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Zhang Wencan: The development history of film laminated steel technology in China

Views: 150 Author: Site Editor Publish Time: Origin: Site

There is a long story about the story of China's study, development and production of film laminated steel.

In the 1970s, the export of canned food was a more important task for China. Due to my duties, I studied hard and found that the bonding force between the coating film in the can and the metal sheet, commonly known as adhesion, will affect the quality of canned products. If the adhesion is good, it can block the diffusion of corrosive liquid at the interface of the metal sheet, especially like a high-acid ketchup jar. If the adhesion of the inner coating is low, the product is difficult to pass. At that time, the adhesion between the domestic coating film and the metal sheet was generally only 30-40 kg/cm2. Therefore, finding ways to improve the adhesion became an important task to ensure product safety.

In the 1970s, we conducted an extensive international search on this issue, and found that Professor T.E.Mullen of Northwestern University in the United States published "Behind Metals and Thin Films" at their 24th National Conference on Metal Corrosion at that time. Adhesion research between the "paper. In this long article, besides the coordinate force and the London force, he pointed out that there are as many as a dozen kinds of forces between the metal surface and the polymer, and the range of these forces is 1 to 5. Between angstroms (A) (no one used nanometer measurement at that time), its size and strength will change with the state of the metal surface and the properties of the polymer film.

Obviously, the depth and breadth involved in this article is a milestone in the research on surface science after World War II.

This paper let us know that under the conditions of printing, coating and film formation, selecting a suitable and qualified solvent and treating the surface, and properly prolonging the wetting time of the coating can improve the adhesion between the known coating film and the metal. According to its guidance, we explore and improve, so that the adhesion of our products will gradually meet the requirements for the safe export of canned food.

In Japan, where the canning industry was relatively developed at that time, the adhesion between the inner coating film and the metal sheet was preferably only about 100 kg/cm2. Mr. Mullen mentioned in his research paper that in the laboratory, the actual adhesion force he can achieve is 1000 kg/cm2. And he also deduced that the ideal theoretical value of binding force can reach 10 times of this value.

The United States is intensively researching surface science. Although the purpose is not stated clearly, it is actually to attach a layer of polymer film material that does not reflect electromagnetic waves on various processed metal surfaces. Because of the rapid development of radar technology, this is the only way to prevent reflection The subject matter of electromagnetic waves can survive and win in the confrontation. According to a report in the United States, when the metal material with the invisible film is broken by various impacts, the polymer material constituting the film is still attached to the metal, as if growing together, and cannot be detected by search.

With such adhesion, it is obviously a leap forward in the application of surface science. This has drawn my utmost attention.

The diffusion of top technology to all related industries is the inevitable result of technological progress. In Asia, Japan's Toyo Seiki developed this technology first, and we don't know how much help they received from the Americans. This technology is also kept strictly confidential to Chinese visitors to Japan for exchanges and visits, without revealing any information. At that time, Britain and other European countries had also succeeded in film laminated steel. At that time, I hoped that the president of British can technology could disclose some information to me, but I was politely rejected.

At the turn of the century, seeing the progress of others, can we in China just stick to the rules and not catch up? Therefore, as a leader in related technologies, I first proposed that my country should explore and establish its own film laminated steel production line. Therefore, I continue to appeal to all parties and introduce the significance of this new technology to our country. I understand that in China, other than doing research and hard work, no one else will help. When it comes to lamination technology, foreigners talk about him.

The domestic situation at that time was that Baosteel was establishing integration, and Wuhan Iron and Steel and Zhongyue Tinplate also lacked relevant strength. They were only familiar with metal sheets and lacked talents who understood polymer films; while printing and coating manufacturers in Shanghai, Guangzhou, and Shandong were only familiar with The talents of polymer materials do not know much about the characteristics and technology of metal surfaces; more importantly, they belong to different management systems, which are difficult to integrate together, especially equipment investment requires huge funds. Under the premise that the prospect is unclear and the technology is difficult to master and implement, no one is optimistic about this technology, and no one dares to take risks and take heavy responsibilities. At that time, I even submitted a written suggestion report to a certain tinplate company, and the superiors of the company could not see the value of this technology, and felt that the risk was too great to allocate funds for research. At that time, I took the establishment of China's film laminated steel technology as a major technical endeavor in the later part of my life, and hoped that China could build this technology in my lifetime.

So I lobbied everywhere: can manufacturers, iron printing manufacturers, large and small steel companies, I appealed everywhere, and vowed: If China does not produce film laminated steel, I will not die. At that time, I was approaching my retirement age, and I hoped that these manufacturers could organize and integrate their forces and be determined to build this technology.

It is very gratifying that Chairman Zhou Yunjie of O.R.G. Group understands the value of film laminated steel and is determined to organize manpower to start independent research and development. Zhao Yuhui and Chen Yufei take the main responsibilities one after another, and gradually raise funds to start experiments. From a complete layman, gradually start to establish Based on various test conditions, products with better and better quality were gradually produced.

ORG decided to develop this technology, and with the joint efforts of all the staff, after many trials and tribulations, it finally produced the first sample with good adhesion. Looking back on when I was in Shanghai, when Mr. Yunjie let me see this first product, I was very relieved, moved and excited. I told Chairman Zhou Yunjie, you are ambitious and scientific, and under the strict seal of others, you have made the first qualified film laminated steel can, and you have won the hearts of the Chinese people.

Stimulated by ORG, Zhongyue Tinplate and Baosteel have successively established production lines in this area, sooner or later. In recent years, O.R.G.'s production of film laminated steel is close to 10,000 tons, and its domestic market share is close to half. This is a great achievement and it has also achieved glory for the country. A. Sayers, a British can maker, once persuaded me to ask Tata for advice. I thought it was unnecessary. If others can do it, we Chinese can do it too. In fact, we have done it too.

The establishment of the film laminated steel factory has raised the technology of the entire food canning industry to a higher level.

I hope that ORG will continue to work hard, assess the situation, expand the scale, and establish a more complete testing system so that the products can perform better under various harsh conditions. I also hope that ORG experts will not be satisfied with the existing achievements, and conduct more in-depth study, research and understanding of the relatively new knowledge of surface science, so that the coating technology can be more refined and widely used, so that It is more beautiful.


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