CN209920717U

CN209920717U - Solar cell steel screen printing device

Info

Publication number: CN209920717U
Application number: CN201920008047.0U
Authority: CN
Inventors: 瞿辉; 曹玉甲; 张强
Original assignee: Jiangsu Shunfeng Photovoltaic Technology Co Ltd
Current assignee: Changzhou Shunfeng Solar Energy Technology Co ltd
Priority date: 2019-01-03
Filing date: 2019-01-03
Publication date: 2020-01-10
Anticipated expiration: 2029-01-03

Abstract

The utility model relates to a solar cell steel screen printing device, which comprises two printing head cylinders, wherein the two printing head cylinders are symmetrically arranged and are connected with a printing head and a scraper; the printing head and the scraper are arranged above the steel screen plate, and the printing angle between the scraper and the steel screen plate is 50-80 degrees; the steel screen plate is composed of a plurality of ink-impermeable strip-shaped steel plates, and ink-permeable grid line openings are reserved among the strip-shaped steel plates. The utility model solves the problem of printing thick dot lines and increases the printing yield; the steel screen plate can be matched to effectively increase and decrease the height-width ratio of the grid line, reduce the printing line width and increase the printing line height.

Description

Solar cell steel screen printing device

Technical Field

The utility model belongs to the technical field of the solar cell technique and specifically relates to a solar cell steel mesh version printing device.

Background

The traditional solar cell printing adopts a screen printing mode, as shown in figures 1 and 2, when the device normally works, the whole device runs in the ink returning direction by ascending a printing head cylinder and descending an ink returning blade cylinder according to the figure 1, and slurry is uniformly spread on a screen printing plate to cover the grid line opening. Then, as shown in fig. 2, the printing head cylinder is lowered, the ink return blade cylinder is raised, the whole device runs according to the printing direction, the slurry spread on the openings of the grid lines is squeezed into the openings of the grid lines through the scraper, the slurry is contacted with the silicon wafer and is adhered to the silicon wafer, meanwhile, the screen printing plate is lifted to be away from the silicon wafer, and the slurry is printed on the silicon wafer. This is a complete printing process. Fig. 3 is an enlarged view of a portion of the openings in the grid lines of a screen wherein the paste is permeable through the stainless steel wire mesh openings and the remaining areas are impermeable to ink. (dark areas are coated with emulsion, which areas are not ink permeable). Therefore, when screen printing is used, the aperture opening ratio of the grid line is not 100%, the slurry can be hindered by the stainless steel wire in the process of penetrating, the permeability of the slurry is influenced, the height of the printing line is influenced, and even printing broken grid (the slurry in the area can not penetrate) can be caused in serious cases.

In order to increase the ink permeability of printing, the appearance of a printing grid line is optimized (the printing line is thinner, the height of the grid line is higher), a steel screen is generated, as shown in fig. 4, it can be seen that nothing is blocked in the opening of the grid line, the opening rate reaches 100%, when the steel screen is used for printing, slurry with higher viscosity than that of conventional slurry needs to be matched, otherwise, the slurry viscosity is lower, and the line width of the printed grid line is increased due to the fluidity of the slurry. The steel screen plate uses high-viscosity slurry, so that the line width increase caused by slurry flowing is not needed to be worried about, and the screen plate is not needed to be worried about that the slurry cannot penetrate through the screen plate because the aperture ratio of the grid line of the steel screen plate is 100%. If the common screen mesh is matched with the high-viscosity slurry, the fluidity of the slurry is not enough and is blocked by the stainless steel wire, so that the slurry cannot penetrate through the screen plate, and the broken grid is caused. However, for the steel plate mesh, because the aperture opening ratio of the grid lines is 100%, in the ink returning process, when the paste is spread on the openings of the grid lines, a part of the paste penetrates into the openings, and then in the printing process, the paste which firstly penetrates into the openings is extruded out, so that thick lines are printed in the area, the appearance is poor, and the high quality ratio is affected.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: the utility model provides a solar cell steel screen version printing device can effectively solve thick dotted line problem when steel screen version is printed.

The utility model provides a technical scheme that its technical problem adopted is: a solar cell steel screen printing device comprises two printing head cylinders, wherein the two printing head cylinders are symmetrically arranged and are connected with a printing head and a scraper; the printing head and the scraper are arranged above the steel screen plate, and the printing angle between the scraper and the steel screen plate is 50-80 degrees; the steel screen plate is composed of a plurality of ink-impermeable strip-shaped steel plates, and ink-permeable grid line openings are reserved among the strip-shaped steel plates.

Furthermore, the scraper used for printing cannot use a traditional glass fiber scraper, because the edge of the opening of the grid line of the steel screen plate is very sharp, if a common glass fiber scraper is used, the service life is very short, and the appearance uniformity of the printed grid line is poor; the scraper of the utility model is a steel sheet, the thickness of the steel sheet is 0.2-0.3 mm, the length of the steel sheet is greater than that of the silicon wafer, generally 180-200 mm; the service life of the scraper is far longer than that of a common glass fiber scraper, and the uniformity of the printed grid line is better.

Still further say, scraper symmetry set up, the distance of the minimum of the scraper of two symmetries is no longer than 100 mm.

Still further say, the scraper set up in the rear of print head.

Still further say, the grid line opening be the bar.

The utility model has the advantages that:

1. the problem of printing thick dot lines is solved;

2. increase the yield of printing;

3. the steel screen plate can be matched to effectively increase and decrease the height-width ratio of the grid line, reduce the printing line width and increase the printing line height.

Drawings

Fig. 1 is a schematic structural diagram of the state of ink return in the current solar cell printing process, in which a scraper-1, an ink return knife-2, a printing head cylinder-3, an ink return knife cylinder-4, rolling slurry-5, returned slurry-6, a screen-7 and grid line openings-8 are provided.

Fig. 2 is a schematic structural diagram of a state of printing in the current solar cell printing process, wherein a scraper-1, an ink return knife-2, a printing head cylinder-3, an ink return knife cylinder-4, rolling slurry-5, returned slurry-6, a screen-7 and grid line openings-8 are arranged in the diagram.

Fig. 3 is a partially enlarged view of the openings of the grid lines of the screen printing plate, wherein the openings are stainless steel wires-9 and stainless steel wire meshes-10.

Fig. 4 is an enlarged view of a portion of the grid line openings of the screen printing plate, showing the ink impermeable stainless steel plate-11, and the ink permeable grid line openings-12.

FIGS. 5-6 are schematic structural views of the present invention; in the figure, a scraper-1, a printing head cylinder-3, rolling slurry-5, recovered slurry-6, a screen-7 and grid line openings-8 are shown.

Detailed Description

The invention will now be described in further detail with reference to the drawings and preferred embodiments. These drawings are simplified schematic drawings and illustrate the basic structure of the present invention only in a schematic manner, and thus show only the components related to the present invention.

As shown in fig. 5 to 6, a solar cell stencil printing apparatus includes 2 print head cylinders 3 and two printing blades 1, and compared with a conventional printing apparatus, an ink returning apparatus is removed and changed into a print head symmetrical to an original print head. Because the aperture opening ratio of the steel screen plate is 100 percent, the ink returning process is not needed like the traditional printing, and the printing can be directly carried out.

The operation steps are as follows:

first, slurry is added to the steel screen plate, and as shown in fig. 5, the left print head 3 is raised, the right print head 3 is lowered, and the whole apparatus is operated from right to left. Grid line opening 8 is filled up with thick liquids 5 directly through scraper 1, simultaneously through 1 pressure of scraper, extrudes the mesh with thick liquids 5, and thick liquids and silicon chip contact glue on the silicon chip, and the steel screen version lifts up at last, and thick liquids break away from completely in grid line opening 8 promptly, and printing from right side to left has already been accomplished, and a slice silicon chip has already printed.

Secondly, another unprinted silicon wafer is transported to the printing table again, and then as shown in fig. 6, the right printing head 3 is lifted, the left printing head 3 is lowered, and the whole device runs from left to right. The printing state of step two is identical to that of step one because the ink-returning process is absent and the gate line openings 8 are 100%, and the paste in the gate line openings has been completely printed on the silicon wafer in step one. Grid line opening is filled up with thick liquids through the scraper, simultaneously through scraper pressure, extrudes the mesh with thick liquids, and thick liquids and silicon chip contact glue on the silicon chip, and the steel screen plate lifts up at last, and thick liquids break away from completely in following the grid line opening promptly, and the printing from a left side to the right has also been accomplished, and another silicon chip has also printed and has been accomplished.

In conclusion, the printing of the two battery pieces is completed in the first step and the second step, and the printing yield is increased.

The sequence of the first step and the second step is not sequential, and the first step can be from left to right or from right to left.

Wherein the thickness of the steel sheet scraper used for printing is 0.25mm, and the length is 190 mm;

wherein, the distance between the lowest point and the lowest point of the two symmetrical scrapers is 80 mm.

Wherein the printing angle between the scraper and the steel plate net is 70 degrees.

While the foregoing is directed to embodiments of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.

Claims

1. The utility model provides a solar cell steel screen version printing device which characterized in that: the printing device comprises two printing head air cylinders, wherein the two printing head air cylinders are symmetrically arranged and are connected with a printing head and a scraper; the printing head and the scraper are arranged above the steel screen plate, and the printing angle between the scraper and the steel screen plate is 50-80 degrees; the steel screen plate is composed of a plurality of ink-impermeable strip-shaped steel plates, and ink-permeable grid line openings are reserved among the strip-shaped steel plates.

2. The solar cell screen printing apparatus of claim 1, wherein: the scraper is a steel sheet, the thickness of the steel sheet is 0.2-0.3 mm, and the length of the steel sheet is greater than that of the silicon wafer.

3. The solar cell screen printing apparatus of claim 1, wherein: the scrapers are symmetrically arranged, and the distance between the lowest points of the two symmetrical scrapers is not more than 100 mm.

4. The solar cell screen printing apparatus of claim 1, wherein: the scraper is arranged behind the printing head.

5. The solar cell screen printing apparatus of claim 1, wherein: the grid line opening is strip-shaped.