With the rapid development of China's wire and cable market, the overall level of the industry has been greatly improved. However, the Chinese wire and cable market is currently facing a difficult transformation, and it is urgent to narrow the technological gap with international manufacturers. Especially in the high-speed development of the aluminum alloy cable market in recent years, the product quality is uneven, which has become a huge safety hazard. The development of the industry is gradually becoming more mature. The emphasis on cable quality and safety, the pursuit of technological innovation and the responsibility of corporate citizenship are becoming the mainstream of development, so as to get rid of the current pure price competition pattern. At the same time, as people pay more and more attention to environmental issues and sustainable development, they are willing to invest in R&D and innovation, and use more environmentally friendly and recyclable materials to reduce environmental damage, which have become the development direction of wire and cable companies.

The 1990s was an important stage in the development of my country's winding wire industry. From the 1960s to the mid-1980s, due to the establishment of a good foundation for self-reliance, my country already has all the basic varieties of winding wires in the world, as well as the basic settings and professional talents for the development of new varieties. Development has created the necessary conditions. The general characteristics of the winding wire industry in the 1990s are as follows: 1. In advanced industrial countries, a complete set of technologies for the production of winding wires has been introduced, from raw and auxiliary materials (such as the production of conductor cores and insulating materials), production equipment (including wire drawing machines, enameling machines and winding machines, etc.) to finished product testing equipment Entered the advanced ranks of the world. 2. In the process of the national economy's transformation from planned to market-oriented, my country's winding wire production plants have also undergone major reorganization and rearrangement, and enterprises with technological advancement and advanced management have emerged. 3. The output of winding wires has grown from more than 100,000 tons in the mid-1980s to nearly 300,000 tons in the late 1990s, which basically met domestic needs, and part of it was exported. my country has become the world's largest producer of winding wires. It can be said that the late 1980s to the 1990s was a period of great development in my country's winding wire industry. However, in terms of product structure and product quality, there is still a big gap between my country and advanced industrial countries. For example, in the winding wire, the ratio of enameled wire to winding wire is estimated to be around 85:15 in my country in recent years, while the ratio in the United States was around 95:5 in 1987, and the ratio in Japan was around 90:10 in 1997; In enameled wire, the thermal grade of the main product and its proportion, in recent years, it is estimated that the 130 grade polyester enameled wire accounts for about 80%. In the United States in 1987, the 200-class enameled wire accounted for 41.2%, and the F-class and above heat-resistant enameled wire was calculated to be 70.4%. Japan's statistics in 1997 accounted for 33% of heat-resistant enameled wires of class 18 and above; some of the enameled wires used in the production lines of some electrical products imported from China still need to be imported, and domestic enameled wires are often unusable due to various reasons.

NOMEX insulating paper has extremely high electrical, chemical and mechanical integrity, elasticity, flexibility, tear resistance, moisture resistance and abrasion resistance, and is very resistant to acid and alkali corrosion. It can be combined with all kinds of varnishes, adhesives Mixtures, transformer fluids, lubricants, and refrigerants are compatible. Since NOMEX products are not easily digested, they will not be destroyed by insects, fungi and molds. The electrical and mechanical properties of NOMEX products are basically unaffected when the temperature is not higher than 200℃. Even if the product is continuously exposed to a high temperature of 220 ℃, it can be maintained for at least 10 years. Aromatic polyamide (NOMEX) paper-covered wire wrapped by extruded bare wire (copper or aluminum) has better mechanical and electrical properties. It can replace the difficult composite enameled flat wire, suitable for transformers, Lifting electromagnet, electric welding machine and other products winding. NOMEX paper-covered magnet wire can be applied to the coil winding of oil-immersed transformers such as mobile transformers, traction transformers, pole-mounted distribution transformers, power substations, rectifiers, and furnace transformers. Oil-immersed transformers using NOMEX paper-covered magnet wires bring many economic, environmental and safety benefits to users, reduce weight, reduce volume, reduce transformer oil, improve safety, reduce transformer flammability, increase capacity and reduce Advantages such as energy loss. Transformers insulated with NOMEX products have extra capacity, which can cope with emergency overload conditions and unexpected expansion. If the transformer is continuously operated at or close to the rated load, you can use the insulated wires of NOMEX products and use NOMEX products. The temperature rise of insulated dry-type transformers can be designed to be as high as 150°C, thereby reducing wires and iron chips and reducing production costs.

Due to the limitation of economic strength and technical level, the construction of urban rail transit in my country started late. The quality characteristics of various paper-covered wires are different, but they all have four major properties: mechanical properties, chemical properties, electrical properties, and thermal properties. Enameled wire is the main and key raw material for electromagnetic windings of motors, electrical appliances and household appliances, telecommunications, and electronic instruments. Before 2000, only Beijing, Shanghai and Guangzhou had rail transit lines in the country. It is composed of a conductor and an insulating layer. After the bare wire is softened by annealing, it is painted and baked many times. With industrial electrical appliances and entering the 21st century, with the rapid development of China's economy and the acceleration of urbanization, urban rail transit has also entered a period of great development. At present, more than 40 cities in my country have formulated large-scale rail transit development plans. At present, 10 cities in my country have opened 31 urban rail transit lines with an operating mileage of 835km. It is estimated that by 2016, my country will build 89 urban rail transits totaling 2500km. my country's urban rail transit industry has entered a new stage of leapfrog development, and my country has become the world's largest urban rail transit market. According to forecasts, during the "Twelfth Five-Year Plan" period, rail transit cables for trains and trailers will be approximately 25,000 to 30,000 kilometers. The rapid development of household appliances, telecommunications, and electronic products will bring a broader application field and market to enameled wires. The annual volume of signal cables for urban rail transit is about 15,000 to 20,000 kilometers. my country has become the world's paper-covered wire manufacturing center and processing base, and is the world's largest paper-covered wire production and sales country, accounting for about 30% of the world's total output. China's enameled wire production volume in the past two decades, the rail transit special cable market is mainly occupied by three cable companies, namely Haoxun, Nexans and Chaohu Haixing Cable Factory. Among them, Haoxun and Nexans are both global high-end special wire and cable manufacturers, and have established production bases in China. In the rapidly developing high-speed rail field, the two foreign-funded enterprises together occupy more than 90% of the market share. The field also occupies about 60% of the market. Chaohu Haixing Cable is the largest rail transit cable manufacturer in China, increasing at an annual rate of over 10%. It is expected to increase to about 50% by 2015, reaching a scale of 1.6 million t/a, becoming a veritable enameled wire production country and power. It is a designated professional wire manufacturer by the Ministry of Railways, occupying about 35% of the market share in urban rail transit and about 10% in the field of high-speed rail. The rail transit field is also the same as the civil aviation field. After long-term development, China has become a large producer and user country of electronic components such as relays, micro-motors, and electronic transformers. However, due to the process, technology, and equipment However, the supply of high-performance special cables has to rely on imports. Fortunately, companies such as Chaohu Haixing have emerged in this field that can partially replace imports. I believe that with the amount of cables used in rail transit With the continuous expansion and deepening of the research and development process of the company, more and more similar companies will come to the fore. The domestic production capacity of fine enameled wire is far from being able to meet the demand. Occupy a place in this high-end market.

The paper-covered wire must satisfy that in the actual production process, the operator cannot completely rely on the laser diameter gauge to ensure the dimensional quality of the product. Since the laser diameter gauge is a high-precision measuring instrument, there are many requirements on the use and manufacturing process during use: the paper covered wire is composed of two parts: a conductor and an insulating layer. After the bare wire is softened by annealing, the former includes its shape, Specifications, can work under high temperature for a short time and for a long time, and then painted and baked many times. Various enameled wires are affected by the quality of raw materials, and withstand strong vibration and centrifugal force at high speed in some occasions, resistance to corona and breakdown under high voltage, and resistance to chemical corrosion under special atmosphere; the latter includes winding It is subject to the requirements of stretching, bending and abrasion during the production and embedding, as well as the swelling, process parameters, production equipment, environment and other factors during the dipping and drying process, which can be measured by laser scanning. The laser does not need to touch the line, and accurate data can be obtained through induction. Convenient and fast, real-time monitoring of production and full-process monitoring. The quality characteristics are different, but they all have four major properties: mechanical properties, chemical properties, electrical properties, and thermal properties. Erosion and so on. Paper covered wire is usually divided into paper covered wire, Nanjing Judian new material paper covered wire, enameled wire and enameled wire are the main and key raw materials for electromagnetic winding of motors, electrical appliances and household appliances, telecommunications, and electronic instruments. The rapid development of, household appliances, telecommunications, electronic products, etc., inorganic insulated wires. The earliest paper-covered wire was oily enameled wire, which brought a broader application field and market to the paper-covered wire. my country has become the world's enameled wire manufacturing center and processing base, and is the world's largest enameled wire production and sales country. Made from tung oil, etc. The paint film has poor abrasion resistance and cannot be directly used to make motor coils and windings. It needs to be covered with cotton yarn when used. The enameled wire in production runs at high speed, and it is impossible to measure accurate data with any contact measuring tool, and it is easy to cause wire breakage when the paper-covered wire is small in size. On-line laser measuring instrument, and later the polyvinyl formal enameled wire came out, its mechanical performance was greatly improved, it can be directly used in motor windings, and is called high-strength paper-covered wire. Paper-covered wire still occupies a considerable position in the wrapped wire, which is mainly used in oil-immersed transformers. The oil-paper insulation formed at this time has excellent dielectric properties and is low in price. It is easy to adhere to dust and impurities at the laser probe and cause measurement deviation. Therefore, it is very important to maintain and calibrate the laser diameter gauge regularly. long life.