One. Requirements for adjusting steel mesh:

The PCB surface and the steel mesh are cut flat, and the gap is the thickness of a piece of letter paper.

Two. Requirements of the screen printing process of the screen printing machine:

1. It is necessary to scrub the bottom of the screen every five screens, but avoid the corresponding part of the golden finger.

2. The solder paste running on both ends of the scraper should be adjusted once within half an hour, that is, under the scraper, to prevent the solder paste from rolling in half an hour.

3. The solder paste must adhere to the height of 1-1.5cm on the steel grid.

4. For products with BGA, it is necessary to scrub the PCB, that is, use cleaning water to clean the BGA prescription.

5. PCBs with good silk-screen printing should not accumulate too much, preferably 15 pcs.

6. The speed should be adjusted appropriately when the IC is screen printed for a small distance.