Compatibility design of the hottest aerosol packag

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Compatibility design of aerosol packaging II

the process flow of ordinary two-piece aluminum cans and three piece iron cans is basically the same from the necking process. The only difference is that because the bottom and body of the two-piece aluminum cans are integrated, there is only the capping process in the capping process. Therefore, it can be basically divided into four categories according to the process arrangement where the abnormity is located and the difference in the bulging forming mold technology:

the first category is the mechanical bulging of the can body before the sealing process. The expanding die core is driven by the cam for rapid mechanical forming. It is characterized by fast downstream industry, simple structure and no external mold. After forming, due to the equal division gap of the expanded mold core, equal division expansion marks will be left on the tank wall. The manufacturers adopting this forming technology include Bertil Ohlsson ab of Sweden, oberburg engineering AG of Switzerland, blema of Germany and Xinyi company of Taiwan. This technology has a history of several decades, and the technology has been very mature. It has realized high-speed assembly line production on beverage cans and food cans, and also has a small number of applications on aerosol cans

the second type of forming technology is to expand the hydraulic expansion mold of the can body before the sealing process. Toyo Seikan, a Japanese company, took the lead in launching the tinplate air freshener tank in 1996. Toyo Seikan adopts the principle of striving for better forming, which is Pascal law in fluid mechanics. Therefore, this kind of tank is named "Pascal can". In the same period, the domestic Jiangyin partner company also adopted the same technology to develop domestic equipment. The key of this technology is to replace the mechanical expanding die core with a hydraulic bag, and assist in forming the outer die outside the can body. The utility model is characterized in that the expansion mark caused by the mechanical bulging is eliminated, and the tank wall is kept smooth and smooth; However, the design and material selection of the forming bag is a difficult point. The inner wall of the tank may be damaged due to contact with the material. It is difficult to improve the production speed and control the product quality. In addition, there are certain limitations in the product shape. In Japan, this molding method has been put into commercial production based on historical experience

the third type of forming technology is to directly inject high-pressure water into the tank body after the sealing process. This technology was first introduced on the air freshener tank by us can Europe in 2002. It has opened up the European market and become a new selling point of us can Europe. At the 2003 international metal packaging exhibition in Dusseldorf, Germany, various new shaped and colorful special-shaped aerosol cans (Fig. 5) displayed by us can Europe have attracted extensive attention to this technology. The key point of this technology lies in the design of high voltage source and the sealing treatment in the forming process. The utility model has the advantages of avoiding the complex design of the internal mold and making the molding easier; The disadvantage is that the water contacts with the inner wall of the tank, which brings trouble to the post-treatment of the tank. If it is not handled properly, it will bring hidden dangers to the rust prevention of the tank. But on the whole, this forming method still has great advantages. According to the investigation, no domestic manufacturer has adopted this forming technology at present

the fourth type of forming method is recently introduced by crown cork seal company of the United States. It is formed by directly changing the water pressure type to the air pressure type on the basis of the third type of method, which completely overcomes the shortcomings of water pressure and retains its advantages, and makes the forming style more changeable, the effect better, and the production speed faster. The key technology is the sealing and safety of air pressure. This technology is the most advanced technology known at present and is exclusively owned by crown cork seal. The "human body" simulation model (Figure 6) exhibited by the company at the French aerosol exhibition in september2003 caused a sensation. Crown cork seal has a unique aerosol terminal market, and the prospect of developing special-shaped aerosol tanks is very promising. At the same time, "human body" simulation modeling is also an empirical demonstration to show that it is at the top of new technology

to sum up, the bulging technology of tinplate aerosol tank has gradually developed from mechanical to pneumatic mode, and the product shape has also developed from relatively simple to complex and changeable. With the further maturity of the molding technology, the product cost will be further reduced and the market prospect will be more promising

at present, the laboratory of the technology center of Hangzhou COFCO Meite container Co., Ltd., where the author works, has conducted in-depth analysis and test on the molding technology adopted by us can Europe and crown cork seal, and has successfully trial produced samples of various shapes with similar technologies. The production equipment developed by the company will soon be put into operation. For the domestic peers who are also interested in studying relevant equipment and technology by themselves, the author lists some main molding problems for reference:

main research contents

1) the range of forming pressure of water pressure and air pressure

2) relationship between product shape and bulging pressure

3) whether each index of the product changes due to inflation, and what is the reasonable range

4) are the existing can making materials applicable

5) can the mechanical analysis of material bulging process and results be realized by computer simulation

6) product modeling design

7) high voltage power source design

8) design of bulging die

9) sealing design

10) safety design

11) mechanism action and control design

12) reasonable arrangement of bulging process

13) worker operation design

technical key

1) determine the key technical parameters (such as bulging pressure, material change characteristics, etc.) through the bulging test device

2) the design of high-voltage power source is the key to ensure the safety of equipment and personnel

3) die structure design and mechanism action design are the core design contents

4) mechanical analysis of products and materials is the theoretical guarantee of product safety

as representatives of leading new aerosol technologies in the world, European, American and Japanese enterprises have left a deep impression on their peers or consumers in the pursuit of faster and more energy-saving equipment technology and more innovative product modeling. This is the direction we are pursuing. In addition, the completion of this article benefited from a lot of information and help provided by professor you Yizhong. I would like to express my special thanks here. (author/zhangjunhua)

China's packaging industry

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