naturally interest will represent wavelengths in the areas with maximum absorption. Reducing the number of values of the reflectance spectrum used in the calculations, will increase the speed of calculation and reduce the number of measurements required to estimate the coefficients of the J matrix.

Using Equation 1, it is also possible to calculate corrections to the thickness of the layer of paint instead of the amended solid ink density directly from the variance of the reflectance spectrum. So the e conversion has special advantages for control of the main colors used, non-primary colors, based only on measurements within the image and in situations such as newspaper printing, where control measurements are only three-color neutral black and grayscale test plots. In figure 4 for the control of non-primary colors the advantage of this approach consists mainly in the fact that for many non-primary color region of maximum absorption are not well combined with the area of maximum transparency for filter Status T Status T) and Status E (Condition E), commonly used in the printing industry. The result of this lack is the densitometric value, which reduces the sensitivity to changes in the thickness of the layer of paint. In figure 4 it can be seen where blue, green and red Status T Status T) filters are applied together with the spectrum of the reflection minor paint.

Returning to the diagram in figure 3, the correction matrix at the stage 112 includes private differentiation of the dependent variables on the independent variables. The elements of the correction matrix are highly dependent on several factors, which include printing conditions (paint, paper, printing, and so on) and cover the area of the main colors. As a result of the adjustment matrix is required for each test area to negotiate the previously described situation. In addition, according the changes in the working conditions of printing during printing, which may affect the characteristics of the print, the transformation matrix is defined first, need clarification (update) to stabilize their conditions.

The adjustment matrix presented in Equation 1, establishes a relationship between the variance of the reflectance spectrum and the corresponding differences in solid ink density. The correction matrix can also be used to link the variance of the reflectance spectrum of differences in the thickness of the layer of paint. Members below the matrix of partial derivatives of the thickness of solid ink on spectral reflection.

Members of the matrix located in the first row, describe the rate of change of magnitude of the density of solid blue paint special test element for a single change of reflectance for a given wavelength. The remaining two rows describe the same relationship for the differences in the densities of red and yellow colors, respectively. One way of obtaining these members will be independent establishment of the density values of the solid colors of blue, red and yellow colors and the measurement of resulting changes in the values of the reflection spectrum. A limitation of this approach is that it will require making special changes in the density of the solid ink in the printing process, which can be what oracit changes required for printing at this point at the moment, thus reducing the efficiency of the control method. The proposed method, which bypasses this restriction defines the members of a correction matrix using the method of least squares. The identification of the members of the correction matrix using the least squares method is in accordance with Equation 2.

where X is the matrix n×m values of the independent variables, Y is n×3 - matrix of values of the dependent variables and n is the number of samples used in the definition. Members of the correction matrix can be determined from the quantities of solid ink density or thickness of the layer of paint and variance of the reflectance spectrum obtained during the preparation for printing. Thus, no additional changes to solid ink density or thickness of the layer of paint, and established members of the matrix can be calculated for any secondary effects that can occur when estimated simultaneously more than one color at a time.

The calculation of the members of the correction matrix using the least squares method is as shown in Equation 2, with deviations reflectance spectra as independent variables and the differences in solid ink density and the thickness of the layer is or ink into as dependent variables. Making calculated adjustments minimizes the specified color difference.

In the practical application of the invention may appear different implementation options. Thus, the following claims defines the scope of the invention, methods and structures within the framework of the claims, covering thus cash equivalents.

1. The control method of the printing sheet in the printing process, including the measurement of the parameters of the reflectance spectrum of the test area formed on the printing sheet, comparing the measured parameters of the reflectance spectrum with the given parameters of the reflectance spectrum to determine the magnitude of the deviation of the reflectance spectrum, converting the deflection of the reflectance spectrum directly in the correction and management of inking in a printing machine using the correction values.

2. The method according to claim 1, wherein prior to converting the deflection determine whether the deviation of the reflectance spectrum are within tolerance, and perform the conversion only if the deviation of the reflectance spectrum is outside the tolerance.

3. The method according to claim 1, characterized in that at the stage of conversion use linear equations to translate the values of the variance of the reflectance spectrum in the correction value.

4. SPO is about according to claim 3, characterized in that the phase transformation includes the operational construct and use the adjustment matrix for obtaining correction values.

5. The method according to claim 4, characterized in that the members of the correction matrix is obtained using the least squares method.

6. The method according to claim 1, characterized in that it includes a step of manufacturing a printed sheet with the printed image on it and the test area is located within the image.

7. The method according to claim 1, characterized in that it includes a step of manufacturing a printed sheet with the printed image on it and the test area is located outside the image.

8. The method according to claim 7, characterized in that the test region includes a color control strip.

9. The method according to claim 1, characterized in that it includes a step of manufacturing a printed sheet with the printed image on it and the test region, which consists of two parts, the first of which is located within the image, and the second part is outside the image.

10. The method according to claim 9, characterized in that the second part contains the color strip.

11. The method according to claim 1, characterized in that the values of the reflectance spectrum transform directly into correction values solid ink density.

12. The method according to claim 1, characterized in that the guises of the variance of the reflectance spectrum transform directly in the correction values of the thickness of the layer of paint.

13. The method according to claim 1, characterized in that the use of the test region containing the color strip with the test sites, which are paddy.

14. The method according to item 13, wherein the flooded areas perform a clean paint color.

15. The method according to claim 1, characterized in that the use of the test region containing the color strip with the test sites of grayscale shades.

16. The method according to claim 1, characterized in that the use of the test region containing the color strip with the test areas that bear the imprints of consecutive overlapping combinations of printing inks.

17. The method according to claim 1, characterized in that the use of the test region containing the color strip with alternating test plots neutral tri-color and black halftone shades.

18. The method according to claim 1, characterized in that the use of the test region containing the first and second color bars, and the first color band is fully three-color neutral gray tint, and the second color band is black halftone color.

19. The method according to claim 1, characterized in that the phase measurement using a spectrophotometer.

20. The method according to claim 19, characterized in that the spectrophotometer used the spectrum of the other grid and the number of sensors with computer processing.

21. The method according to claim 19, characterized in that by using a spectrophotometer to generate an output signal in the form of a number of parameters of the reflection spectrum, which describe the relative reflective characteristics of the test area in the entire visible spectrum with a predetermined constant width wavelength interval.

22. The method according to item 21, wherein the parameters of the reflectance spectrum is obtained by calculating the reflectance spectrum at each wavelength across the visible spectrum.

23. The method according to claim 19, characterized in that the parameters of the reflectance spectrum is converted into densitometric representation.

24. The method according to item 23, wherein the densitometric representation is calculated on the basis of the values of the reflectance spectrum in accordance with the standard (ANSI/ISO) response, and methods.

25. The method according to claim 1, characterized in that the specified value sets the operator of the printing process.

26. The method according to claim 1, characterized in that the specified value is obtained using the reference sheet "Color Ok".

27. The method according to claim 1, characterized in that the set value of the gain from pre-press processes.

28. The method according to claim 1, characterized in that the conversion values of the variance of the reflectance spectrum directly in the correction values is performed with the use of linear matrix equations./p>

29. The method according to p, characterized in that use linear matrix equation of the form

where R is the vector of deviations of the reflectance spectrum, which includes the variance of the spectral reflections ΔRλ), With the vector of correction that includes the calculated correction values for the blue, red, and yellow paints ΔSS, ΔCm Δsu, respectively, in the order specified, measured through the filters of primary colors, J' is 3×m "corrective" matrix relating two vectors, where m is the number of intervals of the wavelength.

30. The method according to clause 29, wherein the correction matrix quickly create in the process of printing from one color area to the next.

31. The method according to clause 29, wherein the design parameters or correction matrix specify in the printing process.

32. The method according to claim 1, characterized in that the printed sheet contains a variety of printed areas, and the step of controlling the inking of printing includes control of paint flow posando on the basis of measurement of the test field in the corresponding area, for which the correction of ink.

33. Method of controlling color on the printed sheet in the printing process, which includes the measurement of the reflectance spectrum of the test area, formed on the printed sheet, the transformation is the measured parameters of the reflectance spectrum in the colorimetric coordinates of the corresponding test area, comparison of colorimetric coordinates of the test area with the set of colorimetric coordinates to obtain the values of the characteristics of the color differences, determining whether the values of the characteristics of color differences within the range of tolerance, and, if the magnitude of the differences in color characteristics are outside the tolerance, the comparison of measured parameters of the reflectance spectrum with the given parameters of the reflectance spectrum to determine the magnitude of the deviation of the reflectance spectrum, conversion deviation of the reflectance spectrum directly in the correction and management of ink on the printing using the correction values.

34. The method according to p, characterized in that in the transition phase, use linear equations to convert the deflection of the reflectance spectrum in the correction value.

35. The method according to clause 34, wherein the phase conversion quickly create and apply corrective matrix of linear equations to obtain the correction values.

36. The method according to p, characterized in that the members of the matrix is determined using the method of least squares.

37. The method according to p, characterized in that use printed sheet with the printed image on it inside the test area.

38. The method according to p, characterized in that use print the first sheet with the printed image on it, outside of which is a test area.

39. The method according to 38, characterized in that the test area contains the color strip.

40. The method according to p, characterized in that use the sheet with the printed image on it and the test region, which has a first part located within the image, and a second part located on the outside of the image.

41. The method according to p, characterized in that the second part contains the color strip.

42. The method according to p, characterized in that the values of the reflectance spectrum transform directly into correction values solid ink density.

43. The method according to p, characterized in that the values of the reflectance spectrum transform directly in the correction values of the thickness of the layer of paint.

44. The method according to p, characterized in that the use of the test region containing the color of the test strip with paddy plots.

45. The method according to item 44, wherein the flooded areas are covered by the ink of the corresponding color.

46. The method according to p, characterized in that the use of the test region containing the color strip with the test sites of grayscale shades.

47. The method according to p, characterized in that the use of the test region containing the color band with testowy and plots which caused prints sequential overlapping combinations of printing inks.

48. The method according to p, characterized in that the use of the test region containing the color strip with alternating test plots three-color neutral black and gray shades.

49. The method according to p, characterized in that the use of the test region containing the first and second color bars with the first color band is completely covered with three-color neutral grayscale ink and the second color band is black halftone color.

50. The method according to p, characterized in that the phase measurement using a spectrophotometer.

51. The method according to item 50, wherein the spectrophotometer used spectral grating and a number of sensors with computer processing.

52. The method according to item 50, wherein by using a spectrophotometer to generate an output signal in the form of a number of parameters of the reflectance spectrum, which describe the relative reflective characteristics of the test area in the entire visible spectrum in a predetermined constant width of the wavelength interval.

53. The method of paragraph 52, wherein the parameters of the reflectance spectrum is obtained by calculating the reflectance spectrum at each wavelength across the visible spectrum.

54. Spasibo item 50, characterized in that the parameters of the reflectance spectrum is converted into densitometric representation.

55. The method according to item 54, wherein the densitometric representation of the count of the parameters of the reflectance spectrum in accordance with the standard (ANSI/ISO) response, and methods.

56. The method according to p, characterized in that the measured values of the reflectance spectrum is converted into colorimetric coordinates by the standard (CIE) spectral curves or any linear combinations of the standard (CIE) spectral curves.

57. The method according to p, characterized in that the measured values of the reflectance spectrum is converted into the colorimetric coordinates in accordance with one of the CIE color spaces.

58. The method according to p, characterized in that the specified values are established by the operator of the printing process.

59. The method according to p, characterized in that the set value of the gain, using the reference sheet "Color Ok".

60. The method according to p, wherein the specified value get from prepress processes.

61. The method according to p, characterized in that the conversion values of the variance of the reflectance spectrum directly in the correction values is performed with the use of linear matrix equations.

62. The method according to p, characterized in that the linear matrix uravneniem

where R is the vector difference of spectral reflectance, which includes the difference of the spectral reflections ΔRλ), With a correction vector that includes the calculated correction values for the blue, red, and yellow paints ΔSS, ΔCm Δsu, respectively, in the order specified, measured through the filters of primary colors, J' - 3×m "corrective" matrix relating two vectors, where m is the number of intervals of the wavelength.

63. The method according to item 62, wherein the correction matrix quickly build during print effortlessly place a call.

64. The method according to item 62, wherein the set parameters or correction matrix specify in the printing process.

65. The method according to p, characterized in that the printed sheet contains a variety of printed areas, and the step of controlling the inking of printing includes control of paint flow posando on the basis of measurement of the test field in the corresponding area, for which the correction of ink.



 

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12 cl, 5 dwg

FIELD: method and device for colored flexography.

SUBSTANCE: method for applying multiple paint layers onto a substrate includes following stages: application onto a substrate of at least one painting layer of energy-hardened liquid paint with viscosity less than approximately 4000 centipoises, and including reaction-incapable paint thinner, where applied layer of energy-hardened paint has first viscosity; evaporation of at least a part of reaction-incapable paint thinner from applied paint layer for increasing viscosity of applied layer of energy-hardened paint; application onto substrate and applied layer of energy-hardened paint with increased viscosity of at least one layer of non energy-hardened liquid paint, viscosity of which is less than increased viscosity of previously applied layer of energy-hardened paint; and drying of both paint layers on the substrate. Another variant of method for applying multiple paint layers onto a substrate is differentiated by applied layer of energy-hardened paint having to be of increased viscosity compared to following layer of energy-hardened liquid paint with viscosity less than approximately 4000 centipoises, and containing reaction-incapable paint thinner, where viscosity of following layer is less than increased viscosity of energy-hardened paint layer applied beforehand. Also a method is suggested for printing multiple paint layers on a substrate, which includes stage of selection of first and second energy-hardened liquid flexography paint, where each paint contains viscosity controlling reaction-incapable paint thinner, consisting of water in amount of from 5% to 50% of thinner weight, where each paint has viscosity approximately ranging from 30 to 70 centipoises, and stage of serial application of first and second energy-hardened liquid flexography paint onto a substrate to create first and second paint layers, having overlapping parts, where second paint is applied only after at least a part of paint thinner is evaporated in first paint layer. Device for serial application of multiple overlapping paint layers onto a substrate contains substrate route and substrate drive for moving the substrate along a route, where paint application sections are adapted for applying paint onto substrate, which paint includes reaction-incapable paint thinner and has viscosity less than 4000 centipoises, and also management system, which manages transportation of substrate along a route. Viscosity of first layer of liquid paint, applied onto a substrate in one of paint sections, is increased due to evaporation of at least a part of paint thinner from first paint layer to higher viscosity compared to viscosity of second paint, applied on top of first paint layer in next paint section, located at a certain distance from first paint section, up to viscosity, sufficient for "crude" application of second liquid paint layer during transportation of substrate between paint sections.

EFFECT: in suggested methods, relief printing is achieved without insignificant modifications of printing equipment.

4 cl, 2 dwg

FIELD: polygraphic industry, possible use for controlling technological parameters of paper flat of input roll on printing factories, which is formed in advance at paper factory.

SUBSTANCE: in the method, length of flat part of input roll, which includes control marks, is selected as controlled parameter. Marks are positioned with constant value step, which is selected depending on technologically acceptable error relatively to length of roll flat, regulated by its tensioning during technological cycle of creation of this roll at paper factory. Detection, recognition and registration of informative signs of controlled parameter is performed twice. Namely: during insertion of a roll into technological zone of roll printing machine and during removal from it. Recording of read and transformed information in memory block of electronic computing device is performed with ensured storage of that information and its possible output to information carriers, which are functionally a "roll report" with given database, based on "roll passport" information. Particularities of the system are as follows. It is provided with second block of optic-electronic devices, functionally and structurally identical to first block. One block is mounted at the point of insertion of a flat into technological zone of roll printing machine, second one - at exit point of same. Each block has commutated connection to its own electronic computing device. In front of each block, flat speed sensor is mounted, in commutated connection with corresponding electronic computing device. Software of one of the blocks is created with possible creation of database of input roll flat, and of another block - of output roll flat, and with possible storage of that information in memory blocks and its output to information carriers, which functionally act as "roll reports".

EFFECT: possible control of technological parameters of flat at input and output of roll printing machine, resulting in increased precision of control.

2 cl, 5 dwg

Sensor device // 2335403

FIELD: physics.

SUBSTANCE: invention refers to fluorescing or phosphorescing print check and detection on sheets fed to printing press for securities printing. Luminescent sensor device contains set of subunits, optical sensitive elements, at that each subunit contains ultra-violet lighters for sample illumination, digital camera system containing front element, mirror assembly tracking light radiated from the specified sample to front element of digital camera system; and digital signal processor providing processing of signals, generated by the specified front element of digital camera system. Thus fluorescing or phosphorescing print check and detection system on security sheets contains luminescent sensor device.

EFFECT: improved control quality.

10 cl, 6 dwg

FIELD: printing industry.

SUBSTANCE: method for adjustment of inking apparatus (16) of printing machine consists in the fact that in phase of preparation of printing machine for printing the first measuring accessory (22) is used to identify at least one first measuring value versus the one adjusted on inking apparatus (16) of printing machine, applied at least on one material for printing (21) of ink application, besides based on this first actual value inking apparatus applying ink onto material is adjusted for printing (21). In phase of printing machine run printing the second measuring accessory (23), which varies from the first measuring accessory (22) is used to identify several second actual values related to imprint applied onto material for printing (21) and to deliver to the adjustment device (26) that adjusts inking apparatus (16). One of second actual values detected by the second measuring accessory (23) is used in adjustment device (26) as a specified value, at the same time adjustment device (26) detects deviation of other second actual values identified in phase of printing machine run printing from applied specified value, and this deviation is minimised by new adjustment of inking apparatus that applies ink onto material for printing (21).

EFFECT: invention makes it possible to improve quality of printing.

16 cl, 2 dwg

FIELD: printing industry.

SUBSTANCE: invention relates to the field of printing. Described system of sheets control, intended for sheet machine for double-sided printing of such type, comprises two printing cylinders, intended to do simultaneous double-sided printing of sheets, at the same time specified system of sheets control comprises at least the first control device to produce image of the first side of printed sheets. The first control device comprises the first linear shaper of image signals, intended to produce image of the first side of printed sheets by means of linear scanning. At the same time the first control device is arranged so that the first linear shaper of image signal visually produces image of printed sheet, while specified printed sheet still sticks to surface of the first of two printing cylinders of printing machine, and directly prior to displacement of specified printed sheet into chain system with grips provided in printing machine. Also printing machine equipped with control system is described.

EFFECT: invention makes it possible to provide for efficient prevention of sheets smudging in process of control.

12 cl, 3 dwg

FIELD: printing industry.

SUBSTANCE: invention relates to the field of printing. Described system of sheets control intended for sheet printing machine for double-sided printing of such type comprises two printing cylinders intended to do simultaneous double-sided printing of sheets. At the same time specified system comprises at least one control device to produce images of one side of printed sheets. System of sheets control comprises the first and second transmission cylinders arranged between the first of specified two printing cylinders and chain system with grips provided in printing machine. At the same time printed sheets are moved serially from the first printing cylinder to the first transmission cylinder, to the second transmission cylinder and chain system with grips. Control device comprises linear shaper of image signals intended to produce image of one side of printed sheets by means of linear scanning, at the same time this linear shaper of image signals visually produces image of printed sheet, while printed sheet moves on the first or second transmission cylinder.

EFFECT: invention makes it possible to provide for efficient prevention of sheets smudging in process of control.

6 cl, 3 dwg

FIELD: process engineering.

SUBSTANCE: numbering system is designed to be incorporated with printing machine and consists of numbering cylinder, rotary shaft, at least, one supporting disk fitted in said shaft to revolve therewith. Support disk comprises peripheral set ring to mount at least one numbering device 2.06 on support disk periphery. Said device 2.06 is secured to peripheral et ring by means of locking mechanism. Peripheral set ring features T-cross section that defines two annular mounting grooves on each side of the ring. Numbering device 2.06 has its each side supporting locking elements 2.50 to interact with annular mounting grooves for attachment of numbering device to peripheral set ring. Locking elements 2.50 represent, preferably, spring-loaded locking elements.

EFFECT: higher reliability, simplified design.

21 cl, 12 dwg

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