Metal Packaging New Material: Coated Steel

A coated steel sheet, ie, an organic coated steel sheet, refers to a coated metal material obtained by coating an organic coating on a surface of a steel sheet. Such coated steel plates do not need to be coated after the Packaging industry produces various types of packaging products. Therefore, coated steel plates are often classified as precoated steel plates.

In recent years, coated steel plates have developed rapidly in the world, especially in the automobile manufacturing, construction and decoration industries. From the current development trend at home and abroad, coated steel sheet has begun to be applied as a packaging material and presents a rapid development trend. According to estimates of relevant experts, coated steel sheets will be widely used in the Metal Packaging industry to replace the metal packaging products currently lagging behind in the coating process.

The coated steel sheet combines the advantages of both organic polymer and steel sheet. It not only has good colorability, formability, corrosion resistance, and decorative properties of organic polymers, but also has high strength and easy processing of steel sheets, and can be easily Punching, bending, deep drawing, welding and other processing, which makes the packaging products made of organic coated steel plate has excellent practicality, decorative, processability and durability.

Coated steel plates are generally produced centrally by metallurgical companies, eliminating the need for coating processes in product manufacturing and greatly reducing packaging manufacturing costs. It is estimated that the cost of packaging products using thin steel plates as raw materials can be reduced by 5% to 10%, and energy saving can be reduced by about 1/6 to 1/5. In particular, the pre-processing of packaging products and the large investment in painting equipment have been saved, and the company’s environment and workers’ working conditions have been improved, and are naturally welcomed by packaging companies.

Type of coated steel sheet

At present, there are a large variety of coated steel plates, approximately more than 600, but there is still no strict classification method because it is difficult to find a standard that distinguishes them among a large number of varieties. At the same time, all manufacturers have their own unique equipment, processes, product variety.

According to common practice, coated steel sheets used as packaging materials can be classified into the following categories.

According to the use of substrate classification

Commonly used substrates for coated steel sheets are: cold rolled steel sheets, hot-dip galvanized steel sheets, hot dip galvannealed steel sheets, hot-dip galvanized-aluminum alloy steel sheets, electrogalvanized alloy steel sheets, electro-galvanized steel sheets, tin-plated steel sheets, and chrome plating ( Wuxi) steel plate, aluminum plate and so on.

Classified by processing technology

According to different coating methods, there are coating steel plates obtained by roll coating, spray coating, spray coating, powder coating, film coating, printing, etc.; depending on the number of coatings, there is a coating, a baking, two coating two baking The coated steel plates coated by different processes, such as three-coat three-baking and four-coat four-baking, can be subdivided into wood plate grain, marble grain or sheep grain grain, cement mortar grain, etc. .

According to the type of paint used

It is generally classified according to the coating used for producing the color coating, including a polyvinyl chloride coated steel plate, a polyester coated steel plate, an acrylic coated steel plate, a fluorocarbon coated steel plate, a silicon polyester coating, and the like.

Development of coated steel plate

As early as 1927, the United States began to produce coated steel plates. In 1936, the United States first built a continuous coated steel plate production line with the prototype of a modern coating production line.

Currently, there are approximately 474 coated steel plate production lines in nearly 200 companies in 40 countries and regions around the world. There are about 200 production lines in the United States, more than 50 in Japan, 120 in European countries, and 74 in Asia.

At present, the annual production capacity of coated steel plates in the world is 14 million tons, of which US 4.5 million tons, Europe 4 million tons, Japan 2.7 million tons, and other countries in Asia about 1.2 million tons. The combined annual production capacity of the United States, Japan, and Europe accounts for about 84% of the total production capacity of the world.

Development of coated steel plate in China

China's coated steel plate production started late. In the 1980s, China began to introduce coated steel production technology and equipment. In 1983, Anshan Iron and Steel Cold Strip Plant introduced two single-roller coating lines from Japan to produce (0.5-1.5)mm×1000mm×2000mm coated steel plates with an annual production capacity of 1,500 tons.

In 1985, the Anshan Cold Rolling Plant imported second-hand equipment from the US Epicon plant.

In 1989, Baosteel introduced a set of high-speed automated coating production units from the American Wayne Company to produce (0.3 to 2) mm×1500 mm coated steel plates with an annual production capacity of 227,000 tons. The hot-rolled steel strips and cold-rolled steel strips were pickled. , electro-galvanized and hot-dip galvanized steel strip for the substrate. In the same year, Beijing Steel Window Factory introduced a (0.25-1.2)mm×1100mm coated steel plate production line from Japan with an annual production capacity of 35,000 tons.

The total production capacity of the 10 coated steel plate production lines at the time was 826,000 tons.

After 1998, all industries and industries in China have developed rapidly. The market demand for coated steel plates has greatly stimulated the consumption and development of coated steel plates, and production and consumption have increased year after year. According to the investigation and analysis conducted by the relevant state agencies, during 1998-2001, the average growth rate of coated steel plate production in China was 64%, and the annual growth rate of consumption was 68%. The output of self-produced coated steel plate in China was far from satisfying the market. Demand, therefore, since 1995, the import volume of coated steel plates has also increased year by year. Almost every year, the import volume is about 1 to 2 times higher than the output. It can be seen that in recent years, the coated steel plate in China has been in short supply, and the gap is very large.

In the past two years, there has been an upsurge in steel investment in China, and the construction of coated steel plate production lines is also growing rapidly. According to incomplete statistics, as of May 2004, China has built 24 coated steel plate production lines, which has an annual production capacity of 1.616 million tons. In addition, there are more than 10 production lines under construction and under construction. The construction of these production lines has greatly increased the production capacity of coated steel plates in China, and has also enabled China to enter the ranks of major producers of coated steel plates.

With the rapid development of all walks of life in China in the past 10 years, the demand for coated steel sheets has rapidly increased. This provides basic conditions for the widespread use of coated steel sheets as packaging raw materials in China. The coated steel sheets will quickly become ideal for the metal packaging industry. Alternative materials.