Thermal transfer machine production line processing operation control method and system

Abstract

The present invention discloses a processing and operation control method for a thermal transfer machine production line, including configuring the operating parameters of each device in the thermal transfer machine production line, including the feeding speed, printing temperature and printing speed; preheating the thermal printer and matching and debugging the feeding speed and printing speed, and feeding after completion. The image of the object to be printed at the printing position is collected in real time, the position of the object to be printed is automatically corrected, and the printable range and the first printing area of ​​the object to be printed are determined; the defects in the area are identified and the correlation between the defects and the printing quality is calculated; if it is less than a preset threshold, the first printing area is updated according to the location of the surface defect, and if it is within the printable range, the target pattern is printed in the updated area, otherwise the current object to be printed is eliminated. The present invention takes into account the relationship between the defects in the printing area and the printing quality, and reduces the impact of the defects on the printing quality through the correction of the printing area, improves the resource utilization rate, and saves production costs.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal transfer machine production control, and in particular to a thermal transfer machine production line processing operation control method and system. Background Art

[0002] In traditional thermal transfer machine production lines, manual or semi-automatic methods are usually used to control various parameters in the production process. This method has certain limitations, such as inaccurate parameter settings, poor speed matching leading to low production efficiency, low product qualification rate, and difficulty in achieving high-quality continuous production. The quality inspection of printed products mainly relies on manual inspection after printing, which is time-consuming and labor-intensive, with low production efficiency and high rework costs. In addition, due to the lack of material evaluation before printing, it is impossible to optimize the control of the printing process, which ultimately leads to a low yield rate, which not only wastes a lot of resources, but also seriously affects the production efficiency of the entire production line. Summary of the invention

[0003] In order to solve at least one of the above-mentioned technical problems, the present invention provides a method and system for controlling the processing operation of a thermal transfer machine production line.

[0004] In a first aspect, the present invention provides a method for controlling the processing and operation of a thermal transfer machine production line, the method comprising:

[0005] Configure the operating parameters of each device in the thermal transfer machine production line, including the feeding speed of the feeder, the printing temperature and printing speed of the thermal printer;

[0006] Preheat the thermal printer to the printing temperature, match the feeding speed with the printing speed, and when the matching is successful, start the feeding machine to transport the items to be printed to the printing position of the thermal printer;

[0007] The image of the object to be printed located at the printing position is collected in real time, and the placement position of the object to be printed is automatically corrected according to the image to determine the printable range and the first printing area of ​​the object to be printed;

[0008] Performing surface defect recognition on the first printing area, and when a surface defect is recognized, calculating a correlation between the surface defect and the printing quality;

[0009] When it is determined that the correlation is greater than a preset threshold, the first printing area is updated according to the location of the surface defect to generate a second printing area; it is determined whether the second printing area is within the printable range; if so, the target pattern is printed in the second printing area to generate a second type of printed product; if not, the current item to be printed is discarded and marked as waste.

[0010] Preferably, after generating the second type of printed matter, the method further includes:

[0011] The actual bonding force between the target pattern and the printed object in the second type of printed matter is obtained, and the printing temperature is adaptively adjusted according to the actual bonding force and the ideal bonding force, including:

[0012] Determine the initial printing temperature of the thermal transfer machine:

[0013] T0=T b +k(T e -T c );

[0014] Where T0 represents the initial printing temperature, T b Indicates the best ideal printing temperature for printed materials, T e Indicates the ambient temperature, T c Indicates the temperature of the material itself during the transportation of the printed article; k represents the temperature response proportional factor, which satisfies 0 <k<0.1;

[0015] Determine the printing temperature after adaptive adjustment:

[0016]

[0017] Where, T n Indicates the adjusted printing temperature, A r , A l They represent the actual bonding force and ideal bonding force of the finished paper bag handle, α represents the thermal expansion coefficient of the printed material itself, and ΔT e represents the temperature change value, β is a constant, and satisfies 0<β<0.1.

[0018] Preferably, the method further comprises:

[0019] Updated and adjusted holding time of printing temperature:

[0020]

[0021] In the formula, t n represents the insulation time after the update, t0 represents the insulation time before the update, T min is the lowest effective temperature for printing, T max It is the highest effective temperature for printing.

[0022] Preferably, the calculating the correlation between surface defects and printing quality comprises:

[0023] According to the defect identification results, different types of defects are classified;

[0024] Determine a printing quality impact index for each defect type, wherein the printing quality impact index includes defect area ratio, defect density, and defect position;

[0025] The printing quality influencing index is input into a preset prediction model to predict the correlation between different defect types and printing quality; the prediction model is obtained based on the training of a neural network model.

[0026] Preferably, the method further comprises:

[0027] When no surface defects are identified, printing a target pattern in a first printing area to generate a type of printed product;

[0028] When it is determined that the correlation is less than or equal to the preset threshold, printing the target pattern in the first printing area to generate a second type of printed product;

[0029] Among them, the quality level of Class I printed materials is higher than that of Class II printed materials.

[0030] In a second aspect, the present invention further provides a thermal transfer machine production line processing operation control system, the system comprising:

[0031] A parameter configuration unit, used to configure the operating parameters of each device in the thermal transfer machine production line, the operating parameters including the feeding speed of the feeder, the printing temperature and printing speed of the thermal printer;

[0032] The speed matching unit is used to preheat the thermal printer to the printing temperature, match the feeding speed with the printing speed, and start the feeding machine to transport the items to be printed to the printing position of the thermal printer when the matching is successful;

[0033] An automatic deviation correction unit is used to collect an image of the article to be printed at the printing position in real time, automatically correct the placement position of the article to be printed according to the image, and determine the printable range and the first printing area of ​​the article to be printed;

[0034] A defect recognition unit, used to recognize surface defects of the first printing area, and when a surface defect is recognized, calculate the correlation between the surface defect and the printing quality;

[0035] The printing control unit is used to update the first printing area according to the location of the surface defect to generate a second printing area when it is determined that the correlation is greater than a preset threshold; determine whether the second printing area is within the printable range; if so, print the target pattern in the second printing area to generate a second type of printed product; if not, eliminate the current item to be printed and mark it as waste.

[0036] In a third aspect, the present invention further provides an electronic device comprising a processor and a memory, wherein the memory is used to store computer program code, and the computer program code comprises computer instructions. When the processor executes the computer instructions, the electronic device executes the method as described in the first aspect above and any possible implementation thereof.

[0037] In a fourth aspect, the present invention further provides a computer-readable storage medium, wherein a computer program is stored in the computer-readable storage medium, wherein the computer program includes program instructions, and when the program instructions are executed by a processor of an electronic device, the processor executes the method as described in the first aspect above and any possible implementation thereof.

[0038] Compared with the prior art, the present invention has the following beneficial effects:

[0039] 1) The present invention first configures the operating parameters of each device in the thermal transfer machine production line, wherein the operating parameters include the loading speed of the feeder, the printing temperature and the printing speed of the thermal printer; the thermal printer is preheated to the printing temperature, the loading speed and the printing speed are matched, and when the match is successful, the feeder is started to transport the items to be printed to the printing position of the thermal printer; through the precise configuration of the equipment operating parameters and the effective matching of the speed, the overall operating efficiency of the production line is significantly improved.

[0040] 2) The present invention will collect images of the items to be printed at the printing position in real time, automatically correct the placement of the items to be printed based on the images, and determine the printable range and the first printing area of ​​the items to be printed; because deviations may occur in the actual feeding process, automatic correction can be used to accurately locate the printing area before printing, thereby improving printing quality.

[0041] 3) After determining the printable range and the first printing area of ​​the article to be printed, the present invention will identify surface defects in the first printing area. When the surface defects are identified, the correlation between the surface defects and the printing quality is calculated; when it is determined that the correlation is greater than the preset threshold, the first printing area is updated according to the location of the surface defects to generate the second printing area; it is determined whether the second printing area is within the printable range; if so, the target pattern is printed in the second printing area to generate the second type of printed product; if not, the current article to be printed is discarded and marked as waste. When the surface defects are not identified, the target pattern is printed in the first printing area to generate a type of printed product; when it is determined that the correlation is less than or equal to the preset threshold, the target pattern is printed in the first printing area to generate the second type of printed product. Therefore, by identifying the surface defects before printing, the situation of defective products caused by surface defects can be reduced, thereby improving the yield rate. By considering the correlation between the defect type and the printing quality, the printing area determined at the beginning is updated, so that the printed product can meet the situation where the quality requirements are not so high, thereby greatly improving the resource utilization rate and saving production costs.

[0042] It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the background technology, the drawings required for use in the embodiments of the present invention or the background technology will be described below.

[0044] The drawings herein are incorporated into the specification and constitute a part of the specification. These drawings illustrate embodiments consistent with the present disclosure and are used to illustrate the technical solutions of the present disclosure together with the specification.

[0045] Figure 1 A schematic flow chart of a thermal transfer machine production line processing operation control method provided by an embodiment of the present invention;

[0046] Figure 2 A schematic diagram of the positional relationship between a printable range and a first printing area is provided for an embodiment of the present invention;

[0047] Figure 3 The embodiment of the present invention provides Figure 1 A schematic flow chart of the sub-steps of step S40;

[0048] Figure 4 A schematic flow chart of a method for controlling the processing and operation of a thermal transfer machine production line provided by another embodiment of the present invention;

[0049] Figure 5 A schematic diagram of the structure of a thermal transfer machine production line processing operation control system provided by an embodiment of the present invention;

[0050] Figure 6 A schematic structural diagram of a thermal transfer machine production line processing operation control system provided by another embodiment of the present invention. DETAILED DESCRIPTION

[0051] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings 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.

[0052] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0053] At present, most thermal transfer machine production lines use manual or semi-automatic methods to control the production process, so production efficiency and quality cannot be guaranteed. For the printing process, due to the lack of material evaluation before printing, the product quality is only inspected after printing to determine whether it is qualified. In this way, the printing strategy cannot be adjusted in time, resulting in a large amount of resource waste. To this end, the present invention aims to provide a thermal transfer machine production line processing and operation control method. Through parameter control and matching, the correlation between printing area defects and printing quality is considered before printing, so that the printing strategy can be optimized in time, which ultimately greatly improves the resource utilization rate and yield rate, and increases the production and processing energy efficiency of the production line.

[0054] See also Figure 1 , Figure 1 The present invention provides a flow chart of a thermal transfer machine production line processing operation control method. Figure 1 As shown, the method includes:

[0055] S10, configuring the operating parameters of each device in the thermal transfer machine production line, wherein the operating parameters include the feeding speed of the feeder, the printing temperature and the printing speed of the thermal printer.

[0056] In this embodiment, key parameters such as the loading speed of the feeder, the printing temperature and printing speed of the thermal printer are pre-set according to the production process requirements and material properties. During configuration, the production line parameters of the historical processing and printing related to the current material can be matched from the database based on the material's own properties, and then the parameter configuration process is completed using the historical parameters as a reference. When screening the data of historical cases, a clustering algorithm can be used for matching, and the solution with the highest matching degree is used as the final reference case to initialize the operating parameters of each device in the thermal transfer machine production line.

[0057] S20, preheating the thermal printer to a printing temperature, matching the feeding speed with the printing speed, and when the matching is successful, starting the feeding machine to transport the article to be printed to the printing position of the thermal printer.

[0058] When preheating the thermal printer, the temperature must first be set, that is, the preheating temperature of the thermal printer must be set according to the material properties of the items to be printed and the printing requirements. Then, a temperature sensor is used to monitor the heating temperature of the thermal printer in real time to ensure that the temperature reaches the predetermined printing temperature, so that the printing quality can be guaranteed. Preferably, in order to speed up production efficiency, the preheating step can be performed after configuring the parameters and before preparing the materials. For example, if a batch of clothes is to be pattern printed, the thermal transfer machine can be preheated during the material preparation period for transportation and inspection of the clothes. The preheating start time is determined based on the start of feeding. For example, the printing temperature can be reached after preheating for 5 minutes, and it takes 30 minutes to prepare the materials. Then, the thermal printer can be started for preheating at the 25th minute of preparing the materials. When the material preparation is completed, the material can be fed through the feeder to enter the printing process.

[0059] Furthermore, in order to ensure the stable operation of the production line, the present embodiment will match the feeding speed with the printing speed, and only when the matching is successful will the feeding machine be started to convey the items to be printed to the printing position of the thermal printer. The printing position generally refers to the material placement position facing the thermal transfer head, and generally requires a precise positioning system to ensure that the items to be printed accurately reach the printing position of the thermal printer.

[0060] Specifically, speed matching includes:

[0061] Speed ​​setting: Set the feeding speed of the loader and the printing speed of the thermal printer according to the preheating temperature and the actual operation of the production line.

[0062] Speed ​​monitoring: Use sensors to monitor loading speed and printing speed to ensure a good match between the two.

[0063] Speed ​​Adjustment: If a speed mismatch is detected, automatically adjust the speed of the loader or printer to ensure a smooth transition of materials.

[0064] S30, collecting images of the object to be printed located at the printing position in real time, automatically correcting the placement position of the object to be printed according to the images, and determining the printable range and the first printing area of ​​the object to be printed.

[0065] During the feeding process of the loader, due to the properties of the material itself, such as insufficient contact adhesion with the conveying mechanism, the position after transmission will deviate from the contact position when it is first fed into the loader. In this way, when entering the printing position, the placement of the material will deviate from the ideal printing position. Therefore, it is necessary to automatically correct the placement position of the printed object to ensure that the pattern is printed in the area of ​​the object to be printed.

[0066] In a specific embodiment, automatically correcting the placement position of the printed article includes:

[0067] 1) Real-time image acquisition: Use a high-precision camera to capture the image of the object to be printed at the printing position in real time, and then automatically identify the position deviation of the object to be printed through image processing technology.

[0068] 2) Automatic correction: According to the results of image processing, the position of the object to be printed is automatically adjusted to ensure its accurate alignment, and the position of the object to be printed is confirmed to be accurately aligned through sensors or visual systems.

[0069] 3) Determination of printable range: The appropriate printable range can be automatically calculated based on the size and shape of the object to be printed, and the printable range can also be set in advance based on the template that is first set. Figure 2 A schematic diagram of the positional relationship between the printable range and the first printing area is provided. Figure 2 As shown, for example, the printed pattern is at the center of the clothing near the chest, and this area is used as the printable area, and the first printing area is usually within this printable range. Figure 2 In the figure, the rectangular area is filled with grayscale. It can also be understood that the printable range of the same batch of printed articles should be the same, and for the printed products of the same quality batch, the first printing area should also be kept consistent.

[0070] S40, performing surface defect recognition on the first printing area, and when a surface defect is recognized, calculating the correlation between the surface defect and the printing quality.

[0071] If there are defects in the printing area, it will have a certain impact on the printing quality. For example, defects that will obviously affect the printing quality include unevenness, large scratches, oil stains or stains, cracks and deformations, while defects with less impact may include slight scratches, slight color differences or deformations. Therefore, this embodiment aims to identify and classify defect types, consider their impact on printing quality, and thus optimize and adjust printing strategies.

[0072] Specifically, the following steps are included when performing defect identification:

[0073] 1) Image acquisition: Acquire a high-quality image of the first printing area.

[0074] 2) Image preprocessing: Use filters to clean up image noise, enhance image contrast or brightness to highlight features, and standardize images by correcting images such as tilt, rotation, or scaling.

[0075] 3) Feature extraction: Use edge detection algorithm to identify the boundaries of the printed pattern, further calculate texture features, such as gray-level co-occurrence matrix or other statistical features. Then use SIFT algorithm to extract key feature points.

[0076] 4) Defect classification: Use deep learning models such as support vector machines and convolutional neural networks to identify known types of defects. Then further use clustering algorithms such as K-means to classify unknown defects.

[0077] After the surface defects of the printed object are identified and classified, it is further necessary to calculate the correlation between the surface defects and the printing quality.

[0078] See also Figure 3 In one embodiment, the calculating the correlation between surface defects and printing quality comprises:

[0079] S401. Classify different types of defects according to defect identification results.

[0080] Based on the defect recognition results, we first need to classify various types of surface defects. Then we define defect categories, such as scratches, stains, color difference, missing parts, etc. Finally, we annotate the data set, prepare enough sample data for each defect category, and mark them.

[0081] S402 , determining a printing quality influencing index for each defect type, wherein the printing quality influencing index includes a defect area ratio, a defect density, and a defect position.

[0082] Defect area ratio: Calculate the ratio of each defect to its area.

[0083] Defect density: Count the number of defects per unit area.

[0084] Defect Location: Records information about the location of the defect relative to the print, which may affect the overall quality of the print.

[0085] S403, inputting the printing quality influencing index into a preset prediction model to predict the correlation between different defect types and printing quality; the prediction model is obtained based on the training of a neural network model.

[0086] Build a neural network model: Choose a suitable neural network architecture, including but not limited to convolutional neural networks, random forests, support vector machines, and other models suitable for this task.

[0087] Feature vectorization: Convert the indicators obtained in the above steps into numerical features as input to the model.

[0088] Training model: Use labeled datasets to train the model, adjust model parameters through back propagation, and minimize the loss function.

[0089] Evaluate the model: Use the validation set to evaluate the model performance and adjust the hyperparameters to optimize the model performance.

[0090] Application model: Input new printing quality influencing indicators into the trained model to predict the correlation between different defect types and printing quality.

[0091] Therefore, through this embodiment, the correlation between the surface defects of the object to be printed and the printing quality can be quickly and accurately evaluated, thereby providing a basis for the subsequent printing strategy adjustment process.

[0092] S50. When it is determined that the correlation is greater than a preset threshold, the first printing area is updated according to the location of the surface defect to generate a second printing area; whether the second printing area is within the printable range is determined; if so, the target pattern is printed in the second printing area to generate a second type of printed product; if not, the current item to be printed is discarded and marked as waste.

[0093] Existing printing quality inspections are usually carried out after the printed product is obtained. If obvious printing defects are found, the product may be directly discarded. Figure 2 For example, assuming that a defect with a correlation with printing quality greater than a preset threshold is identified in the first printing area, if printing is directly performed in the first printing area, then the subsequent quality inspection will most likely fail and the product will be marked as waste, which will result in a large amount of resource waste.

[0094] Therefore, in this embodiment, when it is determined that the correlation is greater than a preset threshold, the first printing area is updated according to the location of the surface defect to generate a second printing area. Figure 2 , assuming that a defect is identified in the first printing area, such as Figure 2 As shown in the black circular area in the figure, this defect will be avoided when the second printing area is locked, that is, the defect will be avoided by translating according to the same area as the first printing area. Figure 2 The second printing area is a dotted rectangular area without filling.

[0095] After obtaining the second printing area, it is necessary to determine whether it is still within the printable range; if so, the target pattern can be printed in the updated second printing area and a second-class printed product can be generated. This is because the printing at this time has surface defects compared to the surface-free printed product. Although the printing position is still within the printable range and the visual deviation is small, there is still a deviation, so the printing grade is marked as a second-class printed product. However, if the second printing area exceeds the printable range after the update, including partial and full excess, it means that the effective printing process cannot be completed at this time, that is, direct printing will exceed the originally locked printable range, resulting in obvious visual deviations. At this time, the current items to be printed should be discarded and marked as waste. It should be noted that Figure 2This is just a simple example, and usually the first printing area contains more than one defect. When more defects are detected in the first printing area, it is necessary to consider how to avoid the influence of these defects during the update, so as to more accurately lock the position of the second printing area.

[0096] In this way, by evaluating the surface defects of the material itself before printing, the printing area can be effectively updated. Compared with the unified quality inspection after printing to eliminate a large number of unqualified finished products, this method can detect problems and respond in time, and by adjusting the printing strategy in time, the utilization rate of materials is greatly improved, and the yield rate is ultimately improved, saving production costs.

[0097] The above embodiment considers the situation that a surface defect is identified in the first printing area, and the correlation between the defect and the printing quality is greater than a preset threshold. In one embodiment, when there is no defect on the surface, or the correlation is less than or equal to the preset threshold, other printing strategies need to be matched.

[0098] See also Figure 4 In one embodiment, the method further comprises:

[0099] S60, when no surface defects are identified, printing a target pattern in a first printing area to generate a type of printed product;

[0100] S70. When it is determined that the correlation is less than or equal to the preset threshold, the target pattern is printed in the first printing area to generate a second type of printed product; wherein the quality level of the first type of printed product is higher than that of the second type of printed product.

[0101] It is understandable that if there are no surface defects, it means that the target pattern can be directly printed in the first printing area. The finished product generated at this time is of better quality than the aforementioned Class II printed products because there are no surface defects and the printing position has not moved, so Class I printed products should be generated. However, when the defect correlation is determined to be less than or equal to the preset threshold after the defect is identified, because the defect correlation is small, that is, direct printing has little effect on the final printing effect, in order to improve efficiency, the target pattern can be directly printed in the first printing area. Due to certain defects, Class II printed products will be generated;

[0102] In summary, this embodiment takes into account different situations of identifying surface defects and matches reasonable printing strategies for different situations, thereby greatly improving the utilization rate of material resources and saving production costs. In addition, this embodiment can directly mark the finished product grade during the production process, so that the finished products can be quickly classified for subsequent operations after printing. This also greatly improves production efficiency and reduces manpower and material costs.

[0103] Controlling the printing temperature and holding time is critical to the quality and durability of the final product. The general temperature range for thermal transfer is between 160℃ and 180℃. But this range may vary depending on the material and application. Different materials have different heat resistance and chemical properties, so the required temperature will also vary. For example, some thermal transfer papers may require higher temperatures to ensure a good transfer effect. The holding time is usually between a few seconds and a minute. For example, some applications may only take 25 seconds, while other applications may take 60 seconds or more. The holding time also needs to be adjusted according to the materials and transfer papers used. Some materials may require a shorter holding time to avoid overheating damage. There is a mutual dependence between temperature and holding time. Higher temperatures usually mean that shorter holding times can be used, and vice versa. This balance needs to be determined based on the specific materials and target effects. Thermal transfer machines usually have a temperature adjustment function, which can adjust the appropriate temperature and settings according to specific applications and materials. However, the current methods are mostly based on manual experience, and these parameters cannot be accurately controlled, thus affecting the final printing quality. For this reason, in one embodiment, the printing quality is further improved by accurately controlling the printing temperature and insulation time.

[0104] Preferably, after generating the second type of printed matter, the method further includes:

[0105] The actual bonding force between the target pattern and the printed object in the second type of printed matter is obtained, and the printing temperature is adaptively adjusted according to the actual bonding force and the ideal bonding force, including:

[0106] Determine the initial printing temperature of the thermal transfer machine:

[0107] T0=T b +k(T e -T c );

[0108] Where T0 represents the initial printing temperature, T b Indicates the best ideal printing temperature for printed materials, T e Indicates the ambient temperature, T c Indicates the temperature of the material itself during the transportation of the printed article; k represents the temperature response proportional factor, which satisfies 0 <k<0.1;

[0109] Determine the printing temperature after adaptive adjustment:

[0110]

[0111] Where, T n Indicates the adjusted printing temperature, A r , A lThey represent the actual bonding force and ideal bonding force of the finished paper bag handle, α represents the thermal expansion coefficient of the printed material itself, and ΔT e represents the temperature change value, β is a constant, and satisfies 0<β<0.1.

[0112] Preferably, the insulation time of the updated adjusted printing temperature is:

[0113]

[0114] In the formula, t n represents the insulation time after the update, t0 represents the insulation time before the update, T min is the lowest effective temperature for printing, T max It is the highest effective temperature for printing.

[0115] It should be noted that when the actual bonding force is close to the ideal bonding force, the printing temperature will be close to the printing temperature before the update. When the actual bonding force is far from the ideal bonding force, the printing temperature will be adjusted according to the change of the thermal expansion coefficient and the logarithmic function. In this way, the printing temperature can be adjusted according to the change of the bonding force to achieve the purpose of optimizing the printing quality effect.

[0116] Generally, if the actual adhesion is lower than the ideal adhesion, it means that the printed pattern of the thermal transfer is not fully attached to the material. In this case, the adhesion can be improved by increasing the printing temperature. On the contrary, if the actual adhesion is higher than the ideal adhesion, it means that the temperature is too high or the time is too long during the printing process, resulting in unnecessary physical or chemical changes in the pattern or material itself. At this time, the printing temperature should be lowered or the insulation time should be reduced. If the two values ​​are the same, it means that the printing temperature does not need to be adjusted. Therefore, the above formula can be used to determine the updated size of the printing temperature for the three situations where the actual adhesion is lower than, higher than, and equal to the ideal adhesion.

[0117] In the above formula, The value of is usually less than 1. The holding time is usually inversely proportional to the printing temperature, which means that the higher the temperature, the shorter the holding time, and vice versa. In this way, the holding time can be adjusted according to the changes in the printing temperature to achieve the best printing effect. Therefore, by dynamically adjusting the printing temperature and the holding time, it can be ensured that the printing process reaches the ideal state, thereby improving the quality of the finished product. At the same time, by accurately adjusting the printing temperature and the holding time, energy waste can be reduced and production costs can be reduced. Therefore, when printing, this embodiment realizes self-learning of the production control process by feedback and optimization of the printing temperature and the holding time parameters, greatly improving the yield and the quality of the finished product, and increasing the production energy efficiency.

[0118] In summary, the embodiments of the present invention can at least achieve the following beneficial effects:

[0119] 1) The present invention first configures the operating parameters of each device in the thermal transfer machine production line, wherein the operating parameters include the loading speed of the feeder, the printing temperature and the printing speed of the thermal printer; the thermal printer is preheated to the printing temperature, the loading speed and the printing speed are matched, and when the match is successful, the feeder is started to transport the items to be printed to the printing position of the thermal printer; through the precise configuration of the equipment operating parameters and the effective matching of the speed, the overall operating efficiency of the production line is significantly improved.

[0120] 2) The present invention will collect images of the items to be printed at the printing position in real time, automatically correct the placement of the items to be printed based on the images, and determine the printable range and the first printing area of ​​the items to be printed; because deviations may occur in the actual feeding process, automatic correction can be used to accurately locate the printing area before printing, thereby improving printing quality.

[0121] 3) After determining the printable range and the first printing area of ​​the article to be printed, the present invention will identify surface defects in the first printing area. When the surface defects are identified, the correlation between the surface defects and the printing quality is calculated; when it is determined that the correlation is greater than the preset threshold, the first printing area is updated according to the location of the surface defects to generate the second printing area; it is determined whether the second printing area is within the printable range; if so, the target pattern is printed in the second printing area to generate the second type of printed product; if not, the current article to be printed is discarded and marked as waste. When the surface defects are not identified, the target pattern is printed in the first printing area to generate a type of printed product; when it is determined that the correlation is less than or equal to the preset threshold, the target pattern is printed in the first printing area to generate the second type of printed product. Therefore, by identifying the surface defects before printing, the situation of defective products caused by surface defects can be reduced, thereby improving the yield rate. By considering the correlation between the defect type and the printing quality, the printing area determined at the beginning is updated, so that the printed product can meet the situation where the quality requirements are not so high, thereby greatly improving the resource utilization rate and saving production costs.

[0122] See also Figure 5 In one embodiment, the present invention further provides a thermal transfer machine production line processing operation control system, the system comprising:

[0123] The parameter configuration unit 100 is used to configure the operating parameters of each device in the thermal transfer machine production line, wherein the operating parameters include the feeding speed of the feeder, the printing temperature and the printing speed of the thermal printer;

[0124] The speed matching unit 200 is used to preheat the thermal printer to the printing temperature, match the feeding speed with the printing speed, and start the feeding machine to transport the article to be printed to the printing position of the thermal printer when the matching is successful;

[0125] The automatic deviation correction unit 300 is used to collect an image of the object to be printed at the printing position in real time, automatically correct the placement position of the object to be printed according to the image, and determine the printable range and the first printing area of ​​the object to be printed;

[0126] The defect recognition unit 400 is used to recognize surface defects in the first printing area, and when a surface defect is recognized, calculate the correlation between the surface defect and the printing quality;

[0127] The printing control unit 500 is used to update the first printing area according to the location of the surface defect to generate a second printing area when it is determined that the correlation is greater than a preset threshold; determine whether the second printing area is within the printable range; if so, print the target pattern in the second printing area to generate a second type of printed product; if not, discard the current item to be printed and mark it as waste.

[0128] In one embodiment, the defect identification unit 400 is further configured to:

[0129] Calculate the correlation between surface defects and print quality, including:

[0130] According to the defect identification results, different types of defects are classified;

[0131] Determine a printing quality impact index for each defect type, wherein the printing quality impact index includes defect area ratio, defect density, and defect position;

[0132] The printing quality influencing index is input into a preset prediction model to predict the correlation between different defect types and printing quality; the prediction model is obtained based on the training of a neural network model.

[0133] In one embodiment, the printing control unit 500 is further configured to:

[0134] The actual bonding force between the target pattern and the printed object in the second type of printed matter is obtained, and the printing temperature is adaptively adjusted according to the actual bonding force and the ideal bonding force, including:

[0135] Determine the initial printing temperature of the thermal transfer machine:

[0136] T0=T b +k(T e -T c );

[0137] Where T0 represents the initial printing temperature, T bIndicates the best ideal printing temperature for printed materials, T e Indicates the ambient temperature, T c Indicates the temperature of the material itself during the transportation of the printed article; k represents the temperature response proportional factor, which satisfies 0 <k<0.1;

[0138] Determine the printing temperature after adaptive adjustment:

[0139]

[0140] Where, T n Indicates the adjusted printing temperature, A r , A l They represent the actual bonding force and ideal bonding force of the finished paper bag handle, α represents the thermal expansion coefficient of the printed material itself, and ΔT e represents the temperature change value, β is a constant, and satisfies 0<β<0.1.

[0141] Updated and adjusted holding time of printing temperature:

[0142]

[0143] In the formula, t n represents the insulation time after the update, t0 represents the insulation time before the update, T min is the lowest effective temperature for printing, T max It is the highest effective temperature for printing.

[0144] See also Figure 6 In one embodiment, the system further comprises:

[0145] A type-one printing unit 600 is used to print a target pattern in a first printing area to generate a type-one printed product when no surface defect is identified;

[0146] The second type printing unit 700 is used to print the target pattern in the first printing area to generate the second type of printed product when it is determined that the correlation is less than or equal to the preset threshold.

[0147] It can be understood that the functions or modules included in the system provided in this embodiment can be used to execute the method described in the above method embodiment. Its specific implementation can refer to the description of the above method embodiment. For the sake of brevity, it will not be repeated here.

[0148] The present invention also provides an electronic device, including a processor and a memory, wherein the memory is used to store computer program code, and the computer program code includes computer instructions. When the processor executes the computer instructions, the electronic device executes the thermal transfer machine production line processing operation control method as described in any of the above embodiments.

[0149] The present invention also provides a computer-readable storage medium, in which a computer program is stored. The computer program includes program instructions. When the program instructions are executed by a processor of an electronic device, the processor executes the thermal transfer machine production line processing operation control method as described in any of the above embodiments.

[0150] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0151] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. Those skilled in the art can also clearly understand that the descriptions of the various embodiments of the present invention have different focuses. For the convenience and brevity of description, the same or similar parts may not be repeated in different embodiments. Therefore, for parts not described or not described in detail in a certain embodiment, refer to the records of other embodiments.

Claims

1. A thermal transfer machine production line processing operation control method, characterized in that: The method comprises: Configure the operating parameters of each device in the thermal transfer machine production line, including the feeding speed of the feeder, the printing temperature and printing speed of the thermal transfer machine; Preheat the thermal transfer machine to the printing temperature, match the feeding speed with the printing speed, and when the matching is successful, start the feeding machine to transport the items to be printed to the printing position of the thermal transfer machine; The image of the object to be printed located at the printing position is collected in real time, and the placement position of the object to be printed is automatically corrected according to the image to determine the printable range and the first printing area of ​​the object to be printed; Performing surface defect recognition on the first printing area, and when a surface defect is recognized, calculating a correlation between the surface defect and the printing quality; When it is determined that the correlation is greater than a preset threshold, the first printing area is updated according to the location of the surface defect to generate a second printing area; it is determined whether the second printing area is within the printable range; if so, the target pattern is printed in the second printing area to generate a second type of printed product; if not, the current item to be printed is discarded and marked as waste.

2. The thermal transfer machine production line processing operation control method according to claim 1 is characterized in that: After generating the second type of printed matter, the method further includes: The actual bonding force between the target pattern and the object to be printed in the second type of printed matter is obtained, and the printing temperature is adaptively adjusted according to the actual bonding force and the ideal bonding force, including: Determine the initial printing temperature of the thermal transfer machine: T0=T b +k(T e -T c ); Where T0 represents the initial printing temperature, T b Indicates the best ideal printing temperature of the material to be printed, T e Indicates the ambient temperature, T c represents the temperature of the material itself during the transportation of the printed object; k represents the temperature response proportional factor, which satisfies 0 <k<0.1; Determine the printing temperature after adaptive adjustment: Where, T n Indicates the adjusted printing temperature, A r , A l They represent the actual bonding force and ideal bonding force between the target pattern and the object to be printed, α represents the thermal expansion coefficient of the material of the object to be printed, and ΔT e represents the temperature change value, β is a constant, and satisfies 0<β<0.

1.

3. The thermal transfer machine production line processing operation control method according to claim 2, characterized in that: The method further comprises: Updated and adjusted holding time of printing temperature: In the formula, t n represents the insulation time after the update, t0 represents the insulation time before the update, T min is the lowest effective temperature for printing, T max It is the highest effective temperature for printing.

4. The thermal transfer machine production line processing operation control method according to claim 1, characterized in that: The calculation of the correlation between surface defects and printing quality includes: According to the defect identification results, different types of defects are classified; Determine a printing quality impact index for each defect type, wherein the printing quality impact index includes defect area ratio, defect density, and defect position; The printing quality influencing index is input into a preset prediction model to predict the correlation between different defect types and printing quality; the prediction model is obtained based on the training of a neural network model.

5. The thermal transfer machine production line processing operation control method according to claim 1, characterized in that: The method further comprises: When no surface defects are identified, printing a target pattern in a first printing area to generate a type of printed product; When it is determined that the correlation is less than or equal to the preset threshold, printing the target pattern in the first printing area to generate a second type of printed product; Among them, the quality level of Class I printed materials is higher than that of Class II printed materials.

6. A thermal transfer machine production line processing operation control system, characterized in that: The system comprises: A parameter configuration unit, used to configure the operating parameters of each device in the thermal transfer machine production line, the operating parameters including the feeding speed of the feeder, the printing temperature and printing speed of the thermal transfer machine; The speed matching unit is used to preheat the thermal transfer machine to the printing temperature, match the feeding speed with the printing speed, and start the feeding machine to transport the items to be printed to the printing position of the thermal transfer machine when the matching is successful; An automatic deviation correction unit is used to collect an image of the article to be printed at the printing position in real time, automatically correct the placement position of the article to be printed according to the image, and determine the printable range and the first printing area of ​​the article to be printed; A defect recognition unit, used to recognize surface defects of the first printing area, and when a surface defect is recognized, calculate the correlation between the surface defect and the printing quality; The printing control unit is used to update the first printing area according to the location of the surface defect to generate a second printing area when it is determined that the correlation is greater than a preset threshold; determine whether the second printing area is within the printable range; if so, print the target pattern in the second printing area to generate a second type of printed product; if not, eliminate the current item to be printed and mark it as waste.

7. An electronic device, characterized in that: It includes a processor and a memory, the memory is used to store computer program code, the computer program code includes computer instructions, when the processor executes the computer instructions, the electronic device executes the thermal transfer machine production line processing operation control method as described in any one of claims 1 to 5.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, which includes program instructions. When the program instructions are executed by a processor of an electronic device, the processor executes the thermal transfer machine production line processing operation control method according to any one of claims 1 to 5.

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