The application of aluminum material in the packaging industry
Rich white light metal aluminum is a kind of resources, the world's aluminium production is second only to iron and steel.Its application in the packaging industry in non-ferrous metal first.Aluminium as packing material, the general use of aluminum plate, aluminum and aluminum foil and aluminum plating film.Aluminum plate as a material or system can usually cover materials;Aluminum extrusion and used to make thinning drawing forming tank;Moistureproof aluminum foil are commonly used to do the inner packing or making composite materials, and flexible packaging, etc.
Packing sheet. Antirust aluminium alloy, manganese and magnesium mainly improve the strength of materials, improvement the action such as processing performance;Copper also can improve the strength of materials, and at the same time also can reduce and inch corrosion performance and machining performance;Add zinc, especially when with copper, magnesium, "join the same day, the heat treatment effect is good, but the corrosion resistance and processability will decline;The addition of silicon mainly is to reduce the melting point of aluminum, improving strength and melt liquidity, lower thermal expansion coefficient.>Aluminum foil by thickness of 0.4-4). 7 mm more (0.5 mm) of industrial pure aluminum plate after many cold rolling reduction made of thin and flexible metal BoCai.
A. The characteristics of aluminum materials
Compared to other packaging materials,aluminum material has the following advantages:
- (1) the density of aluminum is very small, 2.7 g/cm, only 35% of the steel.The container is easy to realize the lightweight.The surface of the aluminum can naturally produced a dense layer of 3 oxidation 2 aluminium film, this layer of colorless film can prevent the oxidation of further.
- (2) aluminum avirulent insipidity, accord with packaged food hygiene standards.
- (3) high aluminum surface gloss, easy coloring, printing effect is good.
- (4) made of aluminium easy open lid opening performance is better than that of tinplate easy open lid.
- (5) aluminum light and heat reflection and transmission performance is excellent, canned food heating sterilization can be improved and the effect of low temperature treatment.
- (6) aluminum mechanical performance under low temperature condition can remain the same, especially suitable for frozen food packaging.
- (7) made of aluminum foil composite film completely airtight and opaque, which can effectively protect the food.The strength of the aluminum foil can also improve the aluminum-plastic composite membrane.
- (8) waste can be recycled, can not only save energy consumption but also to prevent the pollution caused by waste, meet the requirements of environmental protection.
But aluminum also exists some shortage, mainly include:
- (1)aluminum production is relatively tinplate and TFS energy consumption is much bigger, so the price is too expensive.
- (2) aluminum nonmagnetic material, so the original use of the equipment of magnetic absorbing materials must be reform.
- (3) aluminum corrosion resistance is poorer, acid, alkali and salt content should not be used for holding food.
- (4) aluminum texture is soft, compared with tin strength is low, in manufacturing and transportation easy due to the collision deformation, surface scratches, and so on and so forth.
- (5) the welding is difficult, so can only use the method of stamping or adhesive manufacturing.
Currently the composite with other materials to make aluminum part up.For example, aluminum foil and paper or plastic compound, can increase the stiffness and tensile strength;To get rid of disadvantages of thin-walled aluminum cans low stiffness, can be in a closed container before filling a small amount of liquid nitrogen, liquid nitrogen vaporization resulting internal pressure can increase the stiffness and the compressive properties of the container;By nitro cellulose and modified polyolefin coating aluminum foil, not only improve the chemical performance of the aluminum foil, kept good printing appearance, but also provides heat to us.
Ii. The application of aluminum material in the packaging
1 aluminum anti-theft caps
China's current packaging liquor, wine, liquor and beverages, etc. Most of them still is given priority to with glass bottles, about 50% of the JiuPingGai use aluminum manufacturing security caps, anti-theft caps in China will grow at an annual rate of 10%, by 2010, anti-theft cover consumption will reach 15 billion, 60000 tons need aluminum strip.Aluminum caps factory in China nearly 200, the year the design capacity of about 9 billion, including 30 imported production lines, production capacity of more than 50, one hundred million, can produce nearly all kinds of bottle cap.More than aluminum bottle cap in a high degree of automation production line processing, so on the strength of the material is very strict, elongation and dimensional deviation, otherwise it will produce rupture or crease in the deep drawing process.In order to ensure the cap shape after printing to cap material surface smooth, no roll marks, scratches, and blotch, generally USES the 8001 a alloy material HI4, 3003 - a - H16, etc.Materials specifications average thickness of 0.20 ~ 43.23 mm, the allowed tolerance + / - 0.1%, width is 449-796 - mm.Aluminum bottle cap material production respectively the use of hot rolled slab or for billet continuous casting and rolling, for cold rolled and rolled.Production practice showed that the effect of anti-theft cover on hot rolling billet is superior to roll casting billet.
2 aluminum-plastic blister packaging
At present, health food and medicine tablet, capsule Packaging in the form of blister Packaging is becoming more common, aluminum-plastic blister is also called blister Packaging, hereinafter referred to as inhibits PTP (PressThrough Packaging).Blister packaging used in aluminum foil is in medicinal plastic PVC (PVC) on the plate of the sealing material, so also known as materials.Almost all the requirements in the modern packaging not pervious to light or high barrier composite aluminum foil products are used as the barrier layer, this is because the aluminum foil have highly dense metal crystal structure, can cut off any gas completely, so the application is very extensive.Material used for pharmaceutical blister packaging is expected to account for the future packing of tablet, capsule drugs of 60% ~ 70%, and is currently one of the best drug packaging materials development prospects.
But at present our country the gap between the quality of the medicinal aluminum foil and import aluminum foil.From the present domestic several production inhibits PTP pharmaceutical packaging enterprise reflects the actual situation of view, there are two main aspects.
(1) number of medicinal aluminum foil pinhole far short of demands.Aluminum foil pinhole defects is penetrating performance, influence on the performance of the aluminum foil blocking, especially for drug packaging, it is easy to make oxygen, water vapor, light penetration and reduce the effects of the drug.Medicinal aluminum foil in the national standard requirements pinhole is not more than 0.3 mm in diameter, 0.1 ~ 0.3 mm in diameter of not more than 1 / m2, the current domestic aluminum rarely achieve this standard.
(2) the medicinal uneven thickness of aluminum foil, low tensile strength.Due to uneven thickness of aluminum foil, easy to cause in the process of mechanical inhibits PTP aluminum foil coating adhesive coating weight coating weight range to meet the standard, and influence of aluminum foil and PVC plate heat Huo strength.Because of the unequal thickness, the tensile strength of low lead to put in the actual processing arise after the winding tension to foil, is not conducive to normal production, these problems need to be raw material manufacturers.
3 aluminum cans
At present.Aluminum cans development has three characteristics, namely the easy pull cover, special cans, the self heating/cooling drinks cans.For a long time, while metals such as aluminum cans packaging has been the challenge of tinplate and PET materials, but due to its light weight, and it has advantage of recycling, still is one of the main forms of beverage packaging, not only to get stable development, but also in constant development and innovation.
Recently, COINS packaging company successfully developed the EPOL (easy open lid).The tank cover using polymer coating of steel ring and corrosion resistant aluminium foil hot Huo, can be used for existing filling equipment, aluminum foil cover is safe to open, more suitable for the elderly and children to use.Due to competition for PET bottle, Japanese drinks on the market in recent years, with the demand of aluminum can gradually reduce, but with the development of new aluminum bottles, aluminum cans demand started to rise again.At present, the stamping force within the industry, and can and mitsubishi materials enterprises have entered the production field of aluminum bottles, shibasaki factory development of aluminum bottles cap is put on the market at the same time.
Daiwa can company to complementary advantages, focus on the PET bottles and aluminum cans and the advantages and disadvantages of the two kinds of beverage packaging container, foster strengths and circumvent weaknesses, take the lead in successfully developed in the world can give back to metal cans for tightness of beverage packaging new container "new bottle type metal cans (new bottles).
New bottles is beyond the existing two piece cans and three cans of structural framework and develop a new packaging container, it is not only used the compound technology of three pieces of metal cans, edge with technology, but also applied the two cans of deep stamping technology made body, and then reusing existing canned contents and match with the threaded cap processing technology, so as to realize the use of metal aluminum, processing formed a bottle mouth and 28 mm diameter drink new metal bottle packaging container.New container with the advantages of metal cans and PET bottles, at the same time overcomes the inherent shortcomings.Considering the environmental problems, new bottles and the use of a single metal aluminum alloy material, on the surface of materials, namely the inside and outside of the body surface are combined to PET film materials;Bottom cover inner surface composite PET film, also added to the outer surface coating PET;With low density PET bottle cap for coating, the surface with coating printing.In aspects of new bottles so can avoid contact with contents, don't require the use of traditional metal cans with various coatings.After the success of the new container production, has been in Australia can industry exhibition in 2000, and in the name of the Japanese company a license from the exhibition of the award.The technology is also very conspicuous in the world, the future demand for aluminum a PET can is likely to expand further.
According to the Japan aluminum cans recycling association survey, due to the four companies into the production field of aluminum bottles, aluminum bottles only sales reached 2002 1.5 billion irrigation, 2.5 times that of last year, on the basis of increased about 20% in 2003.
Beverage packaging market is one of the biggest market for metal packaging market.To improve the brand effect, in addition to use aluminum silver characteristics, the appearance of aluminum cans is becoming more and more important, so the metal molding equipment manufacturers also talking about the aluminium cans, molding and embossing technology.More prone to forming of aluminum and meet the requirements of shape, researchers are exploring extension forming, spinning formingaluminum cans scroll and rheological forming technology, in the near future will be in beer can be used in the first place.
Beer and soda beverage using aluminum cans packaging increases the use of aluminum products, and other industries are also considering using aluminum cans products.Industrial information resources according to the information provided by the company, more than a year ago, Japan's largest aluminium cans manufacturers and aluminium cans company began producing aluminum cans for beer and tea company, the company has produced last year 480 million aluminum cans, plus another two cans manufacturers in Japan, is expected in the next 2 ~ 3 years Japan aluminum cans production will double.Aluminum cans due to light and easy to recycle and get the favour of beverage industry, recently it has spread to other industries and has a tendency to replace the glass and metal bottles.
Experts believe that aluminum new market share will also along with the advancement of the so-called effective packaging, active packaging made new progress.Due to the application of aluminum products to develop new technology, the future demand for aluminum will be further expanded.