Tension adjusting method for silk-screen printing

Abstract

The invention provides a tension adjusting method for silk-screen printing, which belongs to the technical field of tension adjustment and comprises the following steps: step 1, acquiring relevant parameters in a silk-screen printing process, and determining influence factors of tension in the silk-screen printing process; 2, the type and the structure of the printing machine are obtained, and a corresponding tension measuring instrument is determined according to the type and the structure; 3, the stretching state and position change of the silk screen are monitored in real time according to a tension measuring instrument, and abnormal tension is determined based on influence factors according to the stretching state and position change; and 4, abnormal parameters of the printing machine are determined according to the abnormal tension, and the tension of silk-screen printing is adjusted based on the printing task of the printed product and the ink type. The problems that due to the fact that obvious stretching and compression occur in the printing process of a silk-screen printing product, tension is not uniform, and meanwhile according to a traditional tension adjusting method, tension adjusting needs to be conducted frequently and printing conditions meeting a printing task need to be reset, and the image quality and precision of silk-screen printing are reduced are solved.

Description

Technical Field

[0001] The invention relates to the technical field of tension adjustment, and in particular to a tension adjustment method for screen printing. Background Art

[0002] Screen printing, as a common printing process, is widely used in industries such as textiles and electronics.

[0003] However, in the existing tension adjustment method for screen printing, the tension of the screen substrate is usually adjusted by a mechanical roller. This method may cause the screen substrate to be significantly stretched and compressed during the printing process, resulting in uneven tension, thereby affecting the printing quality and output. At the same time, the traditional tension adjustment method requires frequent tension adjustment and re-setting of printing conditions that meet the printing task, resulting in low printing efficiency and unstable printing quality, and reducing the image quality and accuracy of screen printing.

[0004] Therefore, the present invention provides a tension adjustment method for screen printing. Summary of the invention

[0005] The present invention provides a tension adjustment method for screen printing, which is used to solve the problem that in the prior art, the tension of a screen printing product is usually adjusted by a mechanical roller. This method may cause the screen printing product to be significantly stretched and compressed during the printing process, resulting in uneven tension, thereby affecting the printing quality and output. At the same time, the traditional tension adjustment method requires frequent tension adjustment and resetting of printing conditions that meet the printing task, resulting in low printing efficiency and unstable printing quality, thereby reducing the defects of image quality and precision of screen printing.

[0006] In one aspect, the present invention provides a method for adjusting tension for screen printing, comprising: Step 1: Obtain relevant parameters in the screen printing process, and determine the influencing factors of the tension in the screen printing process according to the relevant parameters; Step 2: Obtain the type and structure of the printing press, and determine a corresponding tension measuring instrument according to the type and structure; Step 3: monitoring the stretching state and position change of the screen in real time according to the tension measuring instrument, and determining abnormal tension based on influencing factors according to the stretching state and position change; Step 4: Determine abnormal parameters of the printing press according to the abnormal tension, and adjust the tension of screen printing according to the abnormal parameters based on the printing task of the substrate and the type of ink.

[0007] According to a tension adjustment method for screen printing provided by the present invention, relevant parameters in the screen printing process are obtained, and factors affecting the tension in the screen printing process are determined according to the relevant parameters, including: Acquire the working principle of screen printing, and determine the printing data in the printing process according to the working principle; Acquire the data type of the printing data, and acquire the corresponding monitoring device according to the data type; Acquiring relevant parameters in the screen printing process according to the monitoring device; Adjust the relevant parameters to obtain the influence of the change of a single parameter on the tension during the printing process; The influence degree and manner of each parameter are determined according to the influence, and the influence factors of tension in the screen printing process are determined according to the influence degree and manner.

[0008] According to a tension adjustment method for screen printing provided by the present invention, the type and structure of the printing press are obtained, and a corresponding tension measuring instrument is determined according to the type and structure, including: Acquire the working environment and materials used by the printing press, and determine the type and structure of the printing press according to the working environment and materials used; Determining the tension range and operating speed of the printing press according to the type and structure of the printing press; The corresponding tension measuring instrument is determined according to the tension range and working speed of the printing press based on the characteristics of the printed material and the process requirements.

[0009] According to a tension adjustment method for screen printing provided by the present invention, the tension measuring instrument monitors the stretching state and position change of the screen in real time, and determines the abnormal tension based on the influencing factors according to the stretching state and position change, including: The stress and strain changes of the wire mesh during the stretching process are monitored in real time according to the tension measuring instrument; determining the stretching state and position change of the wire mesh according to the stress and strain changes; Constructing a mathematical model of the wire mesh tension variation law based on the stretching state and position variation and the influencing factors; Determine the difference between the real-time state and position change of the screen and the normal working state and position change according to the mathematical model of the screen tension change law; Whether the tension is abnormal is determined based on the difference, a set threshold and the fit of the model.

[0010] According to a tension adjustment method for screen printing provided by the present invention, an abnormal parameter of a printing press is determined according to the abnormal tension, and the tension of screen printing is adjusted according to the abnormal parameter based on the printing task of the printed product and the type of ink, including: Obtaining a sample with abnormal tension and determining the extent and nature of the problem caused by the abnormal tension based on the sample; Determine the cause of the problem according to the scope and nature of the problem, and determine the abnormal parameters of the printing press according to the cause of the problem; Determine the surface characteristics of the substrate according to the printing task of the substrate; Determine the ink characteristics and how it is deposited on the screen based on the ink type; The tension of screen printing is adjusted according to the abnormal parameters based on the surface characteristics of the substrate, the ink characteristics and the way of deposition on the screen.

[0011] According to a tension adjustment method for screen printing provided by the present invention, the surface characteristics of the substrate are determined according to the printing task of the substrate, including: Determine the printing characteristics of the substrate according to the printing task, and determine the printing texture characteristics according to the printing characteristics; Determine the roughness data distribution characteristics and the precision data distribution characteristics of the printed product according to the printing texture characteristics; Determine the quantitative description of the surface protruding texture of the substrate according to the roughness data distribution characteristics and the precision data distribution characteristics of the substrate; Determining a special image feature label, a primary image feature label, and a secondary image feature label based on the salient texture quantitative description; Respectively obtaining surface morphology information of the special image feature label, the primary image feature label, and the secondary image feature label; Acquire the corrugation information of each of the special image feature label, the primary image feature label and the secondary image feature label according to the surface morphology information; The power spectrum density function is used to quantitatively describe the ripple information, and the combination sequence of low-frequency, medium-low-frequency, medium-frequency and high-frequency inkjet signals on the surface of the printed product is determined according to the description results. determining surface edge features of each of the low-frequency, medium-low-frequency, medium-frequency, and high-frequency inkjet signals based on the combined sequence; The regional texture characteristics of the printed product surface are registered according to the edge characteristics, and the surface characteristics of the printed product are determined according to the registration results and the surface edge characteristics of the low-frequency, medium-low-frequency, medium-frequency and high-frequency inkjet signals.

[0012] According to a tension adjustment method for screen printing provided by the present invention, the surface characteristics of the substrate are determined according to the printing task of the substrate, including: Obtaining the material and type of the substrate, determining the physical and chemical properties of the substrate according to the material and type, and determining the printability of the substrate according to the chemical properties; Acquire the surface image of the substrate and automatically process the surface image based on imaging software and algorithms; Obtaining the surface morphology of the substrate based on the printability of the substrate according to the processing result; The specific treatment and surface properties required for the printing material are determined based on the surface morphology on the basis of the printing task of the printing material.

[0013] A tension adjustment method for screen printing provided by the present invention further includes: By considering the influence of relevant parameter interference factors in the printing process of substrates, a dynamic torque balance equation is constructed to express the relationship between tension and speed: ;in, represents the translational inertia of the printing press, represents the angular translation speed of the printing press, represents the damping coefficient, The radial moment of the printed product, Radius of substrate; In the actual printing process, if the substrate is a hollow cylinder, the influence of substrate thickness and substrate length on the speed is obtained, including: ;in, Indicates the effect of substrate thickness and substrate length on printing time. Indicates the thickness of the printed product. Indicates the length of the printed product. Indicates the effect of substrate thickness and substrate length on the radius, Indicates the linear translation speed of the printing press.

[0014] Compared with the prior art, the present invention has the following beneficial effects: By obtaining the real-time stretching state and position change of the screen through the tension measuring instrument, and combining the factors affecting the tension to determine the abnormal tension and adjust it, it is possible to avoid obvious stretching and compression of the screen substrate during the printing process, make the tension uniform and consistent, thereby improving the printing quality and output. At the same time, there is no need to frequently adjust the tension and reset the printing conditions that meet the printing task, which improves the printing efficiency and ensures the image quality and accuracy of the screen printing. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a schematic flow chart of a method for adjusting tension of screen printing provided by an embodiment of the present invention; Figure 2It is a flow chart of determining the influencing factors of tension in a screen printing process according to relevant parameters in the screen printing process provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are 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.

[0018] Embodiment 1: An embodiment of the present invention provides a tension adjustment method for screen printing, such as Figure 1 As shown, the method mainly includes the following steps: Step 1: Obtain relevant parameters in the screen printing process, and determine the influencing factors of the tension in the screen printing process according to the relevant parameters; Step 2: Obtain the type and structure of the printing press, and determine a corresponding tension measuring instrument according to the type and structure; Step 3: monitoring the stretching state and position change of the screen in real time according to the tension measuring instrument, and determining abnormal tension based on influencing factors according to the stretching state and position change; Step 4: Determine abnormal parameters of the printing press according to the abnormal tension, and adjust the tension of screen printing according to the abnormal parameters based on the printing task of the substrate and the type of ink.

[0019] In this embodiment, the relevant parameters in the screen printing process include: printing pressure, scraper hardness, printing speed, and printing mode.

[0020] In this embodiment, the influencing factors may be: the material of the substrate, the surface characteristics of the substrate, the fineness of the printing plate, and the pressure of the scraper.

[0021] In this embodiment, the printing presses can be classified according to different principles and uses, and the types of printing presses include: lithographic printing presses, gravure printing presses, stencil printing presses, and rotary printing presses.

[0022] In this embodiment, the structure of the printing press includes: Main structure: The main structure of the printing press usually consists of a metal frame that supports and fixes all other components.

[0023] Workbench: The workbench is usually made of wood or metal, used to carry the substrate, and can be moved up and down to accommodate substrates of different sizes.

[0024] Printing plate: Common printing plates include lithography, gravure, and screen printing.

[0025] Ink supply system: The ink supply system includes an ink pump, an ink storage tank, an ink pipeline, etc., which is responsible for extracting ink from the tank and delivering it to the print head through the pipeline.

[0026] Print head: Responsible for transferring ink from the printing plate to the substrate, the print head usually consists of one or more rollers and can be adjusted according to the size and shape of the substrate.

[0027] Scraper: Responsible for controlling the flow and pressure of ink to ensure that the ink can be transferred and printed evenly.

[0028] In this embodiment, the tension measuring instrument includes: an optical tensioner and an electronic tensioner.

[0029] In this embodiment, the stretching state of the screen refers to the stretching degree and state that the screen is subjected to during the screen printing process.

[0030] In this embodiment, the position change of the screen refers to the change of the actual position of the screen relative to the position of the printing plate during the screen printing process.

[0031] In this embodiment, the abnormal tension refers to the difference between the actual tension of the screen and the designed tension during the screen printing process.

[0032] In this embodiment, the abnormal parameters may be: printing pressure, printing speed, wear and aging of bearings, pulleys, cylinders and other components.

[0033] In this embodiment, the printing task of the substrate refers to the complexity and color depth of the substrate.

[0034] In this embodiment, the ink types include: water-based ink and solvent-based ink.

[0035] The beneficial effects of the above technical solution are: by obtaining the real-time stretching state and position change of the screen through the tension measuring instrument, and determining the abnormal tension in combination with the factors affecting the tension, and adjusting it, it is possible to avoid obvious stretching and compression of the screen substrate during the printing process, making the tension uniform and consistent, thereby improving the printing quality and output. At the same time, there is no need to frequently adjust the tension and reset the printing conditions that meet the printing task, thereby improving the printing efficiency and ensuring the image quality and accuracy of the screen printing.

[0036] Embodiment 2: Based on Example 1, the embodiment of the present invention obtains relevant parameters in the screen printing process, and determines the influencing factors of the tension in the screen printing process according to the relevant parameters, such as Figure 2 As shown, including: S01: Acquire the working principle of screen printing, and determine printing data in the printing process according to the working principle; S02: Acquire the data type of the printing data, and acquire the corresponding monitoring device according to the data type; S03: Acquiring relevant parameters in the screen printing process according to the monitoring device; S04: adjusting the relevant parameters to obtain the influence of a single parameter change on the tension during the printing process; S05: determining the influence degree and manner of each parameter according to the influence, and determining the influence factor of the tension in the screen printing process according to the influence degree and manner.

[0037] In this embodiment, the working principle of screen printing relies on the action of the screen and the scraper to achieve pattern printing.

[0038] In this embodiment, the printing data in the printing process includes: the original image data to be printed, the ink wheel speed, the ink viscosity, the nozzle height, the size, shape, material and quantity of the printed matter.

[0039] In this embodiment, the monitoring device refers to using different devices for different data, such as: Printing pressure: pressure sensor.

[0040] Printing speed: tachometer.

[0041] Scraper pressure: pressure sensor.

[0042] Pigment concentration: Spectrometer.

[0043] In this embodiment, the relevant parameters in the screen printing process include: printing pressure, scraper hardness, printing speed, and printing mode.

[0044] In this embodiment, the influence of each parameter on the printing quality varies depending on factors such as the printing process, printing materials, and printing equipment, for example: Printing pressure: Printing pressure directly affects the clarity and line quality of the printed product. Higher pressure can make the lines fuller, but it can also make the image blurry; lower pressure may cause the lines to become thinner and unclear. Within a certain range, printing pressure is proportional to the quality of the printed product, but excessive pressure will have a negative impact.

[0045] Printing speed: Printing speed determines the speed of image and text transfer on the surface of the substrate. A higher printing speed will make the image clearer, but it will also lead to a decrease in the quality of the substrate; a lower printing speed can ensure the quality of the substrate, but it will reduce production efficiency.

[0046] Ink wheel speed: The speed of the ink wheel affects the flow speed of the printing ink, which in turn affects the clarity and color performance of the printed image. Within a certain range, increasing the speed of the ink wheel can make the printing ink cover the substrate more fully and improve the image quality, but too fast will cause problems such as ink accumulation and uneven color.

[0047] In this embodiment, the influencing manner of each printing parameter includes: Printing pressure: Printing pressure is the physical force acting on the printing plate, which will affect the printing effect of the printing plate.

[0048] Printing speed: Printing speed refers to the number of printing cycles completed by a printing press per unit time, which has an important impact on printing quality.

[0049] Ink wheel speed: Ink wheel speed refers to the number of times the ink disc rotates per unit time, which affects the flow and wetting properties of the printing ink, and thus affects the clarity and quality of the printed pattern.

[0050] In this embodiment, the influencing factors may be: the material of the substrate, the surface characteristics of the substrate, the fineness of the printing plate, and the pressure of the scraper.

[0051] The beneficial effects of the above technical solution are: obtaining printing data through the working principle of the printing machine and determining the corresponding monitoring equipment can ensure the accuracy and precision of the acquired data, determine the influence of parameters on tension during the printing process, and thus determine the influencing factors, which can improve the printing quality and avoid problems such as printing burrs or unclear printing due to influencing factors.

[0052] Embodiment 3: Based on Example 2, the embodiment of the present invention obtains the type and structure of the printing press, and determines the corresponding tension measuring instrument according to the type and structure, including: Acquire the working environment and materials used by the printing press, and determine the type and structure of the printing press according to the working environment and materials used; Determining the tension range and operating speed of the printing press according to the type and structure of the printing press; The corresponding tension measuring instrument is determined according to the tension range and working speed of the printing press based on the characteristics of the printed material and the process requirements.

[0053] In this embodiment, the materials used by the printing press are mainly divided into two categories: consumable materials and non-consumable materials. The consumable materials are mainly used in the printing process, while the non-consumable materials are used for the operation and maintenance of the equipment.

[0054] In this embodiment, the printing presses can be classified according to different principles and uses, and the types of printing presses include: lithographic printing presses, gravure printing presses, stencil printing presses, and rotary printing presses.

[0055] In this embodiment, the structure of the printing press includes: Main structure: The main structure of the printing press usually consists of a metal frame that supports and fixes all other components.

[0056] Workbench: The workbench is usually made of wood or metal, used to carry the substrate, and can be moved up and down to accommodate substrates of different sizes.

[0057] Printing plate: Common printing plates include lithography, gravure, and screen printing.

[0058] Ink supply system: The ink supply system includes an ink pump, an ink storage tank, an ink pipeline, etc., which is responsible for extracting ink from the tank and delivering it to the print head through the pipeline.

[0059] Print head: Responsible for transferring ink from the printing plate to the substrate, the print head usually consists of one or more rollers and can be adjusted according to the size and shape of the substrate.

[0060] Scraper: Responsible for controlling the flow and pressure of ink to ensure that the ink can be transferred and printed evenly.

[0061] In this embodiment, the tension range of the printing press refers to the minimum and maximum tension values ​​that the screen printing product can withstand during the printing process.

[0062] In this embodiment, the working speed of the printing press refers to the ability of the printing press to complete a certain number of printed products within a unit of time.

[0063] In this embodiment, the printing substrate material generally refers to various raw materials used for printing images, texts or other patterns, including: paper, textiles, plastic films, and non-woven fabrics.

[0064] In this embodiment, determining the corresponding tension measuring instrument means, for example, that for paper-based printed products, an elasticity measuring instrument may be selected; and for non-paper materials such as plastics, an optical measuring instrument may be selected.

[0065] The beneficial effects of the above technical solution are: by determining the tension range and working speed of the printing press through the type and structure of the printing press, printing quality problems caused by unstable tension and poor ink flow can be effectively avoided, making the printed pattern clearer, more accurate and stable. At the same time, obtaining the tension range and working speed can ensure the normal operation and service life of the printing press, reduce downtime and losses caused by equipment failure, and further, determine the corresponding tension measuring instrument in combination with the characteristics of the printing material, so that the testing and analysis of material characteristics can be completed more quickly, thereby improving printing production efficiency.

[0066] Embodiment 4: Based on Example 3, the embodiment of the present invention monitors the stretching state and position change of the screen in real time according to the tension measuring instrument, and determines the abnormal tension based on the influencing factors according to the stretching state and position change, including: The stress and strain changes of the wire mesh during the stretching process are monitored in real time according to the tension measuring instrument; determining the stretching state and position change of the wire mesh according to the stress and strain changes; Constructing a mathematical model of the wire mesh tension variation law based on the stretching state and position variation and the influencing factors; Determine the difference between the real-time state and position change of the screen and the normal working state and position change according to the mathematical model of the screen tension change law; Whether the tension is abnormal is determined based on the difference, a set threshold and the fit of the model.

[0067] In this embodiment, the stress of the wire mesh during the stretching process refers to the internal stress generated by the wire mesh under the action of the stretching force.

[0068] In this embodiment, the strain change of the wire mesh during the stretching process refers to the change in the ratio of the deformation amount of the wire mesh under the action of the stretching force to the original size.

[0069] In this embodiment, the stretching state of the screen refers to the stretching degree and state that the screen is subjected to during the screen printing process.

[0070] In this embodiment, the position change of the screen refers to the change of the actual position of the screen relative to the position of the printing plate during the screen printing process.

[0071] In this embodiment, the influencing factors may be: material properties and equipment parameters.

[0072] In this embodiment, the mathematical model of the variation law of screen tension refers to a mathematical formula or equation that describes the variation of screen tension with time, position and other variables, which can better understand and predict the variation of screen tension during the printing process.

[0073] The beneficial effects of the above technical solution are: obtaining the stretching state and position change of the screen, constructing a mathematical model of the law of screen tension change, determining the difference between the real-time state and position change of the screen and the normal working state and position change, judging whether the difference is abnormal tension, being able to accurately judge the abnormal tension and make adjustments to avoid overload or fatigue of printing equipment and materials caused by abnormal tension.

[0074] Embodiment 5: Based on Example 4, the embodiment of the present invention determines the abnormal parameters of the printing press according to the abnormal tension, and adjusts the tension of the screen printing according to the abnormal parameters based on the printing task of the printed product and the type of ink, including: Obtaining a sample with abnormal tension and determining the extent and nature of the problem caused by the abnormal tension based on the sample; Determine the cause of the problem according to the scope and nature of the problem, and determine the abnormal parameters of the printing press according to the cause of the problem; Determine the surface characteristics of the substrate according to the printing task of the substrate; Determine the ink characteristics and how it is deposited on the screen based on the ink type; The tension of screen printing is adjusted according to the abnormal parameters based on the surface characteristics of the substrate, the ink characteristics and the way of deposition on the screen.

[0075] In this embodiment, the problems caused by abnormal tension may include: blurry printed patterns, rough lines, inaccurate overprinting, etc.

[0076] In this embodiment, the nature of the problem caused by abnormal tension may be: quality problem, efficiency problem, safety problem.

[0077] In this embodiment, the abnormal parameters may be: printing pressure, printing speed, wear and aging of bearings, pulleys, cylinders and other components.

[0078] In this embodiment, the surface characteristics of the printing object refer to various physical, chemical and biological properties of the surface of the printing object, such as smoothness, texture and porosity.

[0079] In this embodiment, the ink characteristics include: concentration, color, and viscosity.

[0080] In this embodiment, the ink is deposited on the screen in the following ways: random deposition, directional deposition, smooth deposition, and penetration deposition.

[0081] The beneficial effects of the above technical solution are: obtaining the scope and nature of problems caused by abnormal tension, determining the abnormal parameters of the printing machine, and adjusting the tension of screen printing based on the surface characteristics of the substrate, the ink characteristics and the way it is deposited on the screen, which can reduce printing defects caused by improper tension and improve printing efficiency. At the same time, adjusting the tension according to the characteristics of the substrate can ensure the performance of the printing machine equipment.

[0082] Embodiment 6: Based on the fifth embodiment, the embodiment of the present invention determines the surface characteristics of the substrate according to the printing task of the substrate, including: Determine the printing characteristics of the substrate according to the printing task, and determine the printing texture characteristics according to the printing characteristics; Determine the roughness data distribution characteristics and the precision data distribution characteristics of the printed product according to the printing texture characteristics; Determine the quantitative description of the surface protruding texture of the substrate according to the roughness data distribution characteristics and the precision data distribution characteristics of the substrate; Determining a special image feature label, a primary image feature label, and a secondary image feature label based on the salient texture quantitative description; Respectively obtaining surface morphology information of the special image feature label, the primary image feature label, and the secondary image feature label; Acquire the corrugation information of each of the special image feature label, the primary image feature label and the secondary image feature label according to the surface morphology information; The power spectrum density function is used to quantitatively describe the ripple information, and the combination sequence of low-frequency, medium-low-frequency, medium-frequency and high-frequency inkjet signals on the surface of the printed product is determined according to the description results. determining surface edge features of each of the low-frequency, medium-low-frequency, medium-frequency, and high-frequency inkjet signals based on the combined sequence; The regional texture characteristics of the printed product surface are registered according to the edge characteristics, and the surface characteristics of the printed product are determined according to the registration results and the surface edge characteristics of the low-frequency, medium-low-frequency, medium-frequency and high-frequency inkjet signals.

[0083] In this embodiment, the printing characteristics of the printed product refer to the visual characteristics presented by the printed product during the printing process, such as: text readability, image quality, layout design, and printing accuracy.

[0084] In this embodiment, the printing texture feature refers to the texture state presented during the printing process, including the visual texture, tactile feel and color of the printed product.

[0085] In this embodiment, the roughness data of the printed product refers to the roughness of the surface of the printed product, and the distribution characteristics of the roughness data include: regionality and randomness.

[0086] In this embodiment, the precision data of the printed product refers to the fineness of printing, the accuracy of size, and the consistency of color, and the distribution characteristics of the precision data include: consistency and accuracy.

[0087] In this embodiment, the quantitative description of the surface protruding texture of the substrate includes: texture type, texture density, texture gap, and texture smoothness.

[0088] In this embodiment, the special image feature label is a simple representation of the pixel value, such as brightness, color value, etc.

[0089] In this embodiment, the primary image feature label usually involves the description of the local area of ​​the image, such as edge, texture, etc.

[0090] In this embodiment, the secondary image feature labels generally involve the understanding of the global structure of the image or the appearance of the object. These features may include the shape, posture, and color of the printed product.

[0091] In this embodiment, the surface morphology information refers to the microstructure and morphology characteristics of the surface of the substrate.

[0092] In this embodiment, the corrugated road information refers to information about a corrugated pattern or texture on the surface of an object.

[0093] In this embodiment, quantitative spectrum description of the ripple information refers to quantitative description of each frequency component in the ripple information using a power spectrum density function, which can reveal the energy distribution characteristics of the ripple information, such as in which frequency range the energy is concentrated and which frequency components have greater energy.

[0094] In this embodiment, the combined sequence of low-frequency, medium-low-frequency, medium-frequency and high-frequency inkjet signals on the surface of the substrate refers to a composite sequence obtained by superimposing inkjet signals of different frequencies on the surface of the substrate during the printing process. The composite sequence reflects the inkjet signals received on the surface of the substrate in different frequency bands. The low-frequency and medium-low-frequency inkjet signals mainly carry larger area information of the surface of the substrate, while the high-frequency inkjet signals provide smaller texture and detail information.

[0095] In this embodiment, the surface edge characteristics of the low-frequency, medium-low-frequency, medium-frequency and high-frequency inkjet signals refer to the application of different frequency inkjet signals to the texture and edge characteristics of different areas on the surface of the printed product during the printing process, including: Low-frequency inkjet signal: used to cover the darker areas on the surface of the substrate, which can form obvious black shadows, increase the sense of layering and three-dimensionality, and is suitable for the edges of the substrate and the parts with larger bumps, such as metal materials, stone, etc.

[0096] Medium and low frequency inkjet signals: used to cover the general area of ​​the surface of the substrate, can form a medium concentration of color transition, and are used for the surfaces of most non-metallic materials, such as paper, plastic, etc.

[0097] Medium frequency inkjet signal: used to adjust the brightness of the color on the surface of the printed product to achieve the best visual effect. It is used in areas with lighter texture or little color change on the surface of the printed product, such as textiles, leather, etc.

[0098] High-frequency inkjet signal: used to cover the fine texture and highlight areas on the surface of the printed product. It can produce rich color levels and subtle edge details. It is used for the surface of printed products with special effects such as wood grain and Stone Look.

[0099] In this embodiment, the registration of regional texture characteristics refers to finding the geometric transformation relationship between the printed product images by matching and identifying the texture features in the images.

[0100] The beneficial effects of the above technical solution are: the regional texture characteristics of the surface of the substrate are matched according to the edge characteristics, and the surface characteristics of the substrate are determined according to the matching results and the surface edge characteristics of the low-frequency, medium-low-frequency, medium-frequency and high-frequency inkjet signals. The texture characteristics of the surface of the substrate can be accurately described, and the substrate can be classified and identified according to these characteristics, making the analysis more accurate and comprehensive, which helps to improve printing efficiency.

[0101] Embodiment 7: Based on Example 6, the embodiment of the present invention determines the surface characteristics of the substrate according to the printing task of the substrate, including: Obtaining the material and type of the substrate, determining the physical and chemical properties of the substrate according to the material and type, and determining the printability of the substrate according to the chemical properties; Acquire the surface image of the substrate and automatically process the surface image based on imaging software and algorithms; Obtaining the surface morphology of the substrate based on the printability of the substrate according to the processing result; The specific treatment and surface properties required for the printing material are determined based on the surface morphology on the basis of the printing task of the printing material.

[0102] In this embodiment, the printing substrate material generally refers to various raw materials used for printing images, texts or other patterns, including: paper, textiles, plastic films, and non-woven fabrics.

[0103] In this embodiment, the physical and chemical properties of the printed product include: density, hardness, flexibility, hygroscopicity, and thermal conductivity.

[0104] In this embodiment, the printability of the substrate refers to its suitability for the printing process.

[0105] In this embodiment, the surface image of the printed product refers to the information of pattern, color and texture presented on the surface of the printed object.

[0106] In this embodiment, the surface morphology of the printed product refers to the characteristics of the outer contour, shape, structure, etc. of the printed object.

[0107] In this embodiment, the special treatment required for the substrate refers to a specific physical or chemical treatment of the substrate to change its properties, improve its performance or enhance its function, such as heat treatment, coating, deposition, and chemical reaction.

[0108] In this embodiment, the surface characteristics of the printing object refer to various physical, chemical and biological properties of the surface of the printing object, such as smoothness, texture and porosity.

[0109] The beneficial effects of the above technical solution are: performing image processing on the surface image of the substrate according to the imaging software can improve the image quality of the substrate, improve the clarity of the image, and obtain the surface morphology of the substrate in combination with the printability of the substrate, thereby determining the surface characteristics of the substrate, which can effectively improve the printing performance of the substrate, avoid problems such as poor printing and color distortion, and improve the printing quality and the aesthetics of the finished product.

[0110] Embodiment 8: Based on Example 7, the embodiment of the present invention further includes: By considering the influence of relevant parameter interference factors in the printing process of substrates, a dynamic torque balance equation is constructed to express the relationship between tension and speed: ;in, represents the translational inertia of the printing press, represents the angular translation speed of the printing press, represents the damping coefficient, The radial moment of the printed product, Radius of substrate; In the actual printing process, if the substrate is a hollow cylinder, the influence of substrate thickness and substrate length on the speed is obtained, including: ;in, Indicates the effect of substrate thickness and substrate length on printing time. Indicates the thickness of the printed product. Indicates the length of the printed product. Indicates the effect of substrate thickness and substrate length on the radius, Indicates the linear translation speed of the printing press.

[0111] The beneficial effects of the above technical solution are: by influencing the interference factors of relevant parameters in the printing process of the substrate, a dynamic torque balance equation is constructed, which can control the speed of the substrate to ensure the stability and consistency of the printing process. At the same time, the parameters and settings of the printing machine can be adjusted to adapt to different materials and printing conditions, and to optimize printing quality and printing efficiency.

[0112] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0113] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for adjusting tension for screen printing, characterized in that: include: Step 1: Obtain relevant parameters in the screen printing process, and determine the influencing factors of the tension in the screen printing process according to the relevant parameters; Step 2: Obtain the type and structure of the printing press, and determine a corresponding tension measuring instrument according to the type and structure; Step 3: monitoring the stretching state and position change of the screen in real time according to the tension measuring instrument, and determining abnormal tension based on influencing factors according to the stretching state and position change; Step 4: Determine abnormal parameters of the printing press according to the abnormal tension, and adjust the tension of screen printing according to the abnormal parameters based on the printing task of the substrate and the type of ink.

2. The tension adjustment method for screen printing according to claim 1, characterized in that: Obtain relevant parameters in the screen printing process, and determine the factors affecting the tension in the screen printing process according to the relevant parameters, including: Acquire the working principle of screen printing, and determine the printing data in the printing process according to the working principle; Acquire the data type of the printing data, and acquire the corresponding monitoring device according to the data type; Acquiring relevant parameters in the screen printing process according to the monitoring device; Adjust the relevant parameters to obtain the influence of the change of a single parameter on the tension during the printing process; The influence degree and manner of each parameter are determined according to the influence, and the influence factors of tension in the screen printing process are determined according to the influence degree and manner.

3. The tension adjustment method for screen printing according to claim 1, characterized in that: Obtaining the type and structure of the printing press, and determining the corresponding tension measuring instrument according to the type and structure, including: Acquire the working environment and materials used by the printing press, and determine the type and structure of the printing press according to the working environment and materials used; Determining the tension range and operating speed of the printing press according to the type and structure of the printing press; The corresponding tension measuring instrument is determined according to the tension range and working speed of the printing press based on the characteristics of the printed material and the process requirements.

4. The method for adjusting the tension of screen printing according to claim 1, characterized in that: The tension measuring instrument monitors the tension state and position change of the screen in real time, and determines the abnormal tension based on the tension state and position change and the influencing factors, including: The stress and strain changes of the wire mesh during the stretching process are monitored in real time according to the tension measuring instrument; determining the stretching state and position change of the wire mesh according to the stress and strain changes; Constructing a mathematical model of the wire mesh tension variation law based on the stretching state and position variation and the influencing factors; Determine the difference between the real-time state and position change of the screen and the normal working state and position change according to the mathematical model of the screen tension change law; Whether the tension is abnormal is determined based on the difference, a set threshold and the fit of the model.

5. The tension adjustment method for screen printing according to claim 1, characterized in that: Determining abnormal parameters of the printing press according to the abnormal tension, and adjusting the tension of screen printing based on the printing task and the type of ink of the printed product according to the abnormal parameters, including: Obtaining a sample with abnormal tension and determining the extent and nature of the problem caused by the abnormal tension based on the sample; Determine the cause of the problem according to the scope and nature of the problem, and determine the abnormal parameters of the printing press according to the cause of the problem; Determine the surface characteristics of the substrate according to the printing task of the substrate; Determine the ink characteristics and how it is deposited on the screen based on the ink type; The tension of screen printing is adjusted according to the abnormal parameters based on the surface characteristics of the substrate, the ink characteristics and the way of deposition on the screen.

6. The tension adjustment method for screen printing according to claim 5, characterized in that: Determine the surface characteristics of the printed product according to the printing task of the printed product, including: Determine the printing characteristics of the substrate according to the printing task, and determine the printing texture characteristics according to the printing characteristics; Determine the roughness data distribution characteristics and the precision data distribution characteristics of the printed product according to the printing texture characteristics; Determine the quantitative description of the surface protruding texture of the substrate according to the roughness data distribution characteristics and the precision data distribution characteristics of the substrate; Determining a special image feature label, a primary image feature label, and a secondary image feature label based on the salient texture quantitative description; Respectively obtaining surface morphology information of the special image feature label, the primary image feature label, and the secondary image feature label; Acquire the corrugation information of each of the special image feature label, the primary image feature label and the secondary image feature label according to the surface morphology information; The power spectrum density function is used to quantitatively describe the ripple information, and the combination sequence of low-frequency, medium-low-frequency, medium-frequency and high-frequency inkjet signals on the surface of the printed product is determined according to the description results. determining surface edge features of each of the low-frequency, medium-low-frequency, medium-frequency, and high-frequency inkjet signals based on the combined sequence; The regional texture characteristics of the printed product surface are registered according to the edge characteristics, and the surface characteristics of the printed product are determined according to the registration results and the surface edge characteristics of the low-frequency, medium-low-frequency, medium-frequency and high-frequency inkjet signals.

7. The tension adjustment method for screen printing according to claim 1, characterized in that: Determine the surface characteristics of the printed product according to the printing task of the printed product, including: Obtaining the material and type of the substrate, determining the physical and chemical properties of the substrate according to the material and type, and determining the printability of the substrate according to the chemical properties; Acquire the surface image of the substrate and automatically process the surface image based on imaging software and algorithms; Obtaining the surface morphology of the substrate based on the printability of the substrate according to the processing result; The specific treatment and surface properties required for the printing material are determined based on the surface morphology on the basis of the printing task of the printing material.

8. The method for adjusting the tension of screen printing according to claim 1, characterized in that: Also includes: By considering the influence of relevant parameter interference factors in the printing process of substrates, a dynamic torque balance equation is constructed to express the relationship between tension and speed: ;in, represents the translational inertia of the printing press, represents the angular translation speed of the printing press, represents the damping coefficient, Indicates the radial moment of the printed product. Indicates the radius of the substrate; In the actual printing process, if the substrate is a hollow cylinder, the influence of substrate thickness and substrate length on the speed is obtained, including: ;in, Indicates the effect of substrate thickness and substrate length on printing time. Indicates the thickness of the printed product. Indicates the length of the printed product. Indicates the effect of substrate thickness and substrate length on the radius, Indicates the linear translation speed of the printing press.

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