Method for removing wefts in harpoon position area of screen plate and manufacturing process of screen plate

Abstract

According to the method for removing the wefts in the harpoon position area of the screen, the wefts in the width area of the waist line groove in the harpoon position are removed, so that the width of the waist line groove, corresponding to the harpoon position area, of the screen cloth is reduced, the usage amount of slurry is reduced, and the screen printing cost is reduced. The method comprises the following steps of: performing laser cutting processing on waist line grooves on the mesh cloth according to the positions of two waist lines in a harpoon position area in advance, so that the mesh knot area of the tungsten wire mesh cloth corresponding to the areas of the two waist line grooves is completely exposed, and then identifying the waist line grooves in the harpoon position area through a high-precision camera; the obtained visual coordinate data are converted into laser coordinate data through laser and camera calibration, when laser cutting is conducted, the laser displacement module rapidly moves according to the positions of the wefts in the kidney-shaped groove area, the wefts between the positions of every two warps are cut off through laser, and the laser cutting is completed. Therefore, the latitude line corresponding to the waist line groove in the harpoon position area is cut and eliminated, and only the longitude tungsten filament is left.

Description

Technical Field

[0001] The invention relates to the technical field of solar screen printing, and in particular to a method for removing weft lines in a harpoon position area of ​​a screen. Background Art

[0002] Currently, the pattern is printed by screen printing, that is, a mesh woven from tungsten wire is used as a screen plate, and silver paste is used as a dye to print the pattern required on the solar panel onto the silicon panel.

[0003] In order to ensure that the printed pattern is clear, grooves need to be cut on the upper layer of the mesh to facilitate the slurry to flow through the grooves on the mesh along the mesh holes and then be printed on the silicon substrate.

[0004] During actual operation, a harpoon-shaped pattern needs to be printed on the silicon substrate. The harpoon-shaped pattern is the area corresponding to the two waistlines of the trapezoidal structure, and the two waistlines are flared oblique lines. During the production of the existing technology, since the waistline has a certain width and the corresponding mesh has multiple groups of knots, the knots are the intersections formed by the intersection of the warp and the weft. In order for the pattern obtained by silk screen printing to meet the design requirements, since there are material blocks at the knot positions, it is necessary to open a waistline groove in the harpoon position area on the mesh. There are two solutions in the existing technology. Solution 1: All areas corresponding to all knots in the waistline groove area are covered by calculation, and are set into multiple groups of fold line grooves; Solution 2: The width of the originally preset waistline is increased, so that the width of the waistline groove of the mesh in the harpoon position area is larger than the preset distance; regardless of which solution is used, the area corresponding to the waistline groove is larger than the area of ​​the preset waistline area. During the printing process, more slurry is required for silk screen printing.

[0005] In the actual silk screen printing process, the paste is silver paste, which is expensive, resulting in high production costs in the silk screen harpoon position area. Summary of the Invention

[0006] In response to the above problems, the present invention provides a method for removing the weft threads in the harpoon position area of ​​the screen, which removes the weft threads within the width area of ​​the waistline groove at the harpoon position, so that the width of the waistline groove of the mesh corresponding to the harpoon position area is reduced, and the waistline groove can be set according to the actual waistline shape, thereby reducing the use of slurry and lowering the screen printing cost.

[0007] A method for removing weft lines in a fish-tail position area of a screen plate, which is suitable for tungsten wire screen cloth of a silk screen printing screen plate, characterized in that: the screen cloth is subjected to laser cutting of waist line grooves according to the positions of two waist lines in the fish-tail position area, so that the screen knot area of the tungsten wire screen cloth corresponding to the two waist line groove areas is completely exposed, then the waist line grooves in the fish-tail position area are identified by a high-precision camera, the obtained visual coordinate data is converted into laser coordinate data through laser and camera calibration, and when laser cutting is performed, the laser displacement module quickly moves according to the positions of the weft lines in the waist groove area and cuts the weft lines between every two warp line positions by laser, so as to cut and eliminate the weft lines corresponding to the waist line grooves in the fish-tail position area, and only leave the warp tungsten wires.

[0008] It is further characterized in that: It comprises the following steps: S1, placing the silk screen printing screen plate in a laser processing equipment corresponding to a high-precision camera, the laser beam diameter of the laser processing equipment can be adjusted and set, and the coordinates of the high-precision camera and the displacement coordinates of the laser are pre-calibrated and converted; S2, importing the slot hole drawing of the screen cloth to be processed into the laser processing equipment, and then calibrating the screen cloth coordinates of the silk screen printing screen plate and the displacement coordinates of the laser; S3, setting the width of each group of waist line grooves in the fish-tail position area, then the laser processing equipment identifies the area covered by the waist line grooves of the screen cloth through the high-precision camera and accurately identifies all the weft tungsten wires covered by the waist line grooves; S4, converting the obtained visual coordinate data of the weft tungsten wires into laser coordinate data through laser and camera calibration; S5, the laser operation software converts the obtained laser coordinate data of each group of weft tungsten wires from points to lines, and obtains the line diameter of the laser; S6, the laser operation software cuts each weft tungsten wire by ultraviolet picosecond high energy, so as to cut and eliminate all the weft tungsten wires corresponding to the waist line grooves in the fish-tail position area, and leave the warp tungsten wires.

[0009] It is further characterized in that: In step S3, the high-precision camera identifies all the screen knots in the area covered by the waist line grooves, then identifies all the weft tungsten wires covered by the waist line grooves through the coordinates of adjacent screen knots, and accurately obtains the starting coordinate point and the end coordinate point of all the weft tungsten wires; In step S3, the width of the waist line groove is 50-200 μm; In step S6, the laser energy is 3-15 W, the laser moving speed is 50-500 mm / s, the line diameter of the laser beam is 10-50 μm, and the line diameter of the laser beam is set according to the distance between the two adjacent groups of warp lines, so as to ensure that all the weft lines in the set waist line groove area are cut and eliminated. In step S6, the laser path for removing the weft is carried out in a manner that the waistline groove areas on both sides are removed independently. The left waistline groove is completed in a serpentine route from top to bottom, and the right waistline groove is operated in a serpentine route from bottom to top following the laser position of the left waistline groove, thereby improving the efficiency of laser removal of the weft.

[0010] After adopting the present invention, before the tungsten wire mesh is compounded with the mesh cloth, all the weft threads corresponding to the mesh knots in the waistline groove of the preset harpoon position area of ​​the tungsten wire mesh are removed by laser, so that the waistline groove corresponding to the mesh cloth is reasonably set according to the design size without the need for additional widening, thereby reducing the width of the slurry during each printing, thereby reducing the amount of slurry used in a single printing, saving slurry costs, and since the slurry is silver paste, it greatly reduces the cost of silk screen printing. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 A schematic diagram of the removed weft and waistline positions in the harpoon position area of ​​the mesh of the present invention; Figure 2 Schematic diagram of the range of the mesh of the present invention corresponding to the waistline groove (green frame selection area); Figure 3 for Figure 2 A partially enlarged schematic diagram of the figure, where the × part indicates the weft line that needs to be removed. DETAILED DESCRIPTION

[0012] A method for removing weft threads in a harpoon position area of ​​a screen, which is applicable to tungsten wire mesh for screen printing screens: the mesh is pre-processed with laser cutting of the waistline grooves according to the two waistline positions of the harpoon position area, so that the mesh knot areas of the tungsten wire mesh corresponding to the two waistline grooves are completely exposed. A high-precision camera is then used to identify the waistline grooves in the harpoon position area, and the obtained visual coordinate data is converted into laser coordinate data through laser and camera calibration. During laser cutting, a laser displacement module moves rapidly according to the positions of the weft threads in the waistline groove area, and cuts off the weft threads between every two warp threads by laser, thereby eliminating the weft threads corresponding to the waistline grooves in the harpoon position area and leaving only the warp tungsten threads.

[0013] The method comprises the following steps: S1, placing a screen printing plate in a laser processing device corresponding to a high-precision camera, wherein the laser beam line diameter of the laser processing device can be adjusted, and the coordinates of the high-precision camera and the displacement coordinates of the laser are pre-calibrated and transformed; S2. Import the slot hole drawing of the mesh to be processed into the laser processing equipment, and then calibrate the mesh coordinates of the screen printing screen and the displacement coordinates of the laser; S3. The width of each group of waistline grooves in the harpoon position area is set separately. Then, the laser processing equipment uses a high-precision camera to identify the area of ​​the mesh covered by the waistline grooves and accurately identify all the weft tungsten filaments covered by the waistline grooves; wherein the width of the waistline grooves is 50μm to 200μm; the high-precision camera identifies all the mesh knots in the area covered by the waistline grooves, and then identifies all the weft tungsten filaments covered by the waistline grooves through the coordinates of adjacent mesh knots, and accurately obtains the starting coordinate points and end coordinate points of all the weft tungsten filaments; S4, converting the obtained visual coordinate data of the weft tungsten wire into laser coordinate data through laser and camera calibration; S5. The laser operating software converts the laser coordinate data of each set of weft tungsten wires from points to lines to obtain the laser line diameter; S6. The laser operating software uses ultraviolet high energy to cut the weft tungsten wires one by one, thereby eliminating all the weft tungsten wires corresponding to the waistline groove in the harpoon position area and leaving only the warp tungsten wires; The laser energy is 3-15W, the laser moving speed is 50mm-500mm / s, and the laser beam diameter is 10-50 microns. The laser beam diameter is set according to the distance between two adjacent groups of warp threads to ensure that all the weft threads in the set waistline groove area are cut off. The laser removal path for the weft is carried out in a manner that the waistline groove areas on both sides are removed independently. The left waistline groove is completed in a serpentine route from top to bottom, and the right waistline groove follows the laser position of the left waistline groove and operates in a serpentine route from bottom to top, thereby improving the efficiency of laser removal of the weft.

[0014] Before the tungsten wire mesh is laminated with the mesh, all the weft lines corresponding to the mesh knots in the waistline groove of the preset harpoon position area of ​​the tungsten wire mesh are removed by laser, so that the waistline groove corresponding to the mesh is reasonably set according to the design size without the need for additional widening, thereby reducing the width of the slurry during each printing, thereby reducing the amount of slurry used in a single printing and saving slurry costs. Since the slurry is silver paste, it greatly reduces the cost of screen printing.

[0015] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0016] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A method for removing weft threads in the harpoon position area of ​​a screen, suitable for tungsten wire mesh used in screen printing screens, characterized by: The waistline grooves of the mesh are laser cut in advance according to the two waistline positions of the harpoon position area, so that the mesh knot areas of the tungsten wire mesh corresponding to the two waistline grooves are completely exposed. Then the waistline grooves in the harpoon position area are identified by a high-precision camera, and the obtained visual coordinate data is converted into laser coordinate data through laser and camera calibration. During laser cutting, the laser displacement module moves quickly according to the position of the weft in the waistline groove area, and cuts off the weft between every two warp positions by laser, thereby eliminating the weft corresponding to the waistline groove in the harpoon position area and leaving only the warp tungsten wire.

2. A method for removing the weft of the harpoon position area of ​​the screen according to claim 1, characterized in that: The method comprises the following steps: S1, placing a screen printing plate in a laser processing device corresponding to a high-precision camera, wherein the laser beam line diameter of the laser processing device can be adjusted, and the coordinates of the high-precision camera and the displacement coordinates of the laser are pre-calibrated and transformed; S2. Import the slot hole drawing of the mesh to be processed into the laser processing equipment, and then calibrate the mesh coordinates of the screen printing screen and the displacement coordinates of the laser; S3. The width of each set of waistline grooves in the harpoon position area is set separately. Then, the laser processing equipment uses a high-precision camera to identify the area of ​​the mesh covered by the waistline grooves and accurately identify all the weft tungsten wires covered by the waistline grooves; S4, converting the obtained visual coordinate data of the weft tungsten wire into laser coordinate data through laser and camera calibration; S5. The laser operating software converts the laser coordinate data of each set of weft tungsten wires from points to lines to obtain the laser line diameter; S6. The laser operating software uses ultraviolet high energy to cut the weft tungsten wires one by one, thereby eliminating all the weft tungsten wires corresponding to the waistline groove in the harpoon position area and leaving the warp tungsten wires.

3. A method for removing wefts in the harpoon position area of ​​a mesh plate according to claim 2, characterized in that: In step S3, the high-precision camera identifies all the mesh knots in the area covered by the waistline groove of the mesh cloth, and then identifies all the weft tungsten wires covered by the waistline groove through the coordinates of adjacent mesh knots, and accurately obtains the starting coordinate points and end coordinate points of all the weft tungsten wires.

4. The method for removing the weft of the harpoon position area of ​​the screen according to claim 2, characterized in that: In step S3 , the width of the waistline groove is 50 μm to 200 μm.

5. The method for removing the weft in the harpoon position area of ​​a mesh plate according to claim 2, characterized in that: In step S6, the laser energy is 3 to 15 W, the laser moving speed is 50 mm to 500 mm / s, the laser beam line diameter is 10 to 50 microns, and the laser beam line diameter is set according to the distance between two adjacent groups of warp threads to ensure that all the weft threads within the set waistline groove area are cut and eliminated.

6. The method for removing the weft in the harpoon position area of ​​a mesh plate according to claim 2, characterized in that: In step S6, the laser path for removing the weft is carried out in a manner that the waistline groove areas on both sides are removed independently. The left waistline groove is completed in a serpentine route from top to bottom, and the right waistline groove is operated in a serpentine route from bottom to top following the laser position of the left waistline groove, thereby improving the efficiency of laser removal of the weft.

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