Slit coating machine

Abstract

The utility model belongs to the technical field of slit coating devices, and particularly relates to a slit coating machine. According to the slit coating die head, the backflow assembly used for enabling the slurry at the slit coating outlet to flow back to the material carrying cavity is arranged on the slit coating die head, after the coating die head stops or interrupts coating, materials with the short window period cannot excessively stay and solidify in the internal coating die head, blockage at the outlet of the die head is avoided, and the service life of the coating die head is prolonged. And the slurry flows back to the homogenate supply device through the backflow assembly instead of flowing back to the homogenate supply device, so that the problem that slurry blockage is formed in the slit coating die head after the coating die head stops or interrupts coating under the condition of unidirectional discharging of the existing slit coating die head is effectively solved.

Description

Technical Field

[0001] This application belongs to the technical field of slot coating devices, specifically relating to a slot coating machine. Background Technology

[0002] A slot coater is a precision device specifically designed for uniformly coating substrate materials. It is widely used in the manufacturing processes of high-tech products such as perovskite solar cells and lithium battery electrode pastes. Its core components mainly include a slot coater die, a coating trajectory limiter, and a paste supply device.

[0003] The slot coater, a key component of the equipment, features a complex and precise internal flow channel and an extremely narrow slurry outlet slit to ensure uniform application of the slurry to the substrate. The coating trajectory limiter guides and controls the slurry flow path on the substrate surface, ensuring high precision and consistency in each coating process. The slurry supply unit mixes the slurry raw materials and supplies them to the slot coater. In operation, the slurry delivered by the slurry supply unit is uniformly coated onto the substrate material through the flow channels and slurry outlet slit of the slot coater.

[0004] However, using a slot coater for materials with short coating windows presents a series of challenges. Although the slurry remains physically stable in the slurry supply unit, sedimentation or clumping can still occur during delivery to the die. These issues lead to uneven coating and consequently affect product quality. In particular, when the slot coater's die stops or interrupts coating, high-viscosity, easily solidified, or temperature-sensitive slurries can rapidly crystallize, causing blockages at the die exit and forming particulate impurities inside the die. This not only necessitates frequent die cleaning by operators, increasing maintenance costs and downtime, but can also reduce production efficiency and product quality. Utility Model Content

[0005] To solve the above-mentioned technical problems, this application provides a slot coating machine, which is achieved through the following technical solution:

[0006] A slot coating machine includes a slot coating die and a slurry supply device; the slurry supply device includes a material loading chamber, a stirring assembly disposed inside the material loading chamber, and a heating assembly disposed outside the material loading chamber; the slot coating die includes an inlet communicating with the outlet of the slurry supply device and a slot coating outlet communicating with the inlet; the slot coating die further includes a reflux assembly for returning the slurry at the slot coating outlet to the material loading chamber.

[0007] Preferably, the homogenizing supply device is further provided with a temperature detection component for detecting the temperature of the material inside the loading chamber.

[0008] Preferably, the slot coating machine further includes a control device, which is connected to the temperature detection component and the heating component.

[0009] Preferably, the discharge port is located at the lower end of the homogenizing supply device; the reflux component is connected to the upper end of the homogenizing supply device.

[0010] Preferably, the temperature detection component is used to detect the temperature at the outlet location.

[0011] Preferably, the slurry supply device includes a first slurry material layer for forming the material loading chamber and a second slurry material layer covering the outside of the first slurry material layer; a hollow chamber is formed between the first slurry material layer and the second slurry material layer.

[0012] Preferably, the heating component is disposed in the hollow cavity and coiled around the outer periphery of the first homogenized material layer.

[0013] Preferably, the stirring assembly includes a magnetic stirring assembly that uses magnetic force for stirring.

[0014] Preferably, the control device is connected to the recirculation assembly.

[0015] Preferably, a slurry injector is also provided between the slurry supply device and the feed inlet.

[0016] Compared with the prior art, this application has the following beneficial effects:

[0017] This application provides a reflux component on the slit coating die to return the slurry at the slit coating outlet to the material loading chamber. When the coating die stops or interrupts coating, the material with a short window period will not remain and solidify excessively inside the coating die, causing blockage at the die outlet. Instead, it will flow back to the homogenizing supply device through the reflux component. Therefore, this effectively solves the problem of slurry blockage inside the slit coating die after the coating die stops or interrupts coating in the current unidirectional discharge case.

[0018] This application sets up a temperature detection component for detecting the temperature of the material inside the loading chamber, and connects the temperature detection component and the heating component with a control device. This allows the temperature of the material inside the loading chamber to be controlled within a suitable range, so that the slurry entering the slit coating die can maintain a relatively stable state, ultimately achieving uniform coating of the slurry.

[0019] This application, by establishing a connection between the reflux component and the homogenizing supply device, and by designing the position of the outlet on the homogenizing supply device, can prevent the cooled slurry flowing out of the slot coating outlet from flowing back to the homogenizing supply device and being directly transported to the slot coating die head, thus avoiding uneven temperature and unstable slurry state during the transportation process.

[0020] The homogenizing material supply device of this application forms a hollow cavity between the first homogenizing material layer and a second homogenizing material layer covering the outside of the first homogenizing material layer, and a heating component is arranged around the outer periphery of the first homogenizing material layer in the hollow cavity, thus improving the heating and heat preservation effect of the homogenizing material supply device.

[0021] This application connects the control device to the reflux assembly, allowing the slit coater to return the slurry from the slit coater outlet to the homogenizing supply device after the coating process is stopped or interrupted. Alternatively, in coating processes with low slurry requirements, high-flow-rate coating can be used, and the reflux assembly can be employed to return some excess slurry to the homogenizing supply device, thus solving the slurry blockage problem that easily occurs with low slurry requirements. Attached Figure Description

[0022] To clearly illustrate the embodiments, the accompanying drawings will be briefly described below:

[0023] Figure 1 This is a partial structural schematic diagram of the slot coating machine of this application;

[0024] Figure 2 This is a schematic diagram of the slit coating machine with a control device connected to the present application.

[0025] Reference numerals: 100, slot coating die head; 110, inlet; 120, slot coating outlet; 130, reflux assembly; 200, slurry supply device; 210, material loading chamber; 220, heating assembly; 230, outlet; 240, temperature detection assembly; 250, first slurry material layer; 260, second slurry material layer; 270, hollow chamber; 300, control device; 400, slurry injector. Detailed Implementation

[0026] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Those skilled in the art will be able to implement the present invention based on these descriptions. Furthermore, the embodiments of the present invention described below are generally only a part of the embodiments of the present invention, and not all of the embodiments. Therefore, all other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0027] Please see the appendix Figure 1 This embodiment provides a slit coating machine, including a slit coating die head 100, a slurry supply device 200, and a control device 300.

[0028] The homogenizing supply device 200 includes a material-carrying chamber 210, a stirring assembly disposed inside the material-carrying chamber 210, and a heating assembly 220 disposed outside the material-carrying chamber 210. Specifically, in this embodiment, the homogenizing supply device 200 includes a first homogenizing material layer 250 for forming the material-carrying chamber 210 and a second homogenizing material layer 260 covering the outside of the first homogenizing material layer 250; a hollow chamber 270 is formed between the first homogenizing material layer 250 and the second homogenizing material layer 260. The heating assembly 220 is disposed in the hollow chamber 270 and is coiled around the outer periphery of the first homogenizing material layer 250. With this arrangement, the heating and heat preservation effect of the homogenizing supply device 200 is better. Further, the first homogenizing material layer 250 is made of corrosion-resistant material, and the second homogenizing material layer 260 is made of heat-insulating material. The homogenizing supply device 200 is also provided with a temperature detection assembly 240 for detecting the temperature of the material inside the material-carrying chamber 210. Furthermore, the temperature detection component 240 is used to detect the temperature at the outlet 230. To ensure the mixing effect, in this embodiment, the mixing component includes both a mechanical mixing component and a magnetic mixing component.

[0029] The slit coating die 100 includes an inlet 110 that is connected to the outlet 230 of the slurry supply device 200, and a slit coating outlet 120 that is connected to the inlet 110. Further, in this embodiment, to ensure that the slurry flows smoothly out of the narrow slit coating outlet 120, a slurry injector 400 is also provided between the slurry supply device 200 and the inlet 110. The slit coating die 100 also includes a return assembly 130 for returning the slurry at the slit coating outlet 120 to the material loading chamber 210. To prevent the cooled slurry flowing from the slot coating outlet from flowing back into the homogenizing supply device 200 and being directly conveyed into the slot coating die head 100, which could lead to uneven temperature and unstable slurry conditions during conveying, in this embodiment, the outlet 230 of the homogenizing supply device 200 is located at the lower end of the homogenizing supply device 200; the reflux assembly 130 is connected to the upper end of the homogenizing supply device 200. The outlet 230 of the homogenizing supply device 200 is equipped with a discharge valve. Furthermore, in this embodiment, the control device 300 is connected to the reflux assembly 130, the temperature detection assembly 240, and the heating assembly 220.

[0030] This embodiment also discloses the coating process of the slot coater, specifically including the following steps: The mixing component of the slurry supply device 200 is turned on to mix the slurry inside the material loading chamber 210; the heating component 220 is turned on to heat the slurry inside the material loading chamber 210; the temperature detection component 240 detects the temperature of the slurry and uploads the temperature information to the control device 300; when the temperature reaches the coating standard, the discharge valve is opened to deliver the slurry to the slurry injector 400. Then, the slurry injector 400 injects the slurry into the slot coater die 100, the slurry flows through the internal flow channel of the slot coater die 100, and finally flows out from the slot coater outlet 120. When the slit coater interrupts coating, the control device 300 activates the reflux assembly 130 to return the slurry to the homogenizing supply device 200. This allows the slurry to circulate between the slit coater die 100 and the homogenizing supply device 200, preventing crystallization inside the slit coater die 100 and blockage at the slit coater outlet 120. Furthermore, if the coated slurry is uneven, the control device 300 can drive the heating assembly 220 to heat the slurry, reducing sedimentation and other phenomena that occur during the slurry's transport within the coater, thereby ensuring coating quality.

Claims

1. A slot coating machine, comprising a slot coating die (100) and a slurry supply device (200); the slurry supply device (200) comprises a material loading chamber (210), a stirring assembly disposed inside the material loading chamber (210), and a heating assembly (220) disposed outside the material loading chamber (210); the slot coating die (100) comprises an inlet (110) communicating with the outlet (230) of the slurry supply device (200), and a slot coating outlet (120) communicating with the inlet (110); characterized in that, The slit coating die (100) also includes a reflux assembly (130) for refluxing the slurry at the slit coating outlet (120) back to the material loading chamber (210).

2. The slot coating machine according to claim 1, characterized in that, The homogenizing supply device (200) is also provided with a temperature detection component (240) for detecting the temperature of the material inside the material loading chamber (210).

3. A slot coating machine according to claim 2, characterized in that, The slot coating machine also includes a control device (300), which is connected to the temperature detection component (240) and the heating component (220).

4. A slot coating machine according to claim 2, characterized in that, The discharge port (230) is located at the lower end of the homogenizing supply device (200); the reflux component (130) is connected to the upper end of the homogenizing supply device (200).

5. A slot coating machine according to claim 4, characterized in that, The temperature detection component (240) is used to detect the temperature at the outlet (230).

6. A slot coating machine according to claim 1, characterized in that, The homogenizing supply device (200) includes a first homogenizing material layer (250) for forming the material loading chamber (210) and a second homogenizing material layer (260) covering the outside of the first homogenizing material layer (250); a hollow chamber (270) is formed between the first homogenizing material layer (250) and the second homogenizing material layer (260).

7. A slot coating machine according to claim 6, characterized in that, The heating component (220) is disposed in the hollow cavity (270) and is coiled around the outer periphery of the first homogenized material layer (250).

8. A slot coating machine according to claim 1, characterized in that, The stirring assembly includes a magnetic stirring assembly that uses magnetic force for stirring.

9. A slot coating machine according to claim 3, characterized in that, The control device (300) is connected to the recirculation assembly (130).

10. A slot coating machine according to claim 1, characterized in that, A slurry injector (400) is also provided between the slurry supply device (200) and the feed inlet (110).

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