Screen printing plate structure for glue film printing
By setting vertical mesh units and edge yarns in the screen structure, combined with composite mesh units, the problems of glue overflow and clogging at the screen edges are solved, thereby improving printing quality and extending screen life.
Patent Information
- Application Number
- CN202520695202.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-14
- Publication Date
- 2026-02-17
- Estimated Expiration
- 2035-04-14
AI Technical Summary
In the heterojunction cell-copper interconnect workshop, the traditional screen structure leads to irregular film edges and process adhesive overflow, affecting printing uniformity and missing grid lines in the finished cell. Existing methods increase the viscosity of the process adhesive, resulting in poor flowability, mesh clogging, and affecting printing quality.
The first and second mesh units are arranged vertically, with additional yarn at the edges, and a composite mesh unit is set at the connection of the mesh units to improve mesh tension, avoid glue overflow and mesh blockage, and improve printing uniformity.
It effectively suppresses adhesive overflow at the edges of the screen frame, ensures uniform adhesive film thickness, and improves printing quality and screen consumable life.
Smart Images
Figure CN223918935U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of battery piece printing, and particularly relates to a screen printing structure for film printing. BACKGROUND
[0002] In a heterojunction battery-copper interconnection workshop, a coating-printing-development "patterning" process needs to be performed on a battery piece under preparation before an electroplating process. In the coating process, related equipment of a traditional silver grid battery is used, such as a screen printing required screen material. The screen material is usually composed of a screen frame, screen gauze, photosensitive glue or a PI film (Polyimide Film). Due to the difference between the coating process and the screen printing process, when the screen material is only provided with screen gauze without a PI film with a specific pattern, some problems will occur in the subsequent printing process. For example, due to the influence of the screen gauze weaving structure, irregular shapes will appear at the edges of the film. In addition, due to the low mesh number of the screen, too much process glue will flow to the edge position during the printing of the film and cannot be completely recovered, resulting in abnormal thickening of the film at the edge of the battery piece. Therefore, the groove cannot be effectively opened in the subsequent process, and the grid line at the position of the finished battery is missing.
[0003] In the related art, the process glue is not easy to overflow at the frame position by increasing the viscosity of the process glue. However, this method has certain limitations. Due to the increase in the viscosity of the process glue, the flowability of the glue will be poor, so that the screen holes cannot be smoothly filled when passing through the screen holes, resulting in the blockage of part of the screen holes, affecting the uniformity of printing, and causing the surface flatness of the printed film to be poor, further affecting the printing quality. CONTENT OF THE UTILITY MODEL
[0004] The application provides a screen printing structure for film printing, which can avoid the thickening of the film caused by the overflow of the glue at the edge of the screen frame during printing, and ensures the printing quality.
[0005] In order to solve the above technical problems, the application provides a screen printing structure for film printing, which comprises a screen frame, and a first screen gauze unit and a second screen gauze unit which are arranged in the screen frame in a cross manner.
[0006] The first screen gauze unit comprises a plurality of first sub-screen gauzes arranged in the screen frame in a first direction, and the second screen gauze unit comprises a plurality of second sub-screen gauzes arranged in the screen frame in a second direction.
[0007] Among them, the plurality of first sub-screen gauzes and the plurality of second screen gauzes are perpendicular to the corresponding edges of the screen frame.
[0008] As a further improvement of the application, a plurality of first yarns are arranged in a first direction between at least two adjacent first sub-screen gauzes close to the edges of the screen frame.
[0009] As a further improvement of the present application, a plurality of second yarns are arranged between at least two adjacent second sub-mesh wires close to the edge of the mesh frame in the second direction.
[0010] As a further improvement of the present application, the number of the first yarns and the second yarns is 1-10.
[0011] As a further improvement of the present application, the plurality of first yarns and the second yarns are arranged at a position 200-400 microns away from the edge of the mesh frame.
[0012] As a further improvement of the present application, the plurality of first sub-mesh wires and the plurality of second sub-mesh wires are arranged at equal intervals inside the mesh frame.
[0013] As a further improvement of the present application, the connection between the first mesh wire unit and the second mesh wire unit and the mesh frame is provided with a composite mesh wire unit.
[0014] As a further improvement of the present application, the composite mesh wire unit comprises a plurality of first composite sub-mesh wires arranged at the ends of two adjacent first sub-mesh wires and a plurality of second composite sub-mesh wires arranged at the ends of two adjacent second sub-mesh wires.
[0015] As a further improvement of the present application, the two adjacent first composite sub-mesh wires are arranged in a cross manner and form an included angle with the corresponding first sub-mesh wire.
[0016] And / or, the two adjacent second composite sub-mesh wires are arranged in a cross manner and form an included angle with the corresponding second sub-mesh wire.
[0017] As a further improvement of the present application, the first direction is perpendicular to the second direction.
[0018] The present application provides a screen printing structure for printing adhesive film. The screen printing structure for printing adhesive film provided by the present application is provided with a first mesh wire unit and a second mesh wire unit perpendicular to the corresponding edge of the mesh frame, so as to ensure that the openings between the first sub-mesh wire and the second sub-mesh wire and the edge of the mesh frame are uniform and do not have an inclined angle with each other, thereby avoiding the process glue from being left on the edge of the mesh frame during the printing process. The first yarn and the second yarn are arranged at the edge position of the mesh printing area, so as to reduce the opening rate of the edge position of the printing area, slow down the penetration speed of the process glue at the edge position compared with the normal printing position, and thereby achieve the purpose of inhibiting the edge overflow of the glue and thickening the adhesive film. The composite mesh wire unit is arranged to improve the tension of the mesh wire and solve the problems of mesh deformation and sharp reduction of tension caused by mechanical fatigue of the screen consumables, thereby prolonging the service life of the screen consumables. BRIEF DESCRIPTION OF DRAWINGS
[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.
[0020] Figure 1 Structure diagram of the screen structure for film printing provided in the related art;
[0021] Figure 2 Structure diagram of the first yarn in the screen structure for film printing provided in the embodiments of the present application;
[0022] Figure 3 Structure diagram of the composite screen unit in the screen structure for film printing provided in the embodiments of the present application;
[0023] Figure 4 Structure diagram of the screen structure for film printing provided in the embodiments of the present application;
[0024] Explanation of reference signs:
[0025] 1-frame; 2-screen hole;
[0026] 10-first screen unit; 11-first sub-screen; 12-first yarn;
[0027] 20-second screen unit; 21-second sub-screen; 22-second yarn;
[0028] 30-composite screen unit; 31-first composite sub-screen; 32-second composite sub-screen. DETAILED DESCRIPTION
[0029] In order to make the purpose, technical solutions and advantages of the present application more clear, the following will further describe the present application in combination with the drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.
[0030] In the description of the present application, the meaning of “a plurality of” is at least two, such as two, three, etc., unless otherwise explicitly and specifically limited. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly. In addition, the terms “include” and “have” and any variations thereof are intended to cover non-exclusive inclusion.
[0031] To make the description of the present disclosure more detailed and complete, the following describes the embodiments of the present application and specific examples; but this is not the only form of implementation or use of the specific embodiments of the present application. The embodiments include the features of the specific embodiments and the method steps and their order for constructing and operating the specific embodiments. However, other specific embodiments can also be used to achieve the same or equivalent functions and step sequences.
[0032] In a heterojunction cell-copper interconnection workshop, a "patterned" process such as coating-printing-developing is required before the electroplating process. Screen printing is a key step in this process, which can provide a recess "template" for the growth of electroplated copper ions that meets the process expectations. By printing a specific pattern or film on the cell sheet, the subsequent process uses these patterns to guide the deposition of copper ions to form a copper grid line structure that meets the requirements.
[0033] In the coating process, the related equipment of the traditional silver grid cell is used, such as the printing required screen material. The screen is usually composed of a screen frame, screen mesh, photosensitive glue or PI film (Polyimide Film, polyimide film), etc. The screen frame serves as a support to fix the screen mesh and keep it in a tight state.
[0034] Due to the difference between the coating process and the screen printing process, when the screen material is only provided with the screen mesh without the PI film with a specific pattern, some problems will occur in the subsequent printing process, such as irregular shape of the film edge due to the influence of the screen mesh structure, and excessive process glue flowing to the edge position during printing of the film due to the low mesh count of the screen, which cannot be completely recovered, resulting in abnormal thickening of the film at the edge of the cell sheet, etc. Therefore, the recess cannot be effectively opened in the subsequent process, resulting in the absence of grid lines at that position of the finished cell.
[0035] Please refer to Figure 1 The screen structure for printing the film provided in the related art is usually composed of a screen cloth with a certain angle of inclination. This structure has the result that the opening size at the edge of the screen is not completely uniform, as shown in Figure 1 This directly leads to the difference in process glue flow at the edge of the screen, resulting in irregular shape of the cell sheet from the edge. In the actual printing process, there is a large overflow of process glue at the edge of the screen, while the glue amount in the middle of the screen is normal. This phenomenon will cause the film at the edge of the screen to be continuously thick, and there will be a phenomenon of grid line absence in the subsequent process.
[0036] In the related art, the overflow of the process glue at the edge frame position is avoided by increasing the viscosity of the process glue. However, this method has certain limitations. Since the viscosity of the process glue is increased, the flowability of the glue is poor, and thus the screen holes cannot be smoothly filled when passing through the screen holes, resulting in the blockage of some screen holes, affecting the uniformity of printing, and causing the surface flatness of the printed glue film to be poor, further affecting the printing quality.
[0037] Based on the above reasons, please refer to Figures 2-4 The embodiment of the present application provides a screen printing structure of a glue film, which can avoid the thickening of the glue film caused by the overflow of the glue at the edge of the screen frame during printing, and ensures the printing quality.
[0038] Please refer to Figure 4 The structure of the screen printing structure of the glue film provided by the embodiment of the present application is shown in the structure diagram. The screen printing structure of the glue film provided by the present application comprises a screen frame 1, and a first screen yarn unit 10 and a second screen yarn unit 20 which are arranged in the screen frame 1.
[0039] As an optional implementation, the first screen yarn unit 10 comprises a plurality of first sub-screen yarns 11 arranged in the screen frame 1 along a first direction, and the second screen yarn unit 20 comprises a plurality of second sub-screen yarns 21 arranged in the screen frame 1 along a second direction. The plurality of first sub-screen yarns 11 and the plurality of second sub-screen yarns 21 are staggered with each other to form a plurality of screen holes 2.
[0040] It can be observed that, since the screen yarns in the prior art are arranged obliquely between the screen frame 1 and form a certain angle, such as 22.5° or 45°, the flow of the process glue in the edge area of the screen frame will be different, and there is no positive guiding effect on the glue film from the edge during the coating process. Therefore, by adjusting the angle between the screen yarns and the screen frame 1, that is, the angle between the first screen yarn unit 10, the second screen yarn unit 20 and the screen frame 1, the printing effect of the edge of the screen frame can be improved.
[0041] Specifically, a plurality of first sub-screen yarns 11 in the first screen yarn unit 10 are arranged perpendicular to the corresponding edge of the screen frame 1, and a plurality of second sub-screen yarns 21 in the second screen yarn unit 20 are arranged perpendicular to the corresponding edge of the screen frame 1, so as to ensure that the openings between the first sub-screen yarns 11 and the second sub-screen yarns 21 and the edges of the screen frame 1 are uniform, and there is no oblique angle between each other, avoiding the process glue remaining on the edge of the screen frame 1 during the printing process.
[0042] Preferably, a plurality of first sub-screen yarns 11 and a plurality of second sub-screen yarns 21 are arranged at equal intervals in the screen frame 1 and staggered with each other to form corresponding screen holes 2. The present application does not make too much description on this.
[0043] Please refer to Figure 2The structure diagram of the first yarn in the screen structure of the glue film printing provided by the embodiment of the application is shown in the figure. The application also locally increases the yarn at the edge position of the printing area to reduce the opening rate of the edge position of the printing area, so that the penetration speed of the process glue at the edge position is slowed down, thereby achieving the purpose of inhibiting edge overflow of the glue film and thickening the glue film.
[0044] Specifically, the application is provided with a plurality of first yarns 12 between at least two adjacent first sub-screen yarns 11 near the edge of the screen frame in the first direction, and a plurality of second yarns 22 between at least two adjacent second sub-screen yarns 21 near the edge of the screen frame in the second direction.
[0045] It can be understood that the diameter of the first yarn 12 or the second yarn 22 should be smaller than the first sub-screen yarn 11 and the second sub-screen yarn 21, so as to avoid the process glue from filling the screen hole 2 smoothly, resulting in partial screen hole 2 blockage and affecting the uniformity of printing.
[0046] Of course, the above at least two adjacent first sub-screen yarns 11 near the edge of the screen frame can also be three adjacent first sub-screen yarns 11 near the edge of the screen frame, four adjacent first sub-screen yarns 11, etc. The above setting modes are all feasible and are not limited to the two adjacent first sub-screen yarns 11 closest to the edge of the screen frame. The setting mode of the second yarn 22 and the second sub-screen yarn 21 is the same as that of the first sub-screen yarn 11, which should be understood by those skilled in the art.
[0047] On the basis of the above-mentioned angle-free screen yarn, the application increases the first yarn 12 and the second yarn 22 at the edge position of the printing area of the screen yarn, thereby reducing the opening rate of the edge position of the printing area, so that the penetration speed of the process glue at the edge position is slower than that at the normal printing position, thereby achieving the purpose of inhibiting edge overflow of the glue film and thickening the glue film.
[0048] For example, the number of the above-mentioned first yarn 12 and second yarn 22 can be set to 1-10.
[0049] Preferably, the above-mentioned increased first yarn 12 and second yarn 22 can be arranged at a position 200-400 microns away from the edge 200 of the screen frame 1. Of course, the number and arrangement position of the first yarn 12 and the second yarn 22 can be adjusted according to actual needs, as long as the technical effect of inhibiting edge overflow of the glue film and thickening the glue film is achieved, which is not limited by the application.
[0050] Further, in order to solve the problem of screen yarn tension reduction caused by changing the angle of the first screen yarn unit 10 and the second screen yarn unit 20 with the screen frame 1, the application also provides a composite screen yarn unit 30 at the connection position of the first screen yarn unit 10 and the second screen yarn unit 20 with the screen frame 1.
[0051] Specifically, refer to Figure 3 The structure diagram of a composite screen unit in a screen structure for adhesive film printing provided by the embodiment of the present application, the composite screen unit 30 includes a plurality of first composite sub-screens 31 arranged at the ends of the adjacent two first sub-screens 11, and a plurality of second composite sub-screens 32 arranged at the ends of the adjacent two second sub-screens 21.
[0052] It can be observed that the adjacent two first composite sub-screens 31 are arranged in cross and form an included angle between the corresponding first sub-screens 11, and the adjacent two second composite sub-screens 32 are arranged in cross and form an included angle between the corresponding second sub-screens 21.
[0053] It should be noted that the included angle between the first composite sub-screens 31 and the first sub-screens 11, and the included angle between the second composite sub-screens 32 and the second sub-screens 21 are not 90 degrees.
[0054] The present application forms an included angle between the first composite sub-screens 31 and the first sub-screens 11, and the adjacent two first composite sub-screens 31 are arranged in cross, forms an included angle between the second composite sub-screens 32 and the second sub-screens 21, and the adjacent two second composite sub-screens 32 are arranged in cross, which greatly improves the tension of the screen, improves the problem of screen deformation and sharp reduction of tension of the screen consumables due to mechanical fatigue, and improves the service life of the screen consumables.
[0055] In one specific embodiment provided by the present application, the first direction is arranged perpendicular to the second direction, and of course other arrangement forms are also feasible, which are not limited by the present application.
[0056] The screen structure for adhesive film printing provided by the present application arranges the first screen unit and the second screen unit perpendicular to the corresponding edges of the screen frame, ensures the uniformity of the opening between the first sub-screens and the second sub-screens and the edges of the screen frame, and avoids the process adhesive from being left on the edges of the screen frame in the printing process; the first yarn and the second yarn are added at the edge position of the screen printing area, the opening rate of the edge position of the printing area is reduced, the penetration speed of the process adhesive at the edge position is slower than that at the normal printing position, so as to achieve the purpose of inhibiting the edge overflow of the adhesive film and thickening the adhesive film; the composite screen unit is arranged to improve the tension of the screen, improve the problem of screen deformation and sharp reduction of tension of the screen consumables due to mechanical fatigue, and improve the service life of the screen consumables.
[0057] It can be understood that the technical features of the above embodiments can be combined in any manner, and in order to make the description concise, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combinations of the technical features do not exist contradictory, they should be considered as the scope of the present application.
[0058] The above embodiments are merely exemplary embodiments adopted for illustrating the principles of the present application, and the present application is not limited thereto. Various modifications and improvements can be made by those of ordinary skill in the art without departing from the spirit and essential characteristics of the present application, and such modifications and improvements are also considered to be within the scope of the present application.
Claims
1. A screen printing structure for film printing, characterized in that, It includes a wire frame, and a first wire mesh unit and a second wire mesh unit intersecting inside the wire frame; The first mesh unit includes a plurality of first sub-mesh units disposed inside the mesh frame along a first direction, and the second mesh unit includes a plurality of second sub-mesh units disposed inside the mesh frame along a second direction; Among them, several of the first sub-mesh and several of the second mesh are perpendicular to the corresponding edges of the mesh frame.
2. The screen printing structure for film printing as described in claim 1, characterized in that, Between at least two adjacent first sub-nets near the edge of the mesh frame, a plurality of first yarns are arranged along a first direction.
3. The screen printing structure for film printing as described in claim 2, characterized in that, Between at least two adjacent second sub-nets near the edge of the mesh frame, a plurality of second yarns are arranged along the second direction.
4. The screen printing structure for film printing as described in claim 3, characterized in that, The number of the first yarn and the second yarn is 1-10 each.
5. The screen printing structure for film printing as described in claim 3, characterized in that, Multiple first yarns and second yarns are positioned at a distance of 200-400 micrometers from the edge of the mesh frame.
6. The screen printing structure for film printing as described in claim 1, characterized in that, Several first sub-mesh nets and several second sub-mesh nets are arranged at equal intervals inside the mesh frame.
7. The screen printing structure for film printing as described in claim 1, characterized in that, A composite mesh unit is provided at the connection point between the first mesh unit and the second mesh unit and the mesh frame.
8. The screen printing structure for film printing as described in claim 7, characterized in that, The composite mesh unit includes several first composite sub-meshes located at the ends of two adjacent first sub-meshes, and second composite sub-meshes located at the ends of two adjacent second sub-meshes.
9. The screen printing structure for film printing as described in claim 8, characterized in that, The two adjacent first composite sub-nets are arranged crosswise and form an angle with the first sub-nets at the corresponding positions; And / or, two adjacent second composite sub-nets are arranged crosswise, forming an angle with the second sub-nets at the corresponding positions.
10. The screen printing structure for film printing as described in any one of claims 1-9, characterized in that, The first direction is perpendicular to the second direction.