An ink concentration adjustment control system for printing

Abstract

The present application belongs to the technical field of ink concentration regulation for printing, and specifically discloses an ink concentration regulation and control system for printing, which comprises: determining the ink concentration deficiency compensation parameter of the actual printing of the two-dimensional code by detecting the ink concentration of the standard gray profile of the pre-printed pattern of the cigarette case two-dimensional code and the cigarette case paper characteristics, so that the printed pattern can be more closely combined with the paper; comparing the ink concentration difference between the two-dimensional code film coating pattern and the standard gray profile of the pre-printed pattern to determine the concentration defects and quality defects in the post-processing process of the two-dimensional code, which comprises: detecting the color saturation and light transmittance of the two-dimensional code film coating pattern to evaluate the visual effect difference of the two-dimensional code film coating pattern and regulate the ink concentration; detecting the adhesion effect difference of each ink adhesion effect defect point to regulate the ink quality. This is helpful to ensure that the subsequent printed two-dimensional code maintains consistent high quality in visual effect and adhesion effect.

Description

Technical Field

[0001] This invention belongs to the field of printing ink concentration control technology, and relates to a printing ink concentration adjustment and control system. Background Technology

[0002] In today's printing industry, with the increasing diversification of market demands and the rapid development of printing technology, the requirements for printing quality have reached an unprecedented level.

[0003] Because cigarette boxes are usually made of special paper with special properties to increase their lifespan, these special properties can hinder the ink printing of QR codes on the cigarette boxes. For example, coated paper and laser paper may prioritize appearance but also require a certain degree of moisture resistance; white cardboard, due to its high strength, focuses more on protecting the integrity of the cigarette box, so it is necessary to adjust the ink concentration to prevent problems with pattern integrity during the printing process.

[0004] In the existing technology, there are also some solutions related to the control of ink concentration for printing. For example, Chinese patent publication number CN117891169A discloses a detection and control system for ink concentration for printing. By setting a stirring mechanism, it can fully mix and stir ink with concentrated ink or ink pigments and other materials, thereby making the ink stirring more thorough and efficient. After preparation, the lifting mechanism can drive the sampling mechanism to take samples from different layers of the equipment in the tank, thereby making the detection data more accurate.

[0005] While the above solutions offer some methods for controlling the concentration of printing inks, they still have the following limitations: 1. Limited means of detecting ink concentration. They often only focus on basic state indicators such as the uniformity and concentration of the ink itself, and cannot gain a deeper understanding of the binding of the ink at the microscopic level. This makes it difficult to determine the appropriate ink concentration and achieve a tight and perfect bond between the printed pattern and the substrate.

[0006] 2. The lack of assessment of the impact of post-processing on QR code printing quality, as well as the lack of quantitative data on subtle ink concentration changes between the laminated pattern and the pre-printed pattern, makes it impossible to detect in a timely manner situations such as ink concentration dilution caused by glue during the lamination process. This results in inconsistent visual and adhesion effects of the final product, making it impossible to guarantee that subsequent printed QR codes will maintain consistent high quality in both visual and adhesion effects. Summary of the Invention

[0007] In view of this, in order to solve the problems mentioned in the background art, a printing ink concentration adjustment and control system is proposed.

[0008] The objective of this invention can be achieved through the following technical solution: This invention provides a printing ink concentration adjustment and control system, which includes: a QR code pattern acquisition module for cigarette boxes, used to acquire the standard grayscale outline of the pre-printed QR code pattern of cigarette boxes, and identify the ink concentration of each coordinate point cluster to which the standard grayscale outline belongs.

[0009] The paper characteristic detection module is used to detect the characteristics of cigarette box paper, including material characteristics, surface characteristics, and basis weight characteristics, and to obtain the adsorption condition matrix of the cigarette box paper characteristics on ink. .

[0010] The ink concentration assessment module is used to determine the ink concentration deficiency compensation parameters for each coordinate point cluster based on the ink adsorption condition matrix of the cigarette box paper characteristics and the ink concentration of each coordinate point cluster belonging to the standard grayscale profile.

[0011] The post-processing inspection module is used to detect post-processing quality differences in QR code printing operations, including visual quality differences. Difference in adhesion effect at various ink adhesion defect points , This indicates the number of each ink adhesion defect point. .

[0012] The ink property correction module is used to identify printing ink defect properties, including ink concentration defects and ink quality defects. When the printing ink defect property is an ink concentration defect, the ink concentration supplementation parameter is determined; when the printing ink defect property is an ink quality defect, the ink mixing parameter is determined.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: (1) The present invention determines the ink concentration deficiency compensation parameter of the actual printing of the QR code by detecting the ink concentration of each coordinate point cluster of the standard gray contour of the pre-printed pattern of the cigarette box and detecting the characteristics of the cigarette box paper. This enables the printed pattern to be more tightly bonded to the paper and enhances the moisture-proof and wear-resistant functions of the cigarette box QR code to a certain extent.

[0014] (2) By comparing the ink concentration difference between the standard grayscale outline of the QR code coating pattern and the pre-printed pattern, this invention can identify specific problems in the QR code post-processing process (such as coating), including concentration defects and quality defects. This can be used as an early warning mechanism to promptly detect the impact of post-processing on ink concentration during the production process, which helps to avoid printing quality defects caused by these defects and thus reduce the scrap rate of QR code printing.

[0015] (3) This invention evaluates the visual effect difference of the QR code coating pattern by detecting the color saturation and light transmittance of the QR code coating pattern, thereby increasing the accuracy of ink concentration control precision; by detecting the adhesion effect difference of each ink adhesion effect defect point, it increases the accuracy of ink quality control, which helps to ensure that the QR codes printed subsequently maintain consistent high quality in visual effect and adhesion effect, thereby improving the overall quality of printed products. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the system module connections of the present invention.

[0018] Figure 2 This is a schematic diagram of the coordinate point clusters with different gray values ​​in this invention.

[0019] Figure 3 This is a schematic diagram illustrating the process for determining the defect categories of the QR code overlay pattern post-processing effect in this invention.

[0020] Attached image label: 1. Coordinate point. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figure 1 As shown, the present invention provides a printing ink concentration adjustment and control system, which includes: a QR code pattern acquisition module for cigarette boxes, a paper characteristic detection module, an ink concentration evaluation module, a post-processing detection module, and an ink property correction module.

[0023] The cigarette box uses a QR code pattern acquisition module connected to a paper characteristic detection module, which in turn is connected to an ink concentration evaluation module. The ink concentration evaluation module is connected to a post-processing detection module, and the post-processing detection module is connected to an ink property correction module.

[0024] The QR code pattern acquisition module for cigarette boxes is used to acquire the standard grayscale outline of the pre-printed QR code pattern on the cigarette box and identify the ink density of each coordinate point cluster to which the standard grayscale outline belongs.

[0025] Please see Figure 2 As shown, in a preferred embodiment, the ink density of each coordinate point cluster to which the standard grayscale contour belongs includes: since a QR code is a two-dimensional image structure, where each pixel has its own position coordinates, the two-dimensional coordinate system is based on any right-angled side of the QR code. shaft and The axis uses contour recognition technology to detect the standard grayscale values ​​of each coordinate point on the standard grayscale contour of the pre-printed QR code pattern on the cigarette box, compares them with each other, and clusters the coordinate points with different grayscale values.

[0026] The standard grayscale value of each coordinate point cluster is matched with the corresponding grayscale value of each preset ink concentration to obtain the ink concentration of each coordinate point cluster to which the standard grayscale outline of the QR code preprint pattern belongs.

[0027] The paper characteristic detection module is used to detect the characteristics of cigarette box paper, including material characteristics, surface characteristics, and basis weight characteristics, and to obtain the adsorption condition matrix of the cigarette box paper characteristics on ink. .

[0028] In a preferred embodiment, the material properties include coated paper, white cardboard, and laser paper.

[0029] The surface properties include roughness and water absorption.

[0030] The basis weight characteristics include paper thickness and tensile strength.

[0031] In a further preferred embodiment, the step of obtaining the ink adsorption condition matrix based on the characteristics of the cigarette box paper includes: Tep1, obtaining the corresponding acidity and alkalinity of the material characteristics of the cigarette box, and obtaining the acidity and alkalinity of the ink configured for the pre-printed QR code pattern on the cigarette box.

[0032] An adsorption experiment was conducted to determine the adhesion relationship between the properties of various acidic and alkaline materials and the acidic and alkaline formulations of inks. This table was then used to extract the adhesion relationship between the material properties of cigarette boxes and the acidity / alkalinity of the formulated inks. .

[0033] It should be noted that the relationship between the material properties of cigarette boxes and the acidity or alkalinity of the ink used for adhesion is quite complex. For example, acidic paper may reduce the adhesion between the ink and the paper because the acidic environment may affect the surface properties of the paper fibers, making it difficult for the ink to adhere firmly. Neutral paper has a milder surface property, which is conducive to ink adhesion. However, the effect of alkaline paper on ink adhesion is more complex. On the one hand, appropriate alkalinity may promote the formation of chemical bonds between certain inks and paper, enhancing adhesion; on the other hand, if the alkalinity is too strong, it may cause the paper fibers to swell, making the paper surface rough and thus affecting the uniform adhesion of the ink.

[0034] Tep2, denote the corresponding elements of the surface properties of the paper used for cigarette boxes as follows: And obtain the appropriate preset ranges for each element of the surface properties of the paper used for cigarette boxes. Adsorption parameters of the surface properties of cigarette boxes were compared and determined. ,in They represent belonging to the symbol and not belonging to the symbol, respectively. The corresponding element numbers indicate the surface properties of the paper used for cigarette boxes. ,like Roughness element representing the surface properties of paper used in cigarette boxes. Elements representing the surface properties of paper used in cigarette boxes, specifically the water absorption rate.

[0035] It should be noted that, regarding surface characteristics: rough paper surfaces have more microscopic uneven structures, which provide more adsorption sites for ink. Therefore, the gaps between fibers in rough paper are larger, which is conducive to ink penetration. However, due to the inconsistent degree of surface unevenness, the amount and speed of ink adsorption at different locations may vary. An excessively rough paper surface may also lead to uneven ink adsorption.

[0036] Paper with insufficient absorbency cannot fully absorb ink, which reduces the ink's adhesion to the paper surface; while when the paper has excessive absorbency, the ink is prone to smudging on the paper.

[0037] Step 3: Obtain the appropriate preset ranges for each element corresponding to the basis weight characteristics of the cigarette box paper. Compare the basis weight characteristics of the cigarette box paper with these ranges. Based on the adsorption parameter acquisition method of the surface characteristics of the cigarette box paper, similarly determine the adsorption parameters of the basis weight characteristics of the cigarette box paper. .

[0038] It should be noted that, regarding grammage characteristics: paper that is too thin means that the fiber content in the paper is relatively low, and the space inside for ink to absorb is limited; paper that is too thick will hinder ink penetration.

[0039] Paper with low tensile strength is prone to deformation during ink absorption, such as wrinkles and tears; paper with high tensile strength has tightly bonded fibers, which may hinder ink penetration.

[0040] Te4. Obtain the ink adsorption condition matrix of cigarette box paper. .

[0041] The ink concentration evaluation module is used to determine the ink concentration deficiency compensation parameter for each coordinate point cluster based on the ink adsorption condition matrix of the cigarette box paper characteristics and the ink concentration of each coordinate point cluster to which the standard grayscale profile belongs.

[0042] In a preferred embodiment, determining the ink density deficiency compensation parameter for each coordinate point cluster includes: recording the ink density of each coordinate point cluster belonging to the standard grayscale outline of the QR code preprint as... , This indicates the number of each coordinate point cluster. .

[0043] Set the weight coefficient matrix corresponding to the characteristics of cigarette box paper. Determine the ink concentration deficiency compensation parameters for each coordinate point cluster. , These represent the weighting coefficients for material properties, surface properties, and basis weight, respectively, and e represents the natural constant.

[0044] It should be noted that the weighting coefficient matrix for the paper characteristics of the cigarette box is set as follows: Since differences in ink adhesion based on the material are fundamental to clear and accurate QR code printing, material characteristics have a high weight, with a weighting coefficient of 0.4-0.5; surface characteristics such as roughness and water absorption significantly affect ink distribution, with a weighting coefficient of 0.3-0.4; and paper thinness and tensile strength, among the basis weight characteristics, indirectly affect ink concentration by influencing the overall performance of the paper, with a weighting coefficient of 0.2-0.3. For example, .

[0045] This invention determines the ink density deficiency compensation parameter for the actual printing of the QR code by detecting the ink density of each coordinate point cluster of the standard grayscale outline of the pre-printed pattern of the QR code on the cigarette box and detecting the characteristics of the cigarette box paper. This enables the printed pattern to bond more tightly with the paper and enhances the moisture-proof and wear-resistant functions of the QR code on the cigarette box to a certain extent.

[0046] The post-processing detection module is used to detect the post-processing effect differences in the QR code printing operation, including visual effect differences. Difference in adhesion effect at various ink adhesion defect points , This indicates the number of each ink adhesion defect point. .

[0047] The post-processing techniques include film thickness, adhesive type, and varnish coating thickness.

[0048] Please see Figure 3 As shown, in a preferred embodiment, the visual effect difference is obtained by: acquiring the QR code lamination pattern after the cigarette box post-processing operation; and similarly acquiring the actual ink printing concentration of each coordinate point cluster on the QR code lamination pattern based on the ink density of each coordinate point cluster belonging to the standard grayscale outline of the QR code pre-printed pattern. .

[0049] The ink density of each coordinate point cluster belonging to the standard grayscale outline of the QR code pre-printed pattern is compared with the ink density of the corresponding coordinate point cluster on the QR code lamination pattern to determine the defect category number of the post-processing effect of the QR code lamination pattern. The post-processing effect defect categories include visual effect defect categories and adhesion effect defect categories, where... These represent the preset numbers belonging to the categories of no defects, visual effect defects, and adhesion effect defects, respectively. Represents any symbol, Indicates the identity sign. This means that when i takes any number They are all equal and The difference result is the result of identity.

[0050] when At that time, the identical difference result is used as the numerator and compared with the preset reference difference result to obtain the color saturation difference of the QR code overlay pattern. .

[0051] Measuring the ink concentration at specific wavelengths for each coordinate cluster on a QR code overlay pattern under different lighting conditions. Obtain the ratio between its ink concentration and the ink concentration of the corresponding coordinate point cluster. Let be the transmittance of each coordinate point cluster on the QR code coating pattern at a specific wavelength under different lighting conditions. The standard deviation of the transmittance of the QR code coating pattern under different lighting conditions is calculated using the standard deviation formula. , Numbers indicating different lighting conditions. .

[0052] For example, within the visible light range, multiple wavelengths can be selected for measurement to observe the trend of transmittance changes. If the change is large, it indicates poor grayscale stability.

[0053] The visual effect difference of the QR code coated pattern is constructed by using the color saturation difference and transmittance standard deviation of the QR code coated pattern. .

[0054] In a further preferred embodiment, the adhesion effect difference of each ink adhesion defect point includes: when At the same time, the grayscale values ​​of each coordinate point on the QR code lamination pattern are obtained and compared with the standard grayscale values ​​of the corresponding coordinate points on the standard grayscale outline of the pre-printed QR code pattern on the cigarette box. The coordinate points where the grayscale values ​​do not match are recorded as the ink adhesion defect points of the QR code lamination pattern. Defects in ink adhesion, such as grayscale abrupt changes and smudging defects.

[0055] Analyze the adhesion difference at various ink adhesion defect points ,in This indicates the preset reference grayscale difference value. This represents the preset grayscale baseline value for the smudge defect point. The standard grayscale outline of the pre-printed QR code pattern on the cigarette box The standard grayscale value of each coordinate point.

[0056] It should be noted that the grayscale jump point refers to the coordinate point where ink was originally present, but after printing, there is no ink or the ink concentration is substandard. The smudging defect point refers to the coordinate point where ink was originally absent, but after printing, there is ink or the ink concentration exceeds the standard.

[0057] The ink property correction module is used to identify printing ink defect properties, including ink concentration defects and ink quality defects. When the printing ink defect property is an ink concentration defect, the ink concentration supplementation parameter is determined; when the printing ink defect property is an ink quality defect, the ink mixing parameter is determined.

[0058] In a preferred embodiment, identifying the defect attributes of the printing ink specifically involves: obtaining the corresponding standard threshold values ​​for the visual effect difference and adhesion effect difference of the pre-printed QR code pattern on the cigarette box. , Identify the defect attributes of printing ink ,in Indicates ink concentration defect. This indicates a defect in ink quality. Indicates the existence of a symbol.

[0059] In a further preferred embodiment, determining the ink concentration supplementation parameter includes: detecting the ink concentration dilution rate of the QR code printed pattern on the cigarette box during the printing drying cycle and the lamination process cycle, respectively denoted as... .

[0060] It should be noted that the ink concentration lightening rate during the printing drying cycle and the lamination process cycle refers to the degree to which the ink grayscale value of the QR code printed pattern becomes lighter at the corresponding start and end times of the printing drying cycle and the lamination process cycle.

[0061] Determine ink concentration supplementation parameters , These represent the weights of the concentration compensation effects for the preset printing drying and lamination processes, respectively. This indicates the amount of ink replenishment corresponding to the preset unit ink concentration defect coefficient.

[0062] In a further preferred embodiment, determining the ink mixing parameters includes: detecting various flow characteristics of the current ink concentration, such as viscosity, surface tension, and ink particle size, using sensor instruments; comparing these values ​​with preset standard values ​​for the corresponding flow characteristics; calculating the difference; and then dividing by the corresponding preset reference difference value for each flow characteristic to accumulate the actual flow uniformity of the current ink concentration. .

[0063] Adhesion effect difference based on each ink adhesion defect point Determine the ink mixing power , This indicates the preset unit adhesion effect evaluation coefficient and the corresponding stirring power. Based on this, the ink is stirred to ensure consistent ink concentration.

[0064] This invention identifies specific problems in QR code post-processing (such as lamination) by comparing the ink concentration difference between the standard grayscale outline of the QR code overprinted pattern and the pre-printed pattern. These problems include concentration defects and quality defects. This serves as an early warning mechanism to promptly detect the impact of post-processing on ink concentration during production, helping to avoid printing quality defects caused by these defects and thus reducing the scrap rate of QR code printing. For example, if the ink concentration differences of all coordinate point clusters are equal, it indicates that the ink flow quality of the QR code printing pattern is relatively uniform, but the overall concentration is not up to standard. In subsequent printing operations, the ink concentration needs to be adjusted specifically to identify the type of visual effect defect in the post-processing. If the ink concentration of all coordinate point clusters is equal to that of the corresponding coordinate point clusters on the standard outline, it is determined that the ink concentration and its quality have met the required conditions and no adjustment is needed. If none of the above conditions are met, it indicates that there may be defects in the ink quality, such as peeling or smudging in some areas of the QR code, which affects its adhesion to the paper. This indicates the type of adhesion effect defect in the post-processing and requires adjustment of the ink quality.

[0065] Meanwhile, this invention assesses the visual effect difference of the QR code coating pattern by detecting the color saturation and light transmittance of the QR code coating pattern, thereby increasing the accuracy of ink concentration control. By detecting the adhesion effect difference at each ink adhesion defect point, it increases the accuracy of ink quality control, which helps to ensure that the QR codes printed subsequently maintain a consistent high quality in terms of visual effect and adhesion effect, thereby improving the overall quality of printed materials.

[0066] The above content is merely an example and illustration of the concept of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the concept of the invention or exceed the scope defined by the present invention, and all such modifications and additions should fall within the protection scope of the present invention.

Claims

1. A printing ink concentration adjustment and control system, characterized in that, include: The cigarette box QR code pattern acquisition module is used to acquire the standard grayscale outline of the pre-printed QR code pattern on the cigarette box and identify the ink density of each coordinate point cluster to which the standard grayscale outline belongs. The paper characteristic detection module is used to detect the characteristics of cigarette box paper, including material characteristics, surface characteristics, and basis weight characteristics, and to obtain the adsorption condition matrix of the cigarette box paper characteristics on ink. ; The ink concentration assessment module is used to determine the ink concentration deficiency compensation parameters for each coordinate point cluster based on the ink adsorption condition matrix of the cigarette box paper characteristics and the ink concentration of each coordinate point cluster to which the standard grayscale profile belongs. The post-processing inspection module is used to detect post-processing quality differences in QR code printing operations, including visual quality differences. Difference in adhesion effect at various ink adhesion defect points , This indicates the number of each ink adhesion defect point. ; The ink property correction module is used to identify printing ink defect properties, including ink concentration defects and ink quality defects. When the printing ink defect property is an ink concentration defect, the ink concentration supplementation parameter is determined; when the printing ink defect property is an ink quality defect, the ink mixing parameter is determined.

2. The ink concentration adjustment and control system for printing according to claim 1, characterized in that, The ink density of each coordinate point cluster to which the standard grayscale contour belongs is identified, including: since a QR code is a two-dimensional image structure, where each pixel has its own position coordinates, the two-dimensional coordinate system is based on any right-angled side of the QR code. shaft and The axis uses contour recognition technology to detect the standard gray values ​​of each coordinate point on the standard gray contour of the pre-printed QR code pattern on the cigarette box, compares them with each other, and clusters the coordinate points with different gray values. The standard grayscale value of each coordinate point cluster is matched with the corresponding grayscale value of each preset ink concentration to obtain the ink concentration of each coordinate point cluster to which the standard grayscale outline of the QR code preprint pattern belongs.

3. The ink concentration adjustment and control system for printing according to claim 1, characterized in that, The material properties include coated paper, white cardboard, and laser paper; The surface properties include roughness and water absorption. The weight characteristics include paper thickness and tensile strength.

4. The ink concentration adjustment and control system for printing according to claim 1, characterized in that, The matrix of conditions for obtaining the ink adsorption properties of cigarette box paper includes: Step 1: Obtain the acidity and alkalinity of the material used for cigarette boxes, and obtain the acidity and alkalinity of the ink used to pre-print the QR code pattern on the cigarette boxes. An adsorption experiment was conducted to determine the adhesion relationship between the properties of various acidic and alkaline materials and the acidic and alkaline formulations of inks. This table was then used to extract the adhesion relationship between the material properties of cigarette boxes and the acidity / alkalinity of the formulated inks. ; Tep2, denote the corresponding elements of the surface properties of the paper used for cigarette boxes as follows: And obtain the appropriate preset ranges for each element of the surface properties of the paper used for cigarette boxes. Adsorption parameters of the surface properties of cigarette boxes were compared and determined. ,in They represent belonging to the symbol and not belonging to the symbol, respectively. The corresponding element numbers indicate the surface properties of the paper used for cigarette boxes. , Roughness element representing the surface properties of paper used in cigarette boxes. Elements indicating the surface properties of paper used in cigarette boxes, specifically the water absorbency. Step 3: Obtain the appropriate preset ranges for each element corresponding to the basis weight characteristics of the cigarette box paper. Compare the basis weight characteristics of the cigarette box paper with these ranges. Based on the adsorption parameter acquisition method of the surface characteristics of the cigarette box paper, similarly determine the adsorption parameters of the basis weight characteristics of the cigarette box paper. ; Te4. Obtain the ink adsorption condition matrix of cigarette box paper properties. .

5. The ink concentration adjustment and control system for printing according to claim 2, characterized in that, The determination of the ink density deficiency compensation parameter for each coordinate point cluster includes: denoting the ink density of each coordinate point cluster belonging to the standard grayscale outline of the QR code pre-printed pattern as... , This indicates the number of each coordinate point cluster. ; Set the weight coefficient matrix corresponding to the characteristics of cigarette box paper. Determine the ink concentration deficiency compensation parameters for each coordinate point cluster. ; e represents the natural constant.

6. The ink concentration adjustment and control system for printing according to claim 5, characterized in that, The method for obtaining the visual effect difference is as follows: After the cigarette box post-processing operation, the QR code lamination pattern is obtained; based on the ink density of each coordinate point cluster belonging to the standard grayscale outline of the QR code pre-printed pattern, the actual ink printing density of each coordinate point cluster on the QR code lamination pattern is obtained similarly. ; The ink density of each coordinate point cluster belonging to the standard grayscale outline of the QR code pre-printed pattern is compared with the ink density of the corresponding coordinate point cluster on the QR code lamination pattern to determine the defect category number of the post-processing effect of the QR code lamination pattern. The post-processing effect defect categories include visual effect defect categories and adhesion effect defect categories, where... These represent the preset numbers belonging to the categories of no defects, visual effect defects, and adhesion effect defects, respectively. Represents any symbol, Indicates the identity sign. This means that when i takes any number They are all equal and The result is the difference that represents the identity. when At that time, the identical difference result is used as the numerator and compared with the preset reference difference result to obtain the color saturation difference of the QR code overlay pattern. ; The ink concentration of each coordinate point cluster on the QR code overlay pattern at a specific wavelength under different lighting conditions was measured, and the ratio between the ink concentration of each cluster and the ink concentration of the corresponding coordinate point cluster was obtained. Let be the transmittance of each coordinate point cluster on the QR code coating pattern at a specific wavelength under different lighting conditions. The standard deviation of the transmittance of the QR code coating pattern under different lighting conditions is calculated using the standard deviation formula. ; The visual effect difference of the QR code coated pattern is constructed by using the color saturation difference and transmittance standard deviation of the QR code coated pattern. .

7. The ink concentration adjustment and control system for printing according to claim 6, characterized in that, The adhesion effect difference at each ink adhesion defect point includes: when At the same time, the grayscale values ​​of each coordinate point on the QR code lamination pattern are obtained and compared with the standard grayscale values ​​of the corresponding coordinate points on the standard grayscale outline of the pre-printed QR code pattern on the cigarette box. The coordinate points where the grayscale values ​​do not match are recorded as the ink adhesion defect points of the QR code lamination pattern. Defects in ink adhesion include grayscale abrupt changes and smudging defects; Analyze the adhesion difference at various ink adhesion defect points ,in This indicates the preset reference grayscale difference value. This represents the preset grayscale baseline value for the bleed defect point. The standard grayscale outline of the pre-printed QR code pattern on the cigarette box The standard grayscale value of each coordinate point.

8. The ink concentration adjustment and control system for printing according to claim 1, characterized in that, The identification of printing ink defect attributes specifically involves: obtaining the corresponding standard threshold values ​​for the visual effect difference and adhesion effect difference of the pre-printed QR code pattern on the cigarette box. , Identify the defect attributes of printing ink ,in Indicates ink concentration defect. This indicates a defect in ink quality. Indicates the existence of a symbol.

9. A printing ink concentration adjustment and control system according to claim 1, characterized in that, The determination of supplementary parameters for ink concentration includes: detecting the ink concentration dilution rate of the QR code printed pattern on the cigarette box during the printing drying cycle and the lamination process cycle, respectively denoted as... ; Determine ink concentration supplementation parameters , These represent the weights of the concentration compensation effects for the preset printing drying and lamination processes, respectively. This indicates the concentration replenishment amount corresponding to the preset unit ink concentration defect coefficient; e represents the natural constant.

10. A printing ink concentration adjustment and control system according to claim 1, characterized in that, The determination of ink mixing parameters includes: detecting various flow characteristics of the current ink concentration using sensor instruments, including viscosity, surface tension, and ink particle size; comparing these values ​​with preset standard values ​​for the corresponding flow characteristics; calculating the difference; and then dividing by the corresponding preset reference difference value for each flow characteristic to obtain the actual flow uniformity of the current ink concentration. ; Adhesion effect difference based on each ink adhesion defect point Determine the ink mixing power , This indicates the preset unit adhesion effect evaluation coefficient and the corresponding stirring power. Based on this, the ink is stirred to ensure consistent ink concentration.

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