At present, a large amount of tinplate produced internationally is used to make packaging containers, which poses a special need. Originally, the production of tinplate did not consider the special requirements of packaging container manufacturing. It was just ordinary tinplate, so it was often inappropriate for the production of packaging products. Europe is at the forefront of the world in the development and production of tinplate for packaging. The French Iron and Steel Group is the largest steel company in Europe, and its quality and output are not inferior to Japan, and the improvement of production technology and varieties is beyond Japan. In recent years, the French steel company first developed tinplate for packaging and put it on the market, causing a revolution in the packaging industry.

The manufacture of tinplate for packaging containers is a direction for the development of the steel industry. The packaging tinplate developed by a French company in recent years has been put into use in Europe and is trending. The main types of products include tinplate for three-piece cans, tinplate for spray cans and cosmetic cans, tinplate for closure and crown caps, tinplate for paint and chemical product containers, tinplate for two-piece cans, tinplate for packaging for special purposes, etc. To

At present, most of the tinplates used in our country have no distinction of purpose, and there are often unstable quality and some difficult problems when manufacturing packaging containers. If special tinplate can be used, the problem of quality impact due to the material is solved. In fact, product quality problems and waste and defective products of domestic packaging containers are largely related to materials. The use of special tinplate in European countries illustrates this point. To

The particularity of tinplate for packaging

Mr. Giraldo, who is engaged in the research of tinplate for packaging in France, came to China not long ago. After learning about the current situation of my country's can manufacturing enterprises, he believed that ordinary tinplate must not be used for packaging tinplate. Otherwise, the waste is not only amazing, but also It is difficult to make a profit.
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According to the different requirements of the packaging industry, the thickness of tinplate material, the amount of tin plating, and mechanical properties have different needs. At present, the thickness of the materials used to make three-piece cans in Europe is 0.13-0.2 mm. France has achieved the greatest success in the research and application of this material, which not only saves steel, reduces costs, but also reduces all aspects of the product. The requirements (such as mechanical strength, etc.) are not reduced. At present, the general development trend of packaging tinplate: (1) reduce the thickness of the material; (2) improve the mechanical properties of the material. The most important indicators of tinplate for packaging are the plastic deformation indicators and welding performance indicators of the material. Generally speaking, T610 is used to make beverage cans, and T6T67 is used to make food cans. The bottom and lid of the cans are also made of special steel. The can materials are 520 and 580, which are easy to weld. ...

The welding performance of Japanese tinplate is not ideal. Experts found that in order to cater to the user's preference for the high brightness of the surface of the material, the Japanese tinplate performs a lot of grinding after the material is tinned. This is just an unscientific decorative product, which is extremely unsatisfactory for welding in the canning industry, with low welding strength and high rejection rate. In fact, for users, this is not worth the gain. To

In order to meet the different needs of tinplate for packaging, France adopts the electrolytic method for tin plating, which not only has a uniform and strong coating, but also achieves a coating with different thicknesses of front and back. Generally speaking, tinplate is used for making cans, and the tin layer inside the can is thicker than the outside of the can, the inside of the can is 2.8-11.2g/m22, and the outside of the can is 2.8-5.6g/m2. If the thickness of the tin-plated layer exceeds 15.6g/m2 (double-sided), soldering cannot be performed because of the high rejection rate. Therefore, the thinner the tin-plated layer, the better the welding effect. Because tin is too expensive, people are now more willing to paint on the surface. ...

At present, 80% of the tinplate produced in France has a tin plating of 1g/m2, 2g/m2, 2.8g/m2, 5.6g/m2, and only 20% of the material has a tin plating exceeding 5.6g/m2 for special applications. use. According to the amount of tin plating, the materials can be divided into three types: (1) 300# tin plating is thinner. (2) 311# tin plating amount is average, mostly used to make can products. (3) 312# has thick tin plating and has special purpose. To

Packaging tinplate applications. For example, spray cans are made of 0.18-0.12 mm thick T61 tinplate; the top cover is 0.30-0.35 mm thick tinplate, with mechanical properties 752-T55; the can bottom is 0.30-0.31 mm tinplate, T65 Annealed twice. Currently used to make food cans, tinplate with a thickness of 0.14-0.17 mm can be used, and tinplate with a thickness of 0.11-0.13 mm has been used in Europe. The packaging is light, which can reduce costs. Take food cans as an example. In 1974, Europe mostly adopted tinplate with a thickness of 0.24 mm T59. By 1994, tinplate with a thickness of 0.14 mm DR580-620 was adopted. This is the direction of development.