An apparatus for applying a composite conductive coating

Abstract

This utility model discloses an apparatus for coating a composite conductive coating, including an unwinding mechanism, a feeding mechanism, a coating mechanism, a post-processing mechanism, and a winding mechanism. The unwinding mechanism is used to unwind the substrate along a preset direction. The feeding mechanism includes multiple discharge pipes, each simultaneously discharging coating droplets, which are distributed in a rectangular array on the substrate surface. The coating mechanism includes a scraper and a support member spaced vertically. The scraper is positioned along the width of the substrate, and the scraper and support member form a coating gap. The substrate passes through the coating gap, and the coating droplets on the substrate surface are coated onto the substrate under the action of the scraper to form a coating layer. The post-processing mechanism is used to cure the substrate and the coating layer. The winding mechanism is located behind the post-processing mechanism and is used to wind up the cured substrate and coating layer. This application replaces the existing coater with a feeding mechanism and a coating mechanism to avoid the problem of uneven coating on the substrate in the prior art.

Description

Technical Field

[0001] This utility model relates to the field of coating device technology, and in particular to a device for coating composite conductive coatings. Background Technology

[0002] In precision coating processes, the blade roller (such as metering roller, coating roller, and anilox roller) is the core component for controlling the coating thickness and uniformity. The performance of its surface coating directly determines the quality of the final product, production efficiency, and cost control.

[0003] Currently, high-performance coatings such as ceramics, metal alloys, or polymers are widely used on the surface of cutter rollers to improve their wear resistance, corrosion resistance, and surface functionality. However, existing cutter roller coating technologies still face significant challenges in practical applications. Their coating structure design is simplistic, resulting in insufficient wear resistance and short service life; the bonding strength between the coating and the substrate is limited, making them prone to localized peeling under high-speed operation and frictional stress; insufficient surface energy control or easy clogging of the microstructure leads to poor coating transfer, difficult and frequent cleaning and maintenance. These problems not only cause frequent equipment downtime for repairs or roller replacements, increasing production costs and affecting production efficiency and product yield, but also contradict the current advocacy for efficient, stable, energy-saving, and low-consumption green intelligent manufacturing development.

[0004] To address the aforementioned problems, existing technologies, such as patent application number CN201910861900.8 entitled "A Device for Roll-to-Roll Continuous Transfer of Graphene," utilize a coater instead of a blade roller for coating operations. The coater has an outlet positioned along the width of the film (substrate), connected to a dispensing chamber. This dispensing chamber cooperates with a material feeding and coating mechanism to introduce coating material into the dispensing chamber, which is then discharged from the outlet, covering the substrate surface to achieve the coating purpose.

[0005] However, since the outlet is distributed along the width of the base, when the coating is extruded along the outlet, there is an uneven distribution of the coating along the length of the outlet, resulting in uneven coating on the substrate by the coating device with the above structure. Utility Model Content

[0006] To address the shortcomings of existing technologies, this invention provides an apparatus for coating composite conductive coatings, which enables continuous, uniform, and controllable coating of composite conductive coatings on the surface of graphene conductive substrates, solving the problems of poor coating uniformity, difficulty in thickness control, and low production efficiency.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: an apparatus for coating a composite conductive coating, comprising an unwinding mechanism, a feeding mechanism, a coating mechanism, a post-processing mechanism, and a winding mechanism;

[0008] The unwinding mechanism is used to feed the substrate along a preset direction, allowing it to enter the feeding mechanism;

[0009] The feeding mechanism includes multiple discharge pipes arranged along the width of the substrate, and each discharge pipe discharges material simultaneously to form coating droplets on the substrate;

[0010] The coating mechanism includes a doctor blade and a support member arranged at intervals. The doctor blade is arranged along the width direction of the substrate, and the doctor blade and the support member form a coating gap. The substrate passes through the coating gap, and the coating droplets on the surface of the substrate are coated onto the substrate under the action of the doctor blade to form a coating layer.

[0011] The post-processing unit is used to cure the substrate and coating layer;

[0012] The winding mechanism is located behind the post-processing mechanism and is used to wind up the cured substrate and coating layer.

[0013] The principle of this application:

[0014] The rolled substrate (graphene film substrate) is mounted on the unwinding mechanism and unwound under a certain tension. The substrate is unwound to the feeding mechanism, which is an equivalent of the existing technology (CN201910861900.8) to a feeding coating mechanism. It mainly pumps out the molten coating and discharges it from each discharge pipe. Alternatively, the feeding mechanism can be the feeding mechanism used in the existing dispensing process, which can drop the molten coating onto the substrate surface in a dripping or continuous manner to form coating droplets. The doctor blade of the coating mechanism is set close to each discharge pipe. The cooperation between the doctor blade and the support can "smooth" the rectangular array of coating droplets, so that the coating covers the substrate as a coating layer. Then, a curing treatment is performed to obtain the finished composite material. Finally, the winding mechanism is used to rewind the substrate to complete the coating operation.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] This application replaces the existing coater with a feeding mechanism and a coating mechanism. The feeding mechanism first feeds material onto the substrate, and the coating droplets can be continuous strips or dots. This droplet structure can reduce paint waste compared to the existing coating-like feeding method. The doctor blade is set separately to process the coating droplets on the substrate and smooth them out, forming a coating with a more uniform thickness, thus avoiding the problem of uneven coating on the substrate in the prior art.

[0017] Furthermore, the unwinding mechanism includes an unwinding roller, a tension adjusting roller, and a tension detection roller arranged in sequence. The unwinding roller is used to wind the substrate, the tension adjusting roller is used to adjust the tension of the substrate, and the tension detection roller is used to detect the tension of the substrate.

[0018] Furthermore, a pretreatment assembly is provided between the unwinding mechanism and the feeding mechanism. The pretreatment assembly includes an air knife arranged along the width direction of the substrate, with the air nozzle facing the surface of the substrate. The air knife is used to spray clean compressed air.

[0019] Furthermore, a pretreatment assembly is provided between the unwinding mechanism and the feeding mechanism. The pretreatment assembly includes an air knife arranged along the width direction of the substrate, with the air nozzle facing the surface of the substrate. The air knife is used to spray clean compressed air.

[0020] Furthermore, the support includes a support plane, and the bottom of the substrate slides along the support plane in contact with the support plane;

[0021] The scraper is connected to a lifting assembly, which is used to change the gap between the bottom of the scraper and the support plane.

[0022] Furthermore, waste liquid tanks are provided on both sides of the support plane along the width direction of the substrate, and the scraper is located in the two waste liquid tanks on both sides along the width direction of the substrate.

[0023] Furthermore, the lower part of the scraper has an inwardly recessed arc-shaped notch on the side near the coating droplet. The arc-shaped notch extends along the length of the scraper and has a structure that narrows from the middle to both ends. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of this utility model;

[0025] Figure 2 This is a schematic diagram of the cooperative structure of the scraper and the lifting assembly in this utility model;

[0026] Figure 3 This is a diagram showing the positional relationship between the scraper and the support in this utility model;

[0027] Figure 4 This is a layout diagram of the various discharge pipes in this utility model.

[0028] In the diagram: substrate 100, air knife 200, unwinding mechanism 300, unwinding roller 310, tension adjusting wheel 320, tension detection roller 330, transition roller 400, post-processing mechanism 500, take-up roller 600, coating mechanism 700, support component 710, support platform 711, waste liquid tank 712, scraper 720, arc notch 721, lifting frame 722, drag chain lifting device 723, coating gap 730, feeding mechanism 800, discharge pipe 810, metering pump 820, feeding tank 830. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0030] like Figure 1-4 As shown, an apparatus for coating a composite conductive coating is actually a coating system that utilizes a combination of existing components to coat a uniform coating layer onto a substrate 100 to form a composite material. Specifically, the apparatus includes an unwinding mechanism 300, a feeding mechanism 800, a coating mechanism 700, a post-processing mechanism 500, and a winding mechanism.

[0031] like Figure 1 As shown, the unwinding mechanism 300 is used to unwind the substrate 100 along a preset direction. It includes an unwinding roller 310, a tension adjusting roller 320, and a tension detection roller 330 arranged sequentially. The unwinding roller 310 is used to wind the substrate 100, the tension adjusting roller is used to adjust the tension of the substrate 100, and the tension detection roller 330 is used to detect the tension of the substrate 100. In use, the rolled substrate 100 is mounted on the unwinding roller 310; the unwinding motor cooperating with the unwinding roller 310 drives the substrate 100 to release, and the substrate 100 passes through the tension adjusting roller and the tension detection roller 330 in sequence; the tension detection roller 330 receives the detection signal in real time and coordinates the speed of the unwinding motor and the position of the tension adjusting roller to achieve constant tension operation of the substrate 100.

[0032] To enhance the coverage of the coating and substrate 100, this application requires pretreatment before coating the substrate 100 to remove surface dust and eliminate static electricity. For this purpose, a pretreatment is performed behind the tension detection roller 330, such as... Figure 1 As shown, a pretreatment assembly is also provided, which includes an air knife 200 arranged along the width direction of the substrate 100. The air knife 200 is an ion air knife 200 as described in the prior art. The air nozzle of the air knife 200 faces the surface of the substrate 100, and the air knife 200 is used to spray clean compressed air. By spraying clean compressed air through the non-contact air knife 200, floating dust on the surface of the substrate 100 can be removed.

[0033] The pretreated substrate 100 will enter the feeding mechanism 800 to achieve "dispensing" or continuous dispensing feeding, such as... Figure 1 , 4As shown, the feeding mechanism 800 includes a feeding tank 830, a metering pump 820, and multiple discharge pipes 810 arranged along the width direction of the substrate 100. The metering pump 820 introduces the coating material in the feeding tank 830 into each discharge pipe 810 according to a preset pressure. The coating material is simultaneously discharged from each discharge pipe 810, forming coating droplets on the substrate 100. The coating droplets can be continuous strips or dots. The metering pump 820 can be operated at a constant power by program control (PLC control unit), in which case the coating droplets are continuous strips. Alternatively, the metering pump 820 can be started and stopped in a pulse manner, in which case the coating droplets can be continuous dots. The discharge pipes 810 can be arranged adjacently or with small gaps, as long as it is ensured that the scraper 720 can level each coating droplet on the substrate 100 to form a coating when scraping.

[0034] After the coating material is applied to the substrate 100, it needs to be smoothed using the coating mechanism 700. Therefore, this application also includes a coating mechanism 700, such as... Figure 1 , 2 As shown in Figure 3, the coating mechanism 700 includes a doctor blade 720 and a support member 710 arranged at intervals. The doctor blade 720 is arranged along the width direction of the substrate 100. The doctor blade 720 and the support member 710 form a coating gap 730. The substrate 100 passes through the coating gap 730. The coating droplets on the surface of the substrate 100 are coated onto the substrate 100 under the action of the doctor blade 720 to form a coating layer.

[0035] To ensure a more uniform coating coverage on the substrate 100, the support member 710 only needs to provide support along the width of the substrate 100. In this application, since the coated coating and substrate 100 need to be allowed to air dry naturally, the support member 710 includes a support plane. The width of the support plane is moderate to the width of the substrate 100. The support plane extends along the length of the substrate 100. Transition rollers 400 are provided at both ends of the support plane's length direction. The upper end of the transition rollers 400 is flush with the support plane. The bottom of the substrate 100 slides along the support plane, conforming to it. The use of transition rollers 400 reduces wear during the movement of the substrate 100. A scraper 720 is located in the middle of the support plane, and multiple discharge pipes 810 are also located above the support plane and adjacent to the scraper 720. To facilitate the positioning and installation of the scraper 720, the scraper 720 is connected to a lifting assembly to change the gap between the bottom of the scraper 720 and the support plane. Figure 2As shown, the scraper 720 is located on the lifting frame 722. The lifting frame 722 is positioned by the cable chain lifting device 723. The height adjustment control accuracy range of the cable chain lifting device 723 can be selected according to the requirements. The repeatability of lifting is usually ±1 mm, and some high-precision devices can reach ±0.5 mm. With the height design of the support platform 711, the height of the scraper 720 can be ensured to be appropriate as much as possible to ensure that the coating thickness meets the requirements.

[0036] Although the feeding method of this application results in less coating adhering to the substrate 100, it also presents the problem of coating being guided along both sides of the scraper 720 along its length. Therefore, this application provides waste liquid tanks 712 on both sides of the support plane along the width direction of the substrate 100, with the scraper 720 located within the two waste liquid tanks 712 on both sides of the scraper 720 along the width direction of the substrate 100. Figure 3 As shown, the paint flowing along the scraper 720 can enter the waste liquid tank 712 for collection. The bottom of the waste liquid tank 712 can be inclined to facilitate the discharge of paint from the waste liquid tank 712. The paint will solidify at room temperature in 2-3 hours. To avoid affecting the use of the waste liquid tank 712, it can be cleaned periodically. Correspondingly, to prevent paint adhering to the scraper 720 from affecting its use, the scraper 720 can be cleaned periodically by stopping the machine.

[0037] To facilitate the flow of coating along the length of the scraper 720, the scraper 720 of this application has an inwardly recessed arc-shaped notch 721 on the lower part near the coating droplet. The arc-shaped notch 721 extends along the length of the scraper 720 and has a structure that narrows from the middle to both ends. This structure allows the coating to be guided as much as possible along the waste liquid tank 712. The coating can be adhered to the two side walls (thickness direction side walls) of the substrate 100. In subsequent processing, a cutting process can be implemented to trim the edges of the coated substrate 100 to ensure the quality of the composite material.

[0038] The substrate 100 after coating needs to undergo curing. The post-processing unit 500 of this application is located behind the coating unit 700 and is used to cure the substrate 100 and the coating layer; for example... Figure 1 As shown, the post-processing unit 500 is an ultraviolet curing unit and / or a thermal curing unit (heat oven processing unit), which can realize the curing treatment of the coating and the substrate 100.

[0039] The winding mechanism is located behind the post-processing mechanism 500 and includes a winding roller 600. The winding roller 600 rotates to wind up the cured substrate 100 and the coating layer.

[0040] The principle of this application:

[0041] A rolled graphene conductive substrate 100 is mounted on an unwinding roller 310. An unwinding motor on the unwinding roller 310 starts and releases the substrate 100, which then passes sequentially through a tension regulating roller and a tension detection roller 330. A pressure sensor on the tension detection roller 330 receives a tension signal from the substrate 100 and adjusts the unwinding motor speed and / or the tension regulating roller position in real time, ensuring the substrate 100 travels with constant tension. The substrate 100 is then cleaned by a non-contact air knife 200 that sprays clean compressed air to remove surface dust and static electricity. The cleaned substrate 100 enters the feeding mechanism 800, where coatings are dispensed from various feeders. The material is discharged through the discharge pipe 810, forming a wet coating on the surface of the graphene substrate 100 passing below. The scraper 720 levels the wet coating, and the substrate 100 undergoes natural leveling on the support platform 711. Subsequently, the substrate 100 enters the post-processing mechanism 500 for fixing. After curing, the substrate 100 is transferred over a long distance to achieve air cooling and then winding. Alternatively, a cooling roller can be set after curing to cool the substrate using the circulating liquid inside the cooling roller. Finally, the substrate 100 reaches the winding roller 600, and the winding motor of the winding roller 600 starts to drive the winding shaft to rotate, forming a neat roll.

[0042] This device enables the continuous, uniform, and controllable coating of composite conductive coatings on the surface of graphene conductive substrate 100, solving the problems of poor coating uniformity, difficulty in thickness control, and low production efficiency.

[0043] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0044] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and 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. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0045] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. An apparatus for applying a composite conductive coating, characterized in that: It includes an unwinding mechanism (300), a feeding mechanism (800), a coating mechanism (700), a post-processing mechanism (500), and a rewinding mechanism; The unwinding mechanism (300) is used to unwind the substrate (100) in a preset direction so that it enters the feeding mechanism (800); The feeding mechanism (800) includes a plurality of discharge pipes (810) arranged along the width direction of the substrate (100), and each discharge pipe (810) discharges material simultaneously to form coating droplets on the substrate (100); The coating mechanism (700) includes a doctor blade (720) and a support member (710) arranged at intervals. The doctor blade (720) is arranged along the width direction of the substrate (100). The doctor blade (720) and the support member (710) form a coating gap (730). The substrate (100) passes through the coating gap (730). The coating droplets on the surface of the substrate (100) are coated on the substrate (100) under the action of the doctor blade (720) to form a coating layer. The post-processing unit (500) is used to cure the substrate (100) and the coating layer; The winding mechanism is located behind the post-processing mechanism (500) and is used to wind up the cured substrate (100) and coating layer.

2. The apparatus for coating a composite conductive coating according to claim 1, characterized in that: The unwinding mechanism (300) includes an unwinding roller (310), a tension adjusting wheel (320), and a tension detection roller (330) arranged in sequence. The unwinding roller (310) is used to wind the substrate (100), the tension adjusting roller is used to adjust the tension of the substrate (100), and the tension detection roller (330) is used to detect the tension of the substrate (100).

3. The apparatus for coating a composite conductive coating according to claim 1, characterized in that: A pretreatment assembly is also provided between the unwinding mechanism (300) and the feeding mechanism (800). The pretreatment assembly includes an air knife (200) arranged along the width direction of the substrate (100). The air outlet of the air knife (200) faces the surface of the substrate (100). The air knife (200) is used to spray clean compressed air.

4. The apparatus for coating a composite conductive coating according to claim 2, characterized in that: A pretreatment assembly is also provided between the unwinding mechanism (300) and the feeding mechanism (800). The pretreatment assembly includes an air knife (200) arranged along the width direction of the substrate (100). The air outlet of the air knife (200) faces the surface of the substrate (100). The air knife (200) is used to spray clean compressed air.

5. The apparatus for applying a composite conductive coating according to any one of claims 1-4, characterized in that: The support member (710) includes a support plane, and the bottom of the substrate (100) is attached to the support plane and slides along the support plane; The scraper (720) is connected to a lifting assembly for changing the gap between the bottom of the scraper (720) and the support plane.

6. The apparatus for coating a composite conductive coating according to claim 5, characterized in that: Waste liquid tanks (712) are provided on both sides of the support plane along the width direction of the substrate (100), and scrapers (720) are located in the two waste liquid tanks (712) on both sides along the width direction of the substrate (100).

7. The apparatus for applying a composite conductive coating according to claim 1, 2, 3, 4 or 6, characterized in that: The lower part of the scraper (720) near the coating droplet has an inwardly recessed arc-shaped notch (721). The arc-shaped notch (721) extends along the length of the scraper (720) and has a structure that narrows from the middle to both ends.

8. The apparatus for coating a composite conductive coating according to claim 5, characterized in that: The lower part of the scraper (720) near the coating droplet has an inwardly recessed arc-shaped notch (721). The arc-shaped notch (721) extends along the length of the scraper (720) and has a structure that narrows from the middle to both ends.

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