A precision metering coating control method and apparatus for masking tape

Abstract

The present application relates to a kind of precision quantitative coating control method and device of masking tape, it is related to tape coating technology, it includes the product coating demand information of call product coating demand information;Based on product coating demand information, the redundant coating amount when coating roll is matched on masking tape is coated;According to the rotation speed of coating roll size matching coating roll, according to the rotation speed of coating roll control coating roll and rotate to coat on the surface of masking tape, and according to gap distance control scraper preliminary removal of the excess release agent on the surface of coating roll before coating;After coating, based on the redundant coating amount and product coating demand information, determine the excess glue removal amount, and real-time acquisition masking tape image information, combined with masking tape image information, the excess glue removal amount is verified to obtain verification result;According to the excess glue removal amount and verification result control glue roller to masking tape is secondary processed.The present application has the effect of quantitative coating to masking tape.

Description

Technical Field

[0001] This invention relates to the field of tape coating technology, and in particular to a method and apparatus for precise quantitative coating control of masking tape. Background Technology

[0002] Masking tape, a commonly used functional adhesive product, is widely used in various industries such as spray painting, baking paint coating, leather shoemaking, and electronics manufacturing. It is used to mask and protect specific areas during the processing to prevent the area from being contaminated by paint, impurities, etc.

[0003] In the industry, traditional blade coating and ordinary anilox roller coating processes are commonly used when applying release agents to masking tapes. The coating equipment is simple in structure, using only a single scraper and a coating roller with a fixed rotation speed to apply the release agent. The coating process lacks a precise quantitative control mechanism and real-time coating quality verification methods, resulting in uneven release agent coating and inaccurate control over the coating amount. Summary of the Invention

[0004] In order to achieve precise quantitative coating of masking tape and improve the accuracy of coating amount, this invention provides a method and apparatus for controlling the precise quantitative coating of masking tape.

[0005] In a first aspect, the present invention provides a method for precise quantitative coating control of masking tape, employing the following technical solution: A method for precise quantitative coating control of masking tape, comprising: Retrieve product coating requirements information; Based on the product coating demand information, the redundant coating amount when the coating roller coats on the masking tape is matched according to the preset coating roller. The coating roller rotation speed is matched according to the redundant coating amount, the preset immersion depth, and the preset coating roller size. The coating roller is rotated according to the rotation speed of the coating roller to coat the masking tape surface, and before coating, the preset scraper is controlled according to the preset gap distance to initially remove excess release agent from the surface of the coating roller. After coating, the excess adhesive removal amount is determined based on the redundant coating amount and product coating requirements. The masking tape image information is collected in real time, and the excess adhesive removal amount is verified by combining the masking tape image information to obtain the verification result. Based on the excess adhesive removal amount and the calibration results, the preset adhesive scraper roller is controlled to perform secondary processing on the masking tape.

[0006] By adopting the above technical solution, during the coating of masking tape, an extra redundant coating amount is set based on the product coating requirements to ensure more uniform coating. After coating according to the redundant coating amount, the excess release agent is scraped off by a scraper roller, avoiding the difficulty of replenishing adhesive due to insufficient initial coating amount. At the same time, the excess adhesive removal amount is verified by image recognition, and different verification results are classified and processed in the subsequent adhesive removal process, thereby ensuring quantitative coating of masking tape.

[0007] Optionally, the verification results include positive and negative results; methods for verifying excess adhesive removal include: The masking tape is illuminated with a preset lighting intensity; Image analysis of the masking tape image information is performed from the light-transmitting back of the masking tape using a preset cyclic scanning method to obtain color depth information at various locations on the masking tape. The masking tape is divided into scanning units with a preset scanning width along the conveying direction; When the color depth information at each position in the scanning unit is consistent with the preset reference color depth, the verification result is a positive result, the verification of excess adhesive removal is completed, and the verification result is output. When the color depth information at each position in the scanning unit is inconsistent with the reference color depth, the difference in color depth is identified based on the reference color depth; Based on the comparison between the differential color depth and the reference color depth, the verification result is determined to be either positive or negative, and the verification result is output.

[0008] By adopting the above technical solution, the masking tape is subjected to light treatment, and the color depth of the masking tape is identified from the backlight, thereby quickly determining whether the excess adhesive removal amount on the masking tape is qualified.

[0009] Optionally, when the verification result is positive, the method for the scraper roller to perform secondary processing on the masking tape includes: The preset pressure rollers are numbered along the conveying direction of the masking tape. The pressure roller on the input side of the coating roller is designated as the first pressure roller, the pressure roller on the output side of the coating roller is designated as the second pressure roller, the pressure roller on the output side of the first scraper roller is designated as the third pressure roller, and the pressure roller on the output side of the second scraper roller is designated as the fourth pressure roller. The first and second pressure rollers are located on both sides of the coating roller, the second and third pressure rollers are located on both sides of the first scraper roller, and the third and fourth pressure rollers are located on both sides of the second scraper roller. The excess adhesive removal amount is divided into a first-stage adhesive removal amount and a second-stage adhesive removal amount based on the preset fine processing allowance range; The second descent distance of the second pressing roller, the third descent distance of the third pressing roller, and the fourth descent distance of the fourth pressing roller are matched based on the first and second stages of adhesive removal. The rotation speed of the first scraper roller is matched with the amount of adhesive removed and the rotation speed of the coating roller. The rotation speed of the second scraper roller is set according to the rotation speed of the coating roller; The second pressing roller is controlled according to the second descent distance, the third pressing roller is controlled according to the third descent distance, the fourth pressing roller is controlled according to the fourth descent distance, the first scraper roller is controlled according to the rotation speed of the first scraper roller, and the second scraper roller is controlled according to the rotation speed of the second scraper roller.

[0010] By adopting the above technical solution, two adhesive removal processes are set up: rough removal and fine finishing. In the rough removal process, most of the excess release agent is removed and the masking tape is initially smoothed. In the fine finishing process, since the amount of adhesive removed is small, the masking tape can be finely treated to remove adhesive, thereby completing the quantitative coating of the masking tape.

[0011] Optionally, when the difference in color depth is less than the reference color depth, the verification result is negative; when the verification result is negative, the method for the scraper roller to perform secondary processing on the masking tape includes: Locate scanning units with varying color depths; The first and second pressure rollers are driven to descend synchronously by a preset increase in descent distance to increase the redundant coating amount; The scanning unit with different color depths is controlled to move to a preset processing position, and the coating roller is stopped for a preset pause time. During the pause time, the preset dispensing roller is controlled to move along the masking tape to the scanning unit with different color depths. The moving direction is from the coating roller to the first scraper roller, so as to roll the release agent in the scanning unit with a large amount of redundant coating to the scanning unit with different color depths. After the glue separation is completed, control the first pressing roller, the second pressing roller, and the glue separation roller to reset.

[0012] By adopting the above technical solution, when image recognition determines that there is a relative material shortage on the surface of the masking tape, the masking tape is fed with material by the coating roller, and a special dispensing roller is used to move the release agent from the material feeding point of the masking tape to the material shortage position, so that the release agent on the surface of the masking tape is evenly distributed.

[0013] Optionally, the method of applying the masking tape to the surface using a coating roller includes: The extrusion ratio is determined based on the redundant coating amount and the preset cell capacity. The gas distribution volume of a single mesh cavity is matched according to the extrusion ratio; The total air volume is determined based on the air volume per cell and the preset cell information of the coating roller. As the coating roller rotates, air is supplied according to the total air volume and the preset air temperature to extrude the release agent in the cavities on the surface of the coating roller onto the surface of the masking tape.

[0014] By adopting the above technical solution, an air hole and a mesh structure are set on the coating roller. The mesh can contain the release agent, and the air blown out of the air hole can help blow out the release agent in the mesh, so that the release agent adsorbed on the coating roller can be quantitatively adsorbed onto the masking tape.

[0015] Secondly, this application provides a precision quantitative coating device for masking tape, which adopts the following technical solution: A precision quantitative coating apparatus for masking tape is controlled by a precision quantitative coating control method for masking tape. It includes a plurality of guide rollers for guiding the conveying of masking tape, a coating roller for coating the masking tape, a scraper roller for scraping off excess coating on the surface of the masking tape, and a pressing roller for pressing the masking tape against the coating roller and the scraper roller.

[0016] Optionally, it also includes a drive base for driving the coating roller and the scraper roller to rotate; a lifting adjustment mechanism for adjusting the pressing force of the masking tape is provided between the pressing roller and the drive base. The lifting and adjusting mechanism includes a sliding seat slidably mounted on the drive base, a lifting cylinder that drives the sliding seat to rise and fall, and a fine-tuning threaded rod vertically rotatably mounted on the sliding seat; the end of the pressure roller is threadedly connected to the fine-tuning threaded rod.

[0017] Optionally, the drive base is provided with a coating tank for storing release agent and a collection tank for collecting dripping release agent; the lower end of the coating roller extends into the coating tank and is immersed in the release agent; the collection tank is connected to an external recycling bin for recycling and reuse of the release agent.

[0018] Optionally, the coating roller is provided with a scraper structure, the scraper structure including a scraper and a mounting bracket for mounting the scraper on the drive base; the edge of the scraper is close to the surface of the coating roller and has a gap between it and the surface of the coating roller for a quantitative release agent to pass through; the scraper is inclined toward the collection trough.

[0019] Optionally, the coating roller includes an inner roller body and an outer roller body that rotates relative to the inner roller body; the outer roller body has an array of cavities on its surface for release agent to be adsorbed into; the inner roller body is connected to an external air source, and an air hole is opened at the top of the inner roller body, the air hole facing the masking tape; when the cavities are aligned with the air holes, the release agent in the cavities is blown to the surface of the masking tape for adsorption.

[0020] In summary, this application includes at least one of the following beneficial technical effects: When applying the masking tape, set an extra amount of redundant coating. After applying the masking tape according to the redundant amount, use a scraper roller to scrape off the excess release agent. This avoids the difficulty of replenishing the adhesive due to insufficient initial coating amount, and ensures that the masking tape is applied quantitatively. Two adhesive removal processes are set up: rough removal and fine finishing. In the rough removal process, most of the excess release agent is removed and the masking tape is initially smoothed. In the fine finishing process, the masking tape is finely treated to remove adhesive, thereby completing the quantitative coating of the masking tape. When there is a relative shortage of material on the surface of the masking tape, the masking tape is fed with material by the coating roller, and a special dispensing roller is used to move the release agent from the feeding point of the masking tape to the shortage point, so that the release agent is evenly distributed on the surface of the masking tape. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the overall structure of a precision quantitative coating device for masking tape according to an embodiment of the present invention; Figure 2 This is a cross-sectional view of a precision quantitative coating device for masking tape according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the lifting and adjusting mechanism according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the scraper structure according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the cell structure of the coating roller according to an embodiment of the present invention.

[0022] The parts referred to by the numbers in the above attached figures are as follows: 1. Drive base; 2. Guide roller; 3. Coating roller; 31. Inner roller body; 32. Outer roller body; 33. Air cavity; 34. Air hole; 35. Cavity; 4. Scraper roller; 4a. First scraper roller; 4b. Second scraper roller; 5. Pressure roller; 5a. First pressure roller; 5b. Second pressure roller; 5c. Third pressure roller; 5d. Fourth pressure roller; 6. Lifting and adjusting mechanism; 61. Sliding seat; 62. Lifting cylinder; 63. Fine-tuning threaded rod; 7. Coating tank; 8. Collection tank; 9. Scraper structure; 91. Scraper; 92. Mounting frame. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0024] This application discloses a precision quantitative coating device for masking tape.

[0025] Reference Figure 1 The precision quantitative coating device for masking tape includes a drive base 1, a guide roller 2, a coating roller 3, a scraper roller 4, and a pressure roller 5. The drive base 1 is installed on the ground and houses electrical equipment such as a motor, power supply, and controller. The two ends of the drive base 1 are the input end and the output end, respectively. The masking tape enters the drive base 1 from the input end and exits from the output end.

[0026] Guide rollers 2 are rotatably mounted at both ends of the drive base 1, meaning that guide rollers 2 are present at both the input and output ends of the drive base 1. Guide rollers 2 do not have a power source and are passively rotating. Guide rollers 2 are used to guide the masking tape, guiding it into or out of the drive base 1. In this embodiment, there are three guide rollers 2 on each side of the drive base 1, and the masking tape passes through the guide rollers 2 in an S-shaped path.

[0027] The coating roller 3 is rotatably mounted on the drive base 1 and located at the rear end of the guide roller 2 at the input end. Its power source is inside the drive base 1, and it is driven to rotate by a motor inside the drive base 1. The top of the coating roller 3 abuts against the masking tape, thereby simultaneously applying the release agent to the surface of the masking tape while moving the masking tape.

[0028] Reference Figure 1 and Figure 2 The scraper roller 4 is used to scrape off excess paint (release agent) from the surface of the masking tape after it has been coated by the coating roller 3. The scraper roller 4 is located at the rear end of the coating roller 3, and its power source is located within the drive base 1, where it is driven by a motor. There are two scraper rollers 4, including a first scraper roller 4a and a second scraper roller 4b, arranged sequentially along the conveying direction of the masking tape. The first scraper roller 4a is used to coarsely remove excess release agent from the surface of the masking tape, while the second scraper roller 4b is used to finish the surface of the masking tape.

[0029] The pressure roller 5 is mounted on the drive base 1 via a lifting and adjusting mechanism 6. It is used to press the masking tape onto the coating roller 3 and the scraper roller 4 so that the coating roller 3 and the scraper roller 4 can fully exert their force on the masking tape. The pressure roller 5 includes, in sequence along the conveying direction of the masking tape, a first pressure roller 5a, a second pressure roller 5b, a third pressure roller 5c, and a fourth pressure roller 5d. The first pressure roller 5a is installed between the guide roller 2 and the coating roller 3 at the input end. The second pressure roller 5b is installed between the coating roller 3 and the first scraper roller 4a. There are two third pressure rollers 5c, both installed between the first scraper roller 4a and the second scraper roller 4b. The fourth pressure roller 5d is installed between the second scraper roller 4b and the guide roller 2 at the output end.

[0030] Reference Figure 1 and Figure 3 The lifting and adjusting mechanism 6 can adjust the installation height of the pressure roller 5 on the drive base 1, thereby changing the contact surface and contact force between the masking tape, the scraper roller 4, and the coating roller 3. The lifting and adjusting mechanism 6 includes a sliding seat 61, a lifting cylinder 62, and a fine-tuning threaded rod 63. The sliding seat 61 is slidably mounted on the side wall of the drive base 1 via a guide rail mounting structure. The lifting cylinder 62 is fixedly mounted on the drive base 1, and its output end is connected to the top of the sliding seat 61. The fine-tuning threaded rod 63 is vertically rotatably mounted on the sliding seat 61, and the fine-tuning threaded rod 63 has threads in its circumference. The end of the pressure roller 5 is threadedly connected to the fine-tuning threaded rod 63.

[0031] The cylinder can drive the pressing roller 5 to make coarse adjustments in the vertical direction, while the fine adjustment screw rod 63 can be rotated to make fine adjustments in the vertical direction.

[0032] Reference Figure 1 , Figure 2 and Figure 4 In this embodiment, the drive base 1 is provided with a coating tank 7 and a collection tank 8. The coating tank 7 is used to store the release agent, and the collection tank 8 is used to receive excess or dripping release agent. The coating tank 7 is located below the coating roller 3, and the lower end of the coating roller 3 extends into the coating tank 7 and is immersed in the release agent. The collection tank 8 is located below each scraper roller 4 and coating roller 3, and each collection tank 8 has a liquid outlet, which is connected to an external recycling bin for recycling and reuse of the release agent.

[0033] Reference Figure 1 , Figure 2 and Figure 4 Furthermore, a scraper structure 9 is provided on the coating roller 3. The scraper structure 9 is used to remove excess release agent from the surface of the coating roller 3, thereby ensuring that a fixed amount of release agent is applied to the masking tape. The scraper structure 9 includes a scraper 91 and a mounting frame 92. The mounting frame 92 is fixedly mounted on the drive base 1, and the scraper 91 is fixed to the mounting frame 92 by bolts. The edge of the scraper 91 is close to the surface of the coating roller 3, and there is a gap between the edge of the scraper 91 and the surface of the coating roller 3. This gap can limit the amount of release agent passing through.

[0034] In this embodiment, the scraper 91 is tilted towards the collection tank 8, so that the release agent removed by the scraper 91 can slide down the scraper 91 and flow into the collection tank 8 for recycling.

[0035] Reference Figure 2 and Figure 5In this embodiment, the coating roller 3 is an anilox roller structure, comprising an inner roller body 31 and an outer roller body 32. The inner roller body 31 is fixed to the drive base 1, and has a hollow interior with an air cavity 33. Air holes 34 are spaced apart along the axial direction on its top, pointing towards the masking tape. The inner roller body 31 is connected to an external air source, and air can escape from the air holes 34 when the external air source supplies air to the inner roller body 31. The outer roller body 32 is sleeved on the outside of the inner roller body 31 and is connected to a motor inside the drive base 1. The outer roller body 32 can rotate relative to the inner roller body 31 under the drive of the motor. An array of cells 35 are formed on the surface of the outer roller body 32, which can accommodate the release agent when the outer roller body 32 enters the release agent.

[0036] When the cells 35 containing the release agent rotate with the outer roller 32 to the top and come into contact with the masking tape, the release agent is adsorbed onto the masking tape, thereby coating the masking tape. During this process, the air vents 34 can further push the release agent out of the cells 35, allowing the release agent to be fully adsorbed onto the masking tape. By controlling the size of the air vents 34, the amount of release agent adsorbed onto the masking tape in the cells 35 can also be changed.

[0037] Based on the same inventive concept, embodiments of the present invention provide a method for precise quantitative coating control of masking tape.

[0038] A method for precise quantitative coating control of masking tape includes the following steps: Step S1: Retrieve product coating requirements information.

[0039] Product coating requirement information refers to the coating thickness required for masking tape. This information is recorded in the production system's database and can be retrieved from the database based on the actual products to be produced.

[0040] Step S2: Based on the product coating requirement information, match the preset redundant coating amount of the coating roller 3 when coating on the masking tape.

[0041] Redundant coating amount refers to the amount of release agent applied in advance to ensure uniformity. The redundant coating amount is the product of the product coating requirement information and a preset redundancy coefficient. The redundancy coefficient is a fixed coefficient preset by technicians, representing the proportion by which the redundant coating amount exceeds the product coating requirement information; it will not be elaborated upon here.

[0042] After retrieving the product coating requirement information, a fixed redundancy factor is multiplied by this information to obtain the redundancy coating amount. This redundancy coating amount is greater than the product coating requirement information to ensure that the release agent dosage of the masking tape is not too low during subsequent coating processes.

[0043] Step S3: Match the coating roller rotation speed according to the redundant coating amount, the preset immersion depth, and the preset coating roller size.

[0044] The immersion depth is the depth at which the lower end of the coating roller 3 is immersed in the release agent solution, as set by the technician.

[0045] The dimensions of the coating roller are the fixed dimensional parameters of coating roller 3, and here it is the shaft diameter value of coating roller 3.

[0046] The rotation speed of the coating roller is the same as the rotation speed of the coating roller 3 when it coats the masking tape.

[0047] In this embodiment, the immersion depth and the size of the coating roller determine the arc value of the coating roller 3 simultaneously immersed in the release agent solution, while the rotation speed of the coating roller determines the speed at which the cells 35 on the surface of the coating roller 3 move from being immersed in the release agent to leaving the release agent. The combination of these three factors determines the time that a single cell 35 remains in the release agent solution. Within the capacity of the cell 35, the longer the time, the more release agent enters the cell 35.

[0048] Therefore, there is a correlation between redundant coating amount, immersion depth, coating roller size, and coating roller rotation speed. The correlation between these four factors is stored in a pre-set database, which is obtained and stored in advance by technicians. By inputting the redundant coating amount, immersion depth, and coating roller size into this database, the coating roller rotation speed can be matched.

[0049] Step S4: Control the coating roller 3 to rotate according to the rotation speed of the coating roller to coat the masking tape surface, and control the preset scraper 91 to preliminarily remove excess release agent from the surface of the coating roller 3 according to the preset gap distance before coating.

[0050] The gap distance is the distance between the scraper 91 and the coating roller 3, which is set by technicians based on the actual coating test results of the coating roller 3.

[0051] The system sets the rotation speed of the coating roller 3 and controls the coating roller 3 to coat the masking tape. Due to various other factors, the actual amount of release agent rolled up by the coating roller 3 may be greater than the theoretical amount. Therefore, before the coating roller 3 coats, the scraper 91 is controlled to scrape off the excess release agent on the surface of the coating roller 3 at a fixed gap distance to achieve preliminary quantitative measurement.

[0052] Step S5: After coating, determine the excess adhesive removal amount based on the redundant coating amount and product coating requirements, and collect masking tape image information in real time. Combine the masking tape image information to verify the excess adhesive removal amount and obtain the verification result.

[0053] Excess release agent amount refers to the amount of excess release agent that needs to be scraped off after coating. Excess release agent amount is the difference between redundant coating amount and product coating requirements.

[0054] The masking tape image information consists of pictures of the masking tape after coating, taken by an industrial camera, used to determine the release dosage on the surface of the masking tape. The specific method for acquiring the masking tape image information will not be detailed here, but will be described in detail in subsequent embodiments.

[0055] In this embodiment, due to the influence of other factors, the coating thickness on the surface of the masking tape after application may differ from the theoretical redundant coating amount. Therefore, it needs to be verified, and different verification results will affect the subsequent processing of the masking tape by the system. The specific verification method is not described in detail here, but will be introduced in detail in subsequent embodiments.

[0056] Step S6: Based on the excess adhesive removal amount and the verification results, control the preset adhesive scraper roller 4 to perform secondary processing on the masking tape.

[0057] After coating is completed, the system performs secondary processing on the masking tape using different methods based on the excess adhesive removed and different calibration results. This process removes excess adhesive from the masking tape surface while simultaneously improving the uniformity of the release agent on the masking tape surface.

[0058] The method for verifying excess adhesive removal includes the following steps: In this embodiment, an illumination lamp is used above the masking tape, and an industrial camera is used below the masking tape to capture images of the light transmission. The excess adhesive removal amount is then analyzed to obtain verification results. Verification results include positive and negative results. A positive result indicates that the excess adhesive removal amount on the masking tape surface meets the requirements or is greater than the baseline normal amount. A negative result indicates that the excess adhesive removal amount on the masking tape surface does not meet the requirements.

[0059] Step S500: Irradiate the masking tape with a preset lighting intensity.

[0060] Illumination intensity refers to the light intensity when the lighting fixture illuminates the masking tape. The illumination intensity is set by technicians to ensure good light transmission and clear color contrast of the masking tape.

[0061] Step S501: Perform image analysis on the masking tape image information from the light-transmitting back of the masking tape using a preset cyclic scanning method to obtain color depth information at various locations on the masking tape.

[0062] The cyclic scanning method involves the industrial camera scanning horizontally along the width of the masking tape, and after scanning one layer, it continues to scan the next layer along the length.

[0063] Color depth information refers to the grayscale level of an image, which represents the amount of coating applied.

[0064] After the lighting lamp illuminates the masking tape, the industrial camera scans the masking tape layer by layer and analyzes the color depth in the masking tape image information.

[0065] Step S502: Divide the masking tape into scanning units with a preset scanning width along the conveying direction.

[0066] A scanning unit refers to a scanning area of ​​a specified width along the length of the masking tape. Within this scanning area, an industrial camera performs a single-area scan along the width of the masking tape. The scanning width refers to the width of a single scanning unit along the length of the masking tape, a parameter preset by the technician.

[0067] Step S503: When the color depth information at each position in the scanning unit is consistent with the preset reference color depth, the verification result is a positive result, the verification of excess adhesive removal is completed, and the verification result is output.

[0068] Reference color depth refers to the color depth at the location where the difference between the redundant coating amount and the product coating requirement information under lighting is the excess amount of adhesive removal. Reference color depth is a parameter obtained by technicians through prior testing.

[0069] The system analyzes the color depth information of the scanning unit from the masking tape image information. If the color depth information is consistent with the reference color depth, it means that the excess adhesive removal amount at each position of the scanning unit meets the requirements. At this time, the verification result is a positive result, and the verification of excess adhesive removal amount is completed.

[0070] Step S5040: When the color depth information at each position in the scanning unit is inconsistent with the reference color depth, the difference color depth is identified based on the reference color depth.

[0071] Differential color depth refers to the color feature in the scanning unit that differs from the reference color depth.

[0072] When the color depth information at various locations in the scanning unit is inconsistent with the reference color depth, the difference in color depth can be analyzed from the masking tape image information of the scanning unit based on the color of the reference color depth.

[0073] Step S5041: Determine whether the verification result is positive or negative based on the comparison relationship between the difference color depth and the reference color depth, and output the verification result.

[0074] The depth of the color difference determines the amount of excess adhesive removal. If the color difference depth is greater than the reference color depth, it means that the color at the location corresponding to the color difference depth is darker under transmitted light, and the amount of excess adhesive removal is greater than the normal reference value. In this case, a positive result will be output.

[0075] If the difference in color depth is not greater than the reference color depth, it means that the color depth at the corresponding position is too light or the same as the reference color depth. The excess amount of adhesive removed is not greater than the normal value. In this case, a negative result is output. The case that the color depth at the corresponding position is too light may be due to insufficient adhesive on the surface of the masking tape. When the verification result is positive, the method for secondary processing of the masking tape by the scraper roller 4 includes the following steps: Step S600: Number the preset pressure rollers 5 along the conveying direction of the masking tape. The pressure roller 5 on the input side of the coating roller 3 is designated as the first pressure roller 5a, the pressure roller 5 on the output side of the coating roller 3 is designated as the second pressure roller 5b, the pressure roller 5 on the output side of the preset first scraper roller 4a is designated as the third pressure roller 5c, and the pressure roller 5 on the output side of the preset second scraper roller 4b is designated as the fourth pressure roller 5d. The first pressure roller 5a and the second pressure roller 5b are located on opposite sides of the coating roller 3, the second pressure roller 5b and the third pressure roller 5c are located on opposite sides of the first scraper roller 4a, and the third pressure roller 5c and the fourth pressure roller 5d are located on opposite sides of the second scraper roller 4b.

[0076] Step S601: Divide the excess adhesive removal amount into a first-stage adhesive removal amount and a second-stage adhesive removal amount based on a preset fine processing allowance range.

[0077] In this embodiment, the process of scraping off excess release agent is divided into two steps. During the first scraping, most of the excess release agent is scraped off by the first scraper roller 4a, leaving only a small amount of release agent, which is a rough removal process. During the second scraping, the remaining excess release agent is scraped off by the second scraper roller 4b, and the surface of the masking tape is smoothed, which is a finishing process.

[0078] Here, the first stage of adhesive removal refers to the amount of release agent that needs to be scraped off during the roughing process, and the second stage of adhesive removal refers to the amount of release agent that needs to be scraped off during the finishing process. The sum of the first and second stage adhesive removal amounts is the excess adhesive removal amount. The finishing allowance range is the reasonable range within which the second stage adhesive removal amount is set by the technicians.

[0079] Step S602: Match the second descent distance of the second pressing roller 5b, the third descent distance of the third pressing roller 5c, and the fourth descent distance of the fourth pressing roller 5d based on the first and second stage adhesive removal amounts.

[0080] The ability of the scraper roller 4 to scrape the masking tape is determined by the degree of closeness between the scraper roller 4 and the masking tape. Furthermore, the degree of closeness is determined by the position of the pressure rollers 5 on both sides of the scraper roller 4. The lower the position of the pressure rollers 5, the more tightly they can press the masking tape against the scraper roller 4.

[0081] Therefore, after determining the amount of adhesive removed in the first stage and the amount of adhesive removed in the second stage, the pressing degree of the first scraper roller 4a and the second scraper roller 4b is matched according to the amount of release agent that needs to be scraped off in the two processes respectively. The pressing degree of the first scraper roller 4a is proportional to the amount of adhesive removed in the first stage, and the pressing degree of the second scraper roller 4b is proportional to the amount of adhesive removed in the second stage.

[0082] Meanwhile, the second descent distance of the second pressing roller 5b, the third descent distance of the third pressing roller 5c, and the fourth descent distance of the fourth pressing roller 5d are all proportional to the amount of adhesive removed in the first stage and the amount of adhesive removed in the second stage.

[0083] Step S603: Match the rotation speed of the first scraper roller with the amount of adhesive removed and the rotation speed of the coating roller.

[0084] The rotational speed of the first scraper roller refers to the rotational speed of the first scraper roller 4a itself.

[0085] The scraping ability of the scraper roller 4 on the masking tape is also related to the relative rotational speed between the two; the higher the relative rotational speed, the stronger the scraping ability. The relative rotational speed between the two rollers is first determined based on the amount of adhesive removed, and then the rotational speed of the first scraper roller is calculated in conjunction with the rotational speed of the coating roller. Here, the rotational speed of the coating roller is the moving speed of the masking tape.

[0086] Step S604: Set the rotation speed of the second scraper roller according to the rotation speed of the coating roller.

[0087] The rotational speed of the second scraper roller refers to the rotational speed of the second scraper roller 4b itself.

[0088] In contrast to step S603, since the scraping process of the second scraper roller 4b on the masking tape is a finishing process, the relative rotation speeds of the two are approximately the same. Therefore, the rotation speed of the second scraper roller is the same as the rotation speed of the coating roller.

[0089] Step S605: Control the second pressing roller 5b according to the second descent distance, control the third pressing roller 5c according to the third descent distance, control the fourth pressing roller 5d according to the fourth descent distance, control the first scraper roller 4a to rotate according to the rotation speed of the first scraper roller, and control the second scraper roller 4b to rotate according to the rotation speed of the second scraper roller.

[0090] The equipment is controlled according to the control parameters obtained in steps S602 to S604, so that the first scraper roller 4a can perform coarse removal on the masking tape, and the second scraper roller 4b can perform fine finishing on the masking tape.

[0091] When the verification result is negative, the method for the scraper roller 4 to perform secondary processing on the masking tape includes the following steps: Step S610: Locate the scanning units with different color depths.

[0092] When the system detects a scanning unit with a different color depth using an industrial camera, it locates the scanning unit and marks it as an abnormal unit.

[0093] Step S611: Simultaneously drive the first pressure roller 5a and the second pressure roller 5b to descend by a preset additional descent distance to increase the redundant coating amount.

[0094] The increased descent distance is a control parameter set by the technician for the first and second pressure rollers 5a and 5b. By controlling the descent of the first and second pressure rollers 5a and 5b through the increased descent distance, the coating amount of the coating roller 3 on the masking tape can be increased.

[0095] Step S612: Control the scanning unit with different color depths to move to the preset processing position, and stop the coating roller 3 for a preset pause time.

[0096] The processing location is a designated spot set by technicians specifically for applying additional adhesive to masking tape that is missing material on the surface.

[0097] In this embodiment, the scanning unit is moved to the processing position by moving the masking tape. At this time, the section of the masking tape with increased release agent has also left the coating roller 3. The scanning unit with different color depth and the section of the masking tape with increased release agent are both located between the coating roller 3 and the second pressing roller 5b.

[0098] The pause time is a dedicated operation time set by technicians for replenishing the masking tape with insufficient material on the surface. The pause time is short and does not affect the normal coating process of the equipment. When the scanning unit with inconsistent color depth moves to the processing position, the system controls the coating roller 3 to stop rotating, at which point the masking tape with insufficient material on the surface is replenished with adhesive.

[0099] Step S613: During the pause time, control the preset dispensing roller to move along the masking tape to the scanning unit with different color depths. The moving direction is from the coating roller 3 to the first scraper roller 4a, so as to roll the release agent in the scanning unit with a large amount of redundant coating to the scanning unit with different color depths.

[0100] In this embodiment, a dispensing roller is slidably installed between the coating roller 3 and the second pressing roller 5b. After the second pressing roller 5b is adjusted to descend by the added descent distance, the dispensing roller can come into contact with the surface of the masking tape. At this time, the system controls the dispensing roller to move along the masking tape, rolling the release agent in the section of the masking tape with increased release agent to the processing position, thereby replenishing the masking tape with insufficient release agent in the processing position.

[0101] Step S614: After completing the glue separation, control the first pressing roller 5a, the second pressing roller 5b and the glue separation roller to reset.

[0102] After the masking tape that is missing material on the surface in the treatment position is filled with adhesive, the system controls the first pressing roller 5a, the second pressing roller 5b and the dispensing roller to reset, and continues the adhesive application process of the release agent.

[0103] The method for coating the masking tape with coating roller 3 includes the following steps: In this embodiment, when the coating roller 3 rolls through the release agent in the coating tank 7, the pores 35 on the surface of the coating roller 3 can accommodate the release agent. However, when the coating roller 3 comes into contact with the masking tape, the release agent in the pores 35 cannot be completely adsorbed onto the masking tape. Therefore, the extrusion of the release agent in the pores 35 is controlled by the pore structure 34 on the coating roller 3, making the release agent coating on the surface of the masking tape more precise.

[0104] Step S40: Determine the extrusion ratio based on the redundant coating amount and the preset cell capacity.

[0105] Cell capacity refers to the amount of release agent that can be contained in a single cell 35 of the coating roller 3.

[0106] The extrusion ratio refers to the proportion of release agent required for redundant coating to the amount of release agent in the cell capacity. The extrusion ratio is the quotient of redundant coating and cell capacity.

[0107] Step S41: Match the gas distribution volume of a single mesh cavity according to the extrusion ratio.

[0108] In this embodiment, an external air source supplies air to the coating roller 3, and the air quantitatively squeezes out the release agent in the cells 35 and blows it onto the surface of the masking tape for adsorption.

[0109] The air distribution per cell refers to the amount of air required to extrude the release agent within a single cell (35mm). The air distribution per cell is directly proportional to the extrusion ratio; the higher the extrusion ratio, the greater the air distribution per cell.

[0110] Step S42: Determine the total air volume based on the air volume of a single cell and the preset coating roller cell information.

[0111] The coating roller cell information is a fixed parameter of the coating roller 3, which includes the total number of single-row cells 35 of the coating roller 3 along the axial direction.

[0112] Total air distribution refers to the amount of air required by the coating roller 3 to extrude the release agent from all the cells 35 corresponding to the pores 34. The total air distribution is the product of the air distribution per cell and the cell information of the coating roller.

[0113] Step S43: When the coating roller 3 rotates, air is supplied according to the total air volume and the preset air temperature to extrude the release agent in the cells 35 on the surface of the coating roller 3 to the surface of the masking tape.

[0114] Gas temperature refers to the temperature of the air supplied by the external air source. A suitable temperature can warm the release agent and promote the adsorption of the release agent and the masking tape.

[0115] When the coating roller 3 coats the masking tape, the immersion depth of the coating roller 3 and the pressure between the coating roller 3 and the masking tape will affect the coating amount. In this embodiment, air is supplied to the mesh 35 of the outer roller body 32 through the air hole 34 of the inner roller body 31, and the release agent is simultaneously assisted in quantitative coating.

[0116] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A method for precise quantitative coating control of masking tape, characterized in that, include: Retrieve product coating requirements information; Based on the product coating demand information, the preset coating roller (3) is matched with the redundant coating amount when coating on the masking tape. The coating roller rotation speed is matched according to the redundant coating amount, the preset immersion depth, and the preset coating roller size. The coating roller (3) is rotated according to the rotation speed of the coating roller to coat the masking tape surface, and the preset scraper (91) is controlled according to the preset gap distance to initially remove excess release agent from the surface of the coating roller (3). After coating, the excess adhesive removal amount is determined based on the redundant coating amount and product coating requirements. The masking tape image information is collected in real time, and the excess adhesive removal amount is verified by combining the masking tape image information to obtain the verification result. Based on the excess adhesive removal amount and the verification results, the preset adhesive scraper (4) is controlled to perform secondary processing on the masking tape.

2. The method for precise quantitative coating control of masking tape according to claim 1, characterized in that, The verification results include positive and negative results; the methods for verifying excess adhesive removal include: The masking tape is illuminated with a preset lighting intensity; Image analysis of the masking tape image information is performed from the light-transmitting back of the masking tape using a preset cyclic scanning method to obtain color depth information at various locations on the masking tape. The masking tape is divided into scanning units with a preset scanning width along the conveying direction; When the color depth information at each position in the scanning unit is consistent with the preset reference color depth, the verification result is a positive result, the verification of excess adhesive removal is completed, and the verification result is output. When the color depth information at each position in the scanning unit is inconsistent with the reference color depth, the difference in color depth is identified based on the reference color depth; Based on the comparison between the differential color depth and the reference color depth, the verification result is determined to be either positive or negative, and the verification result is output.

3. The method for precise quantitative coating control of masking tape according to claim 2, characterized in that, When the verification result is positive, the method for the scraper roller (4) to perform secondary processing on the masking tape includes: The preset pressing rollers (5) are numbered along the conveying direction of the masking tape. The pressing roller (5) on the input side of the coating roller (3) is designated as the first pressing roller (5a), the pressing roller (5) on the output side of the coating roller (3) is designated as the second pressing roller (5b), the pressing roller (5) on the output side of the preset first scraper roller (4a) is designated as the third pressing roller (5c), and the pressing roller (5) on the output side of the preset second scraper roller (4b) is designated as the fourth pressing roller (5d). The first pressing roller (5a) and the second pressing roller (5b) are located on both sides of the coating roller (3), the second pressing roller (5b) and the third pressing roller (5c) are located on both sides of the first scraper roller (4a), and the third pressing roller (5c) and the fourth pressing roller (5d) are located on both sides of the second scraper roller (4b). The excess adhesive removal amount is divided into a first-stage adhesive removal amount and a second-stage adhesive removal amount based on the preset fine processing allowance range; The second descent distance of the second pressing roller (5b), the third descent distance of the third pressing roller (5c), and the fourth descent distance of the fourth pressing roller (5d) are matched based on the first and second stages of adhesive removal. The rotation speed of the first scraper roller is matched with the amount of adhesive removed and the rotation speed of the coating roller. The rotation speed of the second scraper roller is set according to the rotation speed of the coating roller; The second pressing roller (5b) is controlled according to the second descent distance, the third pressing roller (5c) is controlled according to the third descent distance, the fourth pressing roller (5d) is controlled according to the fourth descent distance, the first scraper roller (4a) is controlled according to the rotation speed of the first scraper roller, and the second scraper roller (4b) is controlled according to the rotation speed of the second scraper roller.

4. The method for precise quantitative coating control of masking tape according to claim 3, characterized in that, When the difference color depth is less than the reference color depth, the verification result is negative; when the verification result is negative, the method of secondary processing of the masking tape by the scraper roller (4) includes: Locate scanning units with varying color depths; The first pressure roller (5a) and the second pressure roller (5b) are driven to descend synchronously by a preset increase in descent distance to increase the redundant coating amount; The scanning unit with different color depths is controlled to move to a preset processing position, and the coating roller (3) is stopped for a preset pause time; During the pause time, the preset dispensing roller is controlled to move along the masking tape to the scanning unit with different color depths. The moving direction is from the coating roller (3) to the first scraper roller (4a) so as to roll the release agent in the scanning unit with a large amount of redundant coating to the scanning unit with different color depths. After the glue separation is completed, control the first pressing roller (5a), the second pressing roller (5b) and the glue separation roller to reset.

5. The method for precise quantitative coating control of masking tape according to claim 4, characterized in that, The method of coating the masking tape with a coating roller (3) includes: The extrusion ratio is determined based on the redundant coating amount and the preset cell capacity. Match the gas distribution volume of a single mesh cavity according to the extrusion ratio; The total air volume is determined based on the air volume per cell and the preset cell information of the coating roller. When the coating roller (3) rotates, air is supplied according to the total air volume and the preset air temperature to squeeze the release agent in the mesh (35) on the surface of the coating roller (3) onto the surface of the masking tape.

6. A precision quantitative coating device for masking tape, controlled by the precision quantitative coating control method for masking tape as described in claim 5, characterized in that, It includes several guide rollers (2) for guiding the conveying of masking tape, coating rollers (3) for coating the masking tape, scraper rollers (4) for scraping off excess coating on the surface of the masking tape, and pressure rollers (5) for pressing the masking tape against the coating rollers (3) and scraper rollers (4).

7. The precision quantitative coating device for masking tape according to claim 6, characterized in that, It also includes a drive base (1) for driving the coating roller (3) and the scraper roller (4) to rotate; a lifting adjustment mechanism (6) for adjusting the pressing force of the masking tape is provided between the pressing roller (5) and the drive base (1). The lifting adjustment mechanism (6) includes a sliding seat (61) slidably mounted on the drive base (1), a lifting cylinder (62) that drives the sliding seat (61) to rise and fall, and a fine-tuning threaded rod (63) vertically rotatably mounted on the sliding seat (61); the end of the pressing roller (5) is threadedly connected to the fine-tuning threaded rod (63).

8. The precision quantitative coating device for masking tape according to claim 7, characterized in that, The drive base (1) is provided with a coating tank (7) for storing release agent and a collection tank (8) for collecting dripping release agent; the lower end of the coating roller (3) extends into the coating tank (7) and is immersed in the release agent; the collection tank (8) is connected to an external recycling bin to recycle and reuse the release agent.

9. The precision quantitative coating device for masking tape according to claim 8, characterized in that, The coating roller (3) is provided with a scraper structure (9), the scraper structure (9) includes a scraper (91) and a mounting bracket (92) for mounting the scraper (91) on the drive base (1); the edge of the scraper (91) is close to the surface of the coating roller (3) and has a gap between it and the surface of the coating roller (3) for a quantitative release agent to pass through; the scraper (91) is inclined toward the collection tank (8).

10. A precision quantitative coating device for masking tape according to claim 6, characterized in that, The coating roller (3) includes an inner roller body (31) and an outer roller body (32) that rotates relative to the inner roller body (31); the outer roller body (32) has an array of cavities (35) on its surface for the release agent to be adsorbed into; the inner roller body (31) is connected to an external air source, and an air hole (34) is provided on the top of the inner roller body (31), the air hole (34) facing the masking tape; when the cavities (35) and the air holes (34) are aligned, the release agent in the cavities (35) is blown to the surface of the masking tape for adsorption.

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