A precision coating control device and process

Abstract

The present application relates to coating device technical field, specifically to a kind of precision coating control device and process, precision coating control device includes pedestal, the pedestal is equipped with tension adjusting roller, micro gravure coating roller, slurry tank and auxiliary roller;The tension adjusting roller is used to transmit base film;The rotating direction of the micro gravure coating roller is opposite to the transmission direction of base film, the outer surface of the micro gravure coating roller is uniformly distributed with recess hole;The slurry tank is set to the lower of the micro gravure coating roller, its inside has stored slurry;The lower part of the micro gravure coating roller is immersed in the slurry of slurry tank, auxiliary roller is attached with micro gravure coating roller Settings, and auxiliary roller and micro gravure coating roller synchronous reverse rotation;Multiple suction members are provided on the auxiliary roller, the suction member can form negative pressure before the recess hole is immersed in slurry tank, so that recess hole absorbs material more fully, no bubble, filling is more stable, guarantee the coating quality of micro gravure coating roller.

Description

Technical Field

[0001] This invention relates to the field of coating equipment technology, and in particular to a precision coating control device and process. Background Technology

[0002] Currently, semiconductor wafers often require coating during processing, which involves forming a liquid film with precise thickness and extremely high uniformity on the wafer surface. Coating methods include air knife coating, comma blade coating, wire rod coating, reverse roller coating, microgravure coating, slot die coating, slope flow coating, and curtain coating, etc. Users can choose the appropriate coating method based on the rheological properties of the coating liquid and product requirements.

[0003] For example, patent document CN120824512B discloses a dynamic roll forming device for gradient pore membranes used in silicon-based anodes, including a modular coating unit. This modular coating unit comprises a slit coating mechanism, a spray coating mechanism, and a microgravure coating mechanism arranged sequentially. The microgravure coating mechanism uses a reverse contact process, quantitatively transferring slurry through roller holes, and achieving precise coating after removing excess material with a doctor blade. However, air bubbles are prone to appear inside the holes when adhering to the slurry tank, leading to inconsistent slurry adhesion amounts and the inclusion of air bubbles in the slurry adhering to the base film, reducing coating quality and affecting the appearance and performance of the finished product. Summary of the Invention

[0004] Therefore, it is necessary to provide a precision coating control device and process to address the technical problem of air bubbles in the current micro-gravure coating mechanism during the coating process, which reduces the coating quality.

[0005] The above objectives are achieved through the following technical solutions:

[0006] A precision coating control device includes a base, on which are mounted a tension adjusting roller, a micro-gravure coating roller, a slurry tank, and an auxiliary roller. Two tension adjusting rollers are provided, rotating synchronously and in the same direction to transfer a base film. The micro-gravure coating roller is located below and between the two tension adjusting rollers, with its axis parallel to the axis of the tension adjusting rollers and rotating in the opposite direction. The base film is bonded between the tension adjusting rollers and the micro-gravure coating roller. The outer surface of the micro-gravure coating roller has uniformly distributed concave holes. The slurry tank is located within the micro-gravure coating roller. Below the gravure coating roller, a slurry is stored inside. The lower part of the micro-gravure coating roller is immersed in the slurry in the slurry tank so that the concave holes can be filled with slurry and coated onto the surface of the base film. A first scraper is provided on one side of the slurry tank, which is attached to the surface of the micro-gravure coating roller to scrape off excess slurry from the surface of the micro-gravure coating roller. An auxiliary roller is located on the side of the slurry tank away from the first scraper. The auxiliary roller is attached to the micro-gravure coating roller and rotates synchronously in opposite directions with the micro-gravure coating roller. The auxiliary roller is provided with multiple suction components, which can create a negative pressure in the concave holes before immersion in the slurry tank.

[0007] Furthermore, the auxiliary roller includes a rotating shaft, an alloy sleeve, and a rubber sleeve arranged coaxially from the inside to the outside. The outer surface of the rubber sleeve is provided with multiple circumferentially evenly distributed arc-shaped grooves. The axis of the arc-shaped grooves is parallel to the axis of the rotating shaft. The rubber sleeve can be radially deformed under the pressure of the micro-gravure coating roller, thereby forming a closed cavity between the arc-shaped grooves and the outer surface of the micro-gravure coating roller. The suction member is simultaneously inserted on the alloy sleeve and the rubber sleeve. The suction member draws gas from the closed cavity, thereby creating a negative pressure in the concave hole.

[0008] Furthermore, the rubber sleeve is provided with a first through hole extending radially therefrom, and the alloy sleeve is provided with a second through hole extending radially therefrom. The first through hole and the second through hole correspond one-to-one. A suction space is formed between the alloy sleeve and the rotating shaft. The suction component is a suction needle with a hollow structure. The suction needle is fixedly installed in the first through hole and slidably inserted in the second through hole. The two ends of the suction needle along its length are an outer end and an inner end, respectively. The outer end is flush with the outer surface of the rubber sleeve, and the inner end is integrally formed with a sealing block, which is located in the suction space.

[0009] Furthermore, the suction needle has a central hole inside and a suction side hole on its outer circumferential surface. The suction side hole communicates with the central hole. The sealing block has a sealing element on the side facing the alloy sleeve. In the initial state, the suction side hole is located in the second through hole, and the sealing block seals the second through hole through the sealing element. When the rubber sleeve is deformed by the pressure of the micro-gravure coating roller, the suction needle moves radially along the rotating shaft and drives the sealing element on the sealing block to disengage from the second through hole, thereby connecting the suction side hole with the suction space.

[0010] Furthermore, the suction needles are arranged in multiple rows and evenly distributed around the circumference of the auxiliary roller. The arrangement direction of each row of suction needles is set at an angle to the axis of the rotating shaft, and the distance between two adjacent rows of suction needles is less than twice the chord length of the arc groove.

[0011] Furthermore, the rotating shaft has multiple suction channels extending radially inside, and a central channel extending axially at its center. Each suction channel is simultaneously connected to the suction space and the central channel, and the central channel is connected to an external suction pump.

[0012] Furthermore, the base is provided with a drive motor, which is used to drive the rotating shaft to rotate. A rotary joint is rotatably provided at the end of the rotating shaft away from the drive motor, which is used to connect the central channel with an external suction pump.

[0013] Furthermore, the slurry tank has an arc-shaped surface on the side near the auxiliary roller, and the arc-shaped surface is in clearance fit with the outer surface of the auxiliary roller; the upper end of the arc-shaped surface is provided with a second scraper, which is attached to the outer surface of the auxiliary roller and is used to scrape off the slurry on the outer surface of the auxiliary roller.

[0014] Furthermore, the diameter of the auxiliary roller is not equal to the diameter of the microgravure coating roller.

[0015] A precision coating control process, employing the aforementioned precision coating control device, includes the following steps:

[0016] S1. Control the two tension adjusting rollers to rotate synchronously and in the same direction to transfer the base film;

[0017] S2. Control the micro-gravure coating roller to rotate in the opposite direction to the rotation direction of the tension adjusting roller, and immerse the lower part of the micro-gravure coating roller in the slurry of the slurry tank;

[0018] S3. Control the auxiliary roller and the micro-gravure coating roller to rotate synchronously in opposite directions, so that the rubber sleeve of the auxiliary roller is radially deformed under the pressure of the micro-gravure coating roller, thereby forming a closed cavity between the arc groove and the outer surface of the micro-gravure coating roller.

[0019] S4. The gas in the closed chamber is drawn out by the suction device, so that the concave holes on the surface of the micro-gravure coating roller form a negative pressure before being immersed in the slurry tank. Then, the concave holes with negative pressure are automatically filled with slurry after being immersed in the slurry tank, and the slurry is coated onto the surface of the base film.

[0020] The beneficial effects of this invention are:

[0021] The precision coating control device provided by the present invention, firstly, by setting an auxiliary roller and setting a suction component on the auxiliary roller, a negative pressure is formed in the concave holes on the microgravure coating roller before immersion in the slurry tank, so that the concave holes can absorb material more fully, without air bubbles, and with more stable filling, thereby ensuring the coating quality of the microgravure coating roller.

[0022] Second, the suction component can suck up the residual slurry in the recesses of the micro-gravure coating roller to prevent the formation of solidified slurry.

[0023] Third, as the auxiliary roller rotates, only when the area where the rubber sleeve contacts the micro-gravure coating roller is compressed and undergoes radial deformation will the suction side hole on the corresponding suction needle in that area connect with the suction space. When this area of ​​the rubber sleeve is not compressed, the rubber sleeve will automatically and elastically reset, causing the suction needle to slide relative to the second through hole, allowing the sealing gasket to enter the slot and block the second through hole. Thus, the suction side hole on the suction needle is blocked in the second through hole, disconnecting the suction side hole from the suction space. At this time, the suction needle cannot suction, preventing the suction needle from suctioning slurry after rotating to the slurry tank position. At the same time, the movement of the suction needle can increase the pressure in the closed chamber, causing the auxiliary roller and the micro-gravure coating roller to separate. Until this area of ​​the rubber sleeve is compressed again, the suction needle remains closed, ensuring the suction strength of the closed chamber next time.

[0024] Fourth, the suction needles on the auxiliary roller contact different positions with the concave holes on the micro-gravure coating roller each time, and after multiple rotations, each concave hole of the micro-gravure coating roller can be suctioned.

[0025] Fifth, by injecting positive pressure gas into the suction needle, the slurry inside the suction needle can be discharged, and at the same time, the slurry inside the concave holes of the micro-gravure coating roller can be cleaned. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of a precision coating control device provided in an embodiment of the present invention;

[0027] Figure 2 This is a top view schematic diagram of a precision coating control device provided in an embodiment of the present invention;

[0028] Figure 3 for Figure 2 Schematic diagram of the cross-section of XX.

[0029] Figure 4 for Figure 3 Enlarged view of the structure at point A in the middle;

[0030] Figure 5 This is a schematic diagram of the structure of the micro-gravure coating roller and the auxiliary roller in a precision coating control device provided in an embodiment of the present invention;

[0031] Figure 6 for Figure 5 Enlarged view of the structure at point B in the middle;

[0032] Figure 7 for Figure 5 Enlarged view of the structure at point C;

[0033] Figure 8 A cross-sectional view of the rotating shaft in a precision coating control device provided in an embodiment of the present invention. Figure 1 ;

[0034] Figure 9 for Figure 8 Enlarged view of the structure at point D;

[0035] Figure 10 for Figure 8 Enlarged view of the structure at point E in the middle;

[0036] Figure 11 A cross-sectional view of the rotating shaft in a precision coating control device provided in an embodiment of the present invention. Figure 2 ;

[0037] Figure 12 for Figure 11 Enlarged view of the structure at point F in the middle;

[0038] Figure 13 for Figure 12 Enlarged view of the structure at point G in the middle;

[0039] Figure 14 for Figure 12 Enlarged view of the structure at point H in the middle;

[0040] Figure 15 This is a schematic diagram of the suction needle in a precision coating control device provided in an embodiment of the present invention.

[0041] in:

[0042] 100, Base; 200, Tension Adjusting Roller; 300, Microgravure Coating Roller; 400, Slurry Tank; 410, Arc-shaped Surface; 420, Second Scraper; 430, Storage Chamber; 500, Auxiliary Roller; 510, Rotary Joint; 520, Rotating Shaft; 521, Central Channel; 522, Suction Channel; 530, Alloy Sleeve; 531, Suction Space; 532, Second Through Hole; 5321, Slot; 540, Rubber Sleeve; 541, Arc-shaped Groove; 542, First Through Hole; 550, Suction Needle; 551, Sealing Block; 553, Central Hole; 554, Suction Side Hole; 555, Sealing Component; 600, First Scraper; 700, Closed Chamber. Detailed Implementation

[0043] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0044] The component designations used in this document, such as "first" and "second," are merely for distinguishing the described objects and do not have any sequential or technical meaning. The terms "connection" and "linkage" used in this invention, unless otherwise specified, include both direct and indirect connections (linkages). It should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0045] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0046] like Figures 1 to 15As shown, an embodiment of the present invention provides a precision coating control device, including a base 100, on which tension adjusting rollers 200, micro-gravure coating rollers 300, slurry tanks 400, and auxiliary rollers 500 are provided. Two tension adjusting rollers 200 are provided, and the two tension adjusting rollers 200 rotate synchronously and in the same direction to transfer the base film. The micro-gravure coating roller 300 is located below the two tension adjusting rollers 200, with its axis parallel to the axis of the tension adjusting rollers 200, and its rotation direction opposite to that of the tension adjusting rollers 200. The base film is bonded between the tension adjusting rollers 200 and the micro-gravure coating roller 300, such that the tangential direction of the bonding position between the micro-gravure coating roller 300 and the base film is opposite to the transfer direction of the base film. The outer surface of the film has uniformly distributed recesses; the slurry tank 400 is located below the micro-gravure coating roller 300 and stores slurry inside; the lower part of the micro-gravure coating roller 300 is immersed in the slurry in the slurry tank 400 so that the recesses can be filled with slurry and coated onto the surface of the base film; a first scraper 600 is provided on one side of the slurry tank 400, which is attached to the surface of the micro-gravure coating roller 300 and used to scrape off excess slurry from the surface of the micro-gravure coating roller 300; an auxiliary roller 500 is located on the side of the slurry tank 400 away from the first scraper 600, and is attached to the micro-gravure coating roller 300, and the auxiliary roller 500 and the micro-gravure coating roller 300 rotate synchronously in opposite directions; the auxiliary roller 500 is provided with multiple suction components, which can create a negative pressure in the recesses before they are immersed in the slurry tank 400.

[0047] Specifically, the base 100 is equipped with a storage tank, which is used to continuously replenish the slurry tank 400 to keep the liquid level in the slurry tank 400 consistent. The first scraper 600 can scrape off excess slurry on the surface of the micro-gravure coating roller 300 to ensure consistent coating thickness.

[0048] The precision coating control device provided by this invention, by incorporating a suction component, creates a negative pressure in the recesses of the microgravure coating roller 300 before immersion in the slurry tank 400. This ensures more thorough material absorption, eliminates air bubbles, and achieves more stable filling, thereby guaranteeing the coating quality of the microgravure coating roller 300. Simultaneously, the suction component can remove residual slurry from the recesses of the microgravure coating roller 300, preventing the formation of solidified slurry.

[0049] Furthermore, the auxiliary roller 500 includes a rotating shaft 520, an alloy sleeve 530, and a rubber sleeve 540 arranged coaxially from the inside to the outside. The outer surface of the rubber sleeve 540 is provided with a plurality of circumferentially evenly distributed arc-shaped grooves 541. The axis of the arc-shaped grooves 541 is parallel to the axis of the rotating shaft 520. The rubber sleeve 540 can be radially deformed under the pressure of the micro-gravure coating roller 300, thereby forming a closed chamber 700 between the arc-shaped grooves 541 and the outer surface of the micro-gravure coating roller 300. The suction member is simultaneously inserted on the alloy sleeve 530 and the rubber sleeve 540. The suction member draws gas from the closed chamber 700, thereby creating a negative pressure in the concave hole.

[0050] The three-layer structure of the rotating shaft 520, alloy sleeve 530, and rubber sleeve 540 takes into account both rigidity and elastic deformation. The arc groove 541 is bonded to the micro-gravure coating roller 300 to form a closed chamber 700, which provides a sealed space for negative pressure suction. The rubber sleeve 540 deforms radially under pressure, which automatically seals the chamber and ensures that the negative pressure is established stably.

[0051] Furthermore, the rubber sleeve 540 is provided with a first through hole 542 extending radially therefrom, and the alloy sleeve 530 is provided with a second through hole 532 extending radially therefrom. The first through hole 542 and the second through hole 532 correspond one-to-one. A suction space 531 is formed between the alloy sleeve 530 and the rotating shaft 520. The suction component is a suction needle 550, which has a hollow structure. The suction needle 550 is fixedly disposed in the first through hole 542 and slidably disposed in the second through hole 532. The two ends of the suction needle 550 along the length direction are an outer end and an inner end, respectively. The outer end is flush with the outer surface of the rubber sleeve 540, and the inner end is integrally formed with a sealing block 551. The sealing block 551 is located in the suction space 531.

[0052] In this way, the rubber sleeve 540 of the area where the auxiliary roller 500 contacts the micro-gravure coating roller 300 will be compressed and deformed radially, thereby causing the suction needle 550 to slide relative to the second through hole 532, and causing the sealing block 551 to move.

[0053] Furthermore, the suction needle 550 has a central hole 553 inside and a suction side hole 554 on its outer peripheral surface. The suction side hole 554 communicates with the central hole 553. The sealing block 551 has a sealing element 555 on the side facing the alloy sleeve 530. In the initial state, the suction side hole 554 is located in the second through hole 532, and the sealing block 551 seals the second through hole 532 through the sealing element 555. When the rubber sleeve 540 is deformed by the micro-gravure coating roller 300, the suction needle 550 moves radially along the rotating shaft 520 and drives the sealing element 555 on the sealing block 551 to disengage from the second through hole 532, thereby making the suction side hole 554 communicate with the suction space 531. Specifically, the second through hole 532 has a slot 5321 on the side near the suction space 531, and the sealing element 555 is a sealing gasket. The sealing gasket can be inserted into the slot 5321 or detached from the slot 5321.

[0054] As the auxiliary roller 500 rotates, only when the area where the rubber sleeve 540 contacts the micro-gravure coating roller 300 is compressed and undergoes radial deformation will the suction side hole 554 on the corresponding suction needle 550 communicate with the suction space 531. When this area of ​​the rubber sleeve 540 is not compressed, the rubber sleeve 540 will automatically and elastically reset, causing the suction needle 550 to slide relative to the second through hole 532, allowing the sealing gasket to enter the slot 5321 and seal the second through hole 532, thereby blocking the suction side hole 554 on the suction needle 550. The suction needle 550 is blocked in the second through hole 532, which disconnects the suction side hole 554 from the suction space 531. At this time, the suction needle 550 cannot draw, which prevents the suction needle 550 from drawing slurry after rotating to the slurry tank 400 position. At the same time, the movement of the suction needle 550 can increase the pressure in the closed chamber 700, which causes the auxiliary roller 500 to separate from the micro-gravure coating roller 300. Until the area of ​​the rubber sleeve 540 is pressed again, the suction needle 550 always remains in a closed state, which can ensure the suction strength of the closed chamber 700 next time.

[0055] Furthermore, the suction needles 550 are arranged in multiple rows and evenly distributed around the auxiliary roller 500. The arrangement direction of each row of suction needles 550 is at an angle to the axis of the rotating shaft 520, and the distance between two adjacent rows of suction needles 550 is less than twice the chord length of the arc groove 541. The oblique arrangement of the suction needles 550 allows the suction area of ​​the suction needles 550 to continuously cover multiple arc grooves 541, ensuring that it can draw into the closed space formed by the arc grooves 541 and form a negative pressure.

[0056] Furthermore, the rotating shaft 520 has multiple suction channels 522 extending radially therein, and a central channel 521 extending axially at its center. Each suction channel 522 is simultaneously connected to the suction space 531 and the central channel 521, and the central channel 521 is connected to an external suction pump. The suction channels 522 are also distributed axially along the rotating shaft 520, thus achieving uniform suction of the suction space 531 and ensuring consistent suction force from the multiple suction needles 550.

[0057] Furthermore, a drive motor is provided on the base 100 to drive the rotating shaft 520 to rotate. A rotary joint 510 is rotatably provided at the end of the rotating shaft 520 away from the drive motor. The rotary joint 510 is used to connect the central channel 521 to an external suction pump. Specifically, the rotary joint 510 is a high-speed, high-pressure rotary valve, which can maintain reliable communication between the central channel 521 and the suction pump while the rotating shaft 520 is rotating, without tangling or leakage, and with stable operation.

[0058] Furthermore, the slurry tank 400 has an arc-shaped surface 410 on the side near the auxiliary roller 500, and the arc-shaped surface 410 is clearance-fitted with the outer surface of the auxiliary roller 500; the upper end of the arc-shaped surface 410 is provided with a second scraper 420, which is fitted against the outer surface of the auxiliary roller 500 and used to scrape off the slurry on the outer surface of the auxiliary roller 500. The second scraper 420 can prevent the slurry from entering the suction needle 550.

[0059] The second scraper 420 is a flexible scraper. The arc-shaped surface 410 and the auxiliary roller 500 form a storage cavity 430. When the second scraper 420 is worn, the slurry can enter the storage cavity 430 to prevent leakage. At the same time, the rotation of the auxiliary roller 500 can carry the slurry in the storage cavity 430 back to the slurry tank 400 to avoid waste.

[0060] In addition, by injecting positive pressure gas into the suction needle 550, the slurry inside the suction needle 550 can be discharged, and the slurry inside the concave hole of the micro-gravure coating roller 300 can be cleaned at the same time.

[0061] Furthermore, the diameter of the auxiliary roller 500 is not equal to the diameter of the microgravure coating roller 300. This ensures that the contact position between the suction needle 550 on the auxiliary roller 500 and the concave hole on the microgravure coating roller 300 is different each time, so that after multiple rotations, each concave hole of the microgravure coating roller 300 can be suctioned.

[0062] The base 100 is equipped with a power drive system, which is used to drive the tension adjustment roller 200, the auxiliary roller 500 and the micro-gravure coating roller 300 to rotate.

[0063] A precision coating control process, employing the aforementioned precision coating control device, includes the following steps:

[0064] S1. Control the two tension adjusting rollers 200 to rotate synchronously and in the same direction to transfer the base film;

[0065] S2. Control the micro-gravure coating roller 300 to rotate in the opposite direction to the rotation direction of the tension adjusting roller 200, and immerse the lower part of the micro-gravure coating roller 300 in the slurry of the slurry tank 400.

[0066] S3. Control the auxiliary roller 500 and the micro-gravure coating roller 300 to rotate synchronously in opposite directions, so that the rubber sleeve 540 of the auxiliary roller 500 is radially deformed under the pressure of the micro-gravure coating roller 300, thereby forming a closed cavity 700 between the arc groove 541 and the outer surface of the micro-gravure coating roller 300.

[0067] S4. The gas in the closed chamber 700 is drawn out by the suction device, so that the concave holes on the surface of the micro-gravure coating roller 300 form a negative pressure before being immersed in the slurry tank 400. Then, the concave holes with negative pressure are automatically filled with slurry after being immersed in the slurry tank 400, and the slurry is coated onto the surface of the base film.

[0068] Based on the above embodiments, the usage principle and working process of the embodiments of the present invention are as follows:

[0069] Start the power drive system to make the tension adjusting roller 200, auxiliary roller 500 and micro-gravure coating roller 300 start to rotate. The two tension adjusting rollers 200 rotate synchronously in the same direction, and the rotation direction of the micro-gravure coating roller 300 is opposite to the transmission direction of the base film. Start the external suction pump.

[0070] like Figure 5 As shown, the auxiliary roller 500 rotates counterclockwise (viewed from the direction facing the paper in the diagram), while the microgravure coating roller 300 rotates clockwise. At this time, as... Figures 11 to 14 As shown, with the rotation of the auxiliary roller 500, the area where the rubber sleeve 540 contacts the microgravure coating roller 300 is compressed and undergoes radial deformation, gradually forming a closed chamber 700 in this area. Simultaneously, the suction needle 550 corresponding to this area slides relative to the second through hole 532, thereby opening the second through hole 532 on the sealing block 551. This allows the suction side hole 554 on the suction needle 550 to connect with the suction space 531. The suction pump can then use the central channel 521, suction channel 522, suction space 531, and suction side hole 554 on the rotating shaft 520 to allow the suction needle 550 to suction the closed chamber 700, creating a negative pressure in the closed chamber 700. Consequently, the gas and a small amount of residual slurry in the recesses of the microgravure coating roller 300 are drawn out. Figure 4As shown, as the auxiliary roller 500 continues to rotate, this area gradually rotates to the position where it is separated from the microgravure coating roller 300. At this time, this area is no longer squeezed, and thus automatically and elastically resets, causing the suction needle 550 to slide relative to the second through hole 532, so that the sealing member 555 seals the second through hole 532 again. Thus, the suction side hole 554 on the suction needle 550 is sealed in the second through hole 532, so that the suction side hole 554 is disconnected from the suction space 531. At this time, the suction needle 550 no longer performs suction, avoiding the subsequent suction needle 550 from sucking the slurry in the slurry tank 400. At the same time, the movement of the suction needle 550 can increase the pressure in the closed chamber 700, causing the auxiliary roller 500 to quickly separate from the microgravure coating roller 300. Since the slurry tank 400 is provided with a second scraper 420, the slurry adhering to the outer surface of the auxiliary roller 500 will be scraped off by the second scraper 420. The suction needle 550 remains disconnected until the area of ​​the rubber sleeve 540 is compressed again, ensuring sufficient suction strength for the next enclosed chamber 700. After the concave holes on the microgravure coating roller 300 are immersed in the slurry tank 400, the slurry completely fills the concave holes. As the microgravure coating roller 300 rotates, the first scraper 600 removes excess slurry from the outer surface of the microgravure coating roller 300, ensuring the coating thickness of the base film.

[0071] When the auxiliary roller 500 and the micro-gravure coating roller 300 need to be cleaned periodically after a period of use, the auxiliary roller 500 and the micro-gravure coating roller 300 should be rotated in opposite directions synchronously. At the same time, positive pressure gas should be injected into the interior of the rotating shaft 520 through the suction pump. The gas should then enter the suction needle 550 through the central channel 521, the suction channel 522, and the suction space 531. This will allow the slurry and impurities in the suction needle 550 to be discharged, and at the same time, the solidified slurry in the concave hole of the micro-gravure coating roller 300 can be cleaned.

[0072] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0073] The embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the appended claims.

Claims

1. A precision coating control device, characterized by, Includes a base, on which tension adjusting roller, micro-gravure coating roller, slurry tank and auxiliary roller are provided; The tension regulating roller is provided in two parts, and the two tension regulating rollers rotate synchronously and in the same direction to transfer the base film; The micro-gravure coating roller is located below the two tension adjusting rollers. The axis of the micro-gravure coating roller is parallel to the axis of the tension adjusting roller, and the rotation direction of the micro-gravure coating roller is opposite to that of the tension adjusting roller. The base film is bonded between the tension adjusting roller and the micro-gravure coating roller. The outer surface of the micro-gravure coating roller has evenly distributed concave holes. The slurry tank is located below the microgravure coating roller and stores slurry inside. The lower part of the microgravure coating roller is immersed in the slurry in the slurry tank so that the concave holes can be filled with slurry and coated onto the surface of the base film. A first scraper is provided on one side of the slurry tank. The first scraper is attached to the surface of the microgravure coating roller and is used to scrape off excess slurry from the surface of the microgravure coating roller. The auxiliary roller is located on the side of the slurry tank away from the first scraper. The auxiliary roller is fitted to the micro-gravure coating roller, and the auxiliary roller and the micro-gravure coating roller rotate synchronously in opposite directions. The auxiliary roller is equipped with multiple suction components, which create negative pressure in the concave holes before immersion in the slurry tank. The auxiliary roller includes a rotating shaft, an alloy sleeve, and a rubber sleeve arranged coaxially from the inside to the outside. The outer surface of the rubber sleeve has multiple circumferentially evenly distributed arc-shaped grooves. Under the pressure of the micro-gravure coating roller, the rubber sleeve can deform radially, thereby forming a closed cavity between the arc-shaped grooves and the outer surface of the micro-gravure coating roller. The suction components are simultaneously inserted into both the alloy sleeve and the rubber sleeve, and the suction components achieve this through suction sealing. The gas in the closed chamber creates a negative pressure in the concave hole. The rubber sleeve has a first through hole extending radially therein, and the alloy sleeve has a second through hole extending radially therein. A suction space is formed between the alloy sleeve and the rotating shaft. The suction component is a suction needle with a hollow structure. The suction needle is fixedly installed in the first through hole and slidably installed in the second through hole. The suction needle has a central hole inside and a suction side hole on its outer circumference. The suction side hole communicates with the central hole. Only when the area where the rubber sleeve contacts the micro-gravure coating roller is compressed and undergoes radial deformation will the suction side hole on the corresponding area of ​​the suction needle communicate with the suction space.

2. The precision coating control device according to claim 1, characterized in that, The axis of the arc-shaped groove is parallel to the axis of the rotating shaft.

3. The precision coating control device according to claim 2, characterized in that, The first through hole and the second through hole correspond one-to-one. The two ends of the suction needle along the length direction are the outer end and the inner end, respectively. The outer end is flush with the outer surface of the rubber sleeve, and the inner end is integrally formed with a sealing block, which is located in the suction space.

4. The precision coating control device according to claim 3, characterized in that, The sealing block has a sealing element on the side facing the alloy sleeve. In the initial state, the suction side hole is located in the second through hole, and the sealing block seals the second through hole through the sealing element. When the rubber sleeve is deformed by the pressure of the micro-gravure coating roller, the suction needle moves radially along the rotating shaft and drives the sealing element on the sealing block to disengage from the second through hole, thereby connecting the suction side hole with the suction space.

5. The precision coating control device according to claim 4, characterized in that, The suction needles are arranged in multiple rows and are evenly distributed around the circumference of the auxiliary roller. The arrangement direction of each row of suction needles is set at an angle to the axis of the rotating shaft, and the distance between two adjacent rows of suction needles is less than twice the chord length of the arc groove.

6. The precision coating control device according to claim 5, characterized in that, The rotating shaft has multiple suction channels extending radially inside, and a central channel extending axially at its center. Each suction channel is connected to both the suction space and the central channel, and the central channel is connected to an external suction pump.

7. The precision coating control device according to claim 6, characterized in that, The base is equipped with a drive motor, which drives the rotating shaft to rotate. A rotary joint is rotatably provided at the end of the rotating shaft away from the drive motor, which is used to connect the central channel to an external suction pump.

8. The precision coating control device according to claim 2, characterized in that, The slurry tank has an arc-shaped surface on the side near the auxiliary roller, and the arc-shaped surface is in clearance fit with the outer surface of the auxiliary roller; a second scraper is provided at the upper end of the arc-shaped surface, and the second scraper is attached to the outer surface of the auxiliary roller for scraping off the slurry on the outer surface of the auxiliary roller.

9. The precision coating control device according to claim 2, characterized in that, The diameter of the auxiliary roller is not equal to the diameter of the microgravure coating roller.

10. A precision coating control process, employing the precision coating control device according to any one of claims 2 to 9, characterized in that, Includes the following steps: S1. Control the two tension adjusting rollers to rotate synchronously and in the same direction to transfer the base film; S2. Control the micro-gravure coating roller to rotate in the opposite direction to the rotation direction of the tension adjusting roller, and immerse the lower part of the micro-gravure coating roller in the slurry of the slurry tank; S3. Control the auxiliary roller and the micro-gravure coating roller to rotate synchronously in opposite directions, so that the rubber sleeve of the auxiliary roller is radially deformed under the pressure of the micro-gravure coating roller, thereby forming a closed cavity between the arc groove and the outer surface of the micro-gravure coating roller. S4. The gas in the closed chamber is drawn out by the suction device, so that the concave holes on the surface of the micro-gravure coating roller form a negative pressure before being immersed in the slurry tank. Then, the concave holes with negative pressure are automatically filled with slurry after being immersed in the slurry tank, and the slurry is coated onto the surface of the base film.

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