Paste bar for screen printing and method of use thereof

Abstract

The invention discloses a paste retaining bar for screen printing, which comprises a pair of vertical end surfaces, a flat bottom surface and a paste blocking surface obliquely placed directly above the bottom surface; the paste blocking surface is composed of a pair of inclined surfaces. Using the slurry bar of the invention during screen printing can make the slurry more evenly distributed, and can improve the process precision, uniformity and stability of screen printing.

Description

technical field [0001] The invention relates to the technical field of screen printing, in particular to a paste bar for screen printing and a method for using the same. Background technique [0002] The screen printing machine mainly includes: printing head (including scraper, ink return knife), printing table, screen frame and so on. The screen plate is fixed on the screen frame, the screen plate is squeezed and deformed by the scraper, and the slurry on the screen plate is extruded out of the pattern, and then the slurry scraped by the scraper is scraped back to the original position by the ink return knife, and this is done once printing process. [0003] Such as figure 1 As shown, in the case of long-term multi-batch printing, due to the deformation of the screen plate by the scraper, the screen plate will have a low middle part and a height difference on both sides, and the slurry is fluid. The slurry will flow slowly from the high position to the low position, resu...

AI Technical Summary

Problems solved by technology

[0003] like figure 1 As shown, in the case of long-term multi-batch printing, due to the deformation of the screen plate by the scraper, the screen plate will have a low middle part and a height difference on both sides, and the slurry is fluid. The slurry will flow slowly from the high position to the low position, resulting in more and more slurry in the middle of the screen, and less and less slurry on both sides of the screen. In the case of less material, when the scraper is pushed forward again, more paste will be squeezed out in the middle of the screen, and relatively less paste will be squeezed out on both sides of the screen, which will affect the uniformity of printing.

[0004] Taking screen printing technology in the photovoltaic industry as an example, screen printing in the photovoltaic industry has high requirements for printing accuracy, uniformity, and continuity. If printing metal electrodes, uneven paste will affect current collection. Miscellaneous paste, uneven printing will lead to uneven doping square resistance, and large differences in junction depth and concentration in different regions

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