Introduction: China's copper processing materials about 250 kinds of alloy, nearly 1000 varieties of products, is the world's most abundant variety of products in one of the countries. Among many kinds of copper processing materials, a large number of hot-spot products produced according to international advanced standards have emerged, which represent the mainstream direction of modern processing technology and application.

In recent years, great changes have taken place in the varieties of copper processed materials in China. In close combination with the market and the needs of scientific and technological development, the development of new products and new materials has achieved remarkable results, the transformation of traditional copper processing products to modern copper processing products has been gradually completed. Its important characteristics are the development of high precision, high performance, environmental protection and energy conservation. Many products have become famous brands at home and abroad, the quality of the products has been steadily improved, and the standard level of the products has been placed in the international advanced ranks. In addition to producing according to the national standards, the major copper producers, it can also directly accept standard orders from major developed countries in the world, which shows that the production of copper processed products in our country has been further internationalized, copper processing enterprises have also developed a number of internal supply technical standards.

The main copper products are as follows:

1. Rolled copper foil

Calendered copper foil is an important material for Flexible electronics. With the promotion and popularization of high-end, miniaturized, portable electronic products such as mobile phones, notebook computers, digital cameras, video cameras and LCD displays, the demand for Flexible electronics has increased greatly. In addition to static flexure, Flexible electronics can also dynamically flex and fold to achieve three dimensional development, which can effectively improve the degree of freedom and flexibility in circuit design and mechanical design, improve the reliability and stability of the whole electronic equipment system. Flexible electronics uses copper foil for both calendering and electrolysis. Because of its high ductility and excellent mechanical properties, the calendered copper foil is used more and more, especially in many special occasions. Currently, about 70 per cent of FPC in industrially developed countries uses calendered copper foil, while the remaining 30 per cent uses electrolytic copper foil. Our country uses the calendering copper foil manufacture FPC the enterprise is starting, the material mainly relies on the import. Some related enterprises in China also plan their projects and are ready to implement the copper foil part first.

2.Lead frame copper strip

Lead frame copper strip is the key material of integrated circuit. At present, more than 80% of all IC packages are packaged in lead frames, which are used to manufacture lead frames for integrated circuits and discrete devices. An average of 100 million pieces requires 100 tons of copper. In 2005, the domestic output of integrated circuits reached 26.5 billion yuan. In the past few years, the output has increased by 20% every year. In 2006, the industrialization level of lead frame copper strip in China has been greatly improved. At present, the domestic self-sufficiency rate of discrete device copper strip is increased, while the high integration of lead frame copper strip is still dependent on imports. The medium strength and medium conductivity of the C194 alloy has been industrialized, and high strength and high conductivity of the C7025 Alloy has begun research and development. The cu-cr-zr Alloy with higher strength is still blank.

3.Copper Strip for transformer

The utility model is mainly used for making the torsion group of the dry-type transformer, and has been popularized and applied in the oil-immersed transformer, and has great market potential. The utility model has the advantages of high efficiency, flame-retardant, explosion-proof, low noise, small volume, light weight, maintenance-free, low operation cost, high use safety and environmental protection adaptability. In the middle and late of last century, dry-type transformer developed rapidly all over the world, and came into our country in the late 1980s. At present, China has become one of the largest dry-variable production and sales countries in the world. Over 50 million KVA was produced in 2005. In general, the low side pressure dry change per 1000KVA capacity, the use of copper strip 400KG. If the high and low pressure side is all copper strip torsion system, then every 1000KVA capacity with copper strip 880KG. At present, the total output of high and low voltage copper strip accounted for about 20% , the rest for low-voltage copper strip, high-voltage copper wire. In 2006, the usage of copper strip for transformer has exceeded 60,000 tons. The requirements of this product are larger coil weight, higher precision, better surface quality, higher conductivity, strip edge without burr.

Source: Tongxinbao

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