Method for rapid detection of printing color of high-reflective material, system and application thereof

Abstract

The application discloses a method for rapidly detecting printing color of high-reflective material, a system thereof and application, and the method comprises the following steps: firstly, printing part of white ink on the surface of the material to cover the mirror surface reflection light on the material, so that the material has two properties of high reflection and non-high reflection; then, after color matching, the color of the high-reflective surface of the material is measured by Ci64, whether the data is in the index range is judged, the color value of the non-high-reflective surface of the material is measured by eXact2, the color value is used as the target color in the printing process, and is input into IntelliTrax2; the color data on the white ink sample is rapidly monitored; and whether the color data of the high-reflective sample is qualified is judged in a reverse mode. Since IntelliTrax2 has the advantages of rapid measurement, the measurement efficiency can be greatly improved, the time for adjusting the color ink is reduced, and the generation of printing waste is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of printed color detection, in particular to a method for rapidly detecting printed color of high light-reflective material and a system thereof and application. BACKGROUND

[0002] High light-reflective material includes gold-silver card paper, laser paper and the like. Gold-silver card paper is a kind of paper that is coated with a layer of UV oil on the surface of the paper by using UV transfer printing technology through a rubber cloth, and then a light column film or a special pattern is transferred to the printed paper by a roller, so that the surface of the paper produces a light column effect like laser paper. Laser paper, also known as laser aluminum spraying paper, is paper that has a laser holographic pattern or text signal loaded onto the surface of the paper by a molding method.

[0003] In the traditional technology, high light-reflective material such as gold-silver card paper and laser paper needs to be measured by an integrating sphere instrument, and cannot be measured by a conventional printed matter detection instrument. However, the measurement method using the integrating sphere instrument has the following problems: (1) the use of the integrating sphere instrument can only measure a single point, and each measurement takes about 5 seconds, so the efficiency is low. In time-constrained situations, especially in the task-urgent printing production link, this measurement method is not suitable at all; (2) the main parameters affecting the quality of printed matter in printing include solid density, dot area, overprint rate, gray balance, color difference and the like. The function thereof is mainly to realize that the dots on the printing plate are as faithful as possible to be transferred to the printing material, and a clear image is obtained, and the original drawing is correctly reproduced in tone and color. However, the integrating sphere spectrophotometer only has the function of color difference, and does not have the measurement function of color elements such as solid density, dot area, overprint rate and gray balance, which are often controlled in the printing industry. SUMMARY

[0004] In order to overcome the deficiencies of the prior art, one of the purposes of the present application is to provide a method for rapidly detecting printed color of high light-reflective material, which can improve the measurement efficiency of the printed color of high light-reflective material, and provide more necessary color measurement parameters, efficiently and accurately match colors, and help the digitalization, intelligentization and innovative development of the printing industry.

[0005] The second purpose of the present application is to provide a system for rapidly detecting printed color of high light-reflective material.

[0006] The third purpose of the present application is to provide a method for rapidly detecting printed color of high light-reflective material such as gold-silver card paper and laser paper.

[0007] One of the purposes of the present application is achieved by the following technical solutions:

[0008] A method for rapidly detecting printed color of high light-reflective material, comprising the following steps:

[0009] S1: cut the high-reflective material into the required paper size to obtain paper A;

[0010] S2: print a layer of white ink on the a position of the paper A to make the a position not have the high-reflective attribute to obtain paper B with the a position and the b position;

[0011] S3: print a color sample on the paper B on the color matching instrument to print a layer of color matching ink on the paper B, and the layer of color matching ink covers the layer of white ink to obtain paper C with the a position and the b position;

[0012] S4: use the Ci64 spectrophotometer to detect the color on the b position of the paper C to determine whether the color difference between the measured color and the target color is within the index range; if the color difference is within the set tolerance range, use the eXact2 spectrophotometer to measure the color data on the a position of the paper C as the target color for the printing process control;

[0013] S5: input the target color obtained in step S4 into the system of the IntelliTrax2 spectrophotometer, and then use the IntelliTrax2 spectrophotometer to quickly monitor the color data on the white ink position of the high-reflective material sample sheet during the printing process to determine whether the color of the high-reflective material sample sheet meets the requirements.

[0014] Further, in step S1, the high-reflective material is a gold-silver card paper or a laser paper.

[0015] Further, in step S1, the paper size is 5.5cm*25cm.

[0016] Further, in step S2, the a position and the b position each occupy half of the position of the paper A.

[0017] Further, in step S3, the color matching instrument is an IGT C1 color matching instrument.

[0018] Further, in step S4, the color data in the color data on the a position of the paper C includes L*, a*, b* and density data.

[0019] Further, in step S5, the following step S6 is further included:

[0020] If the color data reaches the target value, it is considered that the color on the high-reflective position of the high-reflective material sample sheet meets the requirements, otherwise, it is considered that the color on the high-reflective position of the high-reflective material sample sheet does not meet the requirements and needs to be adjusted.

[0021] The second purpose of the application is achieved by the following technical scheme:

[0022] A system for quickly detecting the printing color of high-reflective material, comprising:

[0023] A cutting module for cutting the high-reflective material into a required paper size to obtain paper A;

[0024] A pre-printing module for printing a layer of white ink on the a position of the paper A to make the a position not have the property of high reflectivity to obtain paper B having an a position and a b position;

[0025] A printing color sample module for printing a color sample on the paper B on a color display instrument to print a layer of color matching ink on the paper B, and the layer of color matching ink covers the layer of white ink to obtain paper C having an a position and a b position;

[0026] A printing target color determining module for using a Ci64 spectrophotometer to detect the color on the b position of the paper C, and judging whether the color difference between the measured color and the target color is within the index range; if the color difference is within the set tolerance range, using an eXact2 spectrophotometer to measure the color data on the a position of the paper C as the target color for the printing process control;

[0027] A monitoring and judging module for inputting the obtained target color into the system of an IntelliTrax2 spectrophotometer, and then using the IntelliTrax2 spectrophotometer to quickly monitor the color data on the white ink position of the high-reflective material sample sheet during the printing process to judge whether the printing color of the high-reflective material meets the requirements.

[0028] Further, the system further comprises:

[0029] An adjusting module for if the color data reaches the target value, it is considered that the color on the high-reflective position of the high-reflective material sample sheet meets the requirements, otherwise, it is considered that the color on the high-reflective position of the high-reflective material sample sheet does not meet the requirements and needs to be adjusted.

[0030] The third object of the present application is achieved by using the following technical scheme:

[0031] A method for quickly detecting the printing color of gold and silver card paper or laser paper.

[0032] Compared with the prior art, the present application has the following beneficial effects:

[0033] 1. The method for quickly detecting the printing color of high-reflective material according to the present application prints part of white ink on the surface of the material first, covers the mirror surface reflected light on the material, makes the material have two attributes of high-reflective and non-high-reflective, then measures the color of the high-reflective surface of the material after color matching by using Ci64, judges whether the data is in the index range or not, measures the color value of the non-high-reflective surface of the material by using eXact2, takes the color value as the target color of the printing process, inputs into IntelliTrax2, monitors the color data on the white ink sample sheet quickly, judges whether the color data of the high-reflective sample sheet is qualified or not in a reverse way, since IntelliTrax2 has the advantage of quick measurement, can greatly improve the measurement efficiency, reduce the time of adjusting the color ink, and reduce the generation of printing waste.

[0034] 2. The method for quickly detecting the printing color of high-reflective material according to the present application continuously measures the sample in the printing process, adjusts in time and appropriately according to the color of each ink key and each color of deep or shallow, reduces the opportunity of color error, keeps the color quality of the product stable, and can provide more necessary color measurement parameters, efficiently and accurately matches the color, and helps the digitalization, intelligentization and innovative development of the printing industry.

[0035] 3、The Ci64 spectrophotometer, the eXact2 spectrophotometer, the IntelliTrax2 spectrophotometer and the like are the three most widely used instruments on the market, but their applications are different; the Ci64 spectrophotometer is an integrating sphere type spectrophotometer, which has the advantages of being suitable for measuring the printing color of high-reflective materials such as gold and silver card paper and laser paper, but has the defects of single function and slow speed of single-point measurement; the eXact2 spectrophotometer is fully functional, but its structure is a 45° / 0° spectrophotometer (compliant with ISO12647), which is not suitable for measuring the printing color of high-reflective materials such as gold and silver card paper and laser paper, and the main mode is single-point measurement, which is slow; the IntelliTrax2 spectrophotometer is fully functional and is a full-automatic scanning measurement mode (34 measurements per second), which is particularly suitable for measuring color in the printing process, but its structure is a 45° / 0° spectrophotometer (compliant with ISO12647), which is not suitable for measuring the printing color of high-reflective materials such as gold and silver card paper and laser paper, and needs to create target color values with the aid of eXact2. The method for rapidly detecting the printing color of high-reflective materials of the present application combines the advantages of the Ci64 spectrophotometer, the eXact2 spectrophotometer and the IntelliTrax2 spectrophotometer, avoids their defects, complements each other and jointly completes the measurement of color. The Ci64 is a tool for color detection during color matching and finished product color detection; after the color matching color meets the standard, the eXact2 is used to measure the color of the sample sheet with white ink as the background, which is used as the target color for printing process control; the IntelliTrax2 scanning spectrophotometer can measure and control the color in the printing process, so as to make the printing color meet the standard. Once the color reaches the target value, it can be determined that the color on the high-reflective materials such as gold and silver card paper and laser paper is also qualified, so as to realize the rapid measurement of the printing color on the high-reflective materials such as gold and silver card paper and laser paper, and greatly improve the measurement efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 The laser paper of Example 1, wherein the a position is printed with white ink, and the b position is not printed with white ink;

[0037] Figure 2 The comparison chart of the color of the b position on the laser paper measured by the Ci64 in Example 1 and the target color;

[0038] Figure 3 The target data chart obtained by measuring the color of the a position on the laser paper with the eXact2 in Example 1;

[0039] Figure 4 The setting of the target color in the IntelliTrax2 in Example 1, wherein the circle is the content of the setting;

[0040] Figure 5 A result map of a printed matter of one 8-color in Example 1. DETAILED DESCRIPTION

[0041] Hereinafter, the present application will be further described in conjunction with specific embodiments. It should be noted that the following described embodiments or technical features can be combined arbitrarily to form new embodiments without conflict.

[0042] Example 1

[0043] A method for quickly detecting printing colors of a laser paper, comprising the following steps:

[0044] S1: cutting a gold-silver card paper into a paper size of 5.5 cm x 25 cm to obtain a paper A;

[0045] S2: printing a white ink layer on an a position of the paper A, so that the a position does not have a high light reflection property, to obtain a paper B with the a position and a b position;

[0046] The a position refers to a part of the paper A on which the white ink is printed, and the b position refers to a part of the paper A on which the white ink is not printed, i.e., the remaining part outside the a position. In one embodiment, the a position and the b position each occupy half of the position of the paper A (as shown in FIG. 1), so that the subsequent data collection operation is better. Since the laser paper has one half printed with a layer of white ink and the other half without the white ink, when the yellow ink is printed, the half with the white ink has no flashing effect. Figure 1

[0047] In this embodiment, the white ink is a prior art, which will not be described here again.

[0048] S3: printing a color sample on the paper B on a color display instrument to print a color matching ink layer on the paper B, and the color matching ink layer covers the white ink layer, to obtain a paper C with the a position and the b position;

[0049] In this embodiment, the color display instrument is an IGT C1 color display instrument, which facilitates printing a color sample by using a printing suitability instrument (color display instrument) during color matching, i.e., a small amount of ink is printed on a substrate to simulate the printing color effect during the color matching process, without the need for testing on a printing machine, which leads to a large amount of wasted ink, paper and time.

[0050] Since the a position is printed with the white ink first, and then the color matching ink layer covers the white ink layer, at this time, the a position still has no flashing effect.

[0051] In this embodiment, the color matching ink is a color selected according to the needs of a customer, which will not be described here again.

[0052] ​S4: Using Ci64 spectrophotometer, the color on the b position of paper C is detected to determine whether the color difference value (DE*) between the measured color and the target color is within the index range; if the color difference value (DE*) is within the set tolerance range (in this embodiment, the light column laser DE* < 2.5), the color data on the a position of paper C is measured using eXact2 spectrophotometer as the target color for printing process control;

[0053] In one embodiment, the color data in the color data on the a position of paper C includes L*, a*, b* and density data.

[0054] As shown in Figure 2 and Figure 3 , the color on the b position of the laser paper is measured using Ci64 and compared with the target color (customer sample color or data), the color difference DE* = 0.61 < 2.5, which is within the tolerance range, and is qualified (as shown in Figure 2 ); the color on the white ink (a position) is measured using eXact2 to obtain L*a*b* and density data as the target data for printing process control (as shown in Figure 3 ).

[0055] S5: The target color obtained in step S4 is input into the system of IntelliTrax2 spectrophotometer (i.e. the target color is set in IntelliTrax2), and then the color data on the white ink position of the laser paper sample is quickly monitored during the printing process using IntelliTrax2 spectrophotometer to determine whether the printing color of the laser paper meets the requirements.

[0056] As shown in Figure 4 , all target colors of a work order are input into the IntelliTrax2 system in this way, and then the color can be measured during the printing process using IntelliTrax2, the measurement is completed during the rapid movement of the scanning head, and the measurement data is displayed on the computer screen in real time.

[0057] S6: If the color data meets the target value, it is considered that the color on the high light reflection position of the laser paper sample meets the requirements, otherwise, it is considered that the color on the high light reflection position of the laser paper sample does not meet the requirements and needs to be adjusted.

[0058] As shown in Figure 5As shown, it is a measurement result of an 8-color printed matter. The 8 colors of the printed matter are on the left side of the longitudinal direction, which are two gray-white colors, one brown-yellow color, one blue color, one yellow color, and three red colors. The numbers 5, 7, 9, etc. in the horizontal direction represent the ink key numbers of the printing machine, and each ink key of each color corresponds to a color data. The data in the column chart is the printed color density value on each ink key of the printing machine, which has three colors of red, yellow, and green. Green represents that the printed color is very close to the target color; yellow represents that the printed color is within the tolerance range, but there is a certain gap, which can be adjusted appropriately; and red represents that it is out of the tolerance range and must be adjusted to meet the requirements.

[0059] As to the color data of this printed matter, most of the colors are within the tolerance range, and the colors of individual ink keys of individual colors need to be adjusted. The two gray-white colors and the brown-yellow color are close to the target color; the 9th, 11th, 16th, 18th, and 25th ink keys of the blue color have large differences and need to be adjusted, such as the density difference of the 9th ink key is 0.032, which is too deep and needs to reduce the ink amount. The 28th ink key of the second red color has a density difference of -0.068, which is too light and needs to increase the ink amount. And so on. The printing machine operator can quickly judge whether to adjust according to the red, yellow, and green indications, and judge the adjustment range according to the difference in the numerical value. Figure 5 As can be known from the embodiment, the method of the application has the advantages of fast color measurement and keeping the consistency of the target color.

[0060] As shown in the measurement result, there are 8 colors, 25 ink keys, and 8x25=200 density values, and a total of 400 data including color difference values. For a printed matter with dot gain, overprint rate, and gray balance parameters, more than 500 data can be obtained within 15 seconds. If a Ci64 single-point measurement is used, it takes about 5 seconds to measure one data, so the scanning measurement method of InteliTrax2 greatly improves the measurement efficiency. (2) Keeping the consistency of the target color: continuously sampling and measuring during the printing process, and adjusting the color depth or lightness of each color on each ink key at any time, reducing the chance of color errors and keeping the product color quality stable. Figure 5 Embodiment 2

[0061] A method for quickly detecting the printing color of gold and silver card paper, comprising the following steps:

[0062] S1: cutting the gold and silver card paper into a paper size of 5.5 cm x 25 cm to obtain paper A;

[0063] S2: printing the paper A to obtain a printed matter B;

[0064] S2: printing a layer of white ink on the a position of the paper A, so that the a position does not have the attribute of high light reflection, to obtain paper B with a position and b position;

[0065] In one embodiment, the a position and the b position each occupy half of the paper A.

[0066] In this embodiment, the white ink is a prior art, which is not described here.

[0067] S3: printing a color sample on the paper B on the color display instrument, printing a layer of matching ink on the paper B, and the layer of matching ink covers the layer of white ink, to obtain paper C with a position and b position;

[0068] In this embodiment, the color display instrument is IGT C1 color display instrument.

[0069] Since the a position is printed with white ink first, and then the layer of matching ink covers the layer of white ink, at this time, the a position still does not have the effect of high light reflection.

[0070] In this embodiment, the matching ink is a prior art, and the color is selected according to the needs of the customer, which is not described here.

[0071] S4: using Ci64 spectrophotometer to detect the color on the b position of the paper C, to determine whether the color difference value (DE*) between the measured color and the target color is within the index range; if the color difference value (DE*) is within the set tolerance range (in this embodiment, silver card DE*<2.0), use eXact2 spectrophotometer to measure the color data on the a position of the paper C as the target color for process control;

[0072] In one embodiment, the color data in the color data on the a position of the paper C includes L*, a*, b* and density data.

[0073] S5: inputting the target color obtained in step S4 into the system of IntelliTrax2 spectrophotometer (i.e. setting the target color in IntelliTrax2), and then using IntelliTrax2 spectrophotometer to quickly monitor the color data on the white ink position of the gold and silver card sample during the printing process, to determine whether the printing color of the gold and silver card meets the requirements.

[0074] S6: if the color data reaches the target value, it is considered that the color on the high light reflection position of the gold and silver card sample meets the requirements, otherwise, it is considered that the color on the high light reflection position of the gold and silver card sample does not meet the requirements and needs to be adjusted.

[0075] The method for quickly detecting the printed color of the high-reflective material in the above-mentioned embodiment 1 and embodiment 2 first prints a part of white ink on the surface of the material to cover the specular reflection light on the material, so that the material has two properties of high-reflective and non-high-reflective, then after color matching, the color of the high-reflective surface of the material is measured by Ci64 to determine whether the data is within the index range, and then the color value of the non-high-reflective surface of the material is measured by eXact2 as the target color of the printing process and input into IntelliTrax2 to quickly monitor the color data on the white ink sample sheet to determine whether the color data of the high-reflective sample sheet is qualified in a reverse manner. Since IntelliTrax2 has the advantage of fast measurement, the measurement efficiency can be greatly improved, the time for adjusting the color ink is reduced, and the generation of printing waste is reduced.

[0076] Meanwhile, the method continuously measures samples during the printing process and adjusts in time and appropriately according to the color of each ink key and each color depth or lightness, reduces the opportunity for color errors, keeps the color quality of the product stable, and can provide more necessary color measurement parameters, efficiently and accurately color matches, and helps the digitalization, intelligentization and innovative development of the printing industry.

[0077] Embodiment 3

[0078] A system for quickly detecting the printed color of a high-reflective material, comprising:

[0079] A cutting module for cutting the high-reflective material into a required paper size to obtain paper A;

[0080] A pre-printing module for printing a layer of white ink on the a position of the paper A to make the a position not have the property of high-reflectivity to obtain paper B having an a position and a b position;

[0081] A printing color sample module for printing a color sample on the color guide of the paper B to print a layer of color matching ink on the paper B, and the layer of color matching ink covers the layer of white ink to obtain paper C having an a position and a b position;

[0082] A printing target color determination module for using Ci64 spectrophotometer to detect the color on the b position of the paper C to determine whether the color difference between the measured color and the target color is within the index range; if the color difference is within the set tolerance range, using eXact2 spectrophotometer to measure the color data on the a position of the paper C as the target color for the printing process control;

[0083] The monitoring and judging module is used for inputting the obtained target color into the system of the IntelliTrax2 spectrophotometer, and then using the IntelliTrax2 spectrophotometer to quickly monitor the color data on the white ink position of the high-reflective material sample sheet during the printing process, so as to judge whether the printing color of the high-reflective material meets the requirements or not.

[0084] The adjusting module is used for considering that the color on the high-reflective position of the high-reflective material sample sheet meets the requirements if the color data reaches the target value, and considering that the color on the high-reflective position of the high-reflective material sample sheet does not meet the requirements if the color data does not reach the target value, and then adjusting.

[0085] The system for quickly detecting the printing color of the high-reflective material in the embodiment is composed of the modules, is matched with the method for quickly detecting the printing color of the high-reflective material, combines the advantages of the Ci64 spectrophotometer, the eXact2 spectrophotometer and the IntelliTrax2 spectrophotometer, avoids the disadvantages of the Ci64 spectrophotometer, the eXact2 spectrophotometer and the IntelliTrax2 spectrophotometer, and complements each other to jointly complete the color measurement, so that the printing color on the high-reflective material such as the gold and silver card paper and the laser paper is quickly measured, and the measurement efficiency is greatly improved.

[0086] The above-mentioned embodiments are only the preferred embodiments of the present application, and cannot be used to limit the protection scope of the present application, and any non-essential changes and replacements made by the person skilled in the art on the basis of the present application all belong to the protection scope of the present application.

Claims

1. A method for rapid detection of printed color of high-reflectance materials, characterized in that, The method comprises the following steps: S1: cutting a high-reflective material into a required paper size to obtain paper A; S2: printing a layer of white ink on the a position of the paper A to make the a position not have the attribute of high reflection, to obtain paper B having an a position and a b position; the b position is the remaining part outside the a position; S3: printing a color sample on the paper B on a color display instrument to print a layer of color matching ink on the paper B, and the color matching ink layer covers the white ink layer, to obtain paper C having an a position and a b position; S4: using a Ci64 spectrophotometer to detect the color on the b position of the paper C, and judging whether the color difference between the measured color and a target color is within an index range; if the color difference is within the set index range, using an eXact2 spectrophotometer to measure the color data on the a position of the paper C as a target color for process control; S5: inputting the target color obtained in step S4 into a system of an IntelliTrax2 spectrophotometer, and then using the IntelliTrax2 spectrophotometer to quickly monitor the color data on the white ink layer position of the high-reflective material paper during printing to determine whether the color of the high-reflective material paper meets the requirements.

2. The method for rapid detection of printed color of high-reflective material according to claim 1, characterized in that, In step S1, the high-reflective material is a gold-silver card paper or a laser paper.

3. The method for rapid detection of printed color of high-reflective material according to claim 1, characterized in that, In step S1, the paper size is 5.5 cm*25 cm.

4. The method for rapid detection of printed color of high-reflective material according to claim 1, characterized in that, In step S2, the a position and the b position each occupy half of the position of the paper A.

5. The method for rapid detection of printed color of high-reflective material according to claim 1, characterized in that, In step S3, the color display instrument is an IGT C1 color display instrument.

6. The method for rapid detection of printed color of high-reflective material according to claim 1, characterized in that, In step S4, the color data in the color data on the a position of the paper C includes L*, a*, b* and density data.

7. The method for rapid detection of printed color of high-reflective material according to claim 1, wherein, In step S5, the method further comprises the following step S6: If the color data reaches the target value, it is considered that the color on the high-reflective position of the high-reflective material paper meets the requirements, otherwise, it is considered that the color on the high-reflective position of the high-reflective material paper does not meet the requirements and needs to be adjusted.

8. A system for rapid detection of printed color of high-reflectance materials, characterized in that, The method comprises the following steps: a cutting module for cutting a high-reflective material into a required paper size to obtain paper A; a pre-printing module for printing a layer of white ink on the a position of the paper A to make the a position not have the attribute of high reflection, to obtain paper B having an a position and a b position; the b position is the remaining part outside the a position; a color sample printing module for printing a color sample on the paper B on a color display instrument to print a layer of color matching ink on the paper B, and the color matching ink layer covers the white ink layer, to obtain paper C having an a position and a b position; a target color determination module for using a Ci64 spectrophotometer to detect the color on the b position of the paper C, and judging whether the color difference between the measured color and a target color is within an index range; if the color difference is within the set index range, using an eXact2 spectrophotometer to measure the color data on the a position of the paper C as a target color for process control; The monitoring and judging module is used for inputting the obtained target color into the system of the IntelliTrax2 spectrophotometer, and then using the IntelliTrax2 spectrophotometer to quickly monitor the color data on the white ink layer position of the high-reflective material paper during the printing process, so as to judge whether the printing color of the high-reflective material paper meets the requirements.

9. The system for rapid detection of printed color of high-reflective material according to claim 8, characterized in that, The system further comprises: The adjusting module is used for considering that the color on the high-reflective position of the high-reflective material paper meets the requirements if the color data reaches the target value, and considering that the color on the high-reflective position of the high-reflective material paper does not meet the requirements and needs to be adjusted if not.

10. A method for quickly detecting the printing color in the gold and silver card paper or the laser paper by using the method according to any one of claims 1-7.

Images