Packaging box printing image defect detection method

Abstract

The invention relates to the technical field of packaging box defect detection, in particular to a packaging box printing image defect detection method, which comprises the following steps: detecting the actual contour of a printing image and the image information of the thickness of each point position by using a detection module; establishing a coordinate system according to the image information by using a test module, marking a plurality of test points for the coordinate system according to a database, and testing the hardness of the packaging box for each test point; an analysis module judges the coining qualification of the printed image according to the actual contour of the printed image, judges the reason for the unqualified coining of the printed image according to the offset of the adjacent test points, and determines whether the coining of the printed image is qualified or not according to the reason; and the adjusting module is used for adjusting the corresponding position for judging whether the printed image coining is qualified or not according to the adjusting mode determined by the analysis module, so that the problems that a printed image packaging box produced in the prior art is insufficient in hardness, and the image is prone to deformation are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of packaging box defect detection, and in particular to a packaging box printed image defect detection method. Background Art

[0002] Embossing, packaging and testing are important links in the process of product manufacturing and quality control. Embossing is a process of transferring patterns or texts to the surface of materials through pressure, and is often used in packaging, printed materials and souvenirs.

[0003] Chinese patent publication number CN116309337A discloses a packaging box quality inspection system based on image recognition, which belongs to the field of intelligent manufacturing technology. The packaging box quality inspection system utilizes the fact that due to the influence of factors such as processes and machines during printing, the areas where bad dots appear are relatively concentrated and show a more obvious regularity. The top and side images of the obtained packaging box are segmented, and the segmented parts are analyzed and processed in turn according to the size and difference of the bad dot areas. If a bad dot area appears or the difference between the bad dot areas is large during the analysis process, no subsequent analysis will be performed. Therefore, there is no need to analyze and process the entire image, which can effectively and significantly reduce the amount of calculation and improve the quality inspection efficiency of the packaging box.

[0004] Obviously, the existing technology lacks means to control the coating flow rate and ambient temperature during the printing process, which may lead to problems such as easy damage or deformation of the printed image. Summary of the invention

[0005] To this end, the present invention provides a packaging box printed image defect detection method to overcome the problem that the prior art lacks control means for the coating flow rate and ambient temperature during the printing process, which may cause the printed image to be easily damaged or deformed.

[0006] To achieve the above object, the present invention provides a packaging box printing image defect detection method, comprising:

[0007] Using the detection module to detect the image information of the actual contour of the printed image and the thickness of each point;

[0008] Using a test module to establish a coordinate system according to the image information and mark a number of test points on the coordinate system according to a database, and perform a packaging box hardness test on each of the test points;

[0009] The analysis module determines the eligibility of the printed image embossing according to the actual contour of the printed image and determines the cause of the unqualified printed image embossing according to the offset of adjacent test points, and determines the adjustment mode of the printed image embossing device according to the cause;

[0010] The regulating module is used to adjust the operating parameters of the corresponding positions of the printing image imprinting device according to the regulating mode determined by the analyzing module.

[0011] Furthermore, the analysis module determines whether the printed image embossing is qualified based on the overlap ratio between the actual contour of the printed image obtained by the detection module and the preset contour, and performs a packaging box hardness test when it is determined that the overlap ratio meets the preset standard. When it is preliminarily determined that the overlap ratio does not meet the preset standard, a secondary determination is made on the printed image packaging box hardness based on the distribution of the contour of the non-overlapping part. When it is determined that the overlap ratio does not meet the preset standard, the reason for the unqualified printed image embossing is determined.

[0012] Furthermore, the analysis module determines that the printed image is qualified for embossing when it is determined that the overlap ratio between the actual contour of the printed image and the preset contour meets the preset standard, and sends a notification of performing a packaging box hardness test to the test module. The test module establishes a coordinate system based on the image information obtained by the detection module and marks a number of test points on the coordinate system based on the database. After the marking is completed, a pressure test is performed on the printed image. The analysis module determines the hardness of the printed image packaging box based on the offset of the coordinates of each test point in the pressure test, wherein:

[0013] The analysis module determines that the hardness of the printed image packaging box is qualified when it is determined that the offset of the test point coordinates meets the preset standard; the analysis module performs a secondary judgment on the hardness of the printed image packaging box based on the offset of adjacent test points when it is preliminarily determined that the offset of the test point coordinates does not meet the preset standard; the analysis module is used to determine the reason why the hardness of the printed image packaging box is unqualified when it is determined that the offset of the test point coordinates does not meet the preset standard.

[0014] Furthermore, when the analysis module preliminarily determines that the offset of the test point does not meet the preset standard, the analysis module performs a secondary determination on the hardness of the packaging box at the test point based on the offset of the adjacent test point, wherein:

[0015] If the offset of the adjacent test points of the test point does not meet the preset standard, the hardness of the packaging box at the test point is determined to be qualified, and the reason why the hardness of the packaging box at the adjacent test point is unqualified is determined; if the offset of the adjacent test points of the test point meets the preset standard, the hardness of the packaging box at the test point is determined to be unqualified, and the reason why the hardness of the packaging box at the test point is unqualified is determined.

[0016] Furthermore, when it is determined that the test point offset does not meet the preset standard, the analysis module determines the reason why the hardness of the printed image packaging box is unqualified based on the difference between the thickness of each test point of the printed image obtained by the detection module and the preset thickness, wherein:

[0017] If the difference between the thickness of the test point and the preset thickness meets the preset difference standard, it is determined that the reason why the hardness of the printed image packaging box is unqualified is that there are bubbles in the side wall of the image during the printing process; if the difference between the thickness of the test point and the preset thickness does not meet the preset difference standard, it is determined that the coating flow rate during the printing process of the printed image does not meet the preset standard.

[0018] Furthermore, when the analysis module determines that the difference between the thickness of the test point and the preset thickness meets the preset difference standard, based on the proportion of test points whose test point offsets do not meet the standard in all test points, several imprinting methods for the imprinting device in the printing image imprinting process are set, and the imprinting amplitude for the imprinting device under each imprinting method is different.

[0019] Furthermore, the analysis module is used to set several flow rate adjustment methods for the paint flow rate based on the difference between the thickness of the test point and the preset thickness when it is determined that the difference between the thickness of the test point and the preset thickness does not meet the preset difference standard, and the adjustment range of the paint flow rate under each flow rate adjustment method is different.

[0020] Furthermore, the analysis module is used to calculate the corresponding variance of the distance difference between the actual contour and the preset contour of each point of the non-overlapping part of the contour when it is preliminarily determined that the overlap ratio between the actual contour of the printed image and the preset contour does not meet the preset standard, and perform a secondary determination on whether the printed image is qualified based on the variance, wherein:

[0021] The analysis module determines that the non-overlapping portion is dispersed and the printed image is qualified for embossing when the corresponding variance of the distance difference between the actual contour of each point position of the non-overlapping portion of the contour and the preset contour meets the preset variance standard; the analysis module determines that the non-overlapping portion is concentrated and the printed image is unqualified for embossing when the corresponding variance of the distance difference between the actual contour of each point position of the non-overlapping portion of the contour and the preset contour does not meet the preset variance standard, and the analysis module determines the cause of the unqualified embossing according to the difference between the overlap ratio of the actual contour of the printed image and the preset contour and the preset ratio.

[0022] Further, the analysis module is used to determine the cause of unqualified printing of the printed image based on the difference between the overlap ratio of the actual outline of the printed image and the preset outline and the preset ratio when it is determined that the overlap ratio of the actual outline of the printed image and the preset outline does not meet the preset standard, wherein:

[0023] If the difference between the overlap ratio of the actual contour of the printed image and the preset contour and the preset ratio is qualified, it is determined that the reason for the unqualified printing of the printed image is that the ambient temperature is too low during the printing process, causing the paint to solidify too quickly and the paint surface is uneven; if the overlap ratio of the actual contour of the printed image and the preset contour and the preset ratio is unqualified, it is determined that the reason for the unqualified printing of the printed image is that the paint flow rate is unstable during the printing process.

[0024] Furthermore, the analysis module is used to set several temperature adjustment methods for the ambient temperature during the printing process of the printed image based on the difference between the overlap ratio and the preset ratio when it is determined that the overlap ratio between the actual contour of the printed image and the preset contour is qualified, and the temperature adjustment range is different under each adjustment method.

[0025] Compared with the prior art, the beneficial effect of the present invention lies in that the analysis module in the present invention determines whether the printed image is qualified based on the overlap ratio between the actual contour of the printed image obtained by the detection module and the preset contour, and performs a packaging box hardness test when it is determined that the overlap ratio meets the preset standard. When it is preliminarily determined that the overlap ratio does not meet the preset standard, a secondary judgment is performed based on the distribution of the contour of the overlapping part. When it is determined that the overlap ratio does not meet the preset standard, the reason for the unqualified printing of the printed image is determined, thereby improving the accuracy of determining whether the printed image is qualified, reducing the interference of environmental factors on the production quality of the printed image during the printing process, and improving the quality of the produced printed image.

[0026] Furthermore, the analysis module determines that the shape of the printed image contour is qualified when the overlap ratio between the actual contour of the printed image and the preset contour is qualified, and sends a notification to the test module to perform a packaging box hardness test. The test module establishes a coordinate system based on the image information obtained by the detection module and marks a number of test points on the coordinate system based on the database. After the marking is completed, a pressure test is performed on the printed image, which further improves the accuracy of determining whether the printed image is qualified, reduces the interference of environmental factors on the production quality of the printed image during the printing process, can accurately produce the specific location of the unqualified product, and provides convenience for subsequent problem solving.

[0027] Furthermore, the analysis module determines that the hardness of the printed image packaging box is qualified when it is determined that the test point offset meets the preset standard; the analysis module is used to perform a secondary judgment on the hardness of the printed image packaging box based on the offset of the adjacent test points when it is preliminarily determined that the test point offset does not meet the preset standard; the analysis module is used to determine the reason for the unqualified hardness of the printed image packaging box when it is determined that the test point offset does not meet the preset standard, further improving the accuracy of determining whether the printed image imprinting is qualified, reducing the interference of environmental factors on the printed image production quality during the printed image imprinting process, and being able to accurately produce the specific location of the unqualified product, providing convenience for subsequent problem solving.

[0028] Furthermore, the analysis module performs a secondary determination on the hardness of the printed image packaging box at the test point based on the offset of the adjacent test point when it is preliminarily determined that the offset of the test point does not meet the preset standard. If the offset of the adjacent test point of the test point does not meet the preset standard, the hardness of the packaging box at the test point is determined to be qualified, and the reason for the unqualified hardness of the packaging box at the adjacent test point is determined; if the offset of the adjacent test point of the test point meets the preset standard, the hardness of the packaging box at the test point is determined to be unqualified, and the reason for the unqualified hardness of the packaging box at the test point is determined, thereby further improving the determination accuracy of whether the printed image embossing is qualified, reducing the interference of environmental factors on the printed image production quality during the printed image embossing process, and improving the quality of the produced printed images.

[0029] Furthermore, when the analysis module determines that the offset of the test point does not meet the preset standard, the analysis module determines the reason for the unqualified hardness of the printed image packaging box based on the difference between the thickness of each test point of the printed image obtained by the detection module and the preset thickness. If the difference between the thickness of the test point and the preset thickness meets the preset difference standard, it is determined that there are bubbles in the printed image bottle body during the printing process; if the difference between the thickness of the test point and the preset thickness does not meet the preset difference standard, it is determined that the coating flow rate during the printing process of the printed image does not meet the standard, which further improves the accuracy of determining whether the printing of the printed image is qualified, reduces the interference of environmental factors on the production quality of the printed image during the printing process of the printed image, can accurately produce the specific location of the unqualified, and provides convenience for subsequent problem solving.

[0030] Furthermore, when the analysis module determines that the difference between the thickness of the test point and the preset thickness meets the preset difference standard, the analysis module sets several imprinting modes for the imprinting equipment in the printing image imprinting process based on the proportion of test points whose test point offsets do not meet the standard in all test points, thereby further improving the accuracy of determining whether the printed image imprinting is qualified, reducing the interference of environmental factors on the printed image production quality during the printed image imprinting process, and improving the quality of the produced printed images.

[0031] Furthermore, when the analysis module determines that the difference between the thickness of the test point and the preset thickness does not meet the preset difference standard, a number of flow rate adjustment methods for the coating flow rate are provided based on the difference between the thickness of the test point and the preset thickness, thereby further improving the accuracy of determining whether the printed image is qualified, reducing the interference of environmental factors on the production quality of the printed image during the printing process of the printed image, and improving the quality of the produced printed image.

[0032] Furthermore, the analysis module calculates the corresponding variance of the distance difference between the actual contour of each point position of the non-overlapping part and the preset contour when it preliminarily determines that the overlap ratio between the actual contour and the preset contour is unqualified, and makes a secondary judgment on whether the printed image is qualified for embossing based on the variance. When it is determined that the corresponding variance of the distance difference between the actual contour of each point position of the non-overlapping part and the preset contour meets the preset variance standard, it is determined that the non-overlapping part is dispersedly distributed and the printed image is qualified for embossing; when it is determined that the corresponding variance of the distance difference between the actual contour of each point position of the non-overlapping part and the preset contour does not meet the preset variance standard, it is determined that the non-overlapping part is concentratedly distributed and the printed image is unqualified for embossing, which further improves the accuracy of determining whether the printed image is qualified for embossing, reduces the interference of environmental factors on the production quality of the printed image during the printing process of the printed image, and improves the quality of the produced printed image.

[0033] Furthermore, when the analysis module determines that the difference between the overlap ratio of the actual contour of the printed image and the preset contour and the preset ratio is qualified, the analysis module provides several temperature adjustment methods for the ambient temperature during the printing process of the printed image based on the difference between the overlap ratio and the preset ratio, thereby further improving the accuracy of determining whether the printing of the printed image is qualified, reducing the interference of environmental factors on the production quality of the printed image during the printing process of the printed image, and improving the quality of the produced printed image. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a flow chart of a method for detecting printing image defects on a packaging box according to an embodiment of the present invention;

[0035] Figure 2 FIG. 4 is a determination flow chart of a pressed image test according to an embodiment of the present invention. DETAILED DESCRIPTION

[0036] In order to make the objects and advantages of the present invention more clearly understood, the present invention is further described below in conjunction with embodiments; it should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0037] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0038] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings. This is only for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be understood as a limitation on the present invention.

[0039] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0040] See also Figure 1 As shown, it is a flow chart of a method for detecting printing image defects on a packaging box according to an embodiment of the present invention;

[0041] The method for detecting printed image defects on a packaging box according to an embodiment of the present invention comprises:

[0042] Step S1, using a detection module to detect image information of the actual contour of the printed image and the thickness of each point;

[0043] Step S2, using a test module to establish a coordinate system according to the image information, marking a number of test points on the coordinate system according to a database, and performing a packaging box hardness test on each of the test points;

[0044] Step S3, determining the eligibility of the printed image embossing according to the actual contour of the printed image through the analysis module and determining the cause of the unqualified printed image embossing according to the offset of adjacent test points, and determining the adjustment mode of the printed image embossing device according to the cause;

[0045] Step S4: using the adjustment module to adjust the operating parameters of the corresponding position of the printing image imprinting device according to the adjustment mode determined by the analysis module.

[0046] Specifically, when the analysis module determines the eligibility of the printed image embossing according to the actual contour of the printed image, the overlap ratio of the actual contour of the printed image obtained by the detection module and the preset contour is compared to determine the determination method of the eligibility of the printed image embossing;

[0047] Among them, the first determination method is that the analysis module determines that the overlap ratio between the actual contour of the printed image and the preset contour meets the preset ratio standard, and the testing module performs a packaging box hardness test; the first determination method satisfies that the overlap ratio between the actual contour of the printed image and the preset contour is greater than or equal to the first preset ratio, and the first preset ratio S1 is set to 90%;

[0048] The second determination method is that the analysis module preliminarily determines that the overlap ratio between the actual contour of the printed image and the preset contour does not meet the preset ratio standard, and the analysis module performs a secondary determination based on the distribution of the contour of the non-overlapping portion; the second determination method satisfies that the overlap ratio between the actual contour of the printed image and the preset contour is less than the first preset ratio and greater than or equal to the second preset ratio, and the second preset ratio S2 is set to 75%;

[0049] The third judgment method is that the analysis module determines that the overlap ratio between the actual contour and the preset contour of the printed image does not meet the preset ratio standard, and the analysis module determines the reason for the unqualified printing of the printed image; the third judgment method satisfies that the overlap ratio between the actual contour and the preset contour of the printed image is less than the second preset ratio.

[0050] Specifically, the analysis module determines that the shape of the printed image contour is qualified when it determines that the overlap ratio between the actual contour of the printed image and the preset contour is qualified, and sends a notification of performing a packaging box hardness test to the test module. The test module establishes a coordinate system according to the image information obtained by the detection module and marks the test points on the coordinate system according to the vulnerable positions of the printed image in the database. After the marking is completed, a pressure test is performed on the printed image. The analysis module determines a method for determining the hardness of the printed image packaging box according to the offset of the coordinates of each test point in the pressure test.

[0051] Among them, the first packaging box hardness determination method is that the analysis module determines that the test point offset meets the preset offset standard, and determines that the hardness of the packaging box at the test point is qualified; the first packaging box hardness determination method satisfies that the test point offset is less than or equal to the first preset offset, and the first preset offset L1 is set to 3mm;

[0052] The second packaging box hardness determination method is that the analysis module preliminarily determines that the test point offset does not meet the preset offset standard, and the analysis module performs a secondary determination on the hardness of the printed image packaging box according to the offset of the adjacent test point; the second packaging box hardness determination method satisfies that the test point offset is greater than the first preset offset and less than or equal to the second preset offset, and the second preset offset L2 is set to 5mm;

[0053] The third packaging box hardness determination method is that the analysis module determines that the test point offset does not meet the preset offset standard, and the analysis module determines the reason why the hardness of the printed image packaging box is unqualified; the third packaging box hardness determination method satisfies that the test point offset is greater than the second preset offset.

[0054] Specifically, when determining that the offset of the test point satisfies the second packaging box hardness determination method, the analysis module performs a secondary determination on the packaging box hardness of the printed image of the test point according to the offset of the adjacent test point;

[0055] Among them, the first packaging box hardness secondary determination method is that the analysis module determines that the offset of the adjacent test points does not meet the preset offset standard, determines that the hardness of the packaging box at the current test point is qualified, and determines the reason why the hardness of the packaging box at the adjacent test point is unqualified; the first packaging box hardness secondary determination method satisfies that the offset of the adjacent test points is less than or equal to the first preset offset;

[0056] The second secondary determination method for the hardness of the packaging box is that the analysis module determines that the offset of the adjacent test points meets the preset offset standard, determines that the hardness of the packaging box at this test point is unqualified, and determines the reason why the hardness of the packaging box at this test point is unqualified; the second secondary determination method for the hardness of the packaging box satisfies that the offset of the adjacent test points is greater than the first preset offset.

[0057] See also Figure 2 As shown, it is a determination flow chart of the pressing image test according to an embodiment of the present invention:

[0058] In the figure, first press the image to determine several positions that can be pressed, and mark each point as a test point. When a press test is performed with any test point as the actual measurement point:

[0059] If it meets the preset offset, the measured point is judged to be qualified;

[0060] If it does not meet the preset offset, a second determination is made on the measured point to determine whether the measured point is qualified;

[0061] The method for secondary determination of the measured points is:

[0062] Select any test point adjacent to the measured point as a verification point and press:

[0063] If the verification point meets the preset offset, the test point is judged to be unqualified;

[0064] If the verification point does not meet the preset offset, it is determined that the reason why the actual measured point does not meet the preset offset is that the hardness of the packaging box around the actual measured point is insufficient, and the actual measured point is determined to be qualified. Specifically, when determining that the offset of the test point does not meet the preset offset standard, the analysis module determines the reason why the hardness of the printed image packaging box is unqualified based on the difference between the thickness of each test point of the printed image obtained by the detection module and the preset thickness;

[0065] The first cause determination method is that the analysis module determines that the difference between the thickness of the test point and the preset thickness meets the preset difference standard, and determines that there are bubbles in the image side wall during the printing image embossing process; the first cause determination method satisfies that the difference between the thickness of the test point and the preset thickness is less than the preset difference, and the preset difference is set to 2mm;

[0066] The second cause determination method is that the analysis module determines that the difference between the thickness of the test point and the preset thickness does not meet the preset difference standard, and determines that the coating flow rate is too low during the printing image imprinting process; the second cause determination method satisfies that the difference between the thickness of the test point and the preset thickness is not less than the preset difference.

[0067] Specifically, when determining that the difference between the thickness of the test point and the preset thickness meets the preset difference standard, the analysis module determines the imprinting mode of the imprinting device in the imprinting process of the printed image according to the proportion of the test points whose test point offsets do not meet the standard in all the test points;

[0068] Among them, the first imprinting mode is that the analysis module determines that the proportion of the test points whose offset does not meet the standard in all the test points meets the preset proportion standard, and determines that 0.02MPa is imprinted during the imprinting process of the printed image; the first imprinting mode satisfies that the proportion of the test points whose offset does not meet the standard in all the test points is less than or equal to the first preset proportion, and the first preset proportion is set to 10%;

[0069] The second imprinting mode is that the analysis module preliminarily determines that the proportion of the test points whose offset does not meet the standard in all the test points does not meet the preset proportion standard, and determines that 0.04MPa is imprinted during the imprinting process of the printed image; the second imprinting mode satisfies that the proportion of the test points whose offset does not meet the standard in all the test points is greater than the first preset proportion and less than or equal to the second preset proportion, and the second preset proportion is set to 20%;

[0070] The third imprinting method is that the analysis module determines that the proportion of test points whose offset does not meet the standard in all test points does not meet the preset proportion standard, and determines that 0.06MPa is imprinted during the imprinting process of the printed image; the third imprinting method satisfies that the proportion of test points whose offset does not meet the standard in all test points is greater than the second preset proportion.

[0071] Specifically, the analysis module determines a plurality of flow rate adjustment modes for the coating flow rate according to the difference between the thickness of the test point and the preset thickness when it is determined that the difference between the thickness of the test point and the preset thickness does not meet the preset difference standard;

[0072] Among them, the first flow rate adjustment method is that the analysis module determines that the difference between the thickness of the test point and the preset thickness meets the preset thickness difference standard, and determines to adopt the first flow rate adjustment coefficient to adjust the coating flow rate; the first flow rate adjustment method satisfies that the difference between the thickness of the test point and the preset thickness is less than or equal to the first preset thickness difference, the first preset thickness difference is set to 0.3mm, and the first flow rate adjustment coefficient is set to 1.1. After adjustment by the first flow rate adjustment coefficient, the coating flow rate becomes 1.1 times the initial flow rate;

[0073] The second flow rate adjustment mode is that the analysis module preliminarily determines that the difference between the thickness of the test point and the preset thickness does not meet the preset thickness difference standard, and determines to use the second flow rate adjustment coefficient to adjust the coating flow rate; the second flow rate adjustment mode satisfies that the difference between the thickness of the test point and the preset thickness is greater than the first preset thickness difference and less than or equal to the second preset thickness difference, the second preset thickness difference is set to 0.6mm, and the second flow rate adjustment coefficient is set to 1.2. After adjustment by the second flow rate adjustment coefficient, the coating flow rate becomes 1.2 times the initial flow rate;

[0074] The third flow rate adjustment method is that the analysis module determines that the difference between the thickness of the test point and the preset thickness does not meet the preset thickness difference standard, and determines to adopt the third flow rate adjustment coefficient to adjust the coating flow rate; the third flow rate adjustment method satisfies that the difference between the thickness of the test point and the preset thickness is greater than the second preset thickness difference, and sets the third flow rate adjustment coefficient to 1.3. After adjustment by the third flow rate adjustment coefficient, the coating flow rate becomes 1.3 times the initial flow rate.

[0075] Specifically, when determining that the overlap ratio between the actual contour of the printed image and the preset contour satisfies the second determination method, the analysis module calculates the corresponding variance of the distance difference between the actual contour of each point position of the non-overlapping portion and the preset contour, and provides a secondary determination method for whether the printed image is qualified according to the contour variance;

[0076] Among them, the second one-time determination method is that the analysis module determines that the corresponding variance of the distance difference between the actual contour of each point of the non-overlapping part of the contour and the preset contour meets the preset variance standard, and determines that the non-overlapping part is dispersed and the printed image is qualified; the second one-time determination method satisfies that the contour variance is less than or equal to the preset variance, and the preset variance is set to 12;

[0077] The second secondary judgment method is that the analysis module determines that the corresponding variance of the distance difference between the actual contour of each point of the non-overlapping part of the contour and the preset contour does not meet the preset variance standard, and determines that the non-overlapping part is concentrated and the printed image is unqualified; the second secondary judgment method satisfies that the contour variance is greater than the preset variance.

[0078] Specifically, the analysis module determines the reason for the unqualified printing of the printed image according to the difference between the overlap ratio of the actual contour of the printed image and the preset contour and the preset ratio when determining that the overlap ratio of the actual contour of the printed image and the preset contour satisfies the third determination method, or when determining that the corresponding variance of the distance difference between the actual contour of each point of the non-overlapping part of the contour and the preset contour satisfies the second secondary determination method;

[0079] Among them, the first cause determination method is that the analysis module determines that the difference between the overlap ratio of the actual contour of the printed image and the preset contour and the preset ratio meets the preset ratio difference standard, and determines that the reason for the unqualified printing of the printed image is that the ambient temperature is too low during the printing process, resulting in the paint solidifying too quickly and the paint surface is uneven; the first cause determination method satisfies that the difference between the overlap ratio of the actual contour of the printed image and the preset contour and the preset ratio is less than the preset ratio difference, and the preset ratio difference is set to 0.05;

[0080] The second cause determination method is that the analysis module determines that the difference between the overlap ratio of the actual contour of the printed image and the preset contour and the preset ratio does not meet the preset ratio difference standard, and determines that the coating flow rate is unstable during the printing process of the printed image; the second cause determination method satisfies that the difference between the overlap ratio of the actual contour of the printed image and the preset contour and the preset ratio is greater than the preset ratio difference.

[0081] Specifically, when the analysis module determines that the difference between the overlap ratio between the actual contour of the printed image and the preset contour and the first preset ratio satisfies the first cause determination method, the analysis module determines the temperature adjustment method for the ambient temperature during the printing process of the printed image according to the difference between the overlap ratio and the first preset ratio, wherein:

[0082] The first temperature adjustment mode is that the analysis module determines that the difference between the overlap ratio and the first preset ratio meets the preset overlap ratio difference standard, and increases the ambient temperature during the printing image imprinting process by 2°C; the first temperature adjustment mode satisfies that the difference between the overlap ratio and the first preset ratio is less than or equal to the first preset ratio difference, and sets the first preset ratio difference to 0.1;

[0083] The second temperature adjustment mode is that the analysis module preliminarily determines that the difference between the overlap ratio and the first preset ratio does not meet the preset overlap ratio difference standard, and increases the ambient temperature during the printing image imprinting process by 4°C; the second temperature adjustment mode satisfies that the difference between the overlap ratio and the first preset ratio is greater than the first preset ratio difference and less than or equal to the second preset ratio difference, and sets the second preset ratio difference to 0.15;

[0084] The third temperature adjustment method is that the analysis module determines that the difference between the overlap ratio and the first preset ratio does not meet the preset overlap ratio difference standard, and increases the ambient temperature by 6°C during the printing image imprinting process; the third temperature adjustment method satisfies that the difference between the overlap ratio and the first preset ratio is greater than the second preset ratio difference.

[0085] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0086] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

[0087] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A packaging box printing image defect detection method, characterized in that: include: Using the detection module to detect the image information of the actual contour of the printed image and the thickness of each point; Using a test module to establish a coordinate system according to the image information and mark a number of test points on the coordinate system according to a database, and perform a packaging box hardness test on each of the test points; The analysis module determines the eligibility of the printed image embossing according to the actual contour of the printed image and determines the cause of the unqualified printed image embossing according to the offset of adjacent test points, and determines the adjustment mode of the printed image embossing device according to the cause; The regulating module is used to adjust the operating parameters of the corresponding positions of the printing image imprinting device according to the regulating mode determined by the analyzing module.

2. The packaging box printing image defect detection method according to claim 1 is characterized in that: The analysis module determines whether the printed image is qualified based on the overlap ratio between the actual contour of the printed image obtained by the detection module and the preset contour, performs a packaging box hardness test when it is determined that the overlap ratio meets the preset standard, performs a secondary determination on the printed image packaging box hardness based on the distribution of the contour of the non-overlapping part when it is preliminarily determined that the overlap ratio does not meet the preset standard, and determines the reason for the unqualified printed image printing when it is determined that the overlap ratio does not meet the preset standard.

3. The packaging box printing image defect detection method according to claim 2 is characterized in that: The analysis module determines that the printed image is qualified for embossing when it determines that the overlap ratio between the actual contour of the printed image and the preset contour meets the preset standard, and sends a notification of performing a packaging box hardness test to the test module. The test module establishes a coordinate system based on the image information obtained by the detection module and marks a number of test points on the coordinate system based on a database. After the marking is completed, a pressure test is performed on the printed image. The analysis module determines the hardness of the printed image packaging box based on the offset of the coordinates of each test point in the pressure test, wherein: The analysis module determines that the hardness of the printed image packaging box is qualified when it is determined that the offset of the test point coordinates meets the preset standard; the analysis module performs a secondary judgment on the hardness of the printed image packaging box based on the offset of adjacent test points when it is preliminarily determined that the offset of the test point coordinates does not meet the preset standard; the analysis module is used to determine the reason why the hardness of the printed image packaging box is unqualified when it is determined that the offset of the test point coordinates does not meet the preset standard.

4. The packaging box printing image defect detection method according to claim 3 is characterized in that: The analysis module performs a secondary determination on the hardness of the packaging box at the test point based on the offset of the adjacent test point when the offset of the test point is initially determined not to meet the preset standard, wherein: If the offset of the adjacent test points of the test point does not meet the preset standard, the hardness of the packaging box at the test point is determined to be qualified, and the reason why the hardness of the packaging box at the adjacent test point is unqualified is determined; if the offset of the adjacent test points of the test point meets the preset standard, the hardness of the packaging box at the test point is determined to be unqualified, and the reason why the hardness of the packaging box at the test point is unqualified is determined.

5. The packaging box printing image defect detection method according to claim 4 is characterized in that: When it is determined that the test point offset does not meet the preset standard, the analysis module determines the reason why the hardness of the printed image packaging box is unqualified based on the difference between the thickness of each test point of the printed image obtained by the detection module and the preset thickness, wherein: If the difference between the thickness of the test point and the preset thickness meets the preset difference standard, it is determined that the reason why the hardness of the printed image packaging box is unqualified is that there are bubbles in the side wall of the image during the printing process; if the difference between the thickness of the test point and the preset thickness does not meet the preset difference standard, it is determined that the coating flow rate during the printing process of the printed image does not meet the preset standard.

6. The packaging box printing image defect detection method according to claim 5 is characterized in that: When the analysis module determines that the difference between the thickness of the test point and the preset thickness meets the preset difference standard, based on the proportion of the test points whose test point offsets do not meet the standard in all the test points, several imprinting modes for the imprinting device during the printing image imprinting process are set, and the imprinting amplitudes for the imprinting device under each imprinting mode are different.

7. The packaging box printing image defect detection method according to claim 6, characterized in that: The analysis module is used to set several flow rate adjustment methods for the paint flow rate based on the difference between the thickness of the test point and the preset thickness when it is determined that the difference between the thickness of the test point and the preset thickness does not meet the preset difference standard, and the adjustment range of the paint flow rate under each flow rate adjustment method is different.

8. The packaging box printing image defect detection method according to claim 7, characterized in that: The analysis module is used to calculate the corresponding variance of the distance difference between the actual contour and the preset contour of each point of the non-overlapping part of the contour when it is preliminarily determined that the overlap ratio between the actual contour of the printed image and the preset contour does not meet the preset standard, and perform a secondary determination on whether the printed image is qualified based on the variance, wherein: The analysis module determines that the non-overlapping portion is dispersed and the printed image is qualified for embossing when the corresponding variance of the distance difference between the actual contour of each point position of the non-overlapping portion of the contour and the preset contour meets the preset variance standard; the analysis module determines that the non-overlapping portion is concentrated and the printed image is unqualified for embossing when the corresponding variance of the distance difference between the actual contour of each point position of the non-overlapping portion of the contour and the preset contour does not meet the preset variance standard, and the analysis module determines the cause of the unqualified embossing according to the difference between the overlap ratio of the actual contour of the printed image and the preset contour and the preset ratio.

9. The packaging box printing image defect detection method according to claim 8, characterized in that: The analysis module is used to determine the cause of unqualified printing of the printed image based on the difference between the overlap ratio of the actual contour of the printed image and the preset contour and the preset ratio when it is determined that the overlap ratio of the actual contour of the printed image and the preset contour does not meet the preset standard, wherein: If the difference between the overlap ratio of the actual contour of the printed image and the preset contour and the preset ratio is qualified, it is determined that the reason for the unqualified printing of the printed image is that the ambient temperature is too low during the printing process, causing the paint to solidify too quickly and the paint surface is uneven; if the overlap ratio of the actual contour of the printed image and the preset contour and the preset ratio is unqualified, it is determined that the reason for the unqualified printing of the printed image is that the paint flow rate is unstable during the printing process.

10. The packaging box printing image defect detection method according to claim 9, characterized in that: The analysis module is used to set several temperature adjustment methods for the ambient temperature during the printing process of the printed image based on the difference between the overlap ratio and the preset ratio when it is determined that the overlap ratio between the actual contour of the printed image and the preset contour is qualified, and the temperature adjustment range under each adjustment method is different.

Images