Packaging box green printing process based on water-based ink

Abstract

The invention relates to the technical field of printing processes, and discloses a packaging box green printing process based on water-based ink, which comprises the following steps: placing a packaging box to be printed on leveling equipment, and pressing and leveling under the monitoring of a flatness monitoring system. According to the method, the thickness value data of the printed matter packaging box is obtained in the pressing and covering process, the thickness extreme difference value is calculated, whether the flatness of the printed matter packaging box is abnormal or not is judged on the basis of the calculated thickness extreme difference value, if the flatness is abnormal, the calculation time point corresponding to the flatness abnormality is obtained, the calculation time point is judged, and the flatness of the printed matter packaging box is judged. According to the method and the device, the flatness abnormality condition and the flatness abnormality type in the pressing and covering process can be judged in time, so that the reason can be judged in time, a reference is provided for subsequent production, the printing quality is improved, and the rejection rate caused by the flatness abnormality problem of a printed matter packaging box is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of printing technology, and in particular to a green printing process for a packaging box based on water-based ink. Background Art

[0002] Green printing refers to the use of environmentally friendly materials and processes, which produces less pollution during the printing process, saves resources and energy, is easy to recycle and reuse after the printed products are discarded, can be naturally degraded, and has little impact on the ecological environment. Green printing requires coordination with the environment, including the use of environmentally friendly printing materials, clean printing production process, safety of printed products to users, and recycling and recyclability of printed products. That is, the entire life cycle of printed products, from raw material selection, production, use, recycling, etc., should meet environmental protection requirements;

[0003] However, when green printing is currently performed on packaging boxes, the flatness of the packaging box is one of the important factors affecting the printing quality. The uneven surface of the packaging box may lead to uneven ink distribution, resulting in printing defects such as color difference and blur, thus affecting the aesthetics and market acceptance of the product. Traditional flatness control mainly relies on manual inspection and experience adjustment. This method is not only inefficient, but also difficult to accurately identify and solve the flatness problem, especially in a high-speed, large-volume production environment.

[0004] In view of this, we have developed a green printing process for packaging boxes based on water-based inks. Summary of the invention

[0005] The object of the present invention is to provide a green printing process for packaging boxes based on water-based ink to solve the problems in the above background.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A green printing process for packaging boxes based on water-based ink comprises the following steps: placing a packaging box to be printed on a leveling device, and performing pressing and leveling under the monitoring of a flatness monitoring system; wherein the monitoring steps of the flatness monitoring system specifically comprise: S1: collecting and processing thickness value data of a printed product packaging box during the pressing process, evaluating the flatness of the printed product packaging box, and generating a flatness abnormality signal; S2: based on the generated flatness abnormality signal, obtaining a calculation time point corresponding to the flatness abnormality, and evaluating the flatness abnormality type; wherein the flatness abnormality type comprises an initial abnormality and a non-initial abnormality; S3: based on the above evaluation results of the flatness abnormality type, analyzing the causes affecting the flatness abnormality of the printed product packaging box; S4: based on the above analysis results, calculating an impact evaluation value, making a judgment, and generating an impact signal; S5: making adjustments based on the above generated impact signal.

[0008] As a further solution of the present invention: the process of generating a flatness abnormality signal includes:

[0009] In the process of laminating the printed matter packaging box, multiple detection points are set on the printed matter packaging box to be detected, and the thickness value of each detection point is collected;

[0010] During the pressing process, multiple calculation time points are set, the maximum and minimum values ​​in the thickness value data are extracted at each calculation time point, and the difference calculation is performed to obtain the thickness extreme difference value corresponding to the calculation time point;

[0011] Compare the thickness range value corresponding to each time point with the thickness range threshold;

[0012] If the thickness range value is greater than the thickness range threshold, a flatness anomaly signal is generated.

[0013] As a further solution of the present invention: the process of evaluating the flatness anomaly type includes:

[0014] Obtain the calculation time point corresponding to the generation of the flatness abnormality signal, and mark it as the abnormal calculation time point;

[0015] Obtain the calculation time point at which the overburdening starts, mark it as the initial calculation time point, and determine whether the abnormal calculation time point is the initial calculation time point;

[0016] If the abnormal calculation time point is the initial calculation time point, an initial abnormal signal is generated;

[0017] If the abnormal calculation time point is not the initial calculation time point, a non-initial abnormal signal is generated.

[0018] As a further solution of the present invention: the process of analyzing the causes affecting the abnormal flatness of the printed matter packaging box includes:

[0019] If the exception type is an initial exception, check whether there are any problems with the raw materials, design, or pre-processing process of the packaging box;

[0020] If there is a problem, adjust it; if there is no problem, recheck the detection process.

[0021] As a further solution of the present invention, the process of analyzing the causes of abnormal flatness of the printed product packaging box also includes:

[0022] Obtain the pressure representation value at each calculation time point;

[0023] comparing the pressure representation value at each calculation time point with the pressure representation threshold;

[0024] If the pressure representation value is less than or equal to the pressure representation threshold, a normal pressure signal is generated;

[0025] If the pressure characterization value is greater than the pressure characterization threshold, a pressure abnormality signal is generated.

[0026] As a further solution of the present invention: the process of obtaining the pressure characterization value is:

[0027] The abnormality type is obtained as non-initial abnormality, and the pressure standard deviation, pressure deviation ratio and pressure increase ratio are obtained;

[0028] Substitute into the formula YL=a1*YB+a2*YP+a3*YZ to calculate the pressure characterization value YL, where YB is the pressure standard deviation, YP is the pressure deviation ratio, YZ is the pressure increase ratio, and a1, a2 and a3 are preset proportional coefficients.

[0029] As a further solution of the present invention: the process of obtaining the pressure standard deviation, the pressure deviation ratio and the pressure increase ratio is as follows:

[0030] Obtain the pressure value data of each detection point during the pressing process.

[0031] At the calculation time point, the pressure value data is substituted into the standard deviation formula to calculate the pressure standard deviation at each calculation time point;

[0032] At the calculation time point, the pressure value data are summed and averaged to obtain the pressure mean value, the pressure mean value is calculated to be different from the pressure standard value to obtain the pressure deviation value, and the pressure deviation value is processed by ratio processing with the pressure standard value to obtain the pressure deviation ratio;

[0033] At the calculation time point, the maximum and minimum values ​​in the pressure value data are extracted and subtracted, and the difference is obtained and the ratio is processed with the pressure standard value to obtain the pressure increase ratio.

[0034] As a further solution of the present invention: the process of obtaining the impact assessment value is:

[0035] Obtain the calculation time point and the number of values ​​corresponding to the generation of the flatness abnormality signal, and obtain the calculation time point and the number of values ​​corresponding to the generation of the pressure abnormality signal;

[0036] Extract the coincident time point between the calculation time period for generating the flatness abnormality signal and the calculation time point for generating the pressure abnormality signal, mark them as the abnormal coincidence time point, and obtain the numerical value of the abnormal coincidence time point;

[0037] The number of values ​​in the overlapped time period is calculated by ratio calculation with the number of values ​​at the calculation time point corresponding to the flatness anomaly signal, so as to obtain the overlap ratio of the flatness anomaly;

[0038] The ratio of the number of values ​​in the overlapped time period to the number of values ​​at the calculation time point corresponding to the generated pressure anomaly signal is calculated to obtain the overlap ratio of the pressure anomaly;

[0039] The overlap ratio of flatness anomalies is multiplied by the overlap ratio of pressure anomalies to obtain the impact judgment value.

[0040] As a further solution of the present invention: the process of generating the influence signal includes:

[0041] Obtaining an impact judgment value, and comparing the impact judgment value with an impact judgment threshold;

[0042] If the impact judgment value is greater than the impact judgment threshold, an impact signal is generated.

[0043] As a further solution of the present invention: the specific process of S5 is:

[0044] Obtain the pressure representation value corresponding to the generated coincident time point, sum and average the obtained pressure representation values, and obtain the pressure representation mean value;

[0045] The pressure representation mean and the pressure representation threshold are calculated by difference, and the obtained absolute value of the difference is processed by ratio with the pressure representation threshold to obtain the control coefficient;

[0046] The real-time pressing speed in the pressing process is obtained, the obtained real-time pressing speeds are summed and averaged to obtain the pressing speed average, and the pressing speed average is multiplied by the control coefficient to obtain the adjustment value.

[0047] Beneficial effects of the present invention:

[0048] (1) The present invention obtains the thickness value data of the printed matter packaging box during the lamination process, calculates the thickness extreme difference value, and judges whether the printed matter packaging has a flatness abnormality based on the calculated thickness extreme difference. If a flatness abnormality occurs, the calculation time point corresponding to the flatness abnormality is obtained, the calculation time point is judged, and the type of flatness abnormality is evaluated, so that the flatness abnormality and the type of flatness abnormality occurring during the lamination process can be judged in time, and then the cause can be judged in time, providing a reference for subsequent production, improving printing quality, and reducing the scrap rate caused by the abnormal flatness of the printed matter packaging box;

[0049] (2) After obtaining the evaluation results, the present invention analyzes the abnormal causes that affect the abnormal flatness of the printed packaging box based on the initial abnormal type and the non-initial type, obtains pressure data based on the non-initial type, performs analysis and calculation, and determines whether the pressure is abnormal. In the case of abnormal pressure, determines whether the abnormal pressure is the cause of the abnormal flatness. If the abnormal pressure is the cause of the abnormal flatness, the pressing speed that causes the abnormal pressure is adjusted, so that when the flatness is abnormal, the cause can be determined in time, and adjustments can be made based on the causes obtained by analysis, thereby reducing the problems of printing quality caused by the abnormal flatness of the printed packaging box, reducing the occurrence of defective products and waste products, improving printing quality, and indirectly improving the utilization rate of raw materials and production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The present invention will be further described below in conjunction with the accompanying drawings.

[0051] Figure 1 It is a schematic diagram of a green printing process flow of a packaging box based on water-based ink of the present invention;

[0052] Figure 2 It is a schematic flow diagram of a flatness monitoring system in a green printing process of a packaging box based on water-based ink according to the present invention;

[0053] Figure 3 It is a schematic diagram of the process of obtaining pressure characterization values ​​in a green printing process for a packaging box based on water-based ink according to the present invention. DETAILED DESCRIPTION

[0054] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0055] Example 1

[0056] See also Figure 1 - Figure 3 As shown, the present invention is a green printing process for packaging boxes based on water-based ink, comprising the following steps:

[0057] Step 1: Water-based ink preparation

[0058] Aqueous polyurethane emulsion, pigment, reinforcing agent, dispersant, defoamer, wetting agent, thickener and deionized water are mixed in a mass ratio of 100:20:6:3.2:0.8:2.4:1:35, and stirred until homogenized to obtain aqueous ink. For details, see the green printing process for packaging boxes based on aqueous ink disclosed in announcement number CN117901561 B, which will not be described in detail here.

[0059] Step 2: Leveling and preheating

[0060] Place the packaging box to be printed on the leveling equipment, and perform pressing and leveling under the monitoring of the flatness monitoring system to keep the surface of the packaging box flat. Send the leveled packaging box into the hot air blower for preheating, which usually takes 8-12 minutes to improve the adhesion of the ink and the printing effect;

[0061] Step 3: Spray printing

[0062] The preheated packaging box is transferred to the printing press, and the ink is added to the ink tank of the printing press. The printing press presses the roller down onto the packaging box, puts down the scraper, and the packaging box is between the printing plate and the roller. The printing plate prints the ink onto the packaging box. After printing, the packaging box is dried at room temperature and packaged for storage after drying.

[0063] Step 4: Surface treatment

[0064] Carry out surface treatments such as glazing and calendering on the printed packaging boxes to enhance the gloss and aesthetics of the packaging boxes;

[0065] Optionally, the packaging box is laminated to protect the printed pattern from wear and contamination.

[0066] Example 2

[0067] Based on step 2 of the above embodiment, if the packaging box to be printed is not flat during lamination, it will affect the printing quality, for example, it will cause uneven ink distribution during printing, blur, ghosting, missing printing or uneven color. The present invention is a green printing process for packaging boxes based on water-based ink. The flatness monitoring system in the above embodiment specifically includes the following monitoring steps:

[0068] S1: During the lamination process, the thickness value data of the printed packaging box is collected and processed to evaluate the flatness of the printed packaging box;

[0069] In some embodiments, during the process of laminating the printed matter packaging box, a plurality of detection points are set on the printed matter packaging box to be detected, and the thickness value of each detection point is collected;

[0070] Exemplarily, a flatness tester may be used to collect thickness data of a printed product packaging box;

[0071] During the pressing process, multiple calculation time points are set, the maximum and minimum values ​​in the thickness value data are extracted at each calculation time point, and the difference calculation is performed to obtain the thickness extreme difference value corresponding to the calculation time point;

[0072] Compare the thickness range value corresponding to each time point with the thickness range threshold, wherein the thickness range threshold is set by a person skilled in the art based on historical multiple experimental comparisons and summaries;

[0073] If the thickness range value is less than or equal to the thickness range threshold, it means that the difference between the maximum thickness and the minimum thickness at multiple detection points of the printed product packaging box at the calculation time point is small, the flatness is high, and a normal flatness signal is generated;

[0074] If the thickness range value is greater than the thickness range threshold, it means that the maximum thickness value and the minimum thickness value of the multiple detection points of the printed product packaging box at the calculation time point are greatly different, the flatness is low, and a flatness abnormality signal is generated;

[0075] It should be explained that the difference between the maximum and minimum thickness values ​​reflects the extreme range of thickness variation on the packaging box. If the difference is small, it means that the thickness of each point on the packaging box is very close, and there is no obvious bulge or depression. Therefore, it can be considered that the packaging box is flat as a whole. On the contrary, if the difference is large, it means that there is a significant thickness difference on the packaging box, and it may be uneven.

[0076] S2: Based on the generated flatness anomaly signal, obtain the calculation time point corresponding to the flatness anomaly and evaluate the flatness anomaly type;

[0077] Among them, the types of flatness anomalies include initial anomalies and non-initial anomalies;

[0078] In some embodiments, a calculation time point corresponding to the generation of a flatness abnormality signal is obtained and marked as an abnormal calculation time point;

[0079] Obtain the calculation time point at which the overburdening starts, mark it as the initial calculation time point, and determine whether the abnormal calculation time point is the initial calculation time point;

[0080] If the abnormal calculation time point is the initial calculation time point, it means that the printed product packaging box is in an abnormal flatness state at the initial time, and an initial abnormal signal is generated;

[0081] If the abnormal calculation time point is not the initial calculation time point, it means that the printed product packaging box is in an abnormal flatness state when it is not the initial time point, and a non-initial abnormal signal is generated;

[0082] The core technology of this embodiment is: obtaining the thickness value data of the printed product packaging box during the lamination process, calculating the thickness extreme difference value, and judging whether the printed product packaging has any flatness abnormality based on the calculated thickness extreme difference. If there is any flatness abnormality, obtaining the calculation time point corresponding to the flatness abnormality, judging the calculation time point, and evaluating the type of flatness abnormality, so as to timely judge the flatness abnormality and the type of flatness abnormality occurring during the lamination process, and then timely judge the cause, provide reference for subsequent production, improve printing quality, and reduce the scrap rate caused by abnormal flatness of the printed product packaging box.

[0083] Example 3

[0084] Based on the above embodiments, the present invention is a green printing process for packaging boxes based on water-based ink. The flatness monitoring system in the above embodiments 1 and 2 specifically further includes the following monitoring steps:

[0085] S3: Based on the above evaluation results of the flatness abnormality types, analyze the reasons that affect the flatness abnormality of the printed product packaging box;

[0086] In some embodiments, based on the initial abnormal signal generated above, check whether there are problems with the raw materials, design or pre-processing process of the packaging box;

[0087] If there are problems, adjust them; if there are no problems, recheck the testing process;

[0088] In some embodiments, based on the non-initial abnormal signal generated above, the pressure value data during the pressing process is obtained, the pressure representation value is calculated, and it is determined whether an abnormality occurs;

[0089] Obtain the pressure value data of each detection point during the pressing process.

[0090] At the calculation time point, the pressure value data is substituted into the standard deviation formula to calculate the pressure standard deviation at each calculation time point;

[0091] At the calculation time point, the pressure value data are summed and averaged to obtain the pressure mean value, the pressure mean value is calculated to be different from the pressure standard value to obtain the pressure deviation value, and the pressure deviation value is processed by ratio processing with the pressure standard value to obtain the pressure deviation ratio;

[0092] At the calculation time point, the maximum and minimum values ​​in the pressure value data are extracted, and the difference is obtained, and the difference is processed with the pressure standard value to obtain the pressure increase ratio;

[0093] Exemplarily, the pressure standard value is the average of the maximum value and the minimum value of the pressure standard range threshold, wherein the pressure standard range threshold is set by a person skilled in the art based on a summary of multiple historical experimental data;

[0094] Substitute into the formula YL=a1*YB+a2*YP+a3*YZ to calculate the pressure characterization value YL, where YB is the pressure standard deviation, YP is the pressure deviation ratio, YZ is the pressure increase ratio, and a1, a2 and a3 are preset proportional coefficients;

[0095] It needs to be explained that the meaning of the pressure characterization value is: the pressure characterization value is calculated by the pressure standard deviation, the pressure deviation ratio and the pressure increase ratio. The larger the pressure standard deviation, the more unstable the pressure value data corresponding to the calculation time point is, that is, the more uneven the pressure value corresponding to the calculation time point is, the more abnormal the pressure is. The larger the pressure deviation ratio, the greater the deviation between the pressure mean value corresponding to the calculation time point and the pressure standard value is, that is, the more abnormal the pressure is. The larger the pressure increase ratio, the greater the difference between the maximum and minimum values ​​of the pressure value data at the calculation time point, the greater the fluctuation, that is, the more abnormal the pressure is.

[0096] Compare the pressure characterization value at each calculation time point with the pressure characterization threshold, wherein the pressure characterization threshold is set by a person skilled in the art based on a summary of multiple historical experimental data;

[0097] If the pressure representation value is less than or equal to the pressure representation threshold, it means that the pressure value data during the pressing process meets the pressing specification, and a normal pressure signal is generated;

[0098] If the pressure representation value is greater than the pressure representation threshold, it means that the pressure value data during the pressing process does not meet the pressing specification, and a pressure abnormality signal is generated;

[0099] S4: Based on the pressure abnormality signal generated above, calculate the impact assessment value to determine whether the pressure is the cause of the flatness abnormality;

[0100] In some embodiments, the calculation time point and the number of values ​​corresponding to the generation of the flatness abnormality signal are obtained, and the calculation time point and the number of values ​​corresponding to the generation of the pressure abnormality signal are obtained;

[0101] Extract the coincident time point between the calculation time period for generating the flatness abnormality signal and the calculation time point for generating the pressure abnormality signal, mark them as the abnormal coincidence time point, and obtain the numerical value of the abnormal coincidence time point;

[0102] The number of values ​​in the overlapped time period is calculated by ratio calculation with the number of values ​​at the calculation time point corresponding to the flatness anomaly signal, so as to obtain the overlap ratio of the flatness anomaly;

[0103] The ratio of the number of values ​​in the overlapped time period to the number of values ​​at the calculation time point corresponding to the generated pressure anomaly signal is calculated to obtain the overlap ratio of the pressure anomaly;

[0104] The overlap ratio of flatness anomalies is multiplied by the overlap ratio of pressure anomalies to obtain an impact judgment value;

[0105] Compare the impact judgment value with the impact judgment threshold, wherein the impact judgment threshold is set by a person skilled in the art based on a summary of multiple historical experimental data;

[0106] If the impact judgment value is less than or equal to the impact judgment threshold, it means that the overlap between the flatness anomaly and the pressure anomaly is low, and a non-impact signal is generated;

[0107] If the impact judgment value is greater than the impact judgment threshold, it means that the flatness anomaly and the pressure anomaly have a high degree of overlap, and an impact signal is generated;

[0108] S5: adjusting the pressure abnormality based on the influence signal generated above;

[0109] In some embodiments, the pressure representation values ​​corresponding to the generated coincident time points are obtained, and the obtained pressure representation values ​​are summed and averaged to obtain a pressure representation mean value;

[0110] The pressure representation mean and the pressure representation threshold are calculated by difference, and the obtained absolute value of the difference is processed by ratio with the pressure representation threshold to obtain the control coefficient;

[0111] Acquire the real-time pressing speed in the pressing process, sum and average the acquired real-time pressing speeds to obtain the average pressing speed, and multiply the average pressing speed by the control coefficient to obtain the adjustment value;

[0112] That is, just reduce the adjustment value at the average pressure velocity;

[0113] It should be explained that the main reason for adjusting the pressing speed is that abnormal pressure is often related to too fast pressing speed. When the pressing speed is too fast, the packaging box is subjected to a large impact force in a very short time, which may cause excessive force in some parts, while other parts are not fully subjected to pressure. This uneven force will directly affect the flatness of the packaging box, resulting in unevenness.

[0114] The core technology of this embodiment is: after obtaining the evaluation results, the abnormal reasons affecting the abnormal flatness of the printed packaging box are analyzed separately based on the initial abnormal type and the non-initial type, and the pressure data is obtained based on the non-initial type, and the analysis and calculation are performed to determine whether the pressure is abnormal. In the case of abnormal pressure, it is determined whether the abnormal pressure is the cause of the abnormal flatness. If the abnormal pressure is the cause of the abnormal flatness, the pressing speed that causes the abnormal pressure is adjusted, so that when the flatness is abnormal, the cause can be judged in time, and adjustments can be made based on the reasons obtained from the analysis, thereby reducing the problems of printing quality caused by the abnormal flatness of the printed packaging box, reducing the occurrence of defective products and waste products, improving printing quality, and indirectly improving the utilization rate of raw materials and production efficiency.

[0115] Example 4

[0116] Based on the above embodiments, the present invention is a green printing process for packaging boxes based on water-based ink, a flatness monitoring system, which specifically includes: a flatness judgment module, an abnormality type judgment module, an abnormality cause analysis module, an abnormality impact analysis module, an abnormality adjustment optimization module and a cloud management and control platform;

[0117] Flatness judgment module: collects and processes the thickness data of the printed packaging box during the lamination process, and evaluates the flatness of the printed packaging box;

[0118] Abnormality type judgment module: based on the generated flatness abnormality signal, obtain the calculation time point corresponding to the flatness abnormality and evaluate the flatness abnormality type;

[0119] Abnormality cause analysis module: Based on the above evaluation results of the flatness abnormality type, analyze the causes that affect the abnormal flatness of the printed product packaging box;

[0120] Abnormal impact analysis module: based on the pressure abnormality signal generated above, calculate the impact assessment value to determine whether the pressure is the cause of the flatness abnormality;

[0121] Abnormal adjustment optimization module: based on the impact signal generated above, adjust the pressure abnormality.

[0122] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A green printing process for packaging boxes based on water-based ink, characterized in that: The following steps are involved: Place the packaging box to be printed on the flattening equipment and perform pressing and flattening under the monitoring of the flatness monitoring system; Among them, the monitoring steps of the flatness monitoring system specifically include: S1: During the lamination process, the thickness value data of the printed product packaging box is collected and processed, the flatness of the printed product packaging box is evaluated, and a flatness abnormality signal is generated; S2: Based on the generated flatness anomaly signal, obtain the calculation time point corresponding to the flatness anomaly and evaluate the flatness anomaly type; Among them, the types of flatness anomalies include initial anomalies and non-initial anomalies; S3: Based on the above evaluation results of the flatness abnormality types, analyze the reasons that affect the flatness abnormality of the printed product packaging box; S4: Based on the above analysis results, calculate the impact assessment value, make a judgment, and generate an impact signal; S5: Perform adjustment based on the influence signal generated above.

2. A green printing process for packaging boxes based on water-based ink according to claim 1, characterized in that: The process of generating a flatness anomaly signal includes: In the process of laminating the printed matter packaging box, multiple detection points are set on the printed matter packaging box to be detected, and the thickness value of each detection point is collected; During the pressing process, multiple calculation time points are set, the maximum and minimum values ​​in the thickness value data are extracted at each calculation time point, and the difference calculation is performed to obtain the thickness extreme difference value corresponding to the calculation time point; Compare the thickness range value corresponding to each time point with the thickness range threshold; If the thickness range value is greater than the thickness range threshold, a flatness anomaly signal is generated.

3. The green printing process for packaging boxes based on water-based ink according to claim 1 is characterized in that: The process of evaluating the type of roughness anomaly includes: Obtain the calculation time point corresponding to the generation of the flatness abnormality signal, and mark it as the abnormal calculation time point; Obtain the calculation time point at which the overburdening starts, mark it as the initial calculation time point, and determine whether the abnormal calculation time point is the initial calculation time point; If the abnormal calculation time point is the initial calculation time point, an initial abnormal signal is generated; If the abnormal calculation time point is not the initial calculation time point, a non-initial abnormal signal is generated.

4. The green printing process for packaging boxes based on water-based ink according to claim 1 is characterized in that: The process of analyzing the reasons affecting the abnormal flatness of printed packaging boxes includes: If the exception type is an initial exception, check whether there are any problems with the raw materials, design, or pre-processing process of the packaging box; If there is a problem, adjust it; if there is no problem, recheck the detection process.

5. The green printing process for packaging boxes based on water-based ink according to claim 1 is characterized in that: The process of analyzing the reasons affecting the abnormal flatness of printed packaging boxes also includes: Obtain the pressure representation value at each calculation time point; comparing the pressure representation value at each calculation time point with the pressure representation threshold; If the pressure representation value is less than or equal to the pressure representation threshold, a normal pressure signal is generated; If the pressure characterization value is greater than the pressure characterization threshold, a pressure abnormality signal is generated.

6. A green printing process for packaging boxes based on water-based ink according to claim 5, characterized in that: The process of obtaining the pressure characterization value is as follows: The abnormality type is obtained as non-initial abnormality, and the pressure standard deviation, pressure deviation ratio and pressure increase ratio are obtained; Substitute into the formula YL=a1*YB+a2*YP+a3*YZ to calculate the pressure characterization value YL, where YB is the pressure standard deviation, YP is the pressure deviation ratio, YZ is the pressure increase ratio, and a1, a2 and a3 are preset proportional coefficients.

7. A green printing process for packaging boxes based on water-based ink according to claim 6, characterized in that: The process of obtaining the pressure standard deviation, pressure deviation ratio and pressure increase ratio is as follows: Obtain the pressure value data of each detection point during the pressing process; At the calculation time point, the pressure value data is substituted into the standard deviation formula to calculate the pressure standard deviation at each calculation time point; At the calculation time point, the pressure value data are summed and averaged to obtain the pressure mean value, the pressure mean value is calculated to be different from the pressure standard value to obtain the pressure deviation value, and the pressure deviation value is processed by ratio processing with the pressure standard value to obtain the pressure deviation ratio; At the calculation time point, the maximum and minimum values ​​in the pressure value data are extracted and subtracted, and the difference is obtained and the ratio is processed with the pressure standard value to obtain the pressure increase ratio.

8. The green printing process for packaging boxes based on water-based ink according to claim 1, characterized in that: The process of obtaining the impact assessment value is as follows: Obtain the calculation time point and the number of values ​​corresponding to the generation of the flatness abnormality signal, and obtain the calculation time point and the number of values ​​corresponding to the generation of the pressure abnormality signal; Extract the coincident time point between the calculation time period for generating the flatness abnormality signal and the calculation time point for generating the pressure abnormality signal, mark them as the abnormal coincidence time point, and obtain the numerical value of the abnormal coincidence time point; The number of values ​​in the overlapped time period is calculated by ratio calculation with the number of values ​​at the calculation time point corresponding to the flatness anomaly signal, so as to obtain the overlap ratio of the flatness anomaly; The ratio of the number of values ​​in the overlapped time period to the number of values ​​at the calculation time point corresponding to the generated pressure anomaly signal is calculated to obtain the overlap ratio of the pressure anomaly; The overlap ratio of flatness anomalies is multiplied by the overlap ratio of pressure anomalies to obtain the impact judgment value.

9. The green printing process for packaging boxes based on water-based ink according to claim 7, characterized in that: The process of generating an influence signal includes: Obtaining an impact judgment value, and comparing the impact judgment value with an impact judgment threshold; If the impact judgment value is greater than the impact judgment threshold, an impact signal is generated.

10. The green printing process for packaging boxes based on water-based ink according to claim 1, characterized in that: The specific process of S5 is as follows: Obtain the pressure representation value corresponding to the generated coincident time point, sum and average the obtained pressure representation values, and obtain the pressure representation mean value; The pressure representation mean and the pressure representation threshold are calculated by difference, and the obtained absolute value of the difference is processed by ratio with the pressure representation threshold to obtain the control coefficient; The real-time pressing speed in the pressing process is obtained, the obtained real-time pressing speeds are summed and averaged to obtain the pressing speed average, and the pressing speed average is multiplied by the control coefficient to obtain the adjustment value.

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