A coating roll scraping system

Abstract

The present invention discloses a coating roll scraping system, comprising: a workbench for supporting a substrate to be coated with a film; a coating roll rotatably arranged on the workbench, the coating roll being an elliptical coating roll, and when the major axis of the coating roll is perpendicular to the substrate to be coated with a film, the distance between the coating roll and the substrate to be coated with a film is a first distance d1, and when the minor axis of the coating roll is perpendicular to the substrate to be coated with a film, the distance between the coating roll and the substrate to be coated with a film is a second distance. In the coating roll scraping system provided by the present invention, the major axis of the coating roll can be perpendicular to the substrate to be coated with a film as the initial position, at this time the distance between the coating roll and the substrate to be coated with a film is the smallest, and as the coating roll moves forward for coating and drives the coating roll to rotate, the distance between the coating roll and the substrate to be coated with a film gradually increases, so that the film thickness at the front end of the substrate to be coated with a film is thinner, so that when the amount of solution is insufficient, the situation that the film thickness at the rear end of the substrate to be coated with a film becomes significantly thinner due to excessive consumption at the front end of the substrate to be coated with a film can be avoided, and the uniformity of the film thickness can be maintained.

Description

Technical Field

[0001] The present invention relates to the technical field of solar cell preparation, and particularly relates to a coating roll scraping system. Background Art

[0002] Coating roll scraping is a common solution film-making method, which has the characteristic of simple equipment structure and is widely used in the research field of solution-based film formation. For example, in the preparation process of perovskite solar cells, the core absorption layer perovskite film, electron transport layer, hole transport layer, and passivation layer can all be prepared by the method of coating roll scraping.

[0003] As Figure 1 shown, in the prior art, the main device for coating roll scraping is a coating roll 101 made of stainless steel with a smooth surface. The coating roll 101 is of a cylindrical structure, and the gap between the bottom of the coating roll 101 and the upper surface of the substrate to be film-coated 102 is controlled between 20 and 500 μm. As Figure 2 shown, by dropping a certain amount of solution 103 on the side surface of the coating roll 101, the solution 103 flows into the gap between the coating roll 101 and the substrate to be film-coated 102. The coating roll 101 is driven forward by a motor to drive the solution 103 to be coated forward, and finally a film is formed, as Figure 3 shown.

[0004] Due to the large initial amount of solution, when the amount of solution is insufficient, as the scraping progresses, the amount of solution decreases, resulting in the exhaustion of the solution at the back, making the thickness of the front end of the film much larger than that of the back end, that is, the film layer uniformity is poor.

[0005] Therefore, how to improve the coating film uniformity when the amount of solution is insufficient is a technical problem that those skilled in the art need to solve at present. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a coating roll scraping system to avoid the problem that the film thickness at the back end becomes significantly thinner when the amount of solution is insufficient.

[0007] To achieve the above purpose, the present invention provides the following technical solutions:

[0008] A coating roll scraping system includes:

[0009] A workbench for supporting the substrate to be film-coated;

[0010] A coating roll rotatably arranged on the workbench. The coating roll is an elliptical coating roll, and when the long axis of the coating roll is perpendicular to the substrate to be film-coated, the distance between the coating roll and the substrate to be film-coated is a first distance d1, and when the short axis of the coating roll is perpendicular to the substrate to be film-coated, the distance between the coating roll and the substrate to be film-coated is a second distance, and the first distance d1 is less than the second distance;

[0011] A coating drive device, used for driving the coating roller to move along the workbench to achieve coating of the film layer;

[0012] The spacing driving device is used to drive the coating roller to rotate so as to adjust the spacing between the coating roller and the substrate to be film-formed.

[0013] Optionally, in the above-mentioned coating roller coating system, in the process of the coating roller being driven by the coating driving device to move from the coating starting position to the coating ending position, the coating roller is driven by the spacing driving device and the rotation range is not greater than 90°.

[0014] Optionally, in the above coating roller coating system, the difference between the first spacing and the second spacing is not greater than the tolerance of the thickness of the film to be formed.

[0015] Optionally, in the above coating roller coating system, the difference between the first spacing d1 and the second spacing d1 is less than 50 microns.

[0016] Optionally, in the above coating roller coating system, the difference between the first spacing d1 and the second spacing d1 is between 5 micrometers and 15 micrometers.

[0017] Optionally, in the above-mentioned coating roller coating system, when the coating roller is at the coating starting position, the distance between the coating roller and the substrate to be filmed is a first distance d1, and when the coating roller is at the coating end position, the distance between the coating roller and the substrate to be filmed is an end distance d2, and the end distance d2 is greater than the first distance d1 and less than the second distance.

[0018] Optionally, in the above coating roller coating system, the first spacing d1, the end point spacing d2 and the second spacing are all between 20 micrometers and 500 micrometers.

[0019] Optionally, in the above coating roller coating system, a guide track is provided on the workbench, and the rotating shaft of the coating roller is supported on the guide track.

[0020] Optionally, in the above coating roller coating system, the coating drive device is a linear drive motor to drive the coating roller to move along the guide track;

[0021] The spacing driving device is a rotary driving motor that is transmission-connected to the rotating shaft of the coating roller to drive the coating roller to rotate.

[0022] Optionally, in the above coating roller doctor blade system, the coating roller is a stainless steel coating roller.

[0023] The coating roller scraping system provided by the present invention is provided with a coating roller on a workbench. When a film needs to be made, the substrate to be filmed needs to be placed on the workbench, and then a certain amount of solution is dropped on the side surface of the coating roller. The solution flows into the gap between the coating roller and the substrate to be filmed, and then the coating driving device drives the coating roller to rotate and move from one end of the substrate to be filmed to the other end, thereby spreading the solution evenly on the upper surface of the substrate to be filmed. During the movement of the coating roller, the spacing driving device drives the coating roller to rotate to adjust the spacing between the coating roller and the substrate to be filmed. Since the coating roller provided by the present invention is an elliptical coating roller, the spacing between it and the substrate to be filmed changes when the coating roller rotates. The long axis of the coating roller can be perpendicular to the substrate to be filmed as the initial position. At this time, the distance between the coating roller and the substrate to be filmed is the smallest. As the coating roller rotates, the distance between it and the substrate to be filmed gradually increases, so that the film thickness at the front end of the substrate to be filmed is thinner. When the amount of solution is insufficient, it will not cause the film thickness at the rear end of the substrate to be filmed to become significantly thinner or even zero due to excessive consumption at the front end of the substrate to be filmed, thus maintaining the uniformity of the film thickness. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0025] Figure 1 is a schematic structural diagram of a coating roller before coating in the prior art;

[0026] Figure 2 is a schematic structural diagram of a coating roller during coating in the prior art;

[0027] Figure 3 is a schematic structural diagram of a coating roller after coating in the prior art;

[0028] Figure 4 is a top view of the coating roller scraping system provided by the embodiment of the present invention;

[0029] Figure 5 is a front view of the coating roller scraping system provided by the embodiment of the present invention;

[0030] Figure 6 is a schematic structural diagram of a coating roller before coating provided by the embodiment of the present invention;

[0031] Figure 7 is a schematic structural diagram of a coating roller after coating provided by the embodiment of the present invention.

[0032] The meanings of the various reference numerals in the drawings are as follows:

[0033] 101 is a coating roller;

[0034] 102 is a substrate to be coated with a film;

[0035] 103 is a solution;

[0036] 104 is a guiding track;

[0037] 105 is a rotating shaft;

[0038] 106 is a workbench. Specific embodiments

[0039] The core of the present invention lies in providing a coating roller scraping system to avoid the problem that the film thickness at the rear end becomes significantly thinner when the amount of the solution is insufficient.

[0040] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0041] As Figures 4 - 7 shown, the embodiment of the present invention discloses a coating roller scraping system, including a workbench 106, a coating roller 101, a coating driving device, and a spacing driving device.

[0042] Among them, the workbench 106 is used to support the substrate 102 to be coated with a film. Specifically, corresponding positioning devices can be provided on the workbench 106 to position and fix the substrate 102 to be coated with a film, so as to prevent the substrate 102 to be coated with a film from moving during the film-making process.

[0043] The coating roller 101 is rotatably arranged on the workbench 106, that is, the coating roller 101 can be driven by the spacing driving device to rotate on the workbench 106. The coating roller 101 is an oval coating roller, that is, the outer surface of the coating roller 101 is oval.

[0044] When the coating roller 101 is coating, it is driven by the coating driving device to drive the coating roller 101 to move along the workbench 106. During the moving process, a certain amount of the solution dripped on the side surface of the coating roller 101 is spread flat to achieve the coating of the film layer.

[0045] As Figure 6As shown in the figure, when the long axis of the coating roller 101 is perpendicular to the substrate 102 to be coated with a film, that is, when the included angle A1 between the long axis of the coating roller 101 and the substrate 102 to be coated with a film is 90 degrees, the distance between the coating roller 101 and the substrate 102 to be coated with a film is the first distance d1, and the first distance d1 is the minimum distance between the coating roller 101 and the substrate 102 to be coated with a film. In order to prevent the film layer coated at the front end of the substrate 102 to be coated with a film from being too thick, the first distance d1 can be used as the distance between the coating roller 101 and the substrate 102 to be coated with a film at the initial coating position. That is, at the initial position, although the amount of the solution is large, too much solution will not be wasted. That is, a thinner film layer is coated at the initial position to reserve more solution for the subsequent positions. It should be noted that even the thickness at the thinnest position (the first distance d1) can meet the design requirements.

[0046] When the short axis of the coating roller 101 is perpendicular to the substrate 102 to be coated with a film, the distance between the coating roller 101 and the substrate 102 to be coated with a film is the second distance, and the first distance d1 is less than the second distance. When coating the film layer, it rotates from the state where the long axis of the coating roller 101 is perpendicular to the substrate 102 to be coated with a film to the state where the short axis of the coating roller 101 is perpendicular to the substrate 102 to be coated with a film.

[0047] In the coating roller 101 scraping system provided by the present invention, a coating roller 101 is arranged on a workbench 106. When a film needs to be made, the substrate 102 to be coated with a film needs to be placed on the workbench 106, and then a certain amount of solution is dropped on the side surface of the coating roller 101 through a coating driving device. The solution flows into the gap between the coating roller 101 and the substrate 102 to be coated with a film, and then the coating roller 101 is driven to rotate from one end of the substrate 102 to the other end, and then the solution is spread flat on the upper surface of the substrate 102 to be coated with a film. During the movement of the coating roller, a spacing driving device drives the coating roller to rotate to adjust the distance between the coating roller and the substrate to be coated with a film. Since the coating roller 101 provided by the present invention is an elliptical coating roller, when the coating roller 101 rotates, the distance between it and the substrate 102 to be coated with a film changes. The state where the long axis of the coating roller 101 is perpendicular to the substrate 102 to be coated with a film can be used as the initial position. At this time, the distance between the coating roller 101 and the substrate 102 to be coated with a film is the smallest. As the coating roller 101 rotates forward, the distance between it and the substrate 102 to be coated with a film gradually increases, so that the film thickness at the front end of the substrate 102 to be coated with a film is thinner. When the amount of the solution is insufficient, it will not cause the situation that the film thickness at the rear end of the substrate 102 to be coated with a film becomes significantly thinner or even zero due to excessive consumption at the front end of the substrate 102 to be coated with a film, and the uniformity of the film thickness is maintained.

[0048] In a specific embodiment of the present invention, during the process in which the coating roller 101 is driven by the coating driving device to move from the coating starting position to the coating ending position, the coating roller 101 is driven by the spacing driving device, and the rotation range is not greater than 90°. That is, when coating the film layer on the substrate 102 to be formed into a film, starting from the position where the long axis of the coating roller 101 is perpendicular to the substrate 102 to be formed into a film and rotating in the direction where the short axis of the coating roller 101 is perpendicular to the substrate 102 to be formed into a film, during the entire process of coating the substrate 102 to be formed into a film, the rotation range of the coating roller 101 should be less than a quarter of a circle. This enables the coating roller 101 to complete the coating work before rotating to the position where the short axis is perpendicular to the substrate 102 to be formed into a film, and makes the distance between the coating roller 101 and the substrate 102 to be formed into a film gradually increase, so as to offset the problem of the thinning of the film layer at the rear of the substrate 102 to be formed into a film due to insufficient solution volume.

[0049] Furthermore, the difference between the first spacing and the second spacing is not greater than the tolerance of the thickness of the film to be formed, that is, both the first spacing and the second spacing are within the designed dimension range of the film layer thickness, so as to avoid the problem that the film layer thickness does not meet the design requirements due to the spacing being too large or too small. For example, if the designed dimension of the film layer thickness is a and the tolerance is ±b, the first spacing can be set as a - b and the second spacing can be set as a + b.

[0050] In a specific embodiment of the present invention, the difference between the first spacing d1 and the second spacing is less than 50 microns, that is, the difference between the long axis and the short axis of the coating roller 101 is less than 100 microns. Furthermore, the difference between the first spacing d1 and the second spacing can be controlled between 5 microns and 15 microns.

[0051] As Figure 6 and Figure 7 shown, in a specific embodiment of the present invention, when the coating roller 101 is at the coating starting position, the spacing between the coating roller 101 and the substrate 102 to be formed into a film is the first spacing d1. When the coating roller 101 is at the coating ending position, the spacing between the coating roller 101 and the substrate 102 to be formed into a film is the ending spacing d2 (that is, when the angle A2 between the long axis of the coating roller 101 and the substrate 102 to be formed into a film is less than 90 degrees), the ending spacing d2 is greater than the first spacing d1 and less than the second spacing.

[0052] Furthermore, the first spacing d1, the ending spacing d2, and the second spacing are all between 20 microns and 500 microns. The specific values of the first spacing d1, the ending spacing d2, and the second spacing should be determined according to the designed thickness of the film layer.

[0053] As Figure 4 and Figure 5As shown, a guide track 104 is provided on the workbench 106, and the rotating shaft 105 of the coating roller 101 is supported on the guide track 104. The guide track 104 is used to limit the rotation direction of the coating roller 101 to prevent the coating roller 101 from deflecting during its rotation.

[0054] In this embodiment, the coating drive device is a linear drive motor to drive the coating roller 101 to move along the guide track 104; the spacing drive device is a rotary drive motor that is transmission-connected to the rotating shaft 105 of the coating roller 101 to drive the coating roller 101 to rotate. The coating roller 101 can be a stainless steel coating roller, and those skilled in the art can select the specific material of the coating roller 101 according to the needs, and is not limited to the specific material of stainless steel.

[0055] It should be noted that the various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0056] As shown in this application and claims, unless the context clearly indicates an exception, the words "a", "an", "a kind" and / or "the" do not refer to the singular, but also include the plural. Generally speaking, the terms "include" and "comprise" only indicate the inclusion of clearly identified steps and elements, and these steps and elements do not constitute an exclusive list. The method or device may also include other steps or elements. The elements defined by the sentence "includes a..." do not exclude the existence of other identical elements in the process, method, commodity or device that includes the elements.

[0057] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0058] The principles and implementation methods of the present invention are described in this article using specific examples. The description of the above embodiments is only used to help understand the core idea of ​​the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A coating roll scraping system, characterized in that, include: A workbench (106) used for supporting the substrate (102) to be film-formed; A coating roller (101) is rotatably disposed on the workbench (106), the coating roller (101) being an elliptical coating roller, and when the long axis of the coating roller (101) is perpendicular to the substrate (102) to be filmed, the spacing between the coating roller (101) and the substrate (102) to be filmed is a first spacing d1, and when the short axis of the coating roller (101) is perpendicular to the substrate (102) to be filmed, the spacing between the coating roller (101) and the substrate (102) to be filmed is a second spacing, and the first spacing d1 is smaller than the second spacing; A coating drive device, used for driving the coating roller (101) to move along the workbench (106) to achieve coating of the film layer; A spacing drive device is used to drive the coating roller (101) to rotate so as to adjust the spacing between the coating roller (101) and the substrate (102) to be filmed. When the coating roller (101) is driven by the coating drive device to move from a coating starting point to a coating end point, the coating roller (101) is driven by the spacing drive device to rotate within a range of no more than 90°, and the difference between the first spacing and the second spacing is no more than the tolerance of the thickness of the film to be formed.

2. The coating roller scraping system according to claim 1, wherein The difference between the first spacing d1 and the second spacing d1 is less than 50 micrometers.

3. The coating roll scraping system according to claim 2, characterized in that, The difference between the first spacing d1 and the second spacing d1 is between 5 micrometers and 15 micrometers.

4. The coating roll scraping system according to claim 1, wherein, When the coating roller (101) is at the coating starting position, the spacing between the coating roller (101) and the substrate (102) to be filmed is a first spacing d1; when the coating roller (101) is at the coating ending position, the spacing between the coating roller (101) and the substrate (102) to be filmed is an ending spacing d2; the ending spacing d2 is greater than the first spacing d1 and less than the second spacing.

5. The coating roll scraping system according to claim 4, characterized in that, The first spacing d1, the end spacing d2 and the second spacing are all between 20 micrometers and 500 micrometers.

6. The coating roll scraping system according to any one of claims 1-5, characterized in that, A guide track (104) is provided on the workbench (106), and a rotating shaft (105) of the coating roller (101) is supported on the guide track (104).

7. The coating roll scraping system according to claim 6, characterized in that, The coating drive device is a linear drive motor, which drives the coating roller (101) to move along the guide track (104); The spacing driving device is a rotary driving motor that is transmission-connected to the rotating shaft (105) of the coating roller (101) so as to drive the coating roller (101) to rotate.

8. The coating roll scraping system according to claim 6, wherein, The coating roller (101) is a stainless steel coating roller.

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