Basic knowledge of PCB copper foil

- Nov 17, 2018-

Introduction to copper foil

Copper foil(Copper foil) : an cathodic electrolytic material deposited on a thin, continuous sheet of metal foil on the base of the PCB as a conductive material for PCB.It is easily bonded to an insulating layer, accepting a printed protective layer, and corroded to form a circuit pattern.Copper mirror test(Copper mirror test) : a solder caustic test using a vacuum deposition film on a glass plate. 

The copper foil is made of copper with a certain proportion of other metals. Generally, the copper foil is made of 90 and 88 kinds, that is, the copper content is 90% and 88%, and the size is 16*16cm.Copper foil is the most versatile decorative material.For example: the hotel hotel, the temple Buddha, the golden character sign, the tile Mosaic, the handicraft and so on. 

2. Product characteristics

Copper foil with low surface oxygen characteristics, can be attached with a variety of different base materials, such as metal, insulation materials, a wide range of temperature use.Mainly used in electromagnetic shielding and anti-static, conductive copper foil placed on the substrate surface, combined with metal substrate, has excellent conductivity, and provides the effect of electromagnetic shielding.Can be divided into: self-adhesive copper foil, double - conducting copper foil, single - conducting copper foil. 

Electronic grade copper foil thickness (more than 99.7% purity, 5 um um - 105) is one of the basic materials of the electronics industry fast development of electronic information industry, electronic grade copper foil usage is more and more big, the products are widely used in industrial use calculators, communications equipment, QA, lithium ion battery, civil TV, VCR, CD players, copy machine, telephone, air conditioning, automotive electronics, game consoles, etc.The demand for electronic grade copper foil, especially high-performance electronic grade copper foil, is increasing.By 2015, the domestic demand for electronic copper foil in China will reach 300,000 tons, and China will become the world's largest producer of printed circuit boards and copper foil bases. The market of electronic copper foil, especially high-performance foil, is promising. 

The global supply of copper foil

Industrial copper foil can be commonly divided into two categories: rolled copper foil (RA copper foil) and point-dissolved copper foil (ED copper foil). Rolled copper foil has good ductility and other characteristics, and is the copper foil used in the early soft plate manufacturing process, while electrolytic copper foil has the advantage of lower manufacturing cost than rolled copper foil.As calendered copper foil is an important raw material of soft sheet, so the improvement of its properties and price change have a certain impact on the soft sheet industry. 

As there are few manufacturers of rolled copper foil and some of them are technically in control, customers have a relatively low grasp of price and supply. Therefore, it is feasible to replace rolled copper foil with electrolytic copper foil on the premise that product performance is not affected.However, if the physical characteristics of the structure of copper foil will affect the etching factors in the next few years, the importance of calendering copper foil will be increased again in the fine line or thin type of products, and the high frequency products will be affected by telecommunications. 

The production of rolled copper foil has two major obstacles, resource barriers and technical barriers.Resource barrier means that the production of rolled copper foil needs to be supported by copper raw materials, and it is very important to occupy resources.On the other hand, technical hurdles have deterred more new entrants, as have surface or oxidation treatments, in addition to rolling.Most of the global companies have many technology patents and key technology Know How, which increases the entry barriers.If the new entrants adopt post-processing production and receive cost mussel from big factories, it is not easy for them to enter the market successfully, so the rolled copper foil in the world is still a strong monopolistic market. 

Development of copper foil

Copper foil for electrodepositedcopperfoil in English, is copper clad (CCL) and printed circuit board (PCB) manufacturing of important material.In today's rapid development of electronic information industry, electrolytic copper foil is called: electronic signal and power transmission, communication of the "neural network."Since 2002, the production value of printed circuit board in China has been ranked the 3rd in the world. As the substrate material of PCB, copper-clad board has also become the 3rd largest producer in the world.Therefore, China's electrolytic copper foil industry in recent years has a rapid development.In order to understand and understand the past, present and future of the development of electrolytic copper foil in the world and China, the expert of China epoxy resin industry association specially reviewed its development. 

From the perspective of the production department and market development and changes of electrolytic copper foil industry, its development process can be divided into three development periods: the first world copper foil enterprise established by the United States and the initial stage of electrolytic copper foil industry;The period when Japanese copper foil enterprises monopolized the world market.A time when the world was multipolar and competing for markets.