Production technology and development application

One of the important raw materials in beer is hops, which gives beer special bitterness The ingredients in hops are light sensitive and will decompose under the action of ultraviolet rays in the sun, resulting in unpleasant sunlight odor Colored glass bottles can reduce this reaction to a certain extent Adding tin foil at the bottleneck can reduce the transmission of ultraviolet light, reduce the odor of sunlight, and prevent and reduce corrosion. Of course, beauty and refinement are also very important, or the most important purpose, to make beer feel very classy. Some brands of beer, such as Budweiser's tin foil logo, also has anti-counterfeiting function, and has a red Budweiser logo with temperature sensitive discoloration, With the rapid development of beer packaging industry, most breweries are using aluminum foil for beer bottle mouth label (hereinafter referred to as beer label), and the current product is 80112o, 0.0115mm foil. In the following, the technological process, mechanical properties, pinholes and user's technical requirements of producing aluminum foil for beer standard with cast rolling billets are reviewed, and the development trend of aluminum foil for beer standard is predicted

1. Main technical indicators of aluminum foil for beer standard

1.1 chemical composition of aluminum foil for beer standard

in China, the chemical composition of aluminum foil for beer standard, whether produced from hot rolled billets or cast rolled billets, is 8011 alloy, and the main composition of the alloy is shown in Table 1. However, in production, the actual control composition range of different manufacturers is different. For example, North China Aluminum Company uses alloys with low composition control range to produce aluminum foil for beer standard. The control range of its chemical composition mainly considers that the technical indicators such as tensile strength, elongation and aluminum foil needle porosity of the product should meet the requirements of users

1.2 mechanical properties

at present, the thickness of aluminum foil for beer standard is 0.0115mm. Generally, strip tensile specimens can only be used for mechanical property inspection, that is, tensile specimens with 15mm width, 170mm length and 100mm gauge distance of parallel parts. According to the user's use effect, the tensile strength of 80112o, 0.0115mm aluminum foil for beer standard is generally between 80 ~ 90n/mm2, and the elongation is 2% - 2.5%. In addition, different users have additional requirements, such as burst strength. These technical indicators are generally inspected by the wine label printing factory, and the aluminum foil supplier is not tested separately through process assurance

1.3 requirements for pinhole and surface quality of aluminum foil

thinner beer label aluminum foil can be used for sealing after color coating, so the requirements for its surface quality are high, and the surface of aluminum foil is not allowed to have oil spots, obvious marks and other defects. After the beer label is printed, holes should be evenly punched on the surface of the aluminum foil, which can be said to be the unique process requirements of the beer label during microcomputer operation. Therefore, the requirements for the pinhole of the aluminum foil are very strict, and pinhole defects on the aluminum foil are almost not allowed. If there are many original pinholes in the aluminum foil and the pinholes on the finished beer label itself, the surface of the aluminum foil will become a sieve, and other properties of the aluminum foil will also deteriorate, which will seriously affect the labeling speed of the brewery. However, at present, domestic beer labels supplied with cast rolled billets can achieve small aluminum foil pinholes, which can basically meet the user's requirements in this regard

2. Key points of production process control of beer standard aluminum foil

the following only comments on the key points of process control of beer standard aluminum foil production from cast rolling blank. The process flow is: cast rolling smelting composition adjustment, static furnace refining, degassing, adding grain refiner, filtering, cast rolling, cold rolling, heat treatment in the middle thickness, aluminum foil rolling, double combination rolling, finished products cutting, finished products heat treatment, inspection and packaging

2.1 key points of process control in the casting and rolling process

in the casting and rolling production process, the quality control of aluminum melt is relatively strict. In addition to normal adjustment of composition and thorough slag removal, the melt poured into the holding furnace (static furnace) should be refined. The refining time depends on the weight of furnace charge, which should generally be more than 15min. The refining medium is N2 or n2+ccl4; Before casting and rolling, refining shall be carried out to minimize the hydrogen content of aluminum melt entering the casting and rolling area

in order to control the grain size of cast rolled slabs, grain refiners should be added before the melt enters the filter box. Al2ti2b wire with a diameter of 9.5 ~ 10mm is commonly used, and the adding speed is slightly different according to the slab width and casting and rolling speed. For example, when producing 7.5mm 1200mm cast rolled slabs at a casting and rolling speed of 1.0m/min, the adding speed of al2ti2b wire is generally 200 ~ 250mm/min

2.2 key points of process control of cold rolling and foil rolling

2.2.1 cold rolling and foil rolling

aluminum foil for beer standard has high requirements for shape and surface quality. It is necessary to select a newly ground work roll for aluminum foil rolling of finished product passes. The work roll and guide roll should be in good condition. Set or select appropriate shape curve in each pass to ensure the flatness of aluminum foil

2.2.2 heat treatment of intermediate thickness and finished product thickness

in China, when producing beer standard aluminum foil with cast rolled blank, it is generally annealed in the middle pass of cold rolling. Because the annealing temperature is high (generally above 500 ℃), it is called homogenization annealing. Different manufacturers choose to conduct intermediate annealing in different thicknesses, such as 2.0mm or 0.8mm thick. Homogenization annealing can not only improve the calendering performance of billets, but also improve the elongation of aluminum foil. The factors to be considered when annealing the finished aluminum foil are to eliminate the rolling oil on the surface of the aluminum foil and ensure the mechanical properties of the finished product. Generally, low temperature and long-time insulation are used for oil removal, such as (180 ~ 230) ℃ (20 ~ 30) h, and the oil removal effect can reach the class a water brushing performance specified in gb3198 standard; Considering that the mechanical properties should meet the requirements of technical standards, it is generally annealed at a temperature above 300 ℃ for 20 ~ 30h

with the increasingly fierce market competition in China's beer industry, the competition of beer products has changed from the previous competition of quality and price to a comprehensive competition with brand as the center and quality, label and packaging as the three supporting points. Among them, labels, as an effective method to distinguish products to meet their own needs and even the needs of the world, and an important factor to encourage consumers to buy, have been highly valued by manufacturers. Making wine is making labels

however, for some time, beer labels have not received the attention of the majority of colleagues, but with the rapid development of beer packaging, the labels of beer bottles are also changing. Now most breweries use aluminum foil. In industry terms, it is called beer standard. A good beer label can not only create a good visual impact, but also win market recognition. It is a beautiful and practical brand endorsement for the outer packaging of beer

at present, domestic beer commercial products are 80112o, 0.0115mm foil. Here, the author comments on the technological process, mechanical properties, pinholes and technical requirements of users of aluminum foil for beer standard produced from cast rolling billets, and predicts the development trend of aluminum foil for beer standard

first of all, the main technical indicators of aluminum foil for beer label should be considered from the chemical composition, mechanical properties, pinhole and surface requirements of aluminum foil

in China, the chemical composition of aluminum foil for beer standard, whether produced from hot rolled billets or cast rolled billets, is 8011 alloy. The main composition of the alloy is shown in Table 1. However, in production, the actual control composition range of different manufacturers is different. For example, North China Aluminum Company uses alloys with low composition control range to produce aluminum foil for beer standard. The control range of its chemical composition mainly considers that the technical indicators such as tensile strength, elongation and aluminum foil needle porosity of the product should meet the requirements of users

at present, the thickness of aluminum foil for beer standard is 0.0115mm. Strip tensile samples are generally used for mechanical property inspection, that is, tensile samples with a parallel part of 15mm wide, 170mm long and a gauge distance of 100mm. According to the user's use results, the tensile strength of 80112o, 0.0115mm aluminum foil for beer standard is generally between 80 ~ 90n/mm2, and the elongation is 2 ~ 2.5%

in addition, different users have additional requirements, such as burst strength. These technical indicators are generally inspected by the wine label printing factory, and the aluminum foil supplier is not tested separately through process assurance

thinner beer label aluminum foil can only be used for sealing after color printing, so the requirements for its surface quality are high, and the aluminum foil surface is not allowed to have oil spots, obvious marks and other defects. After the beer label is printed, holes should be evenly punched on the surface of the aluminum foil, which is the unique process requirements of the beer label. Therefore, the requirements for the needle porosity of the aluminum foil are very strict, and needle hole defects on the aluminum foil are almost not allowed. If there are many original pinholes in the aluminum foil and the pinholes on the finished beer label itself, the surface of the aluminum foil will become a sieve, and other properties of the aluminum foil will also deteriorate, which will seriously affect the labeling speed of the brewery. However, at present, domestic beer labels supplied with cast rolled billets can achieve small aluminum foil pinholes, which can basically meet the user's requirements in this regard

secondly, the production process control points of aluminum foil for beer standard are described. The key points and process flow of the process control of producing beer standard aluminum foil from cast rolling stock are as follows: cast rolling smelting composition adjustment, static furnace refining, degassing, adding grain refiner, filtering, cast rolling, cold rolling, heat treatment in the middle thickness, aluminum foil rolling, double combination rolling, finished product cutting, finished product heat treatment, inspection and packaging

the main points of process control in the casting and rolling process. In the casting and rolling production process, the quality control of aluminum melt is relatively strict. In addition to normal adjustment of composition and thorough slag removal, the melt poured into the holding furnace (static furnace) should be refined. The refining time depends on the weight of furnace charge, which should generally be more than 15min. The refining medium is N2 or n2+ccl4; Before casting and rolling, refining shall be carried out to minimize the hydrogen content of aluminum melt entering the casting and rolling area. In order to control the grain size of the cast rolled slab, grain refiners should be added before the melt enters the filter box. Al2ti2b wire with a diameter of 9.5 ~ 10mm is commonly used, and the adding speed is slightly different according to the slab width and the casting and rolling speed. For example, when producing a 7.5mm 1200mm cast rolled slab at a casting and rolling speed of 1.0m/min, the adding speed of al2ti2b wire is generally 200 ~ 250mm/min

the key points of process control in cold rolling and foil rolling processes are described from the following aspects. Aluminum foil for beer standard has high requirements for shape and surface quality. It is necessary to select a newly ground work roll for aluminum foil rolling of finished product passes. The condition of work roll and guide roll should be good. Set or select appropriate shape curve in each pass to ensure the flatness of aluminum foil shape

heat treatment at intermediate thickness and finished product thickness. In China, when aluminum foil for beer standard is produced from cast rolled billets, it is generally annealed in the middle pass of cold rolling. Due to the high annealing temperature (generally above 500 ℃), it is called homogenization annealing. Different manufacturers choose to conduct intermediate annealing in different thicknesses, such as 2.0mm or 0.8mm thick. Homogenization annealing can not only improve the calendering performance of billets, but also improve the elongation of aluminum foil. The factors to be considered when annealing the finished aluminum foil are to eliminate the rolling oil on the surface of the aluminum foil and ensure the mechanical properties of the finished product. Generally, low temperature and long-time insulation are used for oil removal, such as (180 ~ 230) ℃ (20 ~ 30) h, and the oil removal effect can reach the class a water brushing performance specified in gb3198 standard; Considering that the mechanical properties should meet the requirements of technical standards, it is generally annealed at a temperature above 300 ℃ for 20 ~ 30h

finally, the development trend of aluminum foil for beer label is described. Beer label is developing towards the trend of thinning, alloying and high performance. The goal of domestic aluminum foil manufacturers to conduct process research is also roughly in this direction

the thinning trend of aluminum foil for beer standard. At present, the general thickness of aluminum foil for beer standard is 0.0115mm, and some domestic and foreign-funded enterprises have proposed to reduce its thickness