Screen printing plate

Abstract

The utility model discloses a screen printing plate. The screen printing plate comprises a screen frame and a screen printing plate body tensioned in the screen frame. The screen frame comprises a first frame edge parallel to the X direction and a second frame edge parallel to the Y direction crossed with the X direction, and the first frame edge and the second frame edge are alternately arranged in a surrounding mode to form the screen frame. The screen printing plate body comprises a printing area and a transition area located on the periphery of the printing area, a plurality of grid lines are arranged in the printing area in a penetrating mode, and the grid lines extend in the Y direction. A force unloading area located between the printing area and the second frame edge is arranged in the transition area, the force unloading area is longitudinally arranged, the length direction of the force unloading area is parallel to the grid lines, the force unloading area can absorb acting force such as tension acting on the grid lines, the grid lines can be protected and prevented from being deformed or broken, the screen printing plate body is prevented from being damaged, quality is improved, and the service life is prolonged. The printing quality is improved.

Description

Technical Field

[0001] This application relates to the field of screen printing technology, and more particularly to a printing screen. Background Technology

[0002] Printing screens are an important tool in the electronics field. Taking the printing of solar cell electrodes as an example, paste is poured onto the printing screen, and a squeegee is used to move the paste on the printing screen, so that the paste is squeezed through the grid lines on the printing screen onto the solar cell, forming a corresponding pattern on the solar cell to form the solar cell electrode.

[0003] A typical printing screen consists of a frame and a screen body. The screen body comprises several striped grid lines. Tension is applied around the screen body to stretch the screen onto the frame. However, applying tension to the frame can easily cause deformation or breakage of the grid lines, resulting in damage to the screen body and affecting printing quality. Therefore, there is an urgent need to provide a new printing screen structure to solve the technical problems in the existing technology. Utility Model Content

[0004] The purpose of this application is to provide a printing screen to solve the problem in the prior art that when tension is applied to the screen frame body, the grid lines are easily deformed or broken, which causes damage to the screen body and affects the printing quality.

[0005] To achieve the above objectives, this application adopts the following technical solution:

[0006] A printing screen comprising:

[0007] A wire frame includes a first frame side parallel to the X direction and a second frame side parallel to the Y direction intersecting the X direction, wherein the first frame side and the second frame side are alternately arranged to form the wire frame;

[0008] A screen printing body is tensioned within the screen frame. The screen printing body includes a printing area and a transition area located around the printing area. A plurality of through-type grid lines are provided in the printing area, and the grid lines extend toward the Y direction.

[0009] The transition zone includes a stress-relief zone located between the printing area and the second frame edge. The stress-relief zone is longitudinally arranged and its length direction is parallel to the grid line.

[0010] In one embodiment, the length of the stress relief zone is less than or equal to the length of the grid line, and the stress relief zones are symmetrically arranged on both sides of the printing area in the X direction.

[0011] In one embodiment, a second stress-relief zone is further provided within the transition zone, located between the printing area and the first frame edge. The second stress-relief zone is longitudinally arranged and its length direction is perpendicular to the grid line.

[0012] In one embodiment, the printing area further includes a third stress-relief area that is longitudinally arranged, the third stress-relief area being arranged parallel to the grid lines and located on both sides of the grid lines along the X direction.

[0013] In one embodiment, the stress-relief zone is made of an elastic material, and the elasticity of the stress-relief zone is greater than that of the transition zone.

[0014] In one embodiment, the stress-relief zone includes an elastic mesh or an elastic membrane.

[0015] In one embodiment, the mesh body is stretched to the mesh frame by a first tension and a second tension, the first tension being perpendicular to the length direction of the unloading zone, the second tension being parallel to the length direction of the unloading zone, and the second tension being greater than the first tension.

[0016] In one embodiment, the difference between the second tension and the first tension is F, where 0.5N ≤ F ≤ 15N.

[0017] In one embodiment, the transition zone is grid-shaped, and the transition zone grid is composed of a first grid line and a second grid line. The first grid line is parallel to the X direction, and the second grid line is parallel to the Y direction, or the second grid line forms an angle α with the X direction, and the angle α is in the range of 0° < α ≤ 45°.

[0018] In one embodiment, the printing area is composed of a metal plate, the metal plate including a first metal layer and a second metal layer stacked together, the first metal layer including a squeegee surface and a through-hole first groove, the second metal layer including a printing surface and a through-hole second groove, the first groove and the second groove corresponding to and connected to form the grid lines.

[0019] In one embodiment, the metal plate is a knotless metal plate, and a protective layer is provided on the printed surface.

[0020] In one embodiment, the printing area is composed of a metal mesh, which includes a grid area and a grid line area. The grid area includes a third grid line extending along the X direction and a fourth grid line extending along the Y direction. The grid line area includes a plurality of connecting bridges spaced apart and a cutout portion disposed through adjacent connecting bridges. The connecting bridges and the cutout portion form the grid line.

[0021] In one embodiment, the third grid line and the fourth grid line are integrally intersected without any mesh. The two ends of the connecting bridge are respectively connected to the third grid line. The connecting bridge has a thinning section with a reduced thickness in the Z direction perpendicular to the plane containing the X and Y directions. The third grid line has a guide bridge connected to the connecting bridge. The guide bridge has an auxiliary thinning section with a reduced thickness in the Z direction. The guide bridge and the connecting bridge are connected through the thinning section and the auxiliary thinning section.

[0022] In one embodiment, the metal mesh further includes a composite layer, the composite layer including a printing channel communicating with the cutout portion, wherein the width of the printing channel in the X direction is less than or equal to the width of the cutout portion.

[0023] The beneficial effects of this application are as follows: The transition zone of this application is provided with a stress relief zone located in the printing area and the second frame edge. The stress relief zone is arranged longitudinally and its length direction is parallel to the grid line. The stress relief zone can absorb the tension and other forces acting on the grid line, protect the grid line from deformation or breakage, prevent damage to the screen printing body, improve quality, extend service life, and improve printing quality. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the planar structure of the printing screen for this application;

[0025] Figure 2 This is a partial schematic diagram showing the connection between the transition zone and the stress relief zone of the printing screen in this application;

[0026] Figure 3 This is another partial schematic diagram showing the connection between the transition zone and the stress relief zone of the printing screen in this application;

[0027] Figure 4 This is another partial schematic diagram showing the connection between the transition zone and the stress relief zone of the printing screen in this application;

[0028] Figure 5 This is a schematic diagram of another planar structure of the printing screen for this application;

[0029] Figure 6 This is a schematic diagram of another planar structure of the printing screen for this application;

[0030] Figure 7 This is a schematic diagram of another planar structure of the printing screen for this application;

[0031] Figure 8 This is a schematic diagram of another planar structure of the printing screen for this application;

[0032] Figure 9 This is a schematic diagram of another planar structure of the printing screen for this application;

[0033] Figure 10 This is a schematic diagram of a cross-sectional structure of the printing screen of this application;

[0034] Figure 11 for Figure 10 Another cross-sectional structural diagram;

[0035] Figure 12 This is a schematic diagram of another cross-sectional structure of the printing screen of this application;

[0036] Figure 13 This is a partial planar structural diagram of the printing area of ​​the printing screen in this application;

[0037] Figure 14 for Figure 13 A schematic diagram of a partial cross-sectional structure;

[0038] Figure 15 This is a schematic diagram of another cross-sectional structure of the printing screen of this application;

[0039] Figure 16 This is a schematic diagram of another cross-sectional structure of the printing screen for this application.

[0040] In the picture:

[0041] 1. Frame; 11. First frame edge; 12. Second frame edge;

[0042] 2. Screen printing body; 21. Printing area; 22. Transition area; 221. First grid line; 222. Second grid line; 23. Grid line; 24. Stress relief area; 241. Elastic grid; 242. Elastic membrane; 25. Second stress relief area; 26. Third stress relief area;

[0043] 3. Metal plate; 31. First metal layer; 311. Squeegee surface; 312. First groove; 313. Bridging; 32. Second metal layer; 321. Printing surface; 322. Second groove;

[0044] 4. Metal mesh; 41. Grid area; 411. Third grid line; 4111. Guide bridge; 4112. Auxiliary thinning section; 412. Fourth grid line; 42. Grid line area; 421. Connecting bridge; 422. Hollowed-out section; 4211. Thinning section; 43. Composite layer; 431. Printing channel. Detailed Implementation

[0045] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings. Preferred embodiments of this application are shown in the drawings. However, this application can be implemented in many different forms and is not limited to the embodiments described below. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this application.

[0046] It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0047] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0048] This application discloses a printing screen, comprising a screen frame and a screen body tensioned within the screen frame. The screen frame includes a first frame edge parallel to the X direction and a second frame edge parallel to the Y direction intersecting the X direction, with the first and second frame edges alternately surrounding the screen frame. The screen body includes a printing area and a transition area surrounding the printing area. A plurality of through-type grid lines are provided within the printing area, extending towards the Y direction. A stress-relief zone is provided within the transition area between the printing area and the second frame edge. The stress-relief zone is longitudinally arranged, with its length parallel to the grid lines. The stress-relief zone absorbs tension and other forces acting on the grid lines, protecting them from deformation or breakage, thus preventing damage to the screen body, improving quality, extending service life, and enhancing printing quality.

[0049] Specifically, the grid lines extend in the Y direction either parallel to the Y direction or at an angle to the Y direction, with the angle being less than or equal to 45°. Therefore, the grid lines are generally considered to extend in the Y direction. The unloading zone is set to have a length greater than its width, forming an overall elongated strip shape.

[0050] In one embodiment, the X direction is perpendicular to the Y direction, the first frame edge is perpendicular to the second frame edge, and the frame is rectangular; the grid lines extend parallel to the Y direction, or the angle between them and the Y direction is less than or equal to 45°, and several grid lines are spaced apart and arranged parallel to each other. The stress-relief zone is a long, thin strip, and its long side is parallel to the grid lines.

[0051] In one embodiment, the length of the stress-relieving zone is greater than, equal to, or less than the length of the grid line, and the stress-relieving zones on both sides of the printing area are symmetrically or randomly arranged. The length, width, and position of the stress-relieving zone are set according to the shape of the grid line and the magnitude of the force applied, so as to effectively absorb tension and other forces, thereby protecting the grid line, increasing its lifespan, and improving printing quality.

[0052] In one embodiment, a second stress-relief zone is further provided in the transition zone between the printing area and the first frame edge. The second stress-relief zone is longitudinally arranged and its length direction is perpendicular to the grid line. The second stress-relief zone can absorb some tension and other forces perpendicular to the grid line, further protecting the grid line, improving its lifespan, and improving printing quality.

[0053] In one embodiment, the printing area further includes a third unloading area that is arranged longitudinally. The third unloading area is arranged parallel to the grid lines and located on both sides of the grid lines. The third unloading area is mainly used to absorb the force exerted by the doctor blade on the printing area during printing, which can protect the grid lines and ensure the quality of ink application.

[0054] In one embodiment, the stress relief zone is made of an elastic material, and the elasticity of the stress relief zone is greater than that of the transition zone, so that the tension is mainly absorbed by the elastic material of the stress relief zone, thereby reducing the tension acting on the grid line and protecting the grid line.

[0055] In one embodiment, the stress-relief zone is an elastic mesh or elastic membrane made of nylon, polyethylene, polyolefin, ethylene-vinyl acetate copolymer, rubber, aramid fiber, resin, sponge or Teflon material, thereby improving the elasticity of the stress-relief zone and thus improving the stress-relief effect of the stress-relief zone.

[0056] In one embodiment, the second unloading zone is made of an elastic material, and the elasticity of the second unloading zone is greater than that of the transition zone. The second unloading zone is an elastic mesh or elastic membrane made of rubber, aramid fiber, resin, sponge or Teflon material, thereby improving the elasticity of the second unloading zone and thus improving the unloading effect of the second unloading zone.

[0057] In one embodiment, the third stress relief zone is a plurality of closely arranged fine lines disposed in the printing area.

[0058] In one embodiment, the mesh body is stretched onto the mesh frame by a first tension F1 and a second tension F2. The first tension F1 is perpendicular to the length direction of the stress relief zone, and the second tension F2 is parallel to the length direction of the stress relief zone, and the second tension F2 is greater than the first tension F1. The difference between the second tension F2 and the first tension F1 is F, where 0.5N≤F≤15N, which enables the mesh body to be effectively stretched onto the mesh frame.

[0059] In one embodiment, the transition zone is grid-shaped, and the transition zone grid is composed of a first grid line and a second grid line. The first grid line is parallel to the X direction, and the second grid line is parallel to the Y direction, or the second grid line forms an angle α with the X direction, and the range of the angle α is 0° < α ≤ 45°.

[0060] In one embodiment, the printing area is composed of a metal plate, which includes a first metal layer and a second metal layer stacked together. The first metal layer includes a squeegee surface and a through-hole first groove, and the second metal layer includes a printing surface and a through-hole second groove. The first and second grooves are corresponding and connected to form grid lines. The metal plate is a knotless metal plate, and a protective layer is applied to the printing surface to protect the substrate, such as a silicon wafer for a solar cell, during printing, thereby improving printing quality.

[0061] In one embodiment, the printing area is composed of a metal mesh, which includes a grid area and a grid line area. The grid area includes a third grid line extending along the X direction and a fourth grid line extending along the Y direction. The grid line area includes a plurality of connecting bridges spaced apart and a perforated portion located between adjacent connecting bridges, with the connecting bridges and the perforated portion forming the grid lines. The third and fourth grid lines are integrally intersecting without any mesh knots. The two ends of the connecting bridges are respectively connected to the third grid lines. The connecting bridges have a thinning portion with a decreasing thickness in the Z direction perpendicular to the plane containing the X and Y directions. The third grid lines have a guide bridge connected to the connecting bridges, and the guide bridge has an auxiliary thinning portion with a decreasing thickness in the Z direction. The thinning portion and the auxiliary thinning portion can improve ink adhesion and improve printing quality.

[0062] In one embodiment, the metal mesh further includes a composite layer, which includes a printing channel connected to the cutout portion. The width of the printing channel is less than or equal to the width of the cutout portion, thereby controlling the amount of ink applied and improving printing quality.

[0063] The following illustrations illustrate an example of the printing screen of this application.

[0064] Please refer to Figure 1 This application discloses a printing screen 100, which includes a screen frame 1 and a screen body 2 tensioned within the screen frame 1. The screen frame 1 includes a first frame edge 11 parallel to the X direction and a second frame edge 12 parallel to the Y direction perpendicular to the X direction. The first frame edge 11 and the second frame edge 12 alternately enclose the screen frame 1 to form a rectangle. The screen body 2 includes a printing area 21 located in the central region and a transition area 22 located around the printing area 21. The transition area 22 connects the printing area 21 and the screen frame 1. A plurality of through-wires 23 are provided in the printing area 21, and the wires 23 extend parallel to the Y direction. Among them, a stress-relieving area 24 is provided in the transition area 22 between the printing area 21 and the second frame edge 12. The stress-relieving area 24 is longitudinally arranged and its length direction is parallel to the wires 23. The stress-relieving area 24 can absorb the tension and other forces acting on the wires 23, protect the wires 23, prevent the wires 23 from deformation or breakage, prevent damage to the screen body 2, improve quality, extend service life, and improve printing quality.

[0065] The mesh body 2 is stretched onto the mesh frame 1 by a first tension F1 and a second tension F2. The first tension F1 is perpendicular to the length direction of the stress-relief zone 24, i.e., the first tension F1 is a force in the X direction; the second tension F2 is parallel to the length direction of the stress-relief zone 24, i.e., the second tension F2 is a force in the Y direction. The second tension F2 is greater than the first tension F1. The difference between the second tension F2 and the first tension F1 is F, where 0.5N≤F≤15N, which is sufficient to ensure that the mesh body 2 is effectively stretched onto the mesh frame 1.

[0066] The stress-relief zone 24 is made of an elastic material. The elasticity of the stress-relief zone 24 is greater than that of the transition zone 22. When the two mesh bodies are stretched onto the mesh frame 1, the elastic material of the stress-relief zone 24 absorbs the force, thereby reducing the force acting on the grid wire 23 and protecting the grid wire 23. The elastic material of the stress-relief zone 24 is, for example, a highly elastic material such as nylon, polyethylene, polyolefin, ethylene-vinyl acetate copolymer, rubber, aramid fiber, resin, sponge, or Teflon. The stress-relief zone 24 is an elastic mesh 241 or elastic membrane 242 made of elastic material. The elastic mesh 241 or elastic membrane 242 has good elasticity and toughness, thereby improving the stress-relief effect of the stress-relief zone 24.

[0067] Please refer to Figure 2 The stress-relief zone 24 is an elastic mesh 241 made of elastic material, and the transition zone 22 is a mesh made of polyester mesh fabric. The stress-relief zone 24 and the transition zone 22 are connected by overlapping of the elastic mesh 241 of the stress-relief zone 24 and the mesh of the transition zone 22, and the two meshes are bonded together with adhesive. The mesh of the transition zone 22 is composed of a first mesh line 221 and a second mesh line 222, which are perpendicularly intersecting each other, and the second mesh line 222 forms an angle α with the X direction. In this embodiment, α = 45°, and in other embodiments, the range of the angle α is 0° < α ≤ 45°. Preferably, the mesh lines of the elastic mesh 241 of the stress-relief zone 24 are different from the extension directions of the first mesh line 221 and the second mesh line 222 of the transition zone 22. For other embodiments, please refer to... Figure 3 After the elastic mesh 241 of the stress-relief zone 24 and the mesh of the transition zone 22 overlap, holes are drilled at the overlap point, and adhesive is filled into the holes to achieve a firm connection between the stress-relief zone 24 and the transition zone 22. Please refer to... Figure 4 The stress relief zone 24 is an elastic membrane 242 made of elastic material. The elastic membrane 242 and the transition zone 22 are connected by direct adhesive or perforated filling adhesive.

[0068] Please refer to Figure 1In this embodiment, the stress-relieving area 24 is rectangular, with a length equal to the length of the printing area 21, and the stress-relieving areas 24 located on both sides of the printing area 21 are symmetrically arranged relative to the printing area 21. The stress-relieving areas 24 are distributed in the middle of the transition area 22 between the frame 1 and the printing area 21, and the width of the stress-relieving area 24 is half the width of the transition area 22 at this location. In other embodiments, the width of the stress-relieving area 24 may be less than or greater than half the width of the transition area 22 at this location. For other embodiments, please refer to... Figure 5 The length of the unloading zone 24 is equal to the length of the grid line 23, and the unloading zones 24 on both sides are symmetrically arranged; please refer to Figure 6 The unloading zone 24 on one side is divided into two, spaced apart along the length, and the unloading zones 24 on both sides are symmetrically arranged in pairs; please refer to Figure 7 The stress relief zone 24 is randomly positioned between the frame 1 and the printing area 21, and the stress relief zones 24 on both sides are asymmetrically positioned. The shape, length, width, and position of the stress relief zone 24 are not fixed and are set according to factors such as tension and grid lines 23.

[0069] Please refer to Figure 8 Within the transition zone 22, a second stress-relief zone 25 is also provided, located between the printing zone 21 and the first frame edge 11. The second stress-relief zone 25 is longitudinally positioned with its length direction perpendicular to the grid line 23. The second stress-relief zone 25 is also perpendicular to the stress-relief zone 24. The second stress-relief zone 25 can absorb some tension and other forces perpendicular to the grid line 23, further protecting the grid line 23 and improving the efficiency and quality of the wire mesh. The second stress-relief zone 25 is made of an elastic material, and its elasticity is greater than that of the transition zone 22. The second stress-relief zone 25 is an elastic mesh 241 or elastic film 242 made of rubber, aramid fiber, resin, sponge, or Teflon material, thereby improving the elasticity of the second stress-relief zone 25 and thus enhancing its stress-relief effect.

[0070] Please refer to Figure 9 The printing area 21 also includes a longitudinally arranged third stress-relief area 26. The third stress-relief area 26 is parallel to the grid lines 23 and located on both sides of the grid lines 23. The third stress-relief area 26 is also parallel to stress-relief areas 24. The third stress-relief area 26 is mainly used to absorb the force exerted by the doctor blade on the printing area 21 during printing, thus protecting the grid lines 23 and improving ink application quality. In this embodiment, the third stress-relief area 26 consists of several closely arranged fine lines disposed in the printing area 21. In other embodiments, the third stress-relief area 26 can also be made of an elastic material.

[0071] Please refer to Figure 10 and Figure 11The printing area 21 is composed of a metal plate 3, which includes a first metal layer 31 and a second metal layer 32 stacked together. The first metal layer 31 includes a doctor blade surface 311 and a through-hole first groove 312, and the second metal layer 32 includes a printing surface 321 and a through-hole second groove 322. The first groove 312 and the second groove 322 are corresponding and connected to form a line channel, and adjacent line channels form grid lines 23. The first metal layer 31 also includes a plurality of bridges 313, which are spaced apart along the length of the grid lines 23. The first groove 312 is cut into multiple sections by the bridges 313, and the bridges 313 are mounted on the second groove 322 to improve the quality of the grid lines 23. The metal plate 3 is a knotless metal plate, which has good ink dispensing performance.

[0072] Please refer to Figure 12 In another embodiment, a protective layer 33 is provided on the printing surface 321 to protect the substrate during printing, such as preventing the silicon wafer of a solar cell from cracking, thereby improving printing quality. Preferably, the protective layer 33 is a soft metal layer with low Mohs hardness, such as a tin layer, which can be deposited on the printing surface 321 by electroplating.

[0073] Please refer to Figure 13 and Figure 14 The printing area 21 is composed of a metal mesh 4, which includes a grid area 41 and a grid line area 42. The grid area 41 includes a third grid line 411 extending along the X direction and a fourth grid line 412 extending along the Y direction. The grid line area 42 includes a plurality of connecting bridges 421 spaced apart and a perforated portion 422 located between adjacent connecting bridges 421. The connecting bridges 421 and the perforated portion 422 form the grid line 23. The third grid line 411 and the fourth grid line 412 are arranged in an integral, un-knotted manner. The two ends of the connecting bridge 421 are respectively connected to the third grid line 411. The connecting bridge 421 has a thinning portion 4211 with a reduced thickness in the Z direction perpendicular to the plane containing the X and Y directions. The third grid line 411 has a guide bridge 4111 connected to the connecting bridge 421. The guide bridge 4111 has an auxiliary thinning portion 4112 with a reduced thickness in the Z direction. The thinning portion 4211 and the auxiliary thinning portion 4112 can improve ink application and printing quality.

[0074] There are two grid areas 41, which are located on both sides of the grid area 42 along the X direction.

[0075] In other embodiments, please refer to Figure 15 The connecting bridge 421 has a gradually varying thickness, meaning it is thinner in the middle and gradually thickens towards both sides, with the thinning portion 4211 being arc-shaped. The guide bridge 4111 also has a gradually varying thickness, with the auxiliary thinning portion 4112 being arc-shaped, and the connection between the guide bridge 4111 and the thinning portion 4211 is smoothly transitioned. These features help improve ink adhesion and print quality.

[0076] Please refer to Figure 16 In another embodiment, the metal mesh 4 further includes a composite layer 43, which includes a printing channel 431 communicating with the cutout portion 422. The width of the printing channel 431 is less than or equal to the width of the cutout portion 422, controlling the amount of ink applied and improving printing quality. In one embodiment, the composite layer 43 is a PI layer, which has good formability. The composite layer 43 can be directly molded and laminated, or it can be laminated through an adhesive layer.

[0077] To make the above-described objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application have been described in detail above with reference to the accompanying drawings. Many specific details have been set forth in the above description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described above, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed above. Furthermore, the technical features of the embodiments described above can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments have been described; however, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification.

[0078] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A printing screen, characterized in that It includes: A screen frame, which includes a first frame edge parallel to the X direction and a second frame edge parallel to the Y direction arranged transversely to the X direction, the first frame edge and the second frame edge are alternately surrounded to form the screen frame; A screen version body tensioned in the screen frame, the screen version body includes a printing area and a transition area located around the printing area, the printing area is provided with a plurality of through arranged screen lines, the screen lines extend towards the Y direction; Wherein, the transition area is provided with a force relief area between the printing area and the second frame edge, the force relief area is longitudinally arranged and its length direction is parallel to the screen line.

2. The printing screen according to claim 1, characterized in that The length of the force relief area is less than or equal to the length of the screen line, and in the X direction, the force relief areas on both sides of the printing area are symmetrically arranged.

3. The printing screen according to claim 1, characterized in that The transition area is also provided with a second force relief area between the printing area and the first frame edge, the second force relief area is longitudinally arranged and its length direction is perpendicular to the screen line.

4. The printing screen according to claim 1, characterized in that The printing area also includes a third force relief area arranged longitudinally, the third force relief area is parallel to the screen line and is located on both sides of a plurality of screen lines along the X direction.

5. The printing screen according to claim 1, characterized in that The force relief area is made of elastic material, and the elasticity of the force relief area is greater than that of the transition area.

6. The printing screen according to claim 5, characterized in that The force relief area includes an elastic grid or an elastic film.

7. The printing screen according to claim 1, characterized in that The screen version body is tensioned in the screen frame by a first tension and a second tension, the first tension is perpendicular to the length direction of the force relief area, the second tension is parallel to the length direction of the force relief area, and the second tension is greater than the first tension.

8. The printing screen according to claim 7, characterized in that The difference between the second tension and the first tension is F, wherein 0.5N≤F≤15N.

9. The printing screen according to claim 1, characterized in that The transition area is grid-shaped, the transition area grid is composed of a first grid line and a second grid line, the first grid line is parallel to the X direction, the second grid line is parallel to the Y direction, or the second grid line forms an angle α with the X direction, the range of the angle α is 0°<α≤45°.

10. The printing screen according to claim 1, characterized in that The printing area is composed of a metal plate, the metal plate includes a first metal layer and a second metal layer arranged in layers, the first metal layer includes a doctor blade surface and a first slot arranged through, the second metal layer includes a printing surface and a second slot arranged through, the first slot and the second slot are correspondingly and continuously arranged to form the screen line.

11. The printing screen according to claim 10, characterized in that The metal plate is a knotless metal plate, and a protective layer is arranged on the printing surface.

12. The printing screen according to claim 1, characterized in that The printing area is composed of a metal mesh, the metal mesh includes a grid area and a screen line area, the grid area includes a third grid line extending along the X direction and a fourth grid line extending along the Y direction, the screen line area includes a plurality of connection bridges arranged at intervals and a hollow part arranged through between adjacent connection bridges, the connection bridge and the hollow part form the screen line.

13. The printing screen according to claim 12, characterized in that The third grid line and the fourth grid line are integrally crossed without a knot, two ends of the connecting bridge are connected with the third grid line respectively, the connecting bridge is provided with a thinning portion with a thickness decreasing in a Z direction perpendicular to a plane where the X direction and the Y direction are located, the third grid line is provided with a lead bridge connected with the connecting bridge, and the lead bridge is provided with an auxiliary thinning portion with a thickness decreasing in the Z direction; and the lead bridge and the connecting bridge are connected through the thinning portion and the auxiliary thinning portion.

14. The printing screen according to claim 13, characterized in that The metal mesh further comprises a composite layer, the composite layer comprises a printing channel arranged in communication with the hollow part, and in the X direction, the width of the printing channel is less than or equal to the width of the hollow part.

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