Scraper for screen printer

Abstract

The invention discloses a scraper for a screen printer. The flat bottom contact surface of a scraper body on one side in contact with a screen is improved into a curved surface which recesses towards inside of the body. When the scraper is used for scraping, the scraper generates a certain pressure applied on the screen, so the screen generates the same reaction force applied to the scraper simultaneously. As the contact surface of the scraper is an inwards recessed curved surface, the scraper body also suffers an own resilience force. The reaction force at two ends of the scraper body is greater than that in the middle part of the scraper body, and the own resilience force applied at the two ends of the scraper body is smaller than that in the middle part of the scraper body, so that the scraper body is uniformly stressed integrally. Therefore, the contact surface of the scraper is deformed, and the contact surface of the scraper is changed from an inwards recessed curved surface to a flat surface, so that the contact part of the screen and the contact surface of the body is basically kept horizontal, and finally screen-printed Al-back surface field has uniform thickness.

Description

technical field [0001] The invention relates to a screen printing tool, in particular to a scraper used on a screen printing machine. Background technique [0002] The electrode line (grid line) on the front side of the silicon solar cell is used to collect the free electrons generated by the silicon solar cell, and the aluminum back field on the back side of the silicon solar cell is used to form the P+ on the back side. The electrode lines on the front side of the silicon solar cell and the aluminum back field on the back are usually printed with conductive pastes such as silver and aluminum by a screen printing machine, and then dried and sintered to form the silver grid lines and the aluminum back field. At present, commonly used screen printing machines such as figure 1 and figure 2 as shown ( figure 1 and figure 2 Only part of the structure is given), which includes a printing seat 1, a silicon substrate seat 2 placed under the printing seat 1 and used to place a...

AI Technical Summary

Problems solved by technology

After long-term use of the squeegee of the above-mentioned screen printing machine, the relevant staff found that the thickness of the printed aluminum back field was uneven, that is, the middle part of the aluminum back field along the squeegee direction was thinner, while the two sides were thicker, which seriously affected the quality of the aluminum back field. Quality of Silicon Solar Cells

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