What is a copper board PCB?


April 27, 2024

copper board pcb(1)

Copper board PCB is a commonly used circuit board that plays an important role in electronic devices. It comprises several parts, such as substrate, copper foil, anti-etch layer, and printing ink. The substrate is the main body of the circuit board, usually, a glass fiber plate; copper foil is the conductive part of the circuit board, copper foil thickness is generally 0.01 ~ 0.05mm; an etch-resistant layer is used to prevent the copper foil from is oxidized, generally made of chemical chrome plating; printing ink is used to print circuit patterns and text.

The difference between copper board PCB and ordinary-printed circuit boards?

Copper board PCBs are composite materials consisting of a non-conductive substrate (such as FR4) and one or more layers of copper foil. The copper foil is often covered on one or both sides of the non-conductive substrate and is used for conductive connections. A PCB, on the other hand, is a composite material with conductive paths, usually consisting of a non-conductive substrate and layers of wires formed chemically or mechanically.

Advantages of copper board PCB:

  • Plating and etching result in straight sidewalls and negligible bottoms.
  • Increased copper thickness in PTH and sidewalls.
  • Increased current conductivity range.
  • Potentially smaller board size from delamination.
  • Increases strength of connection areas.
  • Heat transfer to external radiators.
  • Increased mechanical strength of joint parts and PTH holes
  • Increase resistance to thermal strain.
  • Increase onboard high power density planar transformers.

copper board pcb(2)Fabrication process for copper board PCB

  • The circuit pattern is fabricated: Firstly, the circuit schematic is created by optoelectronic drawing software and output on a transparent film, and then the film is laminated to the copper plate. Next, the desired circuit pattern is produced on the copper plate through process steps such as ultraviolet exposure and etching.
  • Preparation of the copper plate: The surface of the copper plate is usually sprayed with a photo-polymerized adhesive and exposed according to the circuit pattern. After exposure, the photopolymer is removed by a chemical solution, which exposes the surface of the copper plate and creates the circuit pattern.
  • Printing technology: During the fabrication of a printed circuit board, the circuit pattern can be printed on the copper plate through printing techniques. This typically includes methods such as screen printing, inkjet printing, and inkjet printing. For example, screen printing utilizes a printing screen to print a conductive ink paste onto the surface of the board, which is then dried to form the circuit pattern.
  • The etching method: Finally, the printed circuit board is put into a chemical solution for chemical etching. Unwanted portions will be etched away, while the desired portions are retained to form the final circuit board.
    These steps work together to form the desired circuit structure on the copper board PCB, realizing the connection of electronic components and operational devices, etc. Finally to form a circuit.

Precautions for Copper Board PCB Production

  1.  When designing the circuit pattern, you need to consider the stability and reliability of the circuit.
  2.  When making the substrate, you need to pay attention to the selection of materials and processing technology to achieve the desired results.
  3. When attaching the copper foil, it is necessary to ensure that the copper foil is firmly attached to prevent offsetting or peeling.
  4. When making the corrosion protection layer, it is necessary to pay attention to the concentration of the corrosion inhibitor and the uniformity of the coating, to achieve the best protective effect.
  5. when printing ink, need to pay attention to the printing volume and printing precision, to ensure that the circuit pattern and text are visible.

Why us?

Compared with ordinary PCB, thick copper PCB has higher conductivity and mechanical strength, and can meet the requirements of high current, high voltage, and high mechanical stress. Due to its good mechanical strength and conductivity, thick copper PCB has a wide range of applications in power supply circuits, such as conventional power supply circuits, high-speed digital power supply circuits, high-power electronic equipment, and automotive electronics, with the continuous development of electronic technology, the application of thick copper PCB will be even more broad prospects. Why choose LHD? We provide customers with a full range of one-stop services, including technical support, product maintenance, etc., to provide customers with a more complete service experience. One-time cooperation is not our goal.


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