2016-8-9 10:40:07 Click times：
Abstract: aluminum is a resource rich white light metal, the world's aluminum production, second only to iron and steel. The application of it in the packaging industry in the first place in non-ferrous metals. As the general use of aluminum packaging materials, aluminum plate, aluminum foil and aluminum film and block. Aluminum usually as a potting materials or lid material; aluminum block used in the manufacture of extrusion forming and anti tank Bola deep forming; aluminum foil generally used to do moistureproof packaging or the production of composite materials and soft packaging etc..
Packaging material belong to the antirust aluminum alloy, manganese and magnesium mainly improve the strength of materials and improve the processing performance; copper can improve the strength of materials and reduce and inch corrosion properties and processing properties; adding zinc, especially with copper, magnesium on the same day inch accession, the heat treatment effect good, but in corrosion resistance and workability will decline; silicon joined mainly reduction of aluminium melting point, improve melt strength and fluidity, decrease the coefficient of thermal expansion. Aluminum foil is made by the thickness of.7mm (0.4-4) (more with 0.5mm) industrial pure aluminum plate through a number of cold rolled thin and can be made of flexible metal sheet.
Characteristics of aluminum materials
Compared to other packaging materials, aluminum material has the following advantages:
(1) the density of aluminum is very small, 2.7g / cm, only 35% of the steel. This makes it easy to implement lightweight containers. The surface of aluminum can naturally produce a layer of dense three oxide two aluminum thin film, this layer of colorless film can prevent further oxidation.
(2) aluminum, non-toxic, tasteless, in line with the health standards of packaged food.
(3) the surface gloss of aluminum is high, easy to color, printing effect is good.
(4) which is made of aluminium material easy open tin plate is better than easy.
(5) the effect of aluminum on the performance of light, heat and conduction performance, can improve the heating sterilization and low temperature treatment.
(6) the mechanical properties of aluminum can be kept constant at low temperature, especially for the packaging of frozen foods.
(7) composite films made of aluminum foil are completely airtight and non transparent, and can effectively protect the inner container. Aluminum foil can also improve the strength of aluminum-plastic composite membrane.
(8) the waste can be recycled, which can save energy and prevent the pollution caused by waste, and meet the requirements of environmental protection.
But the aluminum materials have some shortcomings, mainly:
(1) a much larger aluminum production relative tinplate and TFS energy consumption, so the price is too expensive.
(2) aluminum is a non magnetic material, so the original equipment used to draw raw materials must be modified.
(3) aluminum corrosion resistance is poor, should not be used for containing acid and alkaline and salt content of the food.
(4) aluminum material is soft, compared with tin lower intensity, in manufacturing and transportation easy due to collision and deformation, surface scratches and so on.
(5) difficult to weld aluminum, so can only be made by stamping or bonding method.
At present, through the composite with other materials to make up the shortcomings of aluminum. For example, aluminum foil and paper or plastic composite, can be to increase the stiffness and tensile strength; for the shortcomings of overcoming thin-wall aluminum cans stiffness low, before the closure of a container filled with a small amount of liquid nitrogen and liquid nitrogen vaporization pressure can increase the container the stiffness and compressive properties; by the nitro cellulose and modification of polyolefin coated aluminum foil, not only to improve the chemical properties of aluminum foil, maintain the good appearance of a print, and provides a heat sealing.
Two, aluminum material in packaging applications
1, aluminum anti-theft cap
In our country at present most of the packaging of liquor, wine, liquor and beverages, such as still in glass based, cover about 50% of the wine bottle cap manufacturing aluminum anti-theft, anti-theft bottle cap in China will grow at a rate of 10% per year, is expected to 2010, anti-theft cover amount will reach 150 million, the need of aluminum plate and strip 6 million tons about. China's aluminum bottle production plant nearly 200, annual design capacity of about 90 million, including the introduction of 30 production lines, capacity for more than 50 billion only, production of nearly 100 kinds of bottle cap. Aluminium closures multi in a very high degree of automation of the production line processing, so the material strength, elongation and size deviation require very strict, otherwise it will rupture or crease in the deep drawing process. In order to ensure the bottle cap forming convenient printing, requirements of the material bottle cap is flat plate surface, no roller marks, scratches and stains, generally uses the alloy material have 8001 HI4, 3003 a H16 and so on. Materials specifications for the general thickness of 0.20~43.23mm, allow tolerance of + 0.1%, width of 449-796mm. The aluminum cap materials can be used for the production of hot rolled slab or billet for continuous casting and rolling, cold rolling and the. The production practice shows that the hot rolling stock is superior to cast rolling stock in the use of the anti theft cover.
2, blister packing
At present, blister packing form are more and more common in the health food and pharmaceutical tablets, capsules, aluminum-plastic blister and said blister, referred to as PTP (PressThroughPackaging). Blister packaging aluminum foil is dense in medical plastic polyvinyl chloride (PVC) film on the sealing material, so also known as cover material. Modern packaging requirement for almost all opaque or high barrier composite products using aluminum foil as a barrier layer, which is because of the highly dense crystal structure of metal foil, can block out any gas, therefore its application is very extensive. It is expected to be used for the packaging of pharmaceutical blister materials, which will occupy about 60%~70% tablet and capsule packaging. It is one of the best medicine packaging materials at present.
But at present, the quality of medicinal aluminum foil in our country is far away from the import of aluminum foil. From the current domestic production of several PTP pharmaceutical packaging enterprises reflect the actual situation, the main problems in the following two aspects.
(1) Shuyuan medicinal aluminum foil pinhole is not up to the requirements. Aluminum foil pinhole is penetrating performance defects, affecting the barrier properties of aluminum foil, especially for drug packaging, it is easy to make oxygen, water vapor, light penetration and make the drug efficacy. Medicinal aluminum foil in the national standard requirements of the pinhole diameter of not more than 0.3mm, 0.1 ~ 0.3mm in diameter can not be more than 1 / m2, the current domestic aluminum foil rarely reach this standard.
(2) the thickness of the aluminum foil is uneven, and the tensile strength is low. Due to the foil thickness uneven, easy to cause in the process of PTP aluminum foil coating machine coating adhesive is difficult to achieve the standard coating weight range, thereby affecting the aluminum foil and poly (vinyl chloride PVC yingpian hot pot strength. Due to uneven thickness, tensile strength is low, resulting in the actual processing of the tension in the production of broken foil, is not conducive to the normal production, these issues need to be paid attention to the production of raw materials.
3, aluminum beverage cans
At present. The development of aluminum beverage cans has three characteristics, namely, Yilagai special tank, self heating and self cooling beverage cans.
For a long time, although aluminum beverage cans, metal packaging has been the challenge of tin plate and PET material, but because of its light weight, and has a recovery advantage, is still the main beverage packaging forms one, not only by development and stability, but also in the continuous development and innovation.
Recently, coins packaging company developed a EPOL (easy to open cover). The tank cover adopts the steel ring of the polymer coating and the corrosion resisting aluminum foil sheet heat sealing, can be used for the existing filling equipment, the aluminum foil cover can be opened safely, and is more suitable for the use of the old people and the children. Due to the competition of PET bottles, in recent years the Japanese market beverage demand for aluminum cans decreased gradually, but the development of new aluminum bottles, aluminum cans demand began to rise again. At present, Wu stamping industry, and cans and Mitsubishi materials and other enterprises have entered the field of aluminum bottle production, Chai Qi manufacturing factory aluminum bottles cover also put on the market.
Daiwa Seikan to advantage complementary, focusing in PET bottles and aluminum cans two beverage packing container of the advantages and disadvantages, enhances strong points and avoid weaknesses, in the world the first successful development of the can give metal cans to re sealing of beverage packaging container (bottle cans).
New bottles is beyond the existing tank and three tank structure framework and the development of a new packaging containers, it is not only used the current three piece cans of composite technology, curling stamping technology and but also used two piece can deep stamping forming technology into a pot body and then with the existing canned contents and distribution to the threaded cover processing technology, in order to achieve the use of aluminum metal, processing formed with bottle type and diameter of 28mm drink new metal bottle packaging containers. The new container has the advantages of both metal and PET bottles, and overcomes the inherent shortcomings of the two. To consider the environment, selects the new bottle tank is a single metal aluminum alloy material, on the surface of the material, namely tank body inner and outer surface of the compound by a PET film; bottom cover the inner surface has also added PET composite film, appearance surface coating pet; low density pet on the cap coating, surface impose printing and coating. This new inner tank surface can avoid contact with the contents of all kinds of paint, without the use of traditional use of metal cans. After the success of the new bottle pot trial has in Australia in 2000 to the canning industry exhibition exhibited and in the name of Japanese companies get exhibition awarded the grand prize. This technology is also very eye-catching in the world, in the future, the demand for a PET tank is likely to further expand.
According to the survey by the Japan aluminum can recycling association, due to the production of aluminum bottles into the four companies, 2002 sales of aluminum bottles only reached 15 billion irrigation is 2.5 times the previous year, 2003 on the basis of the increased about 20%.
The beverage packaging market is one of the largest markets in the metal packaging market. In order to improve the brand effect, in addition to using aluminum silver white characteristics, the shape of the aluminum cans is becoming more and more important, so the manufacturer of metal forming equipment is also in discussions of aluminum cans of molding and embossing techniques. Because aluminum is much easier to form and to achieve the required shape, the researchers are exploring the expansion forming, spinning forming and rheological forming technology of aluminum pot, in the near future will be used in beer cans.
Beer and soft drinks and other beverages using aluminum cans packaging has increased the use of aluminum products, and other industries are also considering the use of aluminum cans products. According to the American industrial information resources companies to provide information, more than a year ago, Japan's largest aluminum cans manufacturers and aluminum cans company began for beer and tea company production of aluminum cans, the company last year has produced 4.8 billion aluminum cans, plus two other Japanese aluminum cans manufacturers, expected in the next 2-3 years Japan aluminum cans production will turn a lot of. Aluminum cans are favored by the beverage industry due to light weight and easy recovery. Recently, it has been popularized to other industries and has the trend of replacing glass bottles and metal bottles.
Three, conclusion
Experts believe that the aluminum material new market share will be with the so-called effective packaging (activepackaging) advance new progress. Due to the application of new technology of aluminum product development, aluminum demand will be further expanded in the future.
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