copper circuit board

copper circuit board

1. Introduction to copper foil

Copper foil: a cathodic electrolytic material, a thin, continuous metal foil deposited on the substrate of the circuit board, which serves as a conductor of the PCB. It is easy to adhere to the insulating layer, accept the printed protective layer, and form a circuit pattern after corrosion. Copper mirror test: a flux corrosion test, using a vacuum precipitated film on a glass plate.

Copper foil is made of copper and a certain proportion of other metals. Copper foil generally has two types: 90 foil and 88 foil, that is, the copper content is 90% and 88%, and the size is 16*16cm. Copper foil is the most widely used decorative material. Such as: hotel , temple Buddha statues, golden signs, tile mosaics, handicrafts, etc.

2. Product characteristics

Copper foil has low surface oxygen characteristics and can be attached to various substrates, such as metals, insulating materials, etc., and has a wide temperature range of use. Mainly used for electromagnetic shielding and antistatic, the conductive copper foil is placed on the substrate surface, combined with the metal substrate, with excellent conductivity and electromagnetic shielding effect.

It can be divided into: self-adhesive copper foil, double-conductor copper foil, single-conductor copper foil, etc.

Electronic grade copper foil (purity above 99.7%, thickness 5um-105um) is one of the basic materials of the electronics industry.

The electronic information industry is developing rapidly, and the use of electronic grade copper foil is increasing. The products are widely used in industrial calculators, communication equipment, QA equipment, lithium-ion batteries, civilian televisions, video recorders, CD players, copiers, telephones, air conditioners, automotive electronic components, game consoles, etc. The demand for electronic grade copper foil, especially high-performance electronic grade copper foil, is increasing in domestic and foreign markets. Relevant professional organizations predict that by 2015, China’s domestic demand for electronic grade copper foil will reach 300,000 tons, and China will become the world’s largest  base for printed circuit boards and copper foil. The market for electronic grade copper foil, especially high-performance foil, is promising.

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4.Development of copper foil

Copper foil is electrodeposited copper foil, which is the most important material for copper clad laminate (CCL) and printed circuit board (PCB).

In today’s rapid development of the electronic information industry, electrolytic copper foil is called: the “neural network” for electronic product signal and power transmission and communication.

Since 2002, the production value of printed circuit boards in China has entered the third place in the world, and copper clad laminate, as the substrate material of PCB, has also become the world’s third largest producer. As a result, China’s electrolytic copper foil industry has developed by leaps and bounds in recent years. In order to understand and know the past, present and future of the development of the electrolytic copper foil industry in the world and China, experts from the China Epoxy Resin Industry Association have reviewed its development.

From the perspective of the production layout and market development changes of the electrolytic copper foil industry, its development history can be divided into three major development periods: the period when the United States created the first world copper foil enterprises and the electrolytic copper foil industry started; the period when Japanese copper foil enterprises fully monopolized the world market; the period when the world multipolarized to compete for the market.

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5. Manufacturing process of copper circuit boards

The manufacturing process and application of circuit boards occupy an important position in the modern electronics industry. First of all, the manufacturing process of copper circuit boards involves several key steps. Initially, manufacturers choose high-quality substrates, such as glass fiber reinforced epoxy resin, which have good mechanical strength and electrical insulation properties. Next, the surface of the substrate will be covered with a thin layer of copper foil, which is usually achieved by calendering or electroplating. The thickness and uniformity of the copper foil directly affect the performance of the circuit board, so this link is crucial.

After the copper foil is covered with the substrate, the next step is pattern transfer. Through photolithography technology, the designed circuit pattern is transferred to the copper foil. Photolithography uses photosensitive materials and ultraviolet light to accurately depict circuit patterns on the surface of copper foil. Subsequently, the unprotected copper foil is removed through a chemical etching process, leaving only the required circuit pattern. At this point, the basic structure of the circuit board has been formed.

Next, the circuit board needs to be drilled and electroplated. Drilling is to create through holes on the circuit board, which are used to connect circuits between different layers. The electroplating process deposits a layer of conductive copper on the inner wall of the through hole and the surface of the circuit board to ensure the reliability of the electrical connection. The circuit board then goes through a series of cleaning and drying steps to remove residual chemicals and impurities.

After completing the above steps, the circuit board also needs to be surface treated. Common surface treatment methods include hot air leveling, chemical nickel-gold plating, and organic coating. These treatment methods can not only improve the corrosion resistance of the circuit board, but also enhance the welding performance. Finally, the circuit board will undergo rigorous quality testing, including electrical testing and appearance inspection, to ensure that it meets the design requirements and industry standards.

The application range of copper circuit boards is very wide. Due to their excellent electrical and thermal conductivity, copper circuit boards are widely used in computers, communication equipment, consumer electronics, automotive electronics, and industrial control. For example, in computer motherboards, copper circuit boards not only provide stable electrical connections, but also effectively dissipate heat to ensure the stable operation of the system. In automotive electronics, copper circuit boards are used to control systems and sensors, improving the safety and performance of vehicles.

In short, the manufacturing process of copper circuit boards is complex and delicate, and every step is crucial, directly affecting the performance and reliability of the final product. Its wide range of applications further proves the irreplaceable nature of copper circuit boards in the modern electronics industry. Through continuous technological innovation and process improvement, copper circuit boards will continue to play a key role in future electronic products.

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