Application and development of tinplate for the ho

Application and development of tinplate for packaging at present, a large number of tinplates produced internationally are used to make packaging containers, which puts forward a special need. The original production of tinplate did not consider the special requirements of packaging container manufacturing, but ordinary tinplate, so there are many inappropriate situations for the production of packaging products. In terms of the development and production of special packaging tinplate, Europe is in the forefront of the world in terms of the number of grids taken from point to left. French iron and Steel Group is the largest iron and steel enterprise in Europe. Its quality and output are no less than those of Japan, and the improvement of production technology and varieties is even less than that of Japan. In recent years, the French steel company first developed and put into the market the tinplate for packaging, which caused a revolution in the packaging industry

manufacturing tinplate for packaging containers is a direction of iron and steel industry development. The special tinplate for packaging developed by French companies in recent years has been put into use in Europe and has a popular trend. The main types of products include tinplates for three piece cans, spray cans and cosmetics cans, closure covers and crown covers, coatings and chemical product containers, two piece cans, special purpose packaging, etc. At present, most of the tinplate used in our country has no distinction between purposes, and there are often unstable quality and some difficult problems when manufacturing packaging containers. If special tinplate can be used, the problem of affecting quality due to materials will be solved. In fact, the problems of product quality and waste products of domestic packaging containers are largely related to materials. The use of special tinplate in European countries illustrates this point. The particularity of packaging tinplate Mr. Giraldo, who is engaged in the research of packaging tinplate in France, came to China not long ago. After understanding the current situation of China's can making enterprises, he believed that ordinary tinplate should never be used for packaging tinplate, otherwise, it would not only be an amazing waste, but also difficult to make profits. According to the different requirements of the packaging industry, the thickness, tin plating amount and mechanical properties of tinplate materials have different needs. At present, the thickness of materials used to make three piece cans in Europe is δ 0.13~o.2 mm, France has achieved the greatest success in the research and application of this material, which not only saves steel and reduces costs, but also does not reduce the requirements of all aspects of the product (such as mechanical strength, etc.). At present, the general development trend of packaging tinplate: (1) reduce the thickness of materials; (2) Improve the mechanical properties of materials. The most important indexes of packaging tinplate are the plastic deformation index and welding performance index of materials. Generally speaking, T610 is used to make beverage cans, t67 is used to make food cans, and the bottom and cover of cans are also made of special steel. Can materials 520 and 580 are easy to weld. The welding performance of Japanese tinplate is not ideal. Experts found that Japanese tinplate is heavily ground after tinning in order to meet the users' psychology of high brightness of the material surface. This is just an unscientific decorative product, but it is extremely unsatisfactory for the welding of the can making industry, with low welding strength and high scrap rate. In fact, for users, this is not worth the loss. In order to meet the different needs of tinplate for packaging, France adopts electrolytic method for tin coating, which not only has a uniform and firm coating, but also realizes positive and negative coatings of different thicknesses. Generally speaking, tinplate is used for can making. The tin plating layer inside the can is thicker than that outside the can, and the tin plating layer inside the can is 2.811 2g/m2, 2 8- 5. 6g/m2。 If the thickness of tin coating exceeds 15.6g/m2 (double-sided), welding cannot be carried out because of the high scrap rate. Therefore, the thinner the tin coating, the better the welding effect. Because tin is too expensive, people prefer to paint the surface at present. At present, 80% of the tinplate produced in France has a tin plating amount of 1g/m2, 2g/m2, 2.8g/m2 and 5.6g/m2, and only 20% of the materials have a tin plating amount of more than 5.6g/m2 for special purposes. According to the tin plating amount, the materials can be divided into three types: (1) 3. The use of Thermo Fisher Haak rheometer in PIM process is relatively thin. (2) 311 # the tin plating amount is general, and it is mostly used to manufacture can products. (3) 312 # thick tin plating, special purpose. Application of tinplate for packaging different types of packaging containers should use materials with different characteristics. For example, for spray cans δ 0.18~ δ The can body is made of T61 sheet with a thickness of 0.12mm; For top cover δ 0.30- δ 0.3 and balance the carbon dioxide emissions of various series of vehicles. 5 mm thick sheet, mechanical properties t52~t55; For tank bottom δ 0.30~ δ 0.31 mm sheet, T65 twice annealed. At present, thick can be used to make food cans δ 0.14~ δ 0.17 mm tinplate has been used in Europe, with a thickness of δ O.11~ δ 0.13 mm sheet. Light packaging can reduce costs. Take food cans for example. In 1974, Europe mostly used tinplate with a thickness of 0.24 mm t59. In 1994, tinplate with a thickness of 0.14 mm dr580~620 was used. This is the development direction. From the table below, we can see that the development direction of tinplate is thinner and higher mechanical properties:

thickness (mm) mechanical properties

0.25

t59

0.23

t59

0.21~0.22

T65

0.20

DR550

according to the statistics of European countries, due to the reduction of material thickness, enterprises can obtain 20% income, compared with the price of cans.The income obtained by reducing 3% - 4% is much higher and easier. At present, French tinplate products occupy 40% of the European market and are growing at a rate of 8%. The main reason is the development of special materials for different purposes. In Europe, some can making enterprises have begun to produce tinplate two-piece cans, but the equipment has not been greatly changed, and they still use the production equipment of aluminum two-piece cans. Replacing aluminum tanks with steel will reduce the cost by 15% - 18%, and increase the mechanical strength of tanks by more than 60%. Now the characteristics of steel not only exceed aluminum, but also exceed the needs of food packaging. At present, Germany is using 0.22mm thick steel instead of aluminum to make two-piece cans. Replacing aluminum with steel is the development direction of two-piece cans. Basic characteristics of horse mouth deficiency for various purposes 1 In recent years, Europe has produced tens of billions of beverage cans every year with its own tinplate. The characteristics of this kind of tinplate are: (1) higher purity, no impurities, and more corrosion-resistant; (2) The drawing width can reach 1200mm; (3) The shape is very correct and the size error is small; (4) Continuous annealing, good toughness. At present, Europe is still continuing to carry out further research and cooperate with other peers in the world. Its technology has been developed unprecedentedly, and its thickness has been greatly reduced on the basis of ensuring the good performance of tinplate. The sheet has superior mechanical properties and plasticity. 2. Tinplate for food cans. Currently, the series tinplates produced in Europe can be used to produce a variety of different types and shapes of food cans. These tinplates mainly include: (1) continuously coated tinplate, which is used for the bottom of DRD coated cans; (2) Tinplate for easy opening cover; (3) Tinplate for stretching can. Among them, the tinplate used to produce ultra-thin cans and crown caps makes it very safe and reliable to open bottles. 3. Tinplate packaging for spray cans and cosmetic cans tinplate is suitable for manufacturing high-pressure spray cans, so that this kind of container meets international standards and is harmless to the environment. 4. Tinplate for containers of paints and chemical products because the special tinplate for packaging has excellent impact resistance and flame retardancy, it is used for these specific fund mobilization and investment decisions by insurance companies. The manufacturing of packaging containers fully conforms to the international provisions of the "Regulations on the transportation and storage of toxic substances". Used to pack paint and paint, manufacturers can save a lot of insurance costs. 5. Tinplate for special purpose packaging. The tinplate used for packaging production has high printability and is most suitable for the printing of containers of various shapes

source: China steel drum packaging