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Basic knowledge of the PCB copper foil

First, the introduction of copper foil

Copper foil: a electrolytic material, a thin and continuous metal foil precipitated on the circuit board base layer, it is the PCB conductive body.It’s easy to glue in insulating layer, accept printing layer, forming circuit pattern after etching. Copper mirror test (bronze) : a flux corrosion test, use a vacuum deposition film on glass plate.

Copper foil is made from copper and a percentage of the other metal. It generally has two kinds:copper foil 90 and copper foil 88 , namely the copper content of 90% and 88%,and the size is 16 * 16 cm.Copper foil is the most versatile decorative materials. Such as: hotels, the monastery of Buddha, golden signboard, ceramic tile, Mosaic, arts and crafts, etc.

Second, the product features

Copper foil has low surface oxygen features. It can be attached to a variety of different base material, such as metal, insulation materials, etc., and it has a wide temperature range.Tt is mainly used in electromagnetic shielding and antistatic. Put conductive copper foil in the substrate surface, combined with the metal base material.It has excellent guide (ecis) and providse the electromagnetic shielding effect.It can be divided into: adhesive copper foil, double needle copper foil, copper foil, etc.

Electronic grade copper foil (more than 99.7% putity and 5um-105um thickness) is one of the basic materials of the electronics industry.With 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.Demand of electronic grade copper foil of domestic and foreign markets , especially high performance electronic grade copper foil , is increasing.Relevant professional bodies predicted that by 2015, China electronic grade copper foil domestic demand would reach 300000 tons. China would become the largest place of manufacturer of the world’s printed circuit board and the copper foil base .Electronic grade copper foil especially high-performance foil would have a beautiful market.

Third, the condition of global supply of copper foil

Industrial copper foil can be divided into two categories: common rolled copper foil (RA copper foil) and electrolytic opper foil (ED copper foil). Rolled copper foil has good ductility and other properties, and it is used in early flex pcb manufacturing. Electrolytic copper foil is with the advantages of low manufacturing cost compared with rolled copper foil.Because the rolled copper foil is an important raw materials of soft board, so the characteristics improvement and price changes of the rolled copper foil have a certain impact on soft board industry.

Because the rolled copper foil manufacturers are not many,and the technology is mastered on parts manufacturers, so the customers have differenty in price and supply quantity, so without affecting the product performance, using electrolytic copper foil instead of rolled copper foil is a feasible solution.But if the next few years because the copper foil itself physical properties impact etching.high-frequency products due to telecommunications consideration, the importance of rolled copper foil will again increase.

Rolled copper foil production has two big obstacles:resouce barriers and technical barriers .Resouce barriers need raw material support during the production of rolled copper and resource occupation is very important.Technical barriers, on the other hand, make more new entrants deterred, in addition to the rolling technology, so is surface treatment and oxidation treatment technology .Most major global companies have many technology patents and key technical Know How to increase the barriers to entry.If new entrants use post-processing production, they are under large flaps limit of the cost and it is not easy to join the market successfully, so the world rolled copper foil is still strong monopolistic market

Fourth, the development of copper foil industry

Copper foil ,whose English is electrodeposited copperfoil, is important material of copper clad (CCL) and PCB manufacturing .In today’s rapid development of electronic information industry, electrolytic copper foil is known as”neural network” of electronic products signal and power transmission, communication. Since 2002, China’s printed circuit board production value is the third in the world. AS the PCB substrate material, copper clad has become the world’s third largest producer.It also make the electrolysis copper foil industry in China have the development by leaps and bounds in recent years.In order to understand and know the development of the world and China’s electrolytic copper foil industry in the past, present, and looking forward to the future, the China epoxy resin industry association experts gives a review on the development of it.

At the point of view of industry bureau and market changes of electrolytic copper foil industry, its development can be divided into 3 big development periods: the United States created the original electrolytic copper foil and the copper foil industry started period;The period that Japanese copper enterprises have the world market monopoly ; Period of world multi-polarization fight for market.

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