Thin film microgroove coating device

Abstract

The utility model discloses a thin film microgroove coating device, comprising a coating platform and a coating component arranged above the coating platform, as well as a first driving mechanism and a second driving mechanism; the coating component comprises a coating scraper, the coating scraper has a coating cavity, and the coating cavity is connected to a liquid supply mechanism; the coating cavity has an opening at the lower end, and a scraping portion is arranged in the circumference of the opening; during coating, the film is pressed tightly on the coating platform, the first driving mechanism drives the coating scraper to move downward until the scraping portion presses against the film, and then the second driving mechanism drives the coating scraper to move in a direction opposite to the film conveying direction, and the scraping portion scrapes the solution into the groove on the surface of the film, and scrapes off the solution in the area outside the groove; after coating, the scraping portion presses against the film and moves synchronously with the film along the film conveying direction until the coating scraper returns to the initial position to coat the next film, and the scraping portion is always pressed on the film during the whole process to prevent the solution from leaking, thereby achieving the purpose of step-by-step coating of the film.

Description

Technical Field

[0001] The utility model belongs to the technical field of film production and manufacturing, and specifically relates to a film micro-groove coating device. Background Art

[0002] As an electrode preparation technology for photovoltaic cells, laser transfer technology has become a very promising printing method in the industry due to its advantages of non-contact printing and the ability to prepare grid lines with good aspect ratios.

[0003] The source substrate of laser transfer is usually a film. When the film is used in the topcon battery route, the silver paste cannot fall off during transfer due to the strong adhesion of the high-temperature paste itself. Based on the problem of the silver paste not falling off, a layer of infrared laser absorber (hereinafter referred to as solution) needs to be coated in the groove of the film to accelerate the shedding of the silver paste in the subsequent transfer process.

[0004] Existing coating methods mainly use roller coating or slot extrusion coating, which is basically limited to the coating of flat products. When there are micron-sized grooves on the surface of the film, the existing coating methods cannot achieve the purpose of coating the solution only in the grooves while leaving no solution outside the grooves. Utility Model Content

[0005] In view of one or more of the above defects or improvement needs of the prior art, the utility model provides a thin film micro-groove coating device, so that the grooves of the film are coated with a solution while the areas outside the grooves are free of the solution.

[0006] To achieve the above object, the utility model provides a thin film microgroove coating device, which comprises:

[0007] A coating platform and a coating assembly disposed above the coating platform;

[0008] The coating assembly includes a coating scraper, the coating scraper has a coating cavity, and the coating cavity is connected to a liquid supply mechanism;

[0009] The coating cavity has an opening at the lower end, and a scraping portion is provided around the opening, the scraping portion protrudes from the end surface of the opening, and the scraping portion is made of silicone material;

[0010] A first driving mechanism, the first driving mechanism is connected to the coating scraper and is used to drive the coating scraper to rise and fall vertically;

[0011] a second driving mechanism, the second driving mechanism driving the first driving mechanism and the coating scraper to move back and forth simultaneously along the conveying direction of the film;

[0012] During coating, the film is pressed tightly against the coating platform, the first driving mechanism drives the coating scraper to move downward until the coating portion is pressed against the film, and then the second driving mechanism drives the coating scraper to move in the direction opposite to the film conveying direction, and the solution provided by the liquid supply mechanism is scraped into the grooves on the film surface through the coating portion, and the solution in the area outside the grooves is scraped off;

[0013] After coating, the coating portion is pressed against the film and moves synchronously with the film along the conveying direction of the film until the coating scraper returns to the initial position.

[0014] As a preferred embodiment of the utility model, the coating chamber includes a first scraper chamber and a second scraper chamber, the liquid supply mechanism is connected to the first scraper chamber, and the first scraper chamber is connected to the second scraper chamber, a sealing gasket is provided at the connection between the first scraper chamber and the second scraper chamber, and the opening is provided on the side of the second scraper chamber away from the first scraper chamber.

[0015] As a preferred embodiment of the utility model, an annular mounting groove is provided on the outer periphery of the opening, and the scraping portion is embedded in the annular mounting groove.

[0016] As a preferred embodiment of the utility model, the coating chamber is also connected to a liquid return mechanism and a liquid level sensor, and the sensing end of the liquid level sensor is located in the coating chamber.

[0017] As a preferred embodiment of the utility model, the coating assembly further includes a mounting bracket, the coating scraper is arranged on the mounting bracket, and the mounting bracket is also provided with a wind shear nozzle.

[0018] As a preferred embodiment of the utility model, an adsorption chamber is provided in the coating platform, the adsorption chamber is connected to the vacuum pumping component, a plurality of adsorption holes are opened on the upper surface of the coating platform, and the plurality of adsorption holes are connected to the adsorption chamber.

[0019] As a preferred embodiment of the utility model, gauze is also provided on the upper surface of the coating platform.

[0020] As a preferred embodiment of the utility model, it also includes a support frame, the coating platform is arranged on the support frame, and film pressing mechanisms are provided at both ends of the support frame along the conveying direction of the film. The two film pressing mechanisms are both located above the coating platform, and the two film pressing mechanisms can be lifted and lowered vertically.

[0021] As a preferred embodiment of the present utility model, the sealing gasket is made of silicone material.

[0022] The above-mentioned improved technical features can be combined with each other as long as they do not conflict with each other.

[0023] In general, compared with the prior art, the above technical solution conceived by the utility model has the following beneficial effects: during coating, the film is pressed tightly against the coating platform, the scraping part is pressed tightly against the upper surface of the film, and then the scraping part is driven by the second driving mechanism to move in the direction opposite to the film conveying direction, so that the solution dripped on the upper surface of the film by the liquid supply mechanism is scraped into the groove on the upper surface of the film by the scraping part, and the solution in the area outside the groove is scraped off. When the film is coated, the scraping part and the film move synchronously along the conveying direction of the film, so that the coating scraper returns to the initial position, and then the above steps are repeated to coat the next film. During the whole process, the scraping part is always pressed against the film to prevent the solution from leaking, so as to achieve the purpose of step-by-step coating of the film. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the overall structure of the thin film microgroove coating device in the embodiment of the utility model;

[0025] Figure 2 This is a schematic diagram of the overall structure of the coating scraper in the embodiment of the utility model;

[0026] Figure 3 It is a schematic diagram of the cross-sectional structure of the coating scraper in the embodiment of the utility model;

[0027] Figure 4 It is a schematic diagram of the structure of the scraping part abutting against the film surface in an embodiment of the utility model.

[0028] In all the drawings, the same reference numerals represent the same technical features, specifically:

[0029] 1. Coating platform; 2. Coating scraper; 3. Second driving mechanism; 4. First driving mechanism; 5. Wind cutting nozzle; 6. Film pressing mechanism; 7. Film;

[0030] 201, first scraper cavity; 202, second scraper cavity; 203, sealing pad; 204, scraping part; 205, liquid supply mechanism; 206, liquid return mechanism; 207, liquid level sensor; 208, fixing block. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model. In addition, the technical features involved in each embodiment of the utility model described below can be combined with each other as long as they do not conflict with each other.

[0032] In the description of the present invention, it should be understood that, unless otherwise specified, terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", and "circumferential" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0033] In addition, unless otherwise specified, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present utility model, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0034] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0036] Example:

[0037] See also Figures 1 to 4The thin film microgroove coating device in the preferred embodiment of the utility model includes a coating platform 1 and a coating assembly arranged above the coating platform 1; the coating assembly includes a coating scraper 2, the coating scraper 2 has a coating cavity, and the coating cavity is connected to a liquid supply mechanism 205; the lower end of the coating cavity has an opening, and a scraping portion 204 is arranged in the circumference of the opening, the scraping portion 204 protrudes from the end surface of the opening, and the scraping portion 204 is made of silicone material; and a first driving mechanism 4, the first driving mechanism 4 is connected to the coating scraper 2, and is used to drive the coating scraper 2 to rise and fall vertically; and a second driving mechanism 3, the second driving mechanism 3 drives the first driving mechanism 4 and the coating scraper 2 to move back and forth along the conveying direction of the film 7 at the same time;

[0038] During coating, the film 7 is pressed tightly against the coating platform 1, the first driving mechanism 4 drives the coating scraper 2 to move downward until the coating portion 204 presses against the film 7, and then the second driving mechanism 3 drives the coating scraper 2 to move in the direction opposite to the conveying direction of the film 7, and the solution provided by the liquid supply mechanism 205 is scraped into the grooves on the surface of the film 7 through the coating portion 204, and the solution in the area outside the grooves is scraped off;

[0039] After coating, the scraping portion 204 is pressed against the film 7 and moves synchronously with the film 7 along the conveying direction of the film 7 until the coating scraper 2 returns to the initial position.

[0040] The initial position here refers to Figure 1 The coating blade 2 is shown in its position.

[0041] In this embodiment, the incoming material of the film 7 to be coated is a roll material, and one roll of film contains multiple sheets of film 7 to be coated. In this embodiment, the multiple sheets of film 7 to be coated in the roll of film 7 are coated one by one in a step-by-step manner.

[0042] During the coating process, the coiled film is discharged through the discharge mechanism. A front film pulling mechanism is arranged on the side of the coating platform 1 away from the discharge mechanism. Under the action of the front film pulling mechanism, the film 7 released by the discharge mechanism is continuously transferred to the coating platform 1. When a piece of film 7 to be coated is transferred to the coating platform 1, the film 7 is pressed against the coating platform 1, and then the first driving mechanism 4 drives the coating scraper 2 to move downward until the scraping part 204 presses against the upper surface of the film 7 (such as Figure 4 As shown in the figure, a sealed cavity is formed between the coating cavity and the film 7, and then the solution is provided to the surface of the film 7 in the sealed cavity by the liquid supply mechanism 205, and then the second driving mechanism 3 drives the coating scraper 2 to move in the direction opposite to the conveying direction of the film 7, so that the scraping part 204 moves from one end of the surface of the film 7 to the other end, scraping the solution into the groove on the surface of the film 7 while scraping off the solution in the area outside the groove;

[0043] After the film 7 is coated, the film 7 is no longer pressed against the coating platform 1, and the scraping part 204 is still pressed against the surface of the film 7. The second driving mechanism 3 and the front-end film pulling mechanism move synchronously, so that the scraping part 204 and the film 7 move synchronously along the conveying direction of the film 7 until the coating component 2 returns to the initial position. At this time, the coated film 7 is also conveyed out of the coating platform 1, and the next film 7 to be coated adjacent to it is conveyed to the coating platform 1, and then the above process is repeated to coat the next film 7 until the grooves of the multiple films 7 in a roll of film are all coated with solution.

[0044] In the process of coating the grooves of multiple films 7 in a roll of film, the scraping part 204 is always pressed on the surface of the film 7 to prevent the solution from leaking, thereby achieving the purpose of step-by-step coating of the grooves on the surface of the film 7.

[0045] The scraping part 204 of this embodiment is made of silicone material. Preferably, the scraping part 204 is a silicone sealing ring. The scraping part 204 is pressed tightly against the surface of the film 7 to form a sealed cavity between the coating cavity and the film 7. While the solution is scraped into the groove, the solution in the area outside the groove is scraped off, which has a good coating effect and will not damage the film 7 during the coating process.

[0046] like Figure 1 As shown, the coating assembly of this embodiment further includes a mounting bracket, the coating scraper 2 is mounted on the mounting bracket, and the first driving mechanism 4 can be a cylinder, which is mounted on the mounting bracket, and the power output end of the cylinder is connected to the coating scraper 2 to drive the coating scraper 2 to move up and down. Of course, the first driving mechanism 4 can also be other driving methods, as long as it can drive the coating scraper 2 to move up and down.

[0047] The second driving mechanism 3 is a driving structure of a driving motor combined with a synchronous belt. Its specific structure is the prior art and is not described in detail here. Usually, the power output end of the second driving mechanism 3 is connected to the mounting bracket, and the second driving mechanism 3 drives the mounting bracket to reciprocate along the conveying direction of the film 7, thereby driving the first driving mechanism 4 and the coating scraper 2 installed on the mounting bracket to reciprocate along the conveying direction of the film 7.

[0048] Regarding the method of pressing the film 7 to be coated onto the coating platform 1, the present application sets an adsorption chamber inside the coating platform 1, and the adsorption chamber is connected to a vacuum pumping component (not shown in the figure). A plurality of adsorption holes are opened on the upper surface of the coating platform 1, and all the adsorption holes are connected to the adsorption chamber, so that the adsorption chamber is evacuated by the vacuum pumping component, and the film 7 to be coated is adsorbed onto the coating platform 1 through the adsorption holes, so as to avoid displacement of the film 7 and damage to the film 7 during the coating process.

[0049] For further information, please refer to Figure 1 The thin film microgroove coating device of this embodiment further includes a support frame, and along the conveying direction of the thin film 7, both ends of the support frame are provided with a film pressing mechanism 6, and the two film pressing mechanisms 6 are both located above the coating platform 1, and the two film pressing mechanisms 6 can move up and down, and the mounting bracket is also installed on the support frame. Specifically, the two film pressing mechanisms 6 are connected to a lifting drive structure, and are driven to move up and down by the corresponding lifting drive structure.

[0050] When the film 7 reaches the preset position on the coating platform 1, the two film pressing mechanisms 6 move downward to press both sides of the film 7 onto the coating platform 1, and then the vacuum assembly is started to adsorb the film 7 onto the coating platform 1, or the film 7 is adsorbed onto the coating platform 1 and then the two film pressing mechanisms 6 move downward to press both sides of the film 7 onto the coating platform 1. During the coating process of the film 7, the film 7 is always adsorbed onto the coating platform 1, and the two film pressing mechanisms 6 are always pressed onto the film 7, so that the film 7 can be better pressed onto the coating platform 1, so that the coating effect of the film 7 is better. When the film 7 is coated, the vacuum assembly is closed, and the two film pressing mechanisms 6 move upward to leave the film 7, so that the coated film 7 can be conveyed out of the coating platform 1.

[0051] Furthermore, if Figure 3 As shown, as a preferred embodiment of the utility model, the coating chamber of this embodiment includes a first scraper chamber 201 and a second scraper chamber 202, the liquid supply mechanism 205 is connected to the first scraper chamber 201, the first scraper chamber 201 is connected to the second scraper chamber 202, a sealing gasket 203 is provided at the connection between the first scraper chamber 201 and the second scraper chamber 202, and the opening of the coating chamber is arranged on the side of the second scraper chamber 202 away from the first scraper chamber 201.

[0052] During coating, the solution is provided to the first scraper cavity 201 and the second scraper cavity 202 through the liquid supply mechanism 205, so that a certain amount of solution is stored in the first scraper cavity 201 and the second scraper cavity 202. In addition, the first scraper cavity 201 and the second scraper cavity 202 are detachably connected together. When the width of the film 7 to be coated needs to be changed, only the second scraper cavity 202 and the scraping part 204 need to be replaced, without replacing the entire coating cavity.

[0053] The connection between the first scraper cavity 201 and the second scraper cavity 202 is provided with a sealing gasket 203 to prevent the solution from leaking from the connection. The sealing gasket 203 is preferably a silicone sealing gasket.

[0054] Furthermore, an annular mounting groove is provided on the outer periphery of the opening, and the scraping portion 204 is embedded in the annular mounting groove so that the scraping portion 204 can be fixedly installed around the opening. It can be understood that during the coating process, only the scraping portion 204 of the entire coating scraper 2 is in contact with the surface of the film 7.

[0055] Furthermore, if Figure 3 As shown, as a preferred embodiment of the present utility model, the coating chamber in the present application is also connected with a liquid return mechanism 206 and a liquid level sensor 207, and the sensing end of the liquid level sensor 207 is located in the coating chamber.

[0056] When the coating of multiple films 7 in a roll of film is completed or the coating blade 2 needs to be replaced, the solution in the coating chamber is extracted through the liquid return mechanism 206 to prevent the solution from leaking from the opening after the coating blade 2 is lifted up and separated from the film 7. Specifically, the liquid return mechanism 206 is connected to a liquid storage tank (not shown in the figure), and the solution in the coating chamber is transferred to the liquid storage tank through the liquid return mechanism 206 for storage.

[0057] Preferably, the liquid supply mechanism 205 and the liquid return mechanism 206 share a solution pump (not shown in the figure). When the solution needs to be injected into the coating chamber, the solution in the liquid storage tank is transferred to the coating chamber through the solution pump. When the solution in the coating chamber needs to be transferred to the liquid storage tank, the solution pump is reversed so that the solution in the coating chamber is transferred to the liquid storage tank through the liquid return mechanism 206.

[0058] In this embodiment, a liquid level sensor 207 is provided to monitor the liquid level of the solution in the coating chamber. When the solution is insufficient, the solution is injected into the coating chamber so that the coating chamber is always maintained at a certain liquid level line to ensure that coating can proceed normally.

[0059] Specifically, refer to Figure 2-3 The liquid supply mechanism 205, the liquid return mechanism 206 and the liquid level sensor 207 are all fixedly mounted on the first scraper cavity 201. Preferably, the liquid level sensor 207 is fixedly mounted on the first scraper cavity 201 through a fixing block 208.

[0060] like Figure 1 As shown, the mounting bracket of this embodiment is also equipped with a wind shear nozzle 5. After a piece of film 7 is coated, clean air is blown toward the surface of the film 7 through the wind shear nozzle 5, so that the solution coated in the groove can evaporate and dry quickly.

[0061] Furthermore, in the present application, a gauze is also provided on the surface of the coating platform 1. The thickness of the gauze is very thin, and the specific thickness is not specifically limited in the present application, as long as it does not affect the adsorption of the film 7. The provision of the gauze can prevent the film 7 from directly contacting the coating platform 1 and damaging the film 7.

[0062] It is easy for those skilled in the art to understand that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A thin film microgroove coating device, characterized in that: include: A coating platform and a coating assembly disposed above the coating platform; The coating assembly includes a coating scraper, the coating scraper has a coating cavity, and the coating cavity is connected to a liquid supply mechanism; The coating cavity has an opening at the lower end, and a scraping portion is provided around the opening, the scraping portion protrudes from the end surface of the opening, and the scraping portion is made of silicone material; A first driving mechanism, the first driving mechanism is connected to the coating scraper and is used to drive the coating scraper to rise and fall vertically; a second driving mechanism, the second driving mechanism driving the first driving mechanism and the coating scraper to move back and forth simultaneously along the conveying direction of the film; During coating, the film is pressed tightly against the coating platform, the first driving mechanism drives the coating scraper to move downward until the coating portion is pressed against the film, and then the second driving mechanism drives the coating scraper to move in the direction opposite to the film conveying direction, and the solution provided by the liquid supply mechanism is scraped into the grooves on the film surface through the coating portion, and the solution in the area outside the grooves is scraped off; After coating, the coating portion is pressed against the film and moves synchronously with the film along the conveying direction of the film until the coating scraper returns to the initial position.

2. The thin film microgroove coating device according to claim 1, characterized in that: The coating chamber includes a first scraper chamber and a second scraper chamber, the liquid supply mechanism is connected to the first scraper chamber, and the first scraper chamber is connected to the second scraper chamber, a sealing gasket is provided at the connection between the first scraper chamber and the second scraper chamber, and the opening is provided on the side of the second scraper chamber away from the first scraper chamber.

3. The thin film microgroove coating device according to claim 2, characterized in that: An annular mounting groove is arranged on the outer periphery of the opening, and the scraping portion is embedded in the annular mounting groove.

4. The thin film microgroove coating device according to any one of claims 1 to 3, characterized in that: The coating chamber is also connected with a liquid return mechanism and a liquid level sensor, and the sensing end of the liquid level sensor is located in the coating chamber.

5. The thin film microgroove coating device according to any one of claims 1 to 3, characterized in that: The coating assembly also includes a mounting bracket, the coating scraper is arranged on the mounting bracket, and the mounting bracket is also provided with a wind shear nozzle.

6. The thin film microgroove coating device according to any one of claims 1 to 3, characterized in that: An adsorption chamber is arranged in the coating platform, and the adsorption chamber is communicated with a vacuum pumping component. A plurality of adsorption holes are opened on the upper surface of the coating platform, and the plurality of adsorption holes are communicated with the adsorption chamber.

7. The thin film microgroove coating device according to claim 6, characterized in that: The upper surface of the coating platform is also provided with gauze.

8. The thin film microgroove coating device according to claim 6, characterized in that: It also includes a support frame, the coating platform is arranged on the support frame, and along the conveying direction of the film, both ends of the support frame are provided with film pressing mechanisms, the two film pressing mechanisms are both located above the coating platform, and the two film pressing mechanisms can be lifted and lowered vertically.

9. The thin film microgroove coating device according to claim 2 or 3, characterized in that: The sealing pad is made of silicone material.

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