A kind of secondary overprint self-adapting interval coating method, device, coating machine
By detecting printing position deviations using color mark groups and adjusting the phase and speed of the gravure rollers, the problem of accumulated printing position errors in secondary overprinting of lithium batteries was solved, achieving a high-precision secondary overprinting effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- KATOP AUTOMATION CO LTD
- Filing Date
- 2024-03-04
- Publication Date
- 2026-07-10
AI Technical Summary
During the secondary overprinting process of lithium batteries, the slippage between the gravure roller and the substrate leads to the accumulation of printing position errors, resulting in inconsistencies between the film length and the total gap length, which affects the accuracy of the secondary overprinting.
The printing position deviation is detected by color mark group, the phase adjustment of gravure roller is calculated, and the speed is corrected according to the adjusted position to form a closed loop adjustment to improve printing accuracy.
It achieves high-precision printing in the secondary overprinting process. Through real-time detection and speed adjustment, it reduces printing position errors and improves the accuracy of overprinting.
Smart Images
Figure CN118082393B_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of lithium battery processing, and in particular to a method, apparatus, and coating machine for adaptive intercoating with secondary overprinting. Background Technology
[0002] In gravure printing for lithium batteries, there is a coating process called inter-coating, such as... Figure 1 As shown, the printing area is pre-carved on the gravure roller according to the product specifications. During the coating process, the excess paste is scraped off by pressing the gravure roller with a doctor blade. Because the printing area is recessed, the paste is not scraped off. The substrate is pressed onto the gravure roller by the coating roller, so that the paste in the printing area is transferred to the substrate. The non-printing area is cleaned by the doctor blade, so the printed product has a gap shape.
[0003] like Figure 2 As shown, the printed area 501 is usually referred to as the film length, and the non-printed area 502 is usually referred to as the gap. Secondary overprinting is a printing process in which a second coating is applied to the gap 502 after the material has undergone intercalation. For example... Figure 2 The white portion 503 is a secondary overprint of white ceramic paste, meaning it is printed again in the gap 502 between the intercoating materials. Precisely printing the white ceramic paste into the gap 502 between the intercoating materials is called overprinting, and the circumference of the gravure rollers used for the two printings must be exactly the same; otherwise, overprinting is impossible.
[0004] However, due to the unavoidable slippage between the gravure roller and the substrate during intercoating printing, the total length of the printed film plus the gap is sometimes slightly less than the circumference of the printing roller (commonly known as being too short). For example, if the gravure roller circumference is 1000mm, the film length is 800mm, and the gap is 200mm, after intercoating printing, the film length becomes 799.5mm, the gap is 200mm, and the total circumference is 999.5mm. As the error accumulates, the printing position of the secondary overprinted ceramic paste will also keep changing. Summary of the Invention
[0005] To address the shortcomings of existing technologies, embodiments of this application provide a method, apparatus, and coating machine for adaptive intercoating in secondary overprinting, which improves the accuracy of intercoating during secondary overprinting.
[0006] The technical solution adopted by this application to solve its technical problem is: a secondary overprinting adaptive intercoating method applied to a coating machine. The method includes: using a color mark group to detect the printing position during the secondary overprinting process, calculating the position deviation based on the printing position and the target position; adjusting the phase of the gravure roller based on the position deviation, and detecting the new printing position based on the gravure roller after phase adjustment; measuring the actual intercoating value based on the new printing position, comparing the actual intercoating value with the process setting value to obtain the secondary overprinting result; the secondary overprinting result is used to indicate whether the printing position is ahead or behind; and adjusting the speed of the gravure roller based on the secondary overprinting result to complete the secondary overprinting.
[0007] The above technical solution describes using a color mark group to detect the printing position during the secondary overprinting process and calculating the position deviation based on the printing position and the target position. This includes: using color mark 1 to measure the tail position of the first coating and using color mark 2 to measure the head position of the second coating; and calculating the position deviation based on the tail position of the first coating and the head position of the second coating.
[0008] The phase adjustment of the gravure roller based on the positional deviation described in the above technical solution includes: according to the formula The phase deviation of the gravure roller is calculated; where Z is the position deviation, D is the diameter of the gravure roller, and Y is the phase deviation of the gravure roller; the phase of the gravure roller is adjusted according to the phase deviation, and a new printing position is detected based on the gravure roller after phase adjustment.
[0009] The above technical solution describes measuring the actual value of the intercoating layer based on the new printing position, comparing the actual value of the intercoating layer with the process setting value, and obtaining the secondary overprinting result, including: if the actual value of the intercoating layer is less than the process setting value, the secondary overprinting result indicates that the printing position is ahead; if the actual value of the intercoating layer is greater than the process setting value, the secondary overprinting result indicates that the printing position is behind.
[0010] The above technical solution describes adjusting the gravure roller speed based on the secondary overprinting result, which includes: incrementing the advance count buffer X by 1 and clearing the lag count buffer Y by 1 based on the secondary overprinting result indicating that the printing position is ahead; clearing the advance count buffer X and incrementing the lag count buffer Y by 1 based on the secondary overprinting result indicating that the printing position is behind; and adjusting the gravure roller speed until either the advance count buffer X or the lag count buffer Y reaches a set count value.
[0011] The adjustment of the gravure roller speed described in the above technical solution includes: adjusting the gravure roller speed according to the formula V'=V*(C+(E*0.05)) / C; where V' is the adjusted speed of the gravure roller, V is the initial speed of the gravure roller, C is the circumference of the gravure roller, and E is the difference between the position deviation and the process setting value; based on the secondary overprinting result indicating that the printing position is ahead, controlling the gravure roller to decelerate to V'; based on the secondary overprinting result indicating that the printing position is behind, controlling the gravure roller to accelerate to V'.
[0012] The technical solution adopted by this application to solve its technical problem is: a secondary overprinting adaptive intercoating device, comprising: a deviation calculation module, used to detect the printing position in the secondary overprinting process using a color mark group, and calculate the position deviation based on the printing position and the target position; a phase adjustment module, used to adjust the phase of the gravure roller according to the position deviation, and detect the new printing position based on the gravure roller after phase adjustment; a result judgment module, used to measure the actual value of intercoating based on the new printing position, compare the actual value of intercoating with the process setting value, and obtain the secondary overprinting result; the secondary overprinting result is used to indicate whether the printing position is ahead or behind; and a speed adjustment module, used to adjust the speed of the gravure roller according to the secondary overprinting result to complete the secondary overprinting.
[0013] The technical solution adopted by this application to solve its technical problem is: a coating machine, including the secondary overprint adaptive intercoating device as described above.
[0014] The beneficial effects of this application are: by detecting the size of the secondary overprint in real time through the color mark group, it can determine whether the printing position of the gravure roller relative to the substrate is ahead or behind, and adjust the speed of the gravure roller in real time to match the material feeding speed, forming a closed-loop adjustment, thereby improving the accuracy of the intercoating in the secondary overprint. Attached Figure Description
[0015] Figure 1 This is a structural diagram of a coating machine with a two-stage overprinting process.
[0016] Figure 2 This is a schematic diagram of a two-stage overprinting process;
[0017] Figure 3 This invention provides a method for adaptive intercoating in secondary overprinting;
[0018] Figure 4 This invention provides a secondary overprinting intercoating effect diagram;
[0019] Figure 5 This invention provides a structural block diagram of a secondary overprinting adaptive intercoating device. Detailed Implementation
[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0021] The following will clearly and completely describe the concept, specific structure, and technical effects of the present invention in conjunction with embodiments and accompanying drawings, so as to fully understand the purpose, features, and effects of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. Other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are all within the scope of protection of the present invention. Furthermore, all connections / linkages involved in the patent do not simply refer to direct contact between components, but rather to the ability to form a better connection structure by adding or reducing connecting accessories according to specific implementation conditions. The various technical features in this invention can be combined interactively without contradicting each other.
[0022] As mentioned earlier, in the existing technical solution, when printing inter-coating on the substrate, there is an unavoidable slippage between the gravure roller and the substrate, which sometimes results in the total length of the printed film plus the gap being slightly less than the circumference of the printing roller (commonly known as the size being too short). As the error continues to accumulate, the printing position of the secondary overprinted ceramic paste will also keep changing.
[0023] Therefore, this application provides a secondary overprinting adaptive intercoating method, such as... Figure 3 As shown, the method includes:
[0024] S1. Use color mark groups to detect the printing position during the secondary overprinting process, and calculate the position deviation based on the printing position and the target position.
[0025] like Figure 1 In the indicated belt conveyor direction, the coating machine lowers the height of the adhesive roller 1, thereby pressing the substrate 2 tightly against the inter-coating gravure roller 3. The doctor blade 4 presses the inter-coating gravure roller 3 to scrape away excess paste. Due to the recessed area, the paste in the printing area is not scraped off. The adhesive roller 1 presses the substrate onto the inter-coating gravure roller 3, thus transferring the paste from the printing area to the substrate. The non-printing areas are cleaned by the doctor blade, resulting in a gapped appearance in the printed product. A secondary overprinting gravure roller 5 then performs secondary overprinting within these gaps. Figure 4 As shown in the figure, the product after secondary overprinting is as shown in the figure.
[0026] Specifically, color mark 1 is used to measure the position of the tail end of the first coating, and color mark 2 is used to measure the position of the head end of the second coating. For example, Figure 4As shown, the first coating is the black portion printed by the inter-coating gravure roller 3, and the second coating is the white portion printed by the secondary overprinting gravure roller 4. Color mark 1 outputs a high level when it detects black and stops outputting the high level when it leaves the black area; color mark 2 outputs a high level when it detects white and stops outputting the high level when it leaves the white area. Using a motion controller, the position of the tail edge of the current black coating is measured as X based on the falling edge signal of the high level of color mark 1, and the position of the head of the current white coating is measured as Y based on the rising edge signal of the high level of color mark 2. The distance difference between the black tail and the white head is Z = ABS(XY). ABS is a function for calculating the absolute value of the distance.
[0027] Assuming the distance between the black tail and the white head is set to D, the deviation value E = ZD; if E = 0, it means the printing position is correct; if E > 0, it means the white coating printing position is lagging; if E < 0, it means the white coating printing is ahead.
[0028] S2. Adjust the phase of the gravure roller according to the position deviation, and detect the new printing position based on the gravure roller after phase adjustment.
[0029] According to the formula The phase deviation of the gravure roller is calculated; where E is the position deviation, D is the diameter of the gravure roller, and P is the phase deviation of the gravure roller.
[0030] In an exemplary embodiment, if the second coating printing position is ahead, the phase of the gravure roller needs to be reduced by P°; if the second coating printing position is behind, the phase of the gravure roller needs to be increased by P°. For example, if the current gravure roller running speed is 100° / s, and the substrate is also running at the same linear speed, maintaining synchronization with the gravure roller speed, and the result obtained from the above detection indicates that the phase of the gravure roller needs to be advanced by 1°, then a command is used to trigger the gravure roller to run 101° in the next 1 second, and then return to 100° / s. In this way, the servo position of the gravure roller is adjusted by 1° relative to the position of the substrate. The new printing position is detected based on the gravure roller after the phase adjustment.
[0031] S3. Measure the actual value of the intercoating according to the new printing position, compare the actual value of the intercoating with the process setting value, and obtain the secondary overprinting result.
[0032] The secondary overprinting result is used to indicate whether the printing position is ahead or behind. Specifically, the actual value of the intercoating layer is measured based on the new printing position; if the actual value of the intercoating layer is less than the process setting value, the secondary overprinting result indicates that the printing position is ahead; if the actual value of the intercoating layer is greater than the process setting value, the secondary overprinting result indicates that the printing position is behind.
[0033] S4. Adjust the speed of the gravure roller according to the secondary overprinting result to complete the secondary overprinting.
[0034] Specifically, based on the secondary overprinting result indicating that the printing position is ahead, the advance count buffer X is incremented by 1, and the lag count buffer Y is cleared to zero; based on the secondary overprinting result indicating that the printing position is behind, the advance count buffer X is cleared to zero, and the lag count buffer Y is incremented by 1; until the advance count buffer X or the lag count buffer Y reaches the set count value, the speed of the gravure roller is adjusted.
[0035] In an exemplary embodiment, taking a set count value of 3 as an example, when the advance counting buffer X or the lag counting buffer Y is greater than or equal to 3, the speed of the gravure roller is adjusted according to the formula V' = V*(C+(E*0.05)) / C. Wherein, V' is the adjusted speed of the gravure roller, V is the set initial speed of the gravure roller, C is the circumference of the gravure roller, and E is the position deviation value.
[0036] Based on the secondary overprinting result indicating that the printing position is ahead, the gravure roller is controlled to decelerate to V'; based on the secondary overprinting result indicating that the printing position is behind, the gravure roller is controlled to accelerate to V'.
[0037] Through the above steps, this application uses color mark group to detect the size of secondary overprinting in real time, determines whether the printing position of the gravure roller relative to the substrate is ahead or behind, and corrects the speed of the gravure roller in real time to match the material feeding speed, forming a closed-loop adjustment to improve the accuracy of intercoating in secondary overprinting.
[0038] In one possible implementation, this application also provides a secondary overprint adaptive intercoating apparatus, which can be used to execute the secondary overprint adaptive intercoating method involved in this application. For details not disclosed in the apparatus embodiments of this application, please refer to the method embodiments of the secondary overprint adaptive intercoating method involved in this application.
[0039] like Figure 5 As shown, the secondary overprint adaptive intercoating device 400 includes: a deviation calculation module 410, a phase adjustment module 420, a result judgment module 430, and a speed adjustment module 440.
[0040] The deviation calculation module 410 is used to detect the printing position during the secondary overprinting process using the color mark group, and calculate the position deviation based on the printing position and the target position.
[0041] The phase adjustment module 420 is used to adjust the phase of the gravure roller according to the position deviation, and to detect the new printing position based on the gravure roller after phase adjustment.
[0042] The result judgment module 430 is used to measure the actual value of the intercoating according to the new printing position, compare the actual value of the intercoating with the process setting value, and obtain the secondary overprinting result; the secondary overprinting result is used to indicate whether the printing position is ahead or behind.
[0043] The speed adjustment module 440 is used to adjust the speed of the gravure roller according to the secondary overprinting result to complete the secondary overprinting.
[0044] Based on the above-described secondary overprint adaptive inter-coating device, the present invention also provides a coating machine, including the secondary overprint adaptive inter-coating device described above.
[0045] The above is a detailed description of the preferred embodiments of the present invention. However, the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention. All such equivalent modifications or substitutions are included within the scope defined by the claims of this application.
Claims
1. A two-stage overprinting adaptive inter-coating method, applied to a coating machine, characterized in that, The method includes: The printing position during the secondary overprinting process is detected using a color mark group, and the positional deviation is calculated based on the printing position and the target position. The phase of the gravure roller is adjusted according to the position deviation, and the new printing position is detected based on the gravure roller after phase adjustment. The actual value of the inter-coating is measured based on the new printing position, and the actual value of the inter-coating is compared with the process setting value to obtain the secondary overprinting result; the secondary overprinting result is used to indicate whether the printing position is ahead or behind. The speed of the gravure roller is adjusted according to the secondary overprinting result to complete the secondary overprinting; wherein, adjusting the speed of the gravure roller according to the secondary overprinting result includes: Based on the secondary overprint result, the printing position is ahead of the target position. The ahead count buffer X is incremented by 1, and the lag count buffer Y is cleared to zero. Based on the secondary overprinting result indicating a printing position lag, the lead count buffer X is cleared to zero, and the lag count buffer Y is incremented by 1. The gravure roller speed is adjusted until either the lead count buffer X or the lag count buffer Y reaches a set count value; specifically, adjusting the gravure roller speed includes: The speed of the gravure roller is adjusted according to the formula V'=V*(C+(E*0.05)) / C; where V' is the adjusted speed of the gravure roller, V is the initial speed of the gravure roller, C is the circumference of the gravure roller, and E is the position deviation value. Based on the secondary overprinting result indicating that the printing position is ahead, the gravure roller is controlled to decelerate to V'. Based on the secondary overprinting result indicating a printing position lag, the gravure roller is controlled to accelerate to V'.
2. The adaptive intercoating method for secondary overprinting according to claim 1, characterized in that, The method of using color mark groups to detect the printing position during the secondary overprinting process and calculating the position deviation based on the printing position and the target position includes: Use color mark 1 to measure the position of the tail of the first coating, and use color mark 2 to measure the position of the head of the second coating; The positional deviation is calculated based on the position of the tail of the first coating and the position of the head of the second coating.
3. The adaptive intercoating method for secondary overprinting according to claim 1, characterized in that, The step of adjusting the phase of the gravure roller according to the positional deviation includes: According to the formula The phase deviation of the gravure roller is calculated; where Z is the position deviation, D is the diameter of the gravure roller, and Y is the phase deviation of the gravure roller. The phase of the gravure roller is adjusted according to the phase deviation, and a new printing position is detected based on the gravure roller after phase adjustment.
4. The adaptive intercoating method for secondary overprinting according to claim 1, characterized in that, The step of measuring the actual value of the intercoating layer based on the new printing position, comparing the actual value of the intercoating layer with the process setting value, and obtaining the secondary overprinting result includes: If the actual value of the intercoating layer is less than the process setting value, the secondary overprinting result indicates that the printing position is ahead; if the actual value of the intercoating layer is greater than the process setting value, the secondary overprinting result indicates that the printing position is behind.
5. A secondary overprinting adaptive intercoating apparatus, used to implement the secondary overprinting adaptive intercoating method according to any one of claims 1-4, characterized in that, include: The deviation calculation module is used to detect the printing position during the secondary overprinting process using the color mark group, and calculate the position deviation based on the printing position and the target position. The phase adjustment module is used to adjust the phase of the gravure roller according to the position deviation, and to detect the new printing position based on the gravure roller after phase adjustment. The result judgment module is used to measure the actual value of the intercoating according to the new printing position, compare the actual value of the intercoating with the process setting value, and obtain the secondary overprinting result; the secondary overprinting result is used to indicate whether the printing position is ahead or behind. The speed adjustment module is used to adjust the speed of the gravure roller according to the secondary overprinting result to complete the secondary overprinting.
6. A coating machine, characterized in that, Includes the adaptive intercoating device for secondary overprinting as described in claim 5.