PCB News - Screen printing technology of circuit board factory

Screen printing technology of circuit board factory

The solder mask for circuit board manufacturers is a thin lacquer-like polymer layer that is usually applied to copper traces on printed circuit boards (PCBs) to prevent oxidation and prevent solder bridges from forming between closely spaced pads. The solder mask is not always used for manual soldering of components, but it is essential for mass-produced circuit board factory (Shenzhen circuit board factory) boards that use reflow soldering or solder bath technology to automatically solder, and it is traditionally green Yes, but now there are many colors to choose from. The following is the process of screen printing technology, as follows:

1. Surface cleaning: Use alcohol to clean the stains on the plexiglass surface of the screen printing machine.

2. Fix the screen frame: Fix the screen frame on the screen printing machine and tighten it with the fixed knob.

3. Preliminary positioning: adjust the position of the PCB of the circuit board factory to make the position of the hole on the PCB consistent with the position of the corresponding hole on the silk screen frame.

4. Adjust the position slightly: turn on the alignment light source, adjust the X/Y/Z direction to adjust the PCB position, so that the pattern on the PCB of the circuit board factory (Shenzhen Circuit Board Factory) is exactly the same as the pattern on the silk screen frame.

5. Scratch ink: The staff of the circuit board factory (Shenzhen circuit board factory) is evenly coated with a layer of screen printing ink on the graphic area, scraping with one hand and pressing the screen frame with the other, and then scraping 45 by using a scraper.

Screen printing is a printing technique in which a mesh is used to transfer ink to a substrate, except for areas that are impermeable to ink by blocking the template. Print one color at a time, so the PCB factory (Shenzhen PCB Factory) can use multiple screens to produce multi-color images or designs.

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