The process of etching PCBs using an etching machine is a precise and multi-step flow

1、Designing the PCB Layout:

• Using CAD software, the PCB layout is designed based on the circuit design requirements.

• During the design process, factors such as the routing, width, spacing, and positions of pads are considered to ensure the PCB meets the intended needs.

  
  

2、Creating the Photoresist Film:

• A photoresist film is applied to the base material of the PCB.

• The PCB layout is placed on the photoresist film, and through exposure and development processes, a photoresist pattern is formed.

• The photoresist film serves to protect the areas that are not to be etched, allowing for accurate etching of the desired patterns.

  
  

3、Acid Washing and Cleaning:

• The photoresist-treated PCB is placed in an acid solution for cleaning.
  

• This step removes surface oxides and impurities, ensuring smooth etching in the subsequent steps.

  
  

4、Etching Process:

• The photoresist-treated and acid-cleaned PCB is then placed in an etching machine.
  

• The etching machine uses a chemical solution to etch away the unwanted areas.

• During the etching process, the etching time and temperature are carefully controlled to ensure precision and consistency.

• The chemicals in the etching solution react with the copper on the PCB, dissolving the uncovered copper to create the desired circuit patterns.

5、Removing the Photoresist:

• After etching, the PCB is placed in a photoresist removal solution.

• This step removes the residual photoresist, leaving a clean PCB surface.

• The PCB is then dried to ensure a dry surface.

  
  

6、Inspection and Repair:

• The etched and cleaned PCB is inspected for any defects.

• The integrity of the circuits and the quality of the pads are checked, and any issues are promptly repaired.

7、Surface Treatment:

• The PCB undergoes surface treatments such as anti-oxidation coating or tin spraying.

• These treatments protect the PCB surface and enhance its soldering performance.

In the entire PCB etching process, the etching machine is a crucial piece of equipment. It utilizes precise control systems and transmission mechanisms, along with chemical etching techniques, to achieve high-precision PCB processing. Strict control of parameters and quality throughout the process ensures the stability and quality of the PCB.