Ink concentration adjusting control system for printing

Abstract

The invention belongs to the technical field of ink concentration regulation and control for printing, and particularly discloses and provides an ink concentration regulation and control system for printing, which comprises the following steps of: determining an ink concentration deficient compensation parameter of actual two-dimensional code printing by detecting the ink concentration to which a standard gray contour of a cigarette case two-dimensional code preprinted pattern belongs and cigarette case paper characteristics; printed patterns and paper can be combined more tightly; the concentration defect and the quality defect occurring in the post-processing technology of the two-dimensional code are judged by comparing the ink concentration difference between the standard gray contour of the two-dimensional code film covering pattern and the standard gray contour of the pre-printed pattern, and the method comprises the steps that the visual effect difference of the two-dimensional code film covering pattern is evaluated by detecting the color saturation and the illumination transmittance of the two-dimensional code film covering pattern, and the quality defect of the two-dimensional code film covering pattern is judged. Regulating and controlling the ink concentration; and the quality of the ink is regulated and controlled by detecting the adhesion effect difference of each ink adhesion effect defect point. And it can be ensured that the follow-up printed two-dimensional code is kept consistent and high in quality in the visual effect and the attachment effect.

Description

Technical Field

[0001] The invention belongs to the technical field of printing ink concentration regulation and control, and relates to a printing ink concentration regulation and control system. Background Art

[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] Since the paper used for cigarette boxes usually contains some special properties to increase the service life of the cigarette boxes, these special papers have an obstructive effect on the ink printing of the QR code on the cigarette boxes. For example, coated paper and laser paper may pay more attention to the appearance display, but also require certain moisture-proof properties; white cardboard, due to its high strength, is more focused on protecting the integrity of the cigarette box, so it is necessary to adjust the ink concentration to prevent the problem of lack of pattern integrity during the printing process.

[0004] In the prior art, there are also some solutions related to the control of the concentration of printing ink. For example, the Chinese patent publication number CN117891169A discloses a printing ink concentration detection and control system, which can fully mix and stir the ink with concentrated ink or ink pigment and other materials by setting a stirring mechanism, so that the ink can be stirred more fully and more efficiently. After the preparation is completed, the lifting mechanism can drive the sampling mechanism to sample the equipment at different layers in the tank, so that the detection data can be more accurate.

[0005] Although the above scheme proposes some solutions for controlling the concentration of printing ink, there are still the following limitations: 1. The means for detecting ink concentration are limited, and often only focus on basic status indicators such as the uniformity and concentration of the ink itself, and cannot deeply understand the combination of ink at the microscopic level. This makes it difficult to determine the appropriate ink concentration without accurate basis, and it is difficult to achieve a close and perfect combination between the printed pattern and the attached object.

[0006] 2. There is a lack of information on the impact of post-processing technology on the printing quality of the QR code, as well as a lack of quantitative data on the subtle changes in ink concentration between the laminated pattern and the pre-printed pattern. As a result, it is impossible to promptly discover situations such as the dilution of ink concentration caused by glue overprinting during the lamination process, which makes the visual effect and adhesion effect of the final product uneven, and it is impossible to ensure that the subsequently printed QR code maintains consistent high quality in terms of visual effect and adhesion effect. Summary of the invention

[0007] In view of this, in order to solve the problems raised in the above background technology, a printing ink concentration adjustment control system is now proposed.

[0008] The objective of the present invention can be achieved through the following technical scheme: The present invention provides a printing ink concentration adjustment and control system, the system comprising: a cigarette box QR code pattern acquisition module, used to obtain the standard grayscale contour of the cigarette box QR code pre-printed pattern, and identify the ink concentration of each coordinate point cluster belonging to the standard grayscale contour.

[0009] The paper property detection module is used to detect the cigarette box paper properties, including material properties, surface properties, and gram weight properties, and obtain the adsorption condition matrix D of the cigarette box paper properties to the ink.

[0010] The ink concentration evaluation module is used to determine the ink concentration deficiency compensation parameters of 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 contour.

[0011] The post-processing process detection module is used to detect the post-processing process effect difference of the QR code printing operation, including the visual effect difference V and the adhesion effect difference U of each ink adhesion defect point. k , k represents the number of each ink adhesion defect point, k = 1, 2, ..., a.

[0012] The ink property correction module is used to identify the defective properties of printing ink, including ink concentration defect and ink quality defect. When the defective property of printing ink is ink concentration defect, the ink concentration supplement parameter is determined; when the defective property of printing ink is ink quality defect, the ink stirring 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 parameters of the actual printing of the QR code by detecting the ink concentration of each coordinate point cluster belonging to the standard grayscale contour of the pre-printed QR code pattern on the cigarette box and detecting the characteristics of the cigarette box paper. This can make the printed pattern and paper more closely combined, and to a certain extent enhance the moisture-proof and wear-resistant functions of the QR code on the cigarette box.

[0014] (2) The present invention can identify specific problems that occur in the post-processing process (such as lamination) of the two-dimensional code, including concentration defects and quality defects, by comparing the difference in ink concentration between the standard grayscale profile of the two-dimensional code lamination pattern and the pre-printed pattern. It can use it as an early warning mechanism to promptly discover the impact of defects in the post-processing process on ink concentration during the production process, which helps to avoid printing quality defects caused by these defects, thereby reducing the scrap rate of two-dimensional code printing.

[0015] (3) The present invention evaluates the visual effect difference of the two-dimensional code coating pattern by detecting the color saturation and light transmittance of the two-dimensional code coating pattern, thereby increasing the accuracy of ink concentration control precision; by detecting the adhesion effect difference of each ink adhesion defect point, the accuracy of ink quality control is increased, which helps to ensure that the subsequently printed two-dimensional code maintains consistent high quality in visual effect and adhesion effect, thereby improving the quality of the overall printed product. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the connection of the system modules of the present invention.

[0018] Figure 2 Schematic diagram of coordinate point clusters with different grayscale values ​​in the present invention.

[0019] Figure 3 It is a schematic diagram of the process flow for distinguishing defect categories of the post-processing process effect of the two-dimensional code coating pattern of the present invention.

[0020] Figure numerals: 1. Coordinate point. DETAILED DESCRIPTION

[0021] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

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

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

[0024] The cigarette box two-dimensional code pattern acquisition module is used to acquire the standard grayscale contour of the cigarette box two-dimensional code pre-printed pattern and identify the ink concentration of each coordinate point cluster belonging to the standard grayscale contour.

[0025] See also Figure 2 As shown, in a preferred embodiment, the ink concentration of each coordinate point cluster belonging to the identified standard grayscale contour includes the following contents: Since the QR code is a two-dimensional image structure in which each pixel has its position coordinate, any right-angled side of the QR code is used as the x-axis and y-axis of the two-dimensional coordinate system, and the standard grayscale value of each coordinate point on the standard grayscale contour of the pre-printed pattern of the QR code on the cigarette box is detected by contour recognition technology, and the standard grayscale values ​​are compared with each other to cluster the coordinate point clusters with different grayscale values.

[0026] The standard grayscale value of each coordinate point cluster is matched with the preset grayscale value corresponding to each ink concentration to obtain the ink concentration of each coordinate point cluster of the standard grayscale contour of the two-dimensional code pre-printed pattern.

[0027] The paper property detection module is used to detect the cigarette box paper properties, including material properties, surface properties, and gram weight properties, and obtain the adsorption condition matrix D of the cigarette box paper properties to ink.

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

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

[0030] The grammage characteristics include paper thinness and tensile strength.

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

[0032] Through adsorption experiments, the adhesion relationship table between the properties of various acidic and alkaline materials and the acidic and alkaline configured inks is detected, and then the adhesion m between the material properties of the cigarette box and the acidic and alkaline configured inks is extracted.

[0033] It should be noted that the relationship between the material properties of cigarette boxes and the acidity and alkalinity of the ink is more complicated. For example, acidic paper may reduce the adhesion between ink and paper, because the acidic environment may affect the surface properties of paper fibers, making it difficult for ink to adhere firmly to the paper; the surface properties of neutral paper are relatively mild, which is conducive to the adhesion of ink; however, the effect of alkaline paper on ink adhesion is more complicated. 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 and make the paper surface rough, thus affecting the uniform adhesion of the ink.

[0034] Tep2, the surface characteristics of the cigarette box paper corresponding to each element is recorded as R n , and obtain the surface characteristics of cigarette box paper and preset the appropriate intervals for each element Comparative determination of adsorption parameters for surface properties of cigarette boxes Among them, They represent symbols that belong to and symbols that do not belong to, respectively. n represents the element numbers corresponding to the surface characteristics of the paper used for cigarette boxes, and n=1, 2. For example, R1 represents the roughness element corresponding to the surface characteristics of the paper used for cigarette boxes, and R2 represents the water absorption element corresponding to the surface characteristics of the paper used for cigarette boxes.

[0035] It should be noted that regarding the surface characteristics: the rough paper surface has more microscopic concave-convex structures, which provide more adsorption sites for the ink. Therefore, the gaps between the fibers of the paper with high roughness are larger, which is conducive to the penetration of ink; however, due to the inconsistent degree of surface unevenness, the amount and speed of ink adsorption at different positions may be different. A paper surface that is too rough may also cause uneven ink adsorption.

[0036] Paper with insufficient water absorption cannot fully absorb ink, which will reduce the adhesion of ink on the paper surface; when the water absorption of paper is too high, the ink will easily smudge on the paper.

[0037] Tep3. Obtain the preset suitable intervals of the corresponding elements of the grammage characteristics of the paper used for cigarette boxes, compare the grammage characteristics of the paper used for cigarette boxes with them, and obtain the adsorption parameters based on the surface characteristics of the cigarette boxes. Similarly, determine the adsorption parameter w of the grammage characteristics of the cigarette boxes.

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

[0039] Paper with too low tensile strength is easy to deform during the ink adsorption process, such as wrinkling and tearing; paper with high tensile strength has tightly bound fibers, which may hinder the penetration of ink to a certain extent.

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

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

[0042] In a preferred embodiment, the ink concentration deficiency compensation parameter of each coordinate point cluster is determined, including: recording the ink concentration of each coordinate point cluster belonging to the standard grayscale contour of the two-dimensional code pre-printed pattern as C i , i represents the number of each coordinate point cluster, i = 1, 2, ..., n.

[0043] Set the corresponding weight coefficient matrix of cigarette box paper characteristics Determine the ink density deficiency compensation parameters for each coordinate point cluster ω1, ω2, and ω3 represent the corresponding weight coefficients of material properties, surface properties, and gram weight properties, respectively, and e represents a natural constant.

[0044] It should be noted that the weight coefficient matrix corresponding to the characteristics of the cigarette box paper is set based on the following: the difference in ink adhesion based on the material is the basis for clear and accurate QR code printing, so the weight of the material characteristics is relatively high, and the weight coefficient can be set to 0.4-0.5; the roughness and water absorption in the surface characteristics have a significant impact on the ink distribution, and the weight coefficient can be set to 0.3-0.4; the paper thinness and tensile strength in the grammage characteristics mainly indirectly affect the ink concentration by affecting the overall performance of the paper, and the weight coefficient can be set to 0.2-0.3. For example, ω1=0.4, ω2=0.4, ω3=0.2.

[0045] 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 belonging to the standard grayscale contour of the pre-printed pattern of the cigarette box QR code and detecting the characteristics of the cigarette box paper. This can make the printed pattern and paper more closely combined, and to a certain extent enhance the moisture-proof and wear-resistant functions of the cigarette box QR code.

[0046] The post-processing process detection module is used to detect the post-processing process effect difference of the two-dimensional code printing operation, including the visual effect difference V, the adhesion effect difference U of each ink adhesion defect point k , k represents the number of each ink adhesion defect point, k = 1, 2, ..., a.

[0047] The post-processing process includes film thickness, glue type, and varnish coating thickness.

[0048] See also Figure 3As shown, in a preferred embodiment, the visual effect difference is obtained by: obtaining the two-dimensional code coating pattern after the cigarette box post-processing process operation, based on the ink concentration of each coordinate point cluster belonging to the standard grayscale contour of the two-dimensional code pre-printed pattern, and similarly obtaining the actual printing concentration of ink of each coordinate point cluster on the two-dimensional code coating pattern.

[0049] Compare the ink density of each coordinate point cluster belonging to the standard grayscale contour of the QR code pre-printed pattern with the ink density of the corresponding coordinate point cluster on the QR code coating pattern to determine the defect category number of the post-processing process effect of the QR code coating pattern The post-processing process effect defect categories include visual effect defect categories and adhesion effect defect categories. In the formula, T1, T2, and T3 represent the preset numbers of no defect, visual effect defect category, and adhesion effect defect category, respectively. represents any symbol, ≡ represents the identity sign, Indicates that i takes any number are all equal and ΔC0 is the same difference result.

[0050] When T=T2, the constant difference result is used as a numerator and compared with the preset reference difference result to obtain the color saturation difference γ of the two-dimensional code coating pattern.

[0051] Measure the ink concentration of each coordinate point cluster on the QR code film pattern under different lighting conditions and at a specific wavelength Get the ratio between the ink density of the corresponding coordinate point cluster and the ink density of the corresponding coordinate point cluster Denote as the transmittance of a specific wavelength of each coordinate point cluster on the QR code film pattern under different lighting conditions, and calculate the standard deviation δ of the transmittance of the QR code film pattern under different lighting conditions by the standard deviation formula, where q represents the number of different lighting conditions, q=1, 2, ..., h.

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

[0053] The color saturation difference and transmittance standard deviation of the QR code coating pattern are constructed as the visual effect difference of the QR code coating pattern.

[0054] In a further preferred embodiment, the adhesion effect difference of each ink adhesion effect defect point includes: when T=T3, the gray value of each coordinate point on the two-dimensional code coating pattern is obtained, and it is compared with the standard gray value of the corresponding coordinate point on the standard gray contour of the pre-printed two-dimensional code pattern of the cigarette box, and the coordinate points with mismatched gray values ​​are obtained, which are recorded as each ink adhesion effect defect point T(x k ,yk ), ink adhesion effect defects such as grayscale jump points and blurring defects.

[0055] Analyze the difference in adhesion of each ink defect point Where ΔT represents the preset reference grayscale difference, T(x1,y1) represents the preset grayscale baseline value of the blooming defect point, and T′(x k ,y k ) represents the standard grayscale value of the kth coordinate point on the standard grayscale contour of the pre-printed pattern of the two-dimensional code on the cigarette box.

[0056] It should be noted that the grayscale jump point refers to a coordinate point position where there is ink but no ink after printing or the concentration of the existing ink does not meet the standard, and the blurring defect point refers to a coordinate point position where there is no ink but ink after printing or the concentration of the existing ink 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 ink concentration defects, the ink concentration supplement parameter is determined; when the printing ink defect property is ink quality defects, the ink stirring parameter is determined.

[0058] In a preferred embodiment, the identification of printing ink defect attributes is specifically: obtaining the visual effect difference and adhesion effect difference corresponding standard thresholds V' and U' of the pre-printed pattern of the two-dimensional code on the cigarette box, and identifying the printing ink defect attributes Con represents ink concentration defect, qua represents ink quality defect, Indicates the presence of a symbol.

[0059] In a further preferred embodiment, the determination of the ink concentration supplementary parameter includes: detecting the ink concentration dilution rate of the two-dimensional code printed pattern on the cigarette box during the printing drying cycle and the laminating process cycle, which are recorded as dry and film respectively.

[0060] It should be noted that the ink concentration dilution rate in the printing and drying cycle and the laminating process cycle refers to the degree to which the ink grayscale value of the two-dimensional code printing pattern becomes lighter at the corresponding start and end times of the printing and drying cycle and the laminating process cycle.

[0061] Determine ink concentration replenishment parameters β1 and β2 represent the influence weights of the preset concentration compensation of the printing drying and laminating processes, respectively. Indicates the preset unit ink concentration defect coefficient corresponding to the concentration replenishment amount.

[0062] In a further preferred embodiment, the ink stirring parameters are determined, including: detecting various flow characteristics of the current ink concentration, such as viscosity, surface tension, and ink particle size, by means of sensor instruments, comparing them one by one with preset standard values ​​of the corresponding flow characteristics, and then dividing them by the corresponding preset reference difference values ​​of the corresponding flow characteristics, and accumulating them to obtain the actual flow uniformity even of the current ink concentration.

[0063] Adhesion effect difference U based on each ink adhesion effect defect point k , determine the ink stirring power F0 represents the preset unit adhesion effect evaluation coefficient corresponding to the stirring demand power, and the ink is stirred accordingly to ensure the consistency of ink concentration.

[0064] By comparing the ink concentration difference between the standard grayscale profile of the QR code coating pattern and the pre-printed pattern, the present invention can identify specific problems occurring in the post-processing process (such as coating) of the QR code, including concentration defects and quality defects. This can be used as an early warning mechanism to promptly discover the effects of defects in the post-processing process on ink concentration during the production process, which helps to avoid printing quality defects caused by these defects, thereby reducing the scrap rate of QR code printing. For example, when the corresponding difference results of the ink concentration of all coordinate point clusters are equal, it means that the ink fluidity quality of the QR code printing pattern is relatively uniform but the overall concentration does not meet the standard. In the subsequent printing operation, it is necessary to adjust the ink concentration in a targeted manner to determine the type of visual effect defects in the post-processing process; when all coordinate point clusters are equal to the ink concentration of the corresponding coordinate point clusters on the standard contour, it is determined that the ink concentration and its quality have met the required conditions and no adjustment is required; when none of the above conditions are met, it means that there may be defects in the ink quality, such as falling off or smudging in some areas of the QR code, which affects the firmness of its bonding with the paper, and it is determined that there are adhesion defects in the post-processing process, and the ink quality needs to be adjusted.

[0065] At the same time, the present invention increases the accuracy of ink concentration control precision by detecting the color saturation and light transmittance of the QR code coating pattern to evaluate the visual effect difference of the QR code coating pattern; and increases the accuracy of ink quality control by detecting the adhesion effect difference of each ink adhesion defect point, which helps to ensure that the subsequently printed QR code maintains consistent high quality in visual effect and adhesion effect, thereby improving the quality of the overall printed product.

[0066] The above contents are merely examples and explanations of the concept of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the concept of the invention or exceed the scope defined by the present invention, they shall all fall within the protection scope of the present invention.

Claims

1. A printing ink concentration adjustment control system, characterized in that: include: A module for acquiring a QR code pattern for cigarette boxes, used to acquire a standard grayscale profile of a pre-printed QR code pattern on a cigarette box, and to identify the ink concentration of each coordinate point cluster to which the standard grayscale profile belongs; The paper property detection module is used to detect the properties of cigarette box paper, including material properties, surface properties, and gram weight properties, and obtain the adsorption condition matrix D of the cigarette box paper properties to the ink; The ink concentration evaluation module is used to determine the ink concentration deficiency compensation parameter of 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; The post-processing process detection module is used to detect the post-processing process effect difference of the QR code printing operation, including the visual effect difference V and the adhesion effect difference U of each ink adhesion defect point. k , k represents the number of each ink adhesion defect point, k = 1, 2, ..., a; The ink property correction module is used to identify the defective properties of printing ink, including ink concentration defect and ink quality defect. When the defective property of printing ink is ink concentration defect, the ink concentration supplement parameter is determined; when the defective property of printing ink is ink quality defect, the ink stirring parameter is determined.

2. A printing ink concentration adjustment and control system according to claim 1, characterized in that: The ink concentration of each coordinate point cluster belonging to the standard grayscale contour of the identification includes: since the two-dimensional code is a two-dimensional image structure, each pixel point has its position coordinate, so any right-angle side of the two-dimensional code is used as the x-axis and y-axis of the two-dimensional coordinate system, the standard grayscale value of each coordinate point on the standard grayscale contour of the pre-printed pattern of the two-dimensional code of the cigarette box is detected by contour recognition technology, and the standard grayscale values ​​are compared with each other to cluster the coordinate point clusters with different grayscale values; The standard grayscale value of each coordinate point cluster is matched with the preset grayscale value corresponding to each ink concentration to obtain the ink concentration of each coordinate point cluster of the standard grayscale contour of the two-dimensional code pre-printed pattern.

3. A printing ink concentration adjustment and control system according to claim 1, characterized in that: The material properties include coated paper, white cardboard, laser paper; The surface characteristics such as roughness and water absorption; The grammage characteristics include paper thinness and tensile strength.

4. A printing ink concentration adjustment and control system according to claim 1, characterized in that: The condition matrix for obtaining the ink adsorption property of cigarette box paper includes: Tep1, obtain the corresponding acidity and alkalinity of the material characteristics of the cigarette box, and obtain the acidity and alkalinity of the configuration ink of the pre-printed pattern of the QR code on the cigarette box; Through adsorption experiments, the adhesion relationship table between the properties of various acidic and alkaline materials and the acidic and alkaline inks is detected, and then the adhesion m between the properties of the cigarette box material and the acidic and alkaline inks is extracted; Tep2, the surface characteristics of the cigarette box paper corresponding to each element is recorded as R n , and obtain the surface characteristics of cigarette box paper and preset the appropriate intervals for each element Comparative determination of adsorption parameters for surface properties of cigarette boxes Among them, They represent belonging symbols and not belonging symbols respectively, n represents the numbers of the elements corresponding to the surface characteristics of the paper used for cigarette boxes, n=1, 2, such as R1 represents the roughness element corresponding to the surface characteristics of the paper used for cigarette boxes, R2 represents the water absorption element corresponding to the surface characteristics of the paper used for cigarette boxes; Tep3, obtain the preset suitable intervals of each element corresponding to the grammage characteristics of the paper for cigarette boxes, compare the grammage characteristics of the paper for cigarette boxes with it, and determine the adsorption parameter w of the grammage characteristics of the paper for cigarette boxes based on the adsorption parameter acquisition method of the surface characteristics of the cigarette boxes; Te4. Obtain the ink adsorption condition matrix D = [msw] of cigarette box paper.

5. A printing ink concentration adjustment and control system according to claim 2, characterized in that: The content of determining the ink density deficiency compensation parameter of each coordinate point cluster includes: recording the ink density of each coordinate point cluster belonging to the standard grayscale contour of the two-dimensional code pre-printed pattern as C i , i represents the number of each coordinate point cluster, i = 1, 2, ..., n; Set the corresponding weight coefficient matrix ω of the cigarette box paper characteristics to determine the ink concentration deficiency compensation parameters of each coordinate point cluster 6. A printing ink concentration adjustment and control system according to claim 5, characterized in that: The visual effect difference is obtained by obtaining the two-dimensional code coating pattern after the cigarette box post-processing process, and obtaining the ink concentration of each coordinate point cluster belonging to the standard grayscale contour of the two-dimensional code pre-printed pattern. Similarly, the actual printing concentration of ink of each coordinate point cluster on the two-dimensional code coating pattern is obtained. Compare the ink density of each coordinate point cluster belonging to the standard grayscale contour of the QR code pre-printed pattern with the ink density of the corresponding coordinate point cluster on the QR code coating pattern to determine the defect category number of the post-processing process effect of the QR code coating pattern The post-processing process effect defect categories include visual effect defect categories and adhesion effect defect categories. In the formula, T1, T2, and T3 represent the preset numbers of no defect, visual effect defect category, and adhesion effect defect category, respectively. represents any symbol, ≡ represents the identity sign, Indicates that i takes any number They are all equal and ΔC0 is the same difference result; When T=T2, the constant difference result is used as a numerator and compared with the preset reference difference result to obtain the color saturation difference γ of the two-dimensional code coating pattern; Measure the ink concentration of each coordinate point cluster on the QR code film pattern at a specific wavelength under different lighting conditions, and obtain the ratio between it and the ink concentration of the corresponding coordinate point cluster Denote as the transmittance of a specific wavelength at each coordinate point cluster on the QR code film pattern under different lighting conditions, and calculate the transmittance standard deviation δ of the QR code film pattern under different lighting conditions by the standard deviation formula; The color saturation difference and transmittance standard deviation of the QR code coating pattern are constructed as the visual effect difference of the QR code coating pattern.

7. A printing ink concentration adjustment and control system according to claim 6, characterized in that: The difference in adhesion effect of each ink adhesion defect point includes: When T=T3, the grayscale value of each coordinate point on the QR code coating pattern is obtained, and it is compared with the standard grayscale value of the corresponding coordinate point on the standard grayscale contour of the pre-printed QR code pattern of the cigarette box, and the coordinate points with mismatched grayscale values ​​are obtained, which are recorded as the ink adhesion defect points T(x k ,y k ), ink adhesion defect points such as grayscale jump points and blooming defect points; Analyze the difference in adhesion of each ink defect point Where ΔT represents the preset reference grayscale difference, T(x1,y1) represents the preset grayscale baseline value of the blooming defect point, and T′(x k ,y k ) represents the standard grayscale value of the kth coordinate point on the standard grayscale contour of the pre-printed pattern of the two-dimensional code on the cigarette box.

8. The printing ink concentration adjustment and control system according to claim 1, characterized in that: The identification of printing ink defect attributes is specifically as follows: obtaining the visual effect difference and adhesion effect difference corresponding standard thresholds V′ and U′ of the pre-printed pattern of the two-dimensional code on the cigarette box, and identifying the printing ink defect attributes Con represents ink concentration defect, qua represents ink quality defect, Indicates the presence of a symbol.

9. A printing ink concentration adjustment and control system according to claim 1, characterized in that: The determination of the ink concentration supplementary parameter includes: detecting the ink concentration dilution rate of the two-dimensional code printed pattern of the cigarette box in the printing drying cycle and the laminating process cycle, which are recorded as dry and film respectively; Determine ink concentration replenishment parameters β1 and β2 represent the influence weights of the preset concentration compensation of the printing drying and laminating processes, respectively. Indicates the preset unit ink concentration defect coefficient corresponding to the concentration replenishment amount.

10. The printing ink concentration adjustment and control system according to claim 1, characterized in that: The determination of the ink stirring parameters includes: detecting various flow characteristics of the current ink concentration, such as viscosity, surface tension, and ink particle size, by using a sensor instrument, comparing and subtracting the flow characteristics with preset standard values ​​of the corresponding flow characteristics, and then dividing the difference by the preset reference difference of the corresponding flow characteristics, and accumulating to obtain the actual flow uniformity even of the current ink concentration; Adhesion effect difference U based on each ink adhesion defect point k , determine the ink stirring power F0 represents the preset unit adhesion effect evaluation coefficient corresponding to the stirring demand power, and the ink is stirred accordingly to ensure the consistency of ink concentration.

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