Automatic detection system for printing quality of cigarette packaging paper

Abstract

The invention particularly relates to an automatic detection system for printing quality of cigarette packaging paper. The automatic detection system comprises the following parts: sample data acquisition; analyzing printing data; judging and processing; equipment condition diagnosis; and comprehensive treatment. According to the method, analysis operation on the printing equipment is automatically triggered according to the qualified rate condition, related parameter information such as printing pressure, speed and ink flow of the equipment is obtained, fault indexes are obtained through a series of calculation, and possible fault points of the equipment are accurately positioned; therefore, equipment problems can be found quickly, maintenance can be carried out in time, equipment downtime can be reduced, equipment utilization rate can be improved, whether printing ink quality is qualified can be judged accurately according to the printing ink quality index, and printing quality defects caused by the printing ink problems can be avoided.

Description

Technical Field

[0001] The invention relates to the technical field of printing quality detection, in particular to an automatic detection system for printing quality of cigarette packaging paper. Background Art

[0002] In the field of cigarette production, the printing quality of cigarette packaging paper is one of the key factors affecting the overall quality and market competitiveness of the product.

[0003] Current technical means can often only identify substandard products, but cannot diagnose the root cause of the problem in depth and in a timely manner. In this case, the only option is to shut down the machine and wait for maintenance personnel to inspect and repair the printing equipment. This process not only consumes a lot of time, causing production stagnation and increasing production costs, but also due to the lack of rapid location and prediction of faults, maintenance personnel also need to spend more time and energy to troubleshoot problems during maintenance, further extending the downtime of the equipment.

[0004] Therefore, a cigarette packaging paper printing quality automatic detection system is needed to solve the above-mentioned problems. Summary of the invention

[0005] The purpose of the present invention is to solve the above-mentioned problem and to provide an automatic detection system for printing quality of cigarette packaging paper.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] The automatic inspection system for printing quality of cigarette packaging paper includes the following parts:

[0008] Sample data collection: Mark the cigarette packaging papers printed within a set time as the test group, divide the cigarette packaging papers in the test group into several groups according to the preset division ratio, randomly select a set amount of packaging papers from each divided group as test samples, so as to construct a test sample group; obtain the image information of each packaging paper in the test sample group;

[0009] Printing data analysis: Analyze the image information of the packaging paper in the test sample group to obtain the judgment index U jud ; Extract the judgment index U of each packaging paper in the test sample group jud , and compare it with the established judgment threshold, and use the judgment index U jud The packaging paper with a value less than the judgment threshold is marked as a failed sample, and the judgment index U jud The packaging paper with a value greater than the judgment threshold is marked as a qualified sample; the qualified rate is obtained by dividing the number of qualified samples by the number of packaging papers in the test sample group;

[0010] Judgment and processing: Conduct corresponding analysis and processing based on the qualified rate of the test sample group;

[0011] Equipment condition diagnosis: Obtain relevant parameter information of the printing equipment corresponding to the packaging paper to be tested whose qualified rate is less than the qualified rate threshold, and perform corresponding analysis to obtain the fault index S eva ; The parameter information includes: printing pressure, printing speed, printing ink flow, tension on the test paper, and drying time of the test paper after printing;

[0012] Comprehensive processing: based on the obtained fault index S eva And the preset ink quality index is used to analyze and process the printing equipment accordingly.

[0013] Preferably, in the judgment process, the specific process includes the following parts:

[0014] A pass rate threshold is set, and the pass rate of the test sample group is compared with the pass rate threshold. If the pass rate of the test sample group is greater than the pass rate threshold, it is determined that the printing quality of the packaging paper in the group to be tested corresponding to the test sample group is qualified; if the pass rate of the test sample group is less than the pass rate threshold, the judgment index of all the packaging papers in the group to be tested corresponding to the test sample group is obtained;

[0015] Obtain the pass rate of the group to be tested, and compare the pass rate of the group to be tested with the pass rate threshold. If the pass rate of the group to be tested is greater than the pass rate threshold, the printing quality of the packaging paper in the group to be tested is determined to be qualified. If the pass rate of the group to be tested is less than the pass rate threshold, the printing quality of the packaging paper in the group to be tested is determined to be unqualified, and the analysis operation of the packaging paper printing equipment is triggered.

[0016] Preferably, the image information of each packaging paper in the detection sample group is analyzed to obtain the judgment index U jud , the specific process includes:

[0017] Obtain image information of cigarette packaging paper, and pre-process the image information to obtain a packaging paper pixel map; obtain all pixel points of text and patterns on the packaging paper, calculate the contrast between each pixel point and adjacent pixel points, and count the contrast of all pixel points of text and patterns on the packaging paper; divide the contrast of all pixel points by the total number of all pixel points to obtain an average contrast;

[0018] Obtain the RGB values ​​of all pixels of text and patterns on the cigarette packaging paper pixel map, preset the RGB standard value of each pixel, and calculate the difference between the RGB value of each pixel and its corresponding RGB standard value in turn to obtain the color difference value of each pixel; extract the maximum color difference value and the minimum color difference value, and subtract the minimum color difference value from the maximum color difference value to obtain the color difference extreme value;

[0019] Divide the cigarette packaging paper into a number of areas, obtain the glossiness of each measurement area, sum it up and divide it by the number of measurement areas to obtain the average glossiness;

[0020] The glossiness of each area is calculated in turn with the average glossiness to obtain the corresponding glossiness deviation values, and the allowable range of the glossiness deviation value is set. The area corresponding to the glossiness deviation value within the allowable range of the glossiness deviation value is marked as a normal area. All normal areas are counted and divided by the total number of areas divided by the packaging paper to obtain the normal ratio;

[0021] The average contrast, color difference extreme value, and normal proportion are marked as U co , U cl , U gz , and substitute into the formula:

[0022]

[0023] Get the judgment index U jud ; where K co , K cl , K gz They are the preset reference average contrast, reference color difference extreme value, reference normal ratio, and a 1 、a 2 、a 3 They are the weight factors corresponding to the average contrast, color difference extreme value, and normal proportion respectively.

[0024] Preferably, the relevant parameter information of the printing equipment corresponding to the tested group of packaging papers whose pass rate is less than the pass rate threshold is analyzed accordingly, and the specific analysis includes the following parts:

[0025] Place the pressure test paper between the printing roller and the cigarette paper, start the printing equipment to perform the printing test operation; obtain various parameter information of the printing equipment during operation within the set time;

[0026] Set the standard parameter value of any parameter in the status information when the printing device is in the startup state, calculate the difference between the parameter value in the startup state and the standard parameter value corresponding to the parameter, and obtain the standard deviation value corresponding to the parameter; set the allowed floating range of the standard deviation value of the parameter, if the standard deviation value is not within the corresponding allowed floating range, mark the standard deviation value as deviating from the standard deviation value;

[0027] Calculate the difference between the maximum and minimum standard deviation values ​​within the set time and take the absolute value to obtain the deviation range value;

[0028] Take the absolute value of all standard deviation values ​​within the set time and then calculate the mean to get the standard deviation mean;

[0029] Perform standard deviation calculation on the standard deviation value within the set time to obtain the standard deviation wave value;

[0030] Record any generation time that deviates from the standard deviation value within the set time, calculate the time difference between its adjacent generation time and obtain the adjacent time difference value; calculate the standard deviation of the adjacent time difference value within the set time to obtain the biased time fluctuation value;

[0031] Preset the weight factors corresponding to the standard deviation value, the extreme deviation value, the mean standard deviation value, the standard deviation wave value, and the deviation time fluctuation value, respectively, and multiply the standard deviation value, the extreme deviation value, the mean standard deviation value, the standard deviation wave value, and the deviation time fluctuation value with their corresponding weight factors and then sum them to obtain the abnormal index corresponding to the parameter;

[0032] Substitute the anomaly index corresponding to all parameters into the formula;

[0033]

[0034] Get the fault index S eva ; Where i represents the number of the parameter in the status information, n is the total number of parameters, iE, inη represent the abnormal index corresponding to the parameter i in the status information and its corresponding weight.

[0035] Preferably, the method for obtaining the ink quality index specifically includes the following parts:

[0036] The printing equipment corresponding to the packaging paper of the group to be tested whose qualified rate is less than the qualified rate threshold is shut down, and the ink in the ink tank of the printing unit of the printing equipment is taken out by a dropper and placed in a collection container;

[0037] After the ink sample in the collection container is stirred evenly, it is evenly divided into several test samples according to the set amount, and each test sample is placed in a corresponding transparent container as a test group;

[0038] Randomly select an ink test sample from the test group and add it to the ink tank of the printing equipment used for packaging paper printing with qualified quality, and the ink tank of the printing equipment only contains the ink test sample from the test group; after starting the printing equipment to print the ink in the test group on the test paper, the test paper is divided into a plurality of samples according to the position of the ink printing;

[0039] Stick the tape on the ink surface of the sample, and the tape and the ink layer of the sample are in close contact without bubbles; fix the side of the sample without tape to the fixed fixture of the testing machine, and fix the side of the sample with tape to the movable fixture of the testing machine;

[0040] Perform peeling tests on each sample in turn and record the peeling force of each sample. Sum the peeling forces of each sample and divide by the total number of samples to obtain the average peeling force. Set up an allowable floating range for the average peeling force, and mark the peeling force that does not fall within the allowable floating range for the average peeling force as an abnormal peeling force. Record the number of all abnormal peeling forces and divide by the total number of samples to obtain the abnormal peeling ratio.

[0041] Randomly select another ink test sample from the test group:

[0042] After obtaining the ink weight of the ink test sample, pour the ink test sample into a transparent collection container with a filter screen, mark the ink particles that do not pass through the filter screen as abnormal particles, and weigh the abnormal particles to obtain the abnormal particle weight; divide the abnormal particle weight by the ink weight of the test sample to obtain the abnormal weight ratio;

[0043] The weight factors corresponding to the abnormal peeling ratio and the abnormal weight ratio are preset, and the abnormal peeling ratio and the abnormal weight ratio are multiplied by the corresponding weight factors and then summed to obtain the ink quality index.

[0044] Preferably, the fault index S obtained based on eva And the preset ink quality index to analyze and process the printing equipment accordingly, including:

[0045] Establishing a fault index threshold and an ink quality index threshold, comparing the fault index and the ink quality index with their corresponding thresholds respectively, if the fault index is greater than its threshold, it is determined that the printing device is faulty, and if the ink quality index is greater than its threshold, it is determined that the quality of the ink is unqualified;

[0046] If the fault index S eva If the and ink quality indexes are both less than the corresponding thresholds, the operator of the printing equipment is replaced and the parameters of the printing equipment are reset according to the equipment operation manual. Then, a printing test is performed on a set amount of packaging paper to obtain the judgment index U of each packaging paper after printing. jud , and calculate the overall pass rate of the printed test packaging paper. If the pass rate is greater than the established threshold, the printing equipment is judged to be normal.

[0047] Preferably, when a printing device is determined to be faulty, the number and position of the printing device are marked as fault information, and the image information of unqualified packaging paper printed by the printing device and the fault information of the printing device are sent together to the intelligent terminal of the equipment maintenance personnel.

[0048] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0049] 1. The present invention automatically triggers the analysis operation of the printing equipment according to the qualified rate, obtains the relevant parameter information of the equipment, such as printing pressure, speed, ink flow, etc., and obtains the fault index through a series of calculations to accurately locate the possible fault points of the equipment; this not only helps to quickly discover equipment problems, carry out maintenance in time, reduce equipment downtime, and improve equipment utilization, but also can accurately judge whether the ink quality is qualified according to the ink quality index, and avoid printing quality defects caused by ink problems.

[0050] 2. The present invention quantifies and calculates multiple key indicators such as the average contrast, color difference extreme value, and normal ratio of the packaging paper to obtain an accurate judgment index and pass rate, which greatly improves the accuracy of detection. When the pass rate is lower than the threshold value, the device is detected to determine whether the device is faulty. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Further details, features and advantages of the present application are disclosed in the following description of exemplary embodiments in conjunction with the accompanying drawings, in which:

[0052] Figure 1 It is the system principle diagram of the present invention; DETAILED DESCRIPTION

[0053] Several embodiments of the present application will be described in more detail below with reference to the accompanying drawings so that those skilled in the art can implement the present application. The present application can be embodied in many different forms and purposes and should not be limited to the embodiments described herein. These embodiments are provided to make the present application comprehensive and complete, and to fully convey the scope of the present application to those skilled in the art. The embodiments do not limit the present application.

[0054] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which this application belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and / or this specification, and will not be interpreted in an idealized or overly formal sense, unless explicitly defined as such herein.

[0055] See also Figure 1 As shown, the present invention provides a technical solution:

[0056] The automatic inspection system for printing quality of cigarette packaging paper includes the following parts:

[0057] Sample data collection: Mark the cigarette packaging papers printed within a set time as the test group, divide the cigarette packaging papers in the test group into several groups according to the preset division ratio, randomly select a set amount of packaging papers from each divided group as test samples, so as to construct a test sample group; obtain the image information of each packaging paper in the test sample group;

[0058] Printing data analysis: Analyze the image information of the packaging paper in the test sample group to obtain the judgment index U jud ; Extract the judgment index U of each packaging paper in the test sample group jud , and compare it with the established judgment threshold, and use the judgment index U jud The packaging paper with a value less than the judgment threshold is marked as a failed sample, and the judgment index U jud The packaging paper with a value greater than the judgment threshold is marked as a qualified sample; the qualified rate is obtained by dividing the number of qualified samples by the number of packaging papers in the test sample group;

[0059] The image information of each packaging paper in the test sample group is analyzed to obtain the judgment index U jud , the specific process includes:

[0060] Obtain image information of cigarette packaging paper, and pre-process the image information to obtain a packaging paper pixel map; obtain all pixel points of text and patterns on the packaging paper, calculate the contrast between each pixel point and adjacent pixel points, and count the contrast of all pixel points of text and patterns on the packaging paper; divide the contrast of all pixel points by the total number of all pixel points to obtain an average contrast;

[0061] The preprocessing specifically includes: firstly, basic processing is performed, the image conversion format is read, it is converted into a matrix form, the color image is grayed to reduce complexity, and irrelevant background on the wrapping paper is removed by rotation and cropping; secondly, image enhancement is performed, contrast enhancement is used to highlight the characteristics of the wrapping paper, and filtering algorithms are used to remove noise; then image segmentation is performed, and the wrapping paper is segmented by threshold segmentation and edge detection; then morphological processing is performed, using corrosion, expansion, opening and closing operations to refine or thicken the pattern, remove noise, etc.; finally, the image is corrected and normalized through geometric transformations, such as affine transformation, to obtain a wrapping paper pixel map;

[0062] Obtain the RGB values ​​of all pixels of text and patterns on the cigarette packaging paper pixel map, preset the RGB standard value of each pixel, and calculate the difference between the RGB value of each pixel and its corresponding RGB standard value in turn to obtain the color difference value of each pixel; extract the maximum color difference value and the minimum color difference value, and subtract the minimum color difference value from the maximum color difference value to obtain the color difference extreme value;

[0063] Divide the cigarette packaging paper into a number of areas, obtain the glossiness of each measurement area, sum it up and divide it by the number of measurement areas to obtain the average glossiness;

[0064] The glossiness of each area is calculated in turn with the average glossiness to obtain the corresponding glossiness deviation values, and the allowable range of the glossiness deviation value is set. The area corresponding to the glossiness deviation value within the allowable range of the glossiness deviation value is marked as a normal area. All normal areas are counted and divided by the total number of areas divided by the packaging paper to obtain the normal ratio;

[0065] The average contrast, color difference extreme value, and normal proportion are marked as U co , U cl , U gz , and substitute into the formula:

[0066]

[0067] Get the judgment index U jud ; where K co , K cl , K gz They are the preset reference average contrast, reference color difference extreme value, reference normal ratio, and a 1 、a 2 、a 3 They are the weight factors corresponding to the average contrast, color difference extreme value, and normal proportion respectively;

[0068] Judgment and processing: Conduct corresponding analysis and processing based on the qualified rate of the test sample group;

[0069] The specific process of judgment processing includes the following parts:

[0070] A pass rate threshold is set, and the pass rate of the test sample group is compared with the pass rate threshold. If the pass rate of the test sample group is greater than the pass rate threshold, it is determined that the printing quality of the packaging paper in the group to be tested corresponding to the test sample group is qualified; if the pass rate of the test sample group is less than the pass rate threshold, the judgment index of all the packaging papers in the group to be tested corresponding to the test sample group is obtained;

[0071] According to the above process of analyzing the packaging paper in the test sample group to obtain the qualified rate, the packaging paper of the group to be tested is analyzed to obtain the qualified rate of the group to be tested, and the qualified rate of the group to be tested is compared with the qualified rate threshold. If the qualified rate of the group to be tested is greater than the qualified rate threshold, it is determined that the printing quality of the packaging paper in the group to be tested is qualified. If the qualified rate of the group to be tested is less than the qualified rate threshold, it is determined that the printing quality of the packaging paper in the group to be tested is unqualified, and the analysis operation of the packaging paper printing equipment is triggered.

[0072] Equipment condition diagnosis: Obtain relevant parameter information of the printing equipment corresponding to the packaging paper to be tested whose qualified rate is less than the qualified rate threshold, and perform corresponding analysis to obtain the fault index S eva ; The parameter information includes: printing pressure, printing speed, printing ink flow, tension on the test paper, and drying time of the test paper after printing;

[0073] Corresponding analysis is performed on the relevant parameter information of the printing equipment corresponding to the packaging paper to be tested whose qualified rate is less than the qualified rate threshold. The specific analysis includes the following parts:

[0074] Place the pressure test paper between the printing roller and the cigarette paper, start the printing equipment to perform the printing test operation; obtain various parameter information of the printing equipment during operation within the set time;

[0075] Set the standard parameter value of any parameter in the status information when the printing device is in the startup state, calculate the difference between the parameter value in the startup state and the standard parameter value corresponding to the parameter, and obtain the standard deviation value corresponding to the parameter; set the allowed floating range of the standard deviation value of the parameter, if the standard deviation value is not within the corresponding allowed floating range, mark the standard deviation value as deviating from the standard deviation value;

[0076] Calculate the difference between the maximum and minimum standard deviation values ​​within the set time and take the absolute value to obtain the deviation range value;

[0077] Take the absolute value of all standard deviation values ​​within the set time and then calculate the mean to get the standard deviation mean;

[0078] Perform standard deviation calculation on the standard deviation value within the set time to obtain the standard deviation wave value;

[0079] Record any generation time that deviates from the standard deviation value within the set time, calculate the time difference between its adjacent generation time and obtain the adjacent time difference value; calculate the standard deviation of the adjacent time difference value within the set time to obtain the biased time fluctuation value;

[0080] Preset the weight factors corresponding to the standard deviation value, the extreme deviation value, the mean standard deviation value, the standard deviation wave value, and the deviation time fluctuation value, respectively, and multiply the standard deviation value, the extreme deviation value, the mean standard deviation value, the standard deviation wave value, and the deviation time fluctuation value with their corresponding weight factors and then sum them to obtain the abnormal index corresponding to the parameter;

[0081] Substitute the anomaly index corresponding to all parameters into the formula;

[0082]

[0083] Get the fault index S eva; Where i represents the number of the parameter in the status information, n is the total number of parameters, iE, ini represents the abnormal index corresponding to the parameter i in the status information and its corresponding weight;

[0084] Comprehensive processing: based on the obtained fault index S eva And the preset ink quality index to analyze and process the printing equipment accordingly;

[0085] The method of obtaining the ink quality index specifically includes the following parts:

[0086] The printing equipment corresponding to the packaging paper of the group to be tested whose qualified rate is less than the qualified rate threshold is shut down, and the ink in the ink tank of the printing unit of the printing equipment is taken out by a dropper and placed in a collection container;

[0087] After the ink sample in the collection container is stirred evenly, it is evenly divided into several test samples according to the set amount, and each test sample is placed in a corresponding transparent container as a test group;

[0088] Randomly select an ink test sample from the test group and add it to the ink tank of the printing equipment used for packaging paper printing with qualified quality, and the ink tank of the printing equipment only contains the ink test sample from the test group; after starting the printing equipment to print the ink in the test group on the test paper, the test paper is divided into a plurality of samples according to the position of the ink printing;

[0089] Stick the tape on the ink surface of the sample, and the tape and the ink layer of the sample are in close contact without bubbles; fix the side of the sample without tape to the fixed fixture of the testing machine, and fix the side of the sample with tape to the movable fixture of the testing machine;

[0090] Perform peeling tests on each sample in turn and record the peeling force of each sample. Sum the peeling forces of each sample and divide by the total number of samples to obtain the average peeling force. Set up an allowable floating range for the average peeling force, and mark the peeling force that does not fall within the allowable floating range for the average peeling force as an abnormal peeling force. Record the number of all abnormal peeling forces and divide by the total number of samples to obtain the abnormal peeling ratio.

[0091] Randomly select another ink test sample from the test group:

[0092] After obtaining the ink weight of the ink test sample, pour the ink test sample into a transparent collection container with a filter screen, mark the ink particles that do not pass through the filter screen as abnormal particles, and weigh the abnormal particles to obtain the abnormal particle weight; divide the abnormal particle weight by the ink weight of the test sample to obtain the abnormal weight ratio;

[0093] Preset the weight factors corresponding to the abnormal peeling ratio and the abnormal weight ratio, respectively, and calculate the product of the abnormal peeling ratio and the abnormal weight ratio and their corresponding weight factors, and then sum them to obtain the ink quality index;

[0094] Based on the obtained fault index S eva And the preset ink quality index to analyze and process the printing equipment accordingly, including:

[0095] Establishing a fault index threshold and an ink quality index threshold, comparing the fault index and the ink quality index with their corresponding thresholds respectively, if the fault index is greater than its threshold, it is determined that the printing device is faulty, and if the ink quality index is greater than its threshold, it is determined that the quality of the ink is unqualified;

[0096] If the fault index S eva If the and ink quality indexes are both less than the corresponding thresholds, the operator of the printing equipment is replaced and the parameters of the printing equipment are reset according to the equipment operation manual. Then, a printing test is performed on a set amount of packaging paper to obtain the judgment index U of each packaging paper after printing. jud , and calculate the overall qualified rate of the printed test packaging paper. If the qualified rate is greater than the established threshold, it is determined that the printing equipment is normal;

[0097] When a printing device is determined to be faulty, the number and location of the printing device are marked as fault information, and the image information of unqualified packaging paper printed by the printing device and the fault information of the printing device are sent to the intelligent terminal of the equipment maintenance personnel.

[0098] The above formulas are obtained by collecting a large amount of data and performing software simulation, and a formula close to the actual value is selected. The influencing weight factor and specific coefficient value in the formula are set by technical personnel in this field according to actual conditions, and can be adjusted and modified later.

[0099] The above description of the embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. Automatic detection system for printing quality of cigarette packaging paper, characterized in that: Includes the following sections: Sample data collection: Mark the cigarette packaging papers printed within a set time as the test group, divide the cigarette packaging papers in the test group into several groups according to the preset division ratio, and randomly select a set amount of packaging papers from each divided group as test samples, so as to construct a test sample group; Obtain image information of each packaging paper in the detection sample group; Printing data analysis: Analyze the image information of the packaging paper in the test sample group to obtain the judgment index U jud ; Extract the judgment index U of each packaging paper in the test sample group jud , and compare it with the established judgment threshold, and use the judgment index U jud The packaging paper with a value less than the judgment threshold is marked as a failed sample, and the judgment index U jud The packaging paper with a value greater than the judgment threshold is marked as a qualified sample; the qualified rate is obtained by dividing the number of qualified samples by the number of packaging papers in the test sample group; Judgment and processing: Conduct corresponding analysis and processing based on the qualified rate of the test sample group; Equipment condition diagnosis: Obtain relevant parameter information of the printing equipment corresponding to the packaging paper to be tested whose qualified rate is less than the qualified rate threshold, and perform corresponding analysis to obtain the fault index S eva ; in Parameter information includes: printing pressure, printing speed, printing ink flow, tension on the test paper, and drying time of the test paper after printing; Comprehensive processing: based on the obtained fault index S eva And the preset ink quality index is used to analyze and process the printing equipment accordingly.

2. The automatic detection system for printing quality of cigarette packaging paper according to claim 1 is characterized in that: In the judgment process, the specific process includes the following parts: A pass rate threshold is set, and the pass rate of the test sample group is compared with the pass rate threshold. If the pass rate of the test sample group is greater than the pass rate threshold, it is determined that the printing quality of the packaging paper in the group to be tested corresponding to the test sample group is qualified; if the pass rate of the test sample group is less than the pass rate threshold, the judgment index of all the packaging papers in the group to be tested corresponding to the test sample group is obtained; Obtain the pass rate of the group to be tested; and compare the pass rate of the group to be tested with the pass rate threshold. If the pass rate of the group to be tested is greater than the pass rate threshold, it is determined that the printing quality of the packaging paper in the group to be tested is qualified. If the pass rate of the group to be tested is less than the pass rate threshold, it is determined that the printing quality of the packaging paper in the group to be tested is unqualified, and the analysis operation of the packaging paper printing equipment is triggered.

3. The automatic detection system for printing quality of cigarette packaging paper according to claim 1 is characterized in that: The image information of each packaging paper in the detection sample group is analyzed to obtain the judgment index U jud , the specific process includes: Obtain image information of cigarette packaging paper, and pre-process the image information to obtain a packaging paper pixel map; obtain all pixel points of text and patterns on the packaging paper, calculate the contrast between each pixel point and adjacent pixel points, and count the contrast of all pixel points of text and patterns on the packaging paper; divide the contrast of all pixel points by the total number of all pixel points to obtain an average contrast; Obtain the RGB values ​​of all pixels of text and patterns on the cigarette packaging paper pixel map, preset the RGB standard value of each pixel, and calculate the difference between the RGB value of each pixel and its corresponding RGB standard value in turn to obtain the color difference value of each pixel; extract the maximum color difference value and the minimum color difference value, and subtract the minimum color difference value from the maximum color difference value to obtain the color difference extreme value; Divide the cigarette packaging paper into a number of areas, obtain the glossiness of each measurement area, sum it up and divide it by the number of measurement areas to obtain the average glossiness; The glossiness of each area is calculated in turn with the average glossiness to obtain the corresponding glossiness deviation values, and the allowable range of the glossiness deviation value is set. The area corresponding to the glossiness deviation value within the allowable range of the glossiness deviation value is marked as a normal area. All normal areas are counted and divided by the total number of areas divided by the packaging paper to obtain the normal ratio; The average contrast, color difference extreme value, and normal proportion are marked as U co , U cl , U gz , and substitute into the formula: Get the judgment index U jud ; where K co , K cl , K gz are the preset reference average contrast, reference color difference extreme value, and reference normal proportion respectively. a1, a2, and a3 are the weight factors corresponding to the average contrast, color difference extreme value, and normal proportion respectively.

4. The automatic detection system for printing quality of cigarette packaging paper according to claim 1 is characterized in that: The relevant parameter information of the printing equipment corresponding to the packaging paper to be tested whose qualified rate is less than the qualified rate threshold is analyzed accordingly, and the specific analysis includes the following parts: Place the pressure test paper between the printing roller and the cigarette paper, and start the printing equipment to perform a printing test operation; Obtain various parameter information of the printing equipment during operation within the set time; Setting a standard parameter value of any parameter in the status information of the printing device in the startup state, performing difference calculation between the parameter value in the startup state and the standard parameter value corresponding to the parameter, and obtaining the standard deviation value corresponding to the parameter; Set the allowed floating range of the standard deviation value of the parameter. If the standard deviation value is not within its corresponding allowed floating range, the standard deviation value will be marked as deviating from the standard deviation value. Calculate the difference between the maximum and minimum standard deviation values ​​within the set time and take the absolute value to obtain the deviation range value; Take the absolute value of all standard deviation values ​​within the set time and then calculate the mean to get the standard deviation mean; Perform standard deviation calculation on the standard deviation value within the set time to obtain the standard deviation wave value; Record any generation time that deviates from the standard deviation value within the set time, calculate the time difference between its adjacent generation time and obtain the adjacent time difference value; calculate the standard deviation of the adjacent time difference value within the set time to obtain the biased time fluctuation value; Preset the weight factors corresponding to the standard deviation value, the extreme deviation value, the mean standard deviation value, the standard deviation wave value, and the deviation time fluctuation value, respectively, and multiply the standard deviation value, the extreme deviation value, the mean standard deviation value, the standard deviation wave value, and the deviation time fluctuation value with their corresponding weight factors and then sum them to obtain the abnormal index corresponding to the parameter; Substitute the anomaly index corresponding to all parameters into the formula; Get the fault index S eva ; Where i represents the number of the parameter in the status information, n is the total number of parameters, iE, inη represent the abnormal index corresponding to the parameter i in the status information and its corresponding weight.

5. The automatic detection system for printing quality of cigarette packaging paper according to claim 1 is characterized in that: The method for obtaining the ink quality index specifically includes the following parts: The printing equipment corresponding to the packaging paper of the group to be tested whose qualified rate is less than the qualified rate threshold is shut down, and the ink in the ink tank of the printing unit of the printing equipment is taken out by a dropper and placed in a collection container; After the ink sample in the collection container is stirred evenly, it is evenly divided into several test samples according to the set amount, and each test sample is placed in a corresponding transparent container as a test group; Randomly select one ink test sample from the test group and add it to the ink tank of the printing equipment used for printing packaging paper with qualified quality, and the ink tank of the printing equipment only contains the ink test sample from the test group; After starting the printing device to print the ink in the test group on the test paper, the test paper is divided into a plurality of samples according to the position of the ink printing; Stick the tape on the ink surface of the sample, and the tape and the ink layer of the sample are in close contact without bubbles; fix the side of the sample without tape to the fixed fixture of the testing machine, and fix the side of the sample with tape to the movable fixture of the testing machine; Perform peeling tests on each sample in turn and record the peeling force of each sample. Sum the peeling forces of each sample and divide by the total number of samples to obtain the average peeling force. Set up an allowable floating range for the average peeling force, and mark the peeling force that does not fall within the allowable floating range for the average peeling force as an abnormal peeling force. Record the number of all abnormal peeling forces and divide by the total number of samples to obtain the abnormal peeling ratio. Randomly select another ink test sample from the test group: After obtaining the ink weight of the ink test sample, pour the ink test sample into a transparent collection container with a filter screen, mark the ink particles that do not pass through the filter screen as abnormal particles, and weigh the abnormal particles to obtain the abnormal particle weight; divide the abnormal particle weight by the ink weight of the test sample to obtain the abnormal weight ratio; The weight factors corresponding to the abnormal peeling ratio and the abnormal weight ratio are preset, and the abnormal peeling ratio and the abnormal weight ratio are multiplied by the corresponding weight factors and then summed to obtain the ink quality index.

6. The automatic inspection system for printing quality of cigarette packaging paper according to claim 1, characterized in that: The fault index S obtained based on eva And the preset ink quality index to analyze and process the printing equipment accordingly, including: Establishing a fault index threshold and an ink quality index threshold, comparing the fault index and the ink quality index with their corresponding thresholds respectively, if the fault index is greater than its threshold, it is determined that the printing device is faulty, and if the ink quality index is greater than its threshold, it is determined that the quality of the ink is unqualified; If the fault index S eva If the and ink quality indexes are both less than the corresponding thresholds, the operator of the printing equipment is replaced and the parameters of the printing equipment are reset according to the equipment operation manual. Then, a printing test is performed on a set amount of packaging paper to obtain the judgment index U of each packaging paper after printing. jud , and calculate the overall pass rate of the printed test packaging paper. If the pass rate is greater than the established threshold, the printing equipment is judged to be normal.

7. The automatic inspection system for printing quality of cigarette packaging paper according to claim 6, characterized in that: When it is determined that the printing device is faulty, the number and position of the printing device are marked as fault information, and the image information of the unqualified packaging paper printed by the printing device and the fault information of the printing device are sent to the intelligent terminal of the equipment maintenance personnel.

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