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By Ginkgoem | 19 February 2021 | 0 Comments

Factors affecting the printing quality of automatic solder paste printers

Factors affecting the printing quality of automatic solder paste printers
1. Scraper pressure
The squeegee pressure is small, and the solder paste cannot be effectively deposited on the pad through the stencil opening. If the pressure is too high, the solder paste printed on the pad will be very thin. Therefore, the squeegee pressure needs to be set properly and not too soft or hard.      

2. Squeegee printing speed
The solder paste is printed on the pad with too much tin, little tin, too thick and too thin. In addition to the squeegee pressure, it is the printing speed. Appropriately reduce the squeegee printing speed. Generally, the squeegee speed is set between 20-80mm/s.
3. The width of the scraper
The width of the squeegee is also a factor in the impression of poor solder paste printing. If the squeegee is too narrow, some solder paste may not leak to the pad. If the width of the squeegee is too wide, it may cause the flatness of the solder paste printing and the thickness of the solder paste to decrease.

4. The angle between the scraper and the steel mesh
The angle between the squeegee and the stencil is another aspect that affects printing. The large angle of the squeegee will result in high squeegee pressure, thin solder paste printing, and small included angle, resulting in low squeegee pressure and thick solder paste printing, which is common in the industry. Set the angle between the squeegee and the steel mesh between 45 and 60 degrees, and the printing quality will be relatively best.

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