Current situation of the hottest cans industry and

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The current situation of the can industry and the supply of can materials (II)

the state of the can body material is H19, that is, the cold rolling rate should reach 88%, and the comprehensive yield from the milling of the hot rolling section (two sides) to the cold rolling to the finished product. At present, the international advanced index is 70%. If the melting and casting burning loss and loss of 3% are calculated and milled on all sides, the comprehensive yield is only about 65%, which is the situation of large-scale normal and stable production, The new plant will take a long time or even a year or two to reach this level. Most of the covering materials are 5182-h19 strips, and 5052-h19 or h48 are also used. The width of the material depends on the number of blanking positions. For example, East China Sidi cover Co., Ltd. has a 3-station production line, which uses coiled materials, with a production capacity of 1.1 billion/a and a strip width of 62mm; A cover making company in Malaysia uses 68mm wide strips; Bohr (Shenzhen) container Co., Ltd. has a 22 station cover making line with a production capacity of 3 billion/a, and Sanshui Jianlibao Meite container Co., Ltd. has two 22 station cover making lines with a production capacity of 2 billion/a each, using 1477mm wide strip, which is the widest cover making line in China. Strip width for other capping enterprises (mm): 478, 540, 740  862, 950, 95 capacity 5, 862, etc. The capping production process is to form a combined cap on two production lines. The cover material has not only many width specifications, but also more thickness specifications. The concept of 0.2 environmental protection is easy to get everyone's favor. 2mm~0.315mm, such as 0.23mm, 0.25mm, 0 Domestic diaphragm enterprises still lack stable diaphragm special materials that can really meet the demand in terms of materials. The supply sources of 27mm, 0.28mm and 0.30mm are all available. There are many capping enterprises in China, with an estimated 50 or so, both coil and chip, with a total production capacity of more than 40 billion/a

most of the pull ring materials are 5052-h19, but Nuowei aluminum strip company only supplies 5182-h19 and 48 coils. Material width: 45mm, 46mm, 68mm

at present, all can materials are hot-rolled cold-rolled, and there is no commercial cold-rolled can material for continuous casting and rolling or continuous casting and rolling strip. The report that "developed countries have begun to use continuous casting and rolling and continuous casting and rolling technology to produce aluminum alloy materials for cans" needs to be verified. After years of research, the aluminum processing industry and the can making industry believe that continuous casting and rolling strips cannot be used for cold rolling cans, at least until 2015. Unless a major breakthrough is made in roll casting and rolling technology, strips with good metallurgical structure, low anisotropy and high deep drawing performance can be produced. However, it is now studying the use of cold-rolled can materials for continuous casting and rolling strip billets, and it is said that encouraging achievements have been made, but it will take some time for commercial production, which can not be achieved in a year or two

among the 22 existing can making lines in China, there are 5 with 10 stations (Meite Qingdao container Co., Ltd., East China United can making Co., Ltd., crown Foshan can making Co., Ltd., Guangzhou Rongxin container Co., Ltd., Pacific Zhangzhou can making Co., Ltd.), and the width of the can body is 1240mm; The remaining 17 are 12 station, with strip width of 1470mm~1520mm, but as long as the die set is changed, it can become 14 station, of which 4 (crown Huizhou canning Co., Ltd. 2, crown Shanghai Packaging Co., Ltd. 1, crown Beijing canning Co., Ltd. 1) cannot be changed to 14 station (but can be replaced with a new one), because their cup making machine is old-fashioned, stundan products, and the other 13 can be changed, Because the cup making machine is the product of Minster company and the leading cup making machine in the global can industry. The strip used in the 14 station production line is 1750mm wide

China has built two (1+4) hot continuous rolling production lines, and is building one (1+5), one (1+4) and two (1+3) hot continuous rolling production lines, of which the leading products of four are can body materials. One of the four hot continuous rolling production lines is 2000mm. It is impossible to roll 1750mm wide can body material for cold rolled products with this hot rolling line, but this material has undoubtedly become or will soon become the mainstream of can body material in the world. A new hot continuous rolling production line with the production of cold rolled can body material as the leading product can not meet the needs of most can manufacturing enterprises for wide specification aluminum strip. It can not be said that it is a pity. Fortunately, The width of the roller surface of the other three lines meets the requirements

it is not a problem to use a 2000mm hot continuous rolling line to roll a 1520mm wide hot rolled strip at 12 stations. However, the width of uncut hot rolled strip should be 1720mm or even 1750mm. Of course, it can also be narrower. However, it must be pointed out that when 2000mm hot rolling mill is used to roll materials of this width, the production line operates close to the critical state or limit conditions, requiring the operator to be skilled and have higher quality, otherwise, the benefit will be affected

it can be seen that the width of the roll surface of the hot rolling line for rolling can materials should not be less than 2200mm, unless only can materials with less than 12 production stations are produced

in the production of can body, the 1240mm wide 10 station strip is a low-grade product, while the 1520mm wide 12 station strip is a medium-grade product, and the 1750mm wide 14 station strip is an outstanding high-grade product

from the experience of producing can materials in the world, it takes about two years for a new factory to start trial production of can body materials and mass produce products with international market competitiveness, unless a large aluminum company transfers a full set of experienced personnel from other old enterprises and has fixed users. Therefore, the can body materials that China can produce in the second half of 2007 or at the beginning of 2008 can be accepted by 10 position can making enterprises. They believe that the quality of domestic materials is equivalent to that of imports, and the price is slightly lower, which is a great achievement, and then occupy a part of the market of 12 position strip materials, and strive to use domestic materials for more than 80% of domestic can making enterprises around 2012. I hope this view of the author is unrealistic and too conservative

don't underestimate the difficulty of launching products that occupy the domestic can material market. Therefore, all the existing domestic can making enterprises are wholly foreign-owned or Sino foreign joint ventures. They have solid can material suppliers. At the same time, these suppliers are transnational aluminum companies whose big experimental results are credible. It is by no means easy to squeeze them out of the domestic market. They are "competing with tigers for food", The production cost of our can materials will not be much lower or almost the same as theirs. I have discussed this issue with the staff of some large aluminum companies, who believe that China's can material is not enough to pose a threat before 2010

the can stock rolling enterprise should not only have a high-quality production management personnel and sales personnel, but also have "double stock" after-sales technical support personnel who are proficient in material production and skilled in can making technology. Once the can making enterprise has problems in the production process, it can rush to the scene to deal with them in time, store the found problems and solutions into the computer, and the factory will analyze and summarize the problems every year and hold a discussion meeting, It is very important to put forward solutions and preventive measures. Large aluminum companies do this, which is worth learning from

there is also a situation that the existing can making enterprises in China belong to several major groups, such as Boer, crown, Pacific, Meite, etc., which all purchase all kinds of raw materials, making it more difficult to compete with them for market share

development trend of can material

as we all know, the thickness of can material has historically developed in the direction of thinning, which has decreased from 0.42mm in the 1970s to 0.254mm at present (most of them are still about 0.28mm), and the thickness has been thinned by 39.5% over the past 30 years. Of course, the thinning of materials is to reduce costs. For every 0.01mm of can material thinned, the material cost can be saved by US $0.22 per 1000 cans; Another trend is to research and develop a single can material alloy to replace the current three alloys, which can not only reduce production costs but also improve waste utilization

however, the latest research in the United States has proved that the ear making rate can be significantly reduced by using 0.3mm thick can material and changing the cup punching bad material from disc to polygon, which saves more raw materials than thinning. This new invention deserves attention, but it is not the task of this paper to explain this problem, nor can it be explained clearly in a few words

at present, when calculating the tank body material, 7 can be produced according to 1t material (0.28mm thick) × 104 calculations, plus 1.92% process waste cans (referring to China's waste rate). For example, in 2005, China produced 10.3 billion cans, consumed about 150kt of 0.28mm thick strip, and about 70KT of cover and tab materials, so the total consumption of can materials was about 220kt, and the ratio of can body materials to cover materials was 68:32; In 2010, the demand for tank materials was about 390kt; It can reach 625kt in 2015. This is only domestic demand. After 2012, there is a great possibility that China's can materials will be exported to Southeast Asia, the Indian subcontinent and the middle and Near East

in 2005, China net imported about 300 kt of plate and strip, of which about 65% were cans

source: China Nonferrous Metals News

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