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              Your present location:Home >> News >> Industry Items >> The application of aluminum material in packaging industry
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              The application of aluminum material in packaging industry

              Number of visits: Date:3/25/2017

                Aluminum is a resource-rich white light metal that is second only to steel in the world. Its application in the packaging industry is the highest in nonferrous metals. Aluminum is used as a packaging material and is generally used in aluminum, aluminum and aluminum foil as well as aluminum coated films. Aluminum plates are usually made of cans or covered materials; The aluminum blocks are used to create a can of extruding and thinning. Aluminum foil is commonly used to make moisture-proof interior packaging or make composite materials and soft packaging.

                The packaging materials are made of anti-rust aluminum alloy, and manganese and magnesium are mainly used to improve the strength of materials and improve the performance of processing. Copper can also increase the strength of the material, but also reduce the performance of the etching and processing. When adding zinc, especially with copper and magnesium, the heat treatment effect is better, but corrosion resistance and processing will decrease. The addition of silicon is mainly to reduce the melting point of aluminum, increase the strength and melt liquidity, and reduce the thermal expansion coefficient. The aluminum foil is a flexible metal sheet made from a series of cold rolling, which is 0.4 to 4).7mm (more than 0.5 mm).

                One. The characteristics of aluminum materials

                Compared to other packaging materials, the aluminum material has the following advantages:

                (1) aluminum is very small, 2.7 grams per cm, only 35 percent of steel. This makes the container easy to quantify. The surface of aluminum can naturally produce a dense layer of aluminum oxide film, which prevents oxidation from further.

                (2) the aluminum is non-toxic and tasteless, conforming to the hygiene standards of packaged foods.

                (3) the aluminum surface is high gloss, easy to colouring, and the printing effect is good.

                (4) the open cover that is made of aluminum is better than the tin plate.

                (5) excellent performance of aluminum to light, heat, and conduction, which can improve the effect of heat sterilization and low temperature treatment of canned food.

                (6) the mechanical properties of aluminum can remain unchanged at low temperature, especially for the packaging of frozen foods.

                (7) the composite film made of aluminum foil is completely impervious to air and light, and can effectively protect the inside food. Aluminum foil can also improve the strength of the composite film.

                (8) waste can be recycled and reused, which can save energy consumption and prevent the pollution caused by waste, and meet environmental protection requirements.

                But there are some disadvantages to the aluminum material, mainly:

                (1) the production of aluminum is much more expensive than that of malinic iron and TFS, so the price is more expensive.

                (2) aluminum is a non-magnetic material, so the original equipment used to absorb raw materials must be modified.

                (3) aluminum materials are less resistant to corrosion, and should not be used for food that is acidic, alkaline and salty.

                (4) the aluminum material is softer, the strength is lower than that of the tin plate, and the surface abrasion and the surface abrasion occur in the manufacturing and transportation.

                (5) it is difficult to weld aluminum, so it can only be made by stamping or sticking.

                It is now possible to make up for some of the disadvantages of aluminum by combining with other materials. For example, the combination of aluminum foil and paper or plastic can increase its 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.

                The application of aluminum material in packaging

                Aluminum anti-theft cap

                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. China has nearly 200 aluminum bottling plants, with an annual design capacity of about 9 billion, with 30 production lines, more than 5 billion capacity, and nearly 100 kinds of bottle caps. 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 make sure that the bottle cap is formed and ready to be printed, the surface of the cap is flat, no rolling marks, scratches and fouling, the commonly used alloy materials are 8001 HI4, 3003 H16 etc. The thickness of the material is 0.20 ~ 43.23 mm, and the tolerance is allowed to be up to 0.49-796mm. The production of aluminum bottle caps can be made of hot rolled or continuous casting and rolled by cold rolling. The production practice shows that the hot rolling stock is better than the cast steel in the use of the cover.

                2 aluminum-plastic bubble wrap

                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). The aluminum foil wrapped in bubble wrap is the sealing material on the hard piece of plastic polyvinyl chloride (PVC), so it is also called the covering material. 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 the quality of the Chinese medicinal aluminum foil is far from the imported aluminum foil. In the present situation of several enterprises that produce PTP pharmaceutical packaging, there are two main problems.

                (1) the number of pinholes in the medical aluminum foil is far from being required. 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 thickness of the aluminum foil is not uniform, and the tensile strength is low. 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. The development of aluminium beverage can has three main features, namely, the easy pull lid, special type can, self-heating/self-cooling drink 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, the company has developed EPOL (open cover). 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. The new containers both have the advantages of metal cans and PET bottles, and overcome the inherent disadvantages of both. 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; A composite PET film is added to the inner surface of the lid, and the outer surface is coated with PET. The bottle cap is coated with low density PET, and the outside surface is printed and coated. The inner plane of the new bottle can avoid contact with the content, without the use of various coatings that are traditionally used in metal POTS. After the success of the new bottle test, it was exhibited in the 2000 Australian bottling industry exhibition and won the award in the name of the Japanese company. The technology also stands out internationally, and the demand for a PET can be expanded further in the future.

                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.

                The beverage packaging market is one of the largest markets in the 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 forming aluminum cans scroll and rheological forming technology, in the near future will be in beer can be used in the first place.

                The use of aluminum cans for drinks such as beer and soda has increased the use of aluminium products, while other industries are considering using aluminium cans. 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. Aluminium cans, which are popular in the beverage industry for their lightweight and recyclable products, have recently spread to other industries and have replaced glass bottles and metal bottles.

                three

                Experts say the new market share of the aluminum material will also make new progress with the so-called active packaging. Due to the application of new technologies for aluminum products, the demand for aluminum will be expanded further.

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