Main grid screen printing plate, fine grid screen printing plate and printing screen printing plate

Abstract

The utility model discloses a main grid screen printing plate which comprises a bearing body, a plurality of main grid lines and a plurality of connecting point groups, the main grid lines and the connecting point groups are respectively arranged on the bearing body, the main grid lines are arranged at intervals along a first direction, each main grid line comprises a linear hollow main rod extending along a second direction, and the connecting point groups are arranged at intervals along the first direction. The connecting point group comprises a plurality of small and short penetrating lines which are arranged at intervals in the second direction, and the linear hollow main rod and the small and short penetrating lines are arranged at intervals. When the electrode of the solar cell is printed, the problem of wire breakage during sintering or welding can be avoided, so that the yield and the quality stability are ensured, and the efficiency is improved. In addition, the utility model further discloses a fine grid screen printing plate and a printing screen printing plate. The printing screen comprises a screen frame and a main grid screen or a fine grid screen tensioned on the screen frame.

Description

Technical Field

[0001] The present application relates to the technical field of printing screens, and in particular to a main grid screen, a fine grid screen and a printing screen. Background Art

[0002] The printing screen is an important tool for printing the electrodes of solar cells. The slurry is poured onto the printing screen and moved on the printing screen with a scraper. The slurry is squeezed through the mesh holes on the printing screen and squeezed onto the solar cell, forming a corresponding pattern on the solar cell to form the electrode of the solar cell.

[0003] Conventional solar cells are printed on the surface of fine grid electrodes and main grid electrodes using a screen printing technique. The fine grid electrodes are used to collect current generated by light, while the main grid electrodes are used to collect current on the fine grid electrode lines. The fine grid screen of the printed screen is used to print the fine grid electrodes, while the main grid screen is used to print the main grid electrode. However, after printing the fine grid screen, the fine grid electrodes need to be sintered, and after printing the main grid screen, the main grid electrode needs to be sintered. This can easily lead to broken wires at the intersection of the fine grid electrode lines and the main grid electrode lines, resulting in reduced power of the solar cell and, in turn, overall power loss of the solar cell module. Summary of the Invention

[0004] Based on this, it is necessary to provide a new main grid screen, fine grid screen and printing screen assembly to solve the above technical problems.

[0005] A technical solution of the present application is: a main grid plate, which includes a carrier and a plurality of main grid lines and a plurality of connection point groups respectively arranged on the carrier, wherein the plurality of main grid lines are arranged at intervals along a first direction, the main grid lines include linear hollow main rods extending along a second direction, the plurality of connection point groups are arranged at intervals along the first direction, the connection point groups include a plurality of through short lines arranged at intervals along the second direction, and the linear hollow main rods and the through short lines are arranged at intervals.

[0006] In one embodiment, the width D1 of the through short line is in the range of 10 μm≤D1≤100 μm, the length L1 is in the range of 120 μm≤L1≤1200 μm, and the length direction thereof extends along the first direction.

[0007] In one embodiment, at least one connection point group is disposed between two adjacent main grid lines.

[0008] In one embodiment, the penetrating short lines are in the shape of a rectangle, a waist-shaped hole, or a parallelogram.

[0009] In one embodiment, the main grid lines and the connection point groups are alternately arranged at equal intervals.

[0010] In one embodiment, the through-small short lines are symmetrically arranged on both sides of the linear hollow main rod, and the interval between the through-small short lines and the adjacent linear hollow main rods is in the range of 100 μm-800 μm.

[0011] In one embodiment, the through-going short line is arranged on one side of the linear hollow main rod, and the interval between the through-going short line and the adjacent linear hollow main rod is in the range of 200 μm-1000 μm.

[0012] The present invention also discloses a fine grid screen, which includes a base layer and a plurality of fine grid lines arranged on the base layer, wherein the fine grid lines extend along a first direction, and the plurality of fine grid lines are arranged at intervals in a second direction; the fine grid lines include a plurality of strip-shaped hollow portions arranged at intervals along the extension direction; the fine grid screen is used in combination with the main grid screen as described above.

[0013] In one embodiment, the strip-shaped hollow portion is cross-matched with the linear hollow main rod of the main grid plate, and the through-short lines of the main grid plate are overlapped and matched with the adjacent strip-shaped hollow portion.

[0014] In one embodiment, the strip-shaped hollow portion is provided with a gradient section with a gradually changing width.

[0015] In one embodiment, the strip-shaped hollow portion includes a slender strip and a widened short strip, the widened short strip is arranged between adjacent slender strips and is spaced apart from the slender strip on at least one side, and the widened short strip is cross-matched with the linear hollow main rod.

[0016] The utility model also discloses a printing screen, which comprises a screen frame and the main grid screen or the fine grid screen as described above, which is tensioned in the screen frame.

[0017] The present invention has the following beneficial effects: A plurality of connection point groups are arranged at intervals along a first direction, and the connection point groups include a plurality of through-line shorts arranged at intervals along a second direction. The linear hollow main rods and the through-line shorts are arranged at intervals. This prevents wire breakage during sintering or welding when printing solar cell electrodes, thereby ensuring yield and quality stability and improving efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a planar distribution diagram of the busbars and connection point groups of the busbar grid plate of this application;

[0019] Figure 2 for Figure 1 Enlarged schematic diagram of the middle circle A;

[0020] Figure 3 for Figure 1 Enlarged schematic diagram of the middle circle B;

[0021] Figure 4 for Figure 1 Enlarged schematic diagram of the middle circle C;

[0022] Figure 5 Schematic diagram of the planar distribution of the fine grid lines of the fine grid screen of this application;

[0023] Figure 6 for Figure 5 Enlarged schematic diagram of the middle circle D;

[0024] Figure 7 for Figure 5 Enlarged schematic diagram of the middle circle E;

[0025] Figure 8 Schematic diagram of the superposition of the main grid screen and the fine grid screen of the printing screen of this application;

[0026] Figure 9 for Figure 8 Enlarged schematic diagram of the middle circle F;

[0027] Figure 10 for Figure 8 Enlarged schematic diagram of the middle circle G;

[0028] Figure 11 for Figure 8 Enlarged schematic diagram of the middle circle H;

[0029] Figure 12 Another partial schematic diagram of the busbars and connection point groups of the busbar grid plate of this application;

[0030] Figure 13 Another partial schematic diagram of the fine grid lines of the fine grid screen of the present application;

[0031] Figure 14 for Figure 12 and Figure 13 Schematic diagram of the superposition correspondence;

[0032] Figure 15 Another partial schematic diagram of the busbars and connection point groups of the busbar grid plate of this application;

[0033] Figure 16 Another partial schematic diagram of the fine grid lines of the fine grid screen of the present application;

[0034] Figure 17 for Figure 15 and Figure 16 Schematic diagram of the superposition correspondence;

[0035] Figure 18 Another partial schematic diagram of the busbars and connection point groups of the busbar grid plate of this application;

[0036] Figure 19Another partial schematic diagram of the fine grid lines of the fine grid screen of the present application;

[0037] Figure 20 for Figure 18 and Figure 19 Schematic diagram of the superposition. DETAILED DESCRIPTION

[0038] To facilitate understanding of the present application, a more comprehensive description of the present application will be provided below with reference to the accompanying drawings. The accompanying drawings illustrate preferred embodiments of the present application. However, the present 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 comprehensive understanding of the disclosure of the present application.

[0039] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be an element centered thereon. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an element centered thereon. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only implementations.

[0040] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are intended only to describe specific embodiments and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0041] The utility model discloses a main grid plate, which includes a carrier and a plurality of main grid lines and a plurality of connection point groups respectively arranged on the carrier. The plurality of main grid lines are arranged at intervals along a first direction, and the main grid lines include linear hollow main rods extending along a second direction. The plurality of connection point groups are arranged at intervals along the first direction, and the connection point groups include a plurality of through short lines arranged at intervals along the second direction. The linear hollow main rods and the through short lines are arranged at intervals. The linear hollow main rods and the through short lines are both arranged through the carrier, and the carrier is at least one or two metal layers stacked together. When printing the electrodes of solar cells, the problem of wire breakage during sintering or welding can be avoided, thereby ensuring the yield and quality stability and improving efficiency.

[0042] Furthermore, the width D1 of the through-line is in the range of 10 μm≤D1≤100 μm, the length L1 is in the range of 120 μm≤L1≤1200 μm, and the length direction thereof extends along the first direction. Preferably, the first direction is perpendicular to the second direction, and the through-line is perpendicular to the linear hollow main rod.

[0043] In one embodiment, at least one connection point group is provided between two adjacent bus bars, a connection point group is provided at the center of the two adjacent bus bars, or a connection point group is provided on one side or both sides of the bus bars.

[0044] In one embodiment, the through-line is in the shape of a rectangle, a waist-shaped hole, or a parallelogram. The through-line is linear in shape, and its length extends along the first direction. The through-line can be in the shape of a regular rectangle, waist-shaped hole, or parallelogram. In other embodiments, the through-line can also be in an irregular shape.

[0045] In one embodiment, the busbars and the connection point groups are alternately arranged at equal intervals. In a first direction, the busbars and the connection point groups are alternately arranged, and the distances between the busbars and the connection point groups are equal. In other embodiments, the busbars and the connection point groups are alternately arranged one by one, two by two, or two by one, and are arranged at equal intervals, equal intervals, or random intervals.

[0046] Furthermore, the main grid line also includes a plurality of gradient thorns distributed along the linear hollow main rod, the gradient thorns are perpendicular to the linear hollow main rod, the gradient thorns extend along the first direction, and the gradient thorns and the through-short lines are distributed on the same straight line.

[0047] Furthermore, the main grid line also includes a harpoon structure located at the end of the linear hollow main rod, the harpoon structure includes a welding base, two forked parts extending from the welding base, and a fishbone part located between the two forked parts, and the free end of the fork part extends with spaced whiskers.

[0048] Furthermore, the main grid line also includes a plurality of welding points distributed on the linear hollow main rod, and the welding points include welding plates and welding feet extending from the welding plates to both sides.

[0049] In one embodiment, the through-small short lines are symmetrically arranged on both sides of the linear hollow main rod, and the interval between the through-small short lines and the adjacent linear hollow main rods is in the range of 100 μm-800 μm.

[0050] In one embodiment, the through-line short line is arranged on one side of the linear hollow main rod, and the interval between the through-line short line and the adjacent linear hollow main rod is in the range of 200 μm-1000 μm.

[0051] The present application also discloses a fine grid screen, which includes a base layer and a plurality of fine grid lines arranged on the base layer, the fine grid lines extending along a first direction, and the plurality of fine grid lines are spaced apart in a second direction. The fine grid lines include a plurality of strip-shaped hollow portions spaced apart along the extension direction. The fine grid screen is used in conjunction with the main grid screen described above, wherein the strip-shaped hollow portions are cross-matched with the linear hollow main bars of the main grid screen, and the running short lines of the main grid screen are overlapped and matched with the adjacent strip-shaped hollow portions. The strip-shaped hollow portions of the fine grid screen and the linear hollow main bars of the main grid screen are not actually superimposed. The fine grid screen and the main grid screen are printed separately, and the fine grid electrodes printed on the fine grid screen and the main grid electrodes printed on the main grid screen are superimposed on the solar cell.

[0052] In one embodiment, the strip-shaped hollow portion is provided with a gradual width gradient. The gradient is provided at the ends, center, or predetermined locations of the strip-shaped hollow portion, specifically at locations where the width gradient aligns with the linear hollow main bars, penetrating short lines, gradient spikes, harpoon structures, and welding points of the busbar. This prevents wire breakage caused by sintering or welding when printing solar cell electrodes, improving yield, efficiency, and stability.

[0053] In one embodiment, the strip-shaped hollow portion includes slender strips and widened short strips. The widened short strips are arranged between adjacent slender strips and are spaced apart from the slender strips on at least one side. The widened short strips are cross-matched with the linear hollow main rod.

[0054] This application also discloses a printing screen, comprising a screen frame and a main grid screen or a fine grid screen, as described above, tensioned within the screen frame. The main grid screen and the fine grid screen avoid wire breakage caused by sintering or welding when printing electrodes for solar cells, thereby improving yield, efficiency, and stability.

[0055] Please refer to the following Figures 1 to 20 , the main grid screen, fine grid screen and printing screen assembly of the present invention are described with examples.

[0056] Please refer to Figures 1 to 4The utility model discloses a main grid plate 100, which includes a carrier (not shown) and a plurality of main grid lines 101 and a plurality of connection point groups 102 respectively arranged on the carrier. The plurality of main grid lines 101 are arranged at intervals along the first direction X, and the main grid line 101 includes a linear hollow main rod 1 extending along the second direction Y. The extension direction of the linear hollow main rod 1 is defined as the second direction Y, and the first direction X is arranged perpendicular to the second direction Y. The plurality of connection point groups 102 are arranged at intervals along the first direction X, and the connection point groups 102 include a plurality of through short lines 2 arranged at intervals along the second direction. The linear hollow main rod 1 and the through short lines 2 are arranged at intervals. The linear hollow main rod 1 and the through short lines 2 are both arranged through the carrier, and the carrier is at least one or two metal layers stacked together. When printing the electrodes of solar cells, the problem of wire breakage during sintering or welding can be avoided, thereby ensuring the yield and quality stability and improving efficiency.

[0057] In this embodiment, the through-line short lines 2 are rectangular in shape. The width D1 of the through-line short lines 2 is in the range of 10 μm ≤ D1 ≤ 100 μm, such as 10 μm, 30 μm, 50 μm, 80 μm, 100 μm, etc. The length L1 is in the range of 120 μm ≤ L1 ≤ 1200 μm, such as 120 μm, 150 μm, 300 μm, 600 μm, 800 μm, 1200 μm, etc., and the length direction thereof extends along the first direction X. The linear hollow main rod 1 is continuously arranged along the second direction Y, and the through-line short lines 2 are perpendicular to the linear hollow main rod 1.

[0058] In this embodiment, a connection point group 102 is provided between two adjacent bus bars 102. Specifically, a connection point group is provided at the center of two adjacent bus bars, and the bus bars 101 and the connection point groups 102 are alternately provided at equal intervals.

[0059] Furthermore, the main grid line 101 also includes a plurality of gradient thorns 31, a harpoon structure 32 and a plurality of welding points 33. The plurality of gradient thorns 31 are distributed along the linear hollow main rod 1, the gradient thorns 31 are perpendicular to the linear hollow main rod 1, the gradient thorns 31 extend along the first direction, the gradient thorns 31 and the through-short line 2 are distributed on the same straight line, the gradient thorns 31 are arranged with the width gradually decreasing from the linear hollow main rod 1 to both sides, and the gradient thorns 31 are symmetrically arranged with respect to the linear hollow main rod 1. The harpoon structure 32 is located at the end of the linear hollow main rod 1, and the harpoon structure 32 includes a welding base 321, two forks 322 extending from the welding base 321, and a fishbone portion 323 located between the two forks 322, and a whisker portion 324 extending from the free end of the fork 322. The welding points 33 are distributed on the linear hollow main rod 1 , and the welding points 33 include welding plates 331 and welding legs 332 extending from the welding plates 331 to both sides.

[0060] Please refer to Figures 5 to 7, the present application also discloses a fine grid screen 200, which is used in conjunction with the main grid screen 100. The fine grid screen 100 includes a base layer (not shown) and a plurality of fine grid lines 201 arranged on the base layer, the fine grid lines 201 extending along the first direction X, and the plurality of fine grid lines 201 are arranged at intervals in the second direction Y. The fine grid lines 201 include a plurality of strip-shaped hollow portions 4 arranged at intervals along the extension direction X, the strip-shaped hollow portions 4 are cross-matched with the linear hollow main rod 1 of the main grid screen 100 as described above, and the through short lines 2 of the main grid screen 100 are overlapped and matched with the adjacent strip-shaped hollow portions 4. In one embodiment, the strip-shaped hollow portion 4 is provided with a gradient section 41 with a gradual width setting. The gradient sections 41 are provided at the ends and the middle position of the strip-shaped hollow portion 41, that is, the width gradient setting at the locations matching the linear hollow main rod 1, the through short lines 2, the gradient thorns 31 and the welding points 33 of the main grid screen 100. The main grid plate 100 and the fine grid plate 200 avoid the problem of wire breakage caused by sintering or welding when printing electrodes of solar cells, thereby improving yield and efficiency and enhancing stability.

[0061] Please adopt Figures 8 to 11 The present application also discloses a printing screen 300, which includes a screen frame (not shown) and the main grid screen 100 or the fine grid screen 200 as described above, which is tensioned within the screen frame. The main grid screen 100 and the fine grid screen 200 avoid wire breakage caused by sintering or welding when printing the electrodes of solar cells, thereby improving yield and efficiency and enhancing stability. The main grid screen 100 of the printing screen 300 is used to print the main grid electrode, and the fine grid screen 200 is used to print the fine grid electrode. The main grid screen 100 and the fine grid screen 200 are matched to achieve the distribution and electrical connection of the main grid electrode and the fine grid electrode. The linear hollow main rod 1 of the main grid screen 100 is cross-matched with the strip hollow part 4 of the fine grid screen 200, and the short lines 2 running through the main grid screen 100 overlap and match the adjacent strip hollow parts 4, thereby avoiding the problem of broken wires in the printed main grid electrode and fine grid electrode, thereby improving the yield and efficiency and improving stability.

[0062] Please refer to Figure 12 and Figure 14The present application discloses another printing screen 400, which includes a screen frame and a main grid screen 401 or a fine grid screen 402 stretched within the screen frame. In this embodiment, the main grid screen 401 includes a linear hollow main bar 51 and a through small short line 52. The through small short line 52 is arranged adjacent to the linear hollow main bar 51. The through small short line 52 includes a first small short line 521 and a second small short line 522, which are respectively arranged on both sides of the linear hollow main bar 51. The first small short line 521 and the second small short line 522 are symmetrically arranged with respect to the linear hollow main bar 51. In other embodiments, the first small short line 521 and the second small short line 522 are different in at least one of the parameters such as length, width, distance from the linear hollow main bar 51, and position, thereby being arranged asymmetrically. The interval between the through small short line 52 and the linear hollow main bar 51 is in the range of 100μm-800μm. The strip-shaped hollowed-out portion 61 of the fine grid screen 402 includes thin strips 611 and widened short strips 612. The widened short strips 612 are arranged between adjacent thin strips 611 and spaced apart from the thin strips 611 on either side. The widened short strips 612 intersect and match the linear hollowed-out main rods 51, and the short lines 52 run through and overlap and match the adjacent thin strips 611 and widened short strips 612. The widened short strips 612 are wider than the thin strips 611, and the width of the thin strips 611 near the ends of the widened short strips 612 is gradually changed. This prevents disconnection of the printed main and fine gate electrodes, thereby improving yield, efficiency, and stability.

[0063] Please refer to Figure 15 and Figure 17 The present application discloses another printing screen 500, which includes a screen frame and a main grid screen 501 or a fine grid screen 502 stretched in the screen frame. In this embodiment, the main grid screen 501 includes a linear hollow main rod 53 and a running small short line 54. The running small short line 54 is arranged on one side of the linear hollow main rod 53, and the interval between the running small short line 54 and the adjacent linear hollow main rod 53 is in the range of 200μm-1000μm. The strip-shaped hollow portion 62 of the fine grid screen 502 includes a slender strip 621 and a widened short strip 622. The widened short strip 622 is arranged between adjacent slender strips 621 and is spaced apart from the slender strips 621 on one side. The widened short strip 622 crosses and matches the linear hollow main rod 53, and the running small short line 54 overlaps and matches the adjacent and spaced slender strips 621 and the widened short strip 622. The width of the widened short strip 622 is greater than the width of the thin strip 621. The thin strip 621 spaced apart from the widened short strip 622 has a gradually changing width near the end of the widened short strip 622, thereby avoiding the problem of broken wires in the printed main gate electrode and thin gate electrode, thereby improving yield and efficiency and improving stability.

[0064] Please refer to Figure 18 and Figure 20The present application discloses another printing screen 600, which includes a screen frame and a main grid screen 601 or a fine grid screen 602 stretched within the screen frame. Compared to the printing screen 500, in this embodiment, the main grid screen 601 includes a linear hollow main bar 55 and a through short line 56. The through short line 56 is arranged on the other side of the linear hollow main bar 55, and the interval between the through short line 56 and the adjacent linear hollow main bar 55 is in the range of 200μm-1000μm. The strip-shaped hollow portion 63 of the fine grid screen 602 includes a slender strip 631 and a widened short strip 632. The widened short strip 632 is arranged between adjacent slender strips 631 and is spaced apart from the slender strips 631 on the other side. The widened short strip 632 crosses and matches the linear hollow main bar 55, and the through short line 56 overlaps and matches the adjacent and spaced slender strips 631 and widened short strip 632. The width of the widened short strip 632 is greater than the width of the thin strip 631. The thin strip 631 spaced apart from the widened short strip 632 has a gradually changing width near the end of the widened short strip 632, thereby avoiding the problem of broken wires in the printed main gate electrode and thin gate electrode, thereby improving yield and efficiency and improving stability.

[0065] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail above with reference to the accompanying drawings. In the above description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described above, and those skilled in the art can make similar improvements without violating the connotation of the present application. Therefore, the present application is not limited to the specific embodiments disclosed above. In addition, the various technical features of the embodiments described above can be combined arbitrarily. In order to make the description concise, not all possible combinations of the various technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0066] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A main grid plate, characterized in that: It includes a carrier and several main grid lines and several connection point groups respectively arranged on the carrier, several of the main grid lines are arranged at intervals along the first direction, the main grid lines include linear hollow main rods extending along the second direction, several of the connection point groups are arranged at intervals along the first direction, the connection point groups include several through small short lines arranged at intervals along the second direction, and the linear hollow main rods and the through small short lines are arranged at intervals.

2. The main grid plate according to claim 1, characterized in that: The width D1 of the through short line is in the range of 10 μm≤D1≤100 μm, the length L1 is in the range of 120 μm≤L1≤1200 μm, and the length direction thereof extends along the first direction.

3. The main grid plate according to claim 1, characterized in that: At least one connection point group is provided between two adjacent main grid lines.

4. The main grid plate according to claim 1, characterized in that: The main grid lines and the connection point groups are alternately arranged at equal intervals.

5. The main grid plate according to claim 1, characterized in that: The through-small short lines are symmetrically arranged on both sides of the linear hollow main rod, and the interval between the through-small short lines and the adjacent linear hollow main rods is in the range of 100 μm to 800 μm.

6. The main grid plate according to claim 1, characterized in that: The through-going short line is arranged on one side of the linear hollow main rod, and the interval between the through-going short line and the adjacent linear hollow main rod is in the range of 200 μm-1000 μm.

7. A fine grid screen, characterized in that: It includes a base layer and a plurality of fine grid lines arranged on the base layer, the fine grid lines extend along a first direction, and the plurality of fine grid lines are arranged at intervals in a second direction; the fine grid lines include a plurality of strip-shaped hollow portions arranged at intervals along the extension direction; the fine grid plate is matched with the main grid plate described in any one of claims 1 to 6 for use.

8. The fine grid screen according to claim 7, characterized in that: The strip-shaped hollow portion is cross-matched with the linear hollow main rod of the main grid screen, and the penetrating short lines of the main grid screen are overlapped and matched with the adjacent strip-shaped hollow portion.

9. The fine grid screen according to claim 7, characterized in that: The strip-shaped hollow portion is provided with a gradient section with a gradually changing width.

10. The fine grid screen according to claim 7, characterized in that: The strip-shaped hollow portion includes a slender strip and a widened short strip. The widened short strip is arranged between adjacent slender strips and is spaced apart from the slender strip on at least one side. The widened short strip cross-matches with the linear hollow main rod.

11. A printing screen, characterized in that: The invention comprises a screen frame and a main grid screen plate according to any one of claims 1 to 6 or a fine grid screen plate according to any one of claims 7 to 10, which is tensioned in the screen frame.

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