Packaging (packaging) in order to protect products during circulation, facilitate storage and transportation, and promote sales, the overall name of containers, materials and auxiliary materials used according to certain technical methods; also refers to the use of containers, materials and auxiliary materials for the purpose Certain technical methods and other operational activities are applied during the process of the object. Marketing packaging focuses on planning strategies and becomes a broad sense of packaging. You can also dress someone or something or try to help him be perfect in a certain way.
At present, efforts are being made to promote environmental protection during the accelerated upgrading and transformation of various industries. In addition to eliminating high-energy-consuming and high-pollution products and using environmental protection equipment, packaging materials are also beginning to be streamlined and reusable, and aluminum packaging has emerged.
Aluminum is a resource-rich white light metal, and its output is second only to steel, and its application in the packaging industry ranks first among nonferrous metals. As packaging material, aluminum generally uses aluminum plates, aluminum blocks, aluminum foil, and aluminum-coated films.
➤ Aluminum plate is usually used as can material or lid material;
➤Aluminum block is used to manufacture extruded and thinned cans;
➤ Aluminum foil is generally used for moisture-proof inner packaging or composite materials and flexible packaging.
Performance characteristics of aluminum packaging
Aluminum packaging materials have excellent mechanical properties and high strength
Therefore, the aluminum packaging container can be made into a thin-walled packaging container with high compressive strength and not easily damaged. In this way, the safety of the packaged products is reliably guaranteed, and it is easy to store, carry, transport, load and unload and use.
Excellent processing performance of aluminum packaging materials
The processing technology is mature and can be produced continuously and automatically. Aluminum packaging materials have good ductility and strength, and can be rolled into sheets and foils of various thicknesses. Sheets can be stamped, rolled, stretched, and welded to form packaging containers of different shapes and sizes; foils can be combined with Plastics and low grades are compounded, so metals can fully exert excellent and comprehensive protection performance in various forms.
Aluminum packaging materials have excellent comprehensive protection performance
The water vapor transmission rate of aluminum is very low, completely opaque, and can effectively avoid the harmful effects of ultraviolet rays. Its gas barrier, moisture resistance, shading and fragrance retention greatly exceed other types of packaging materials such as plastics and paper. Therefore, the gold and aluminum materials can maintain the quality of the goods for a long time, and the shelf life is long, which is especially important for food packaging.
Aluminum packaging materials have a special metallic luster
It is also easy to print and decorate, which makes the product look luxurious, beautiful and marketable. In addition, aluminum foil is a very ideal trademark material.
Aluminum packaging materials are recyclable
In terms of environmental protection, it is an ideal green packaging material. As a packaging material, aluminum is generally made into aluminum plates, aluminum blocks and aluminum foils, and aluminum-plated films. Aluminum plates are usually used as can materials or lid materials; aluminum blocks are used to make extruded and thinned cans; aluminum foil is generally used for moisture-proof inner packaging or composite materials and flexible packaging.
In beverage filling, cans for canned drinks are a good example. The advantages of aluminum materials in environmental protection and production cost reduction are gradually emerging. At present, the development of aluminum beverage cans has three major characteristics: namely, easy-open lids, special cans, and self-heating/self-cooling beverage cans. For a long time, although metal packaging such as aluminum beverage cans has been challenged by tinned plates and PET materials, due to its light weight and recyclable advantages, it is still one of the major beverage packaging forms and has not only been developed steadily. And it is also constantly developing and innovating.
The beverage packaging market is one of the larger markets in the metal packaging market. In order to improve the brand effect, in addition to the silver-white characteristics of aluminum, the shape of aluminum cans is also increasingly important, so manufacturers of metal forming equipment are also discussing aluminum can forming and embossing technologies. Because aluminum is easier to form and reach the required shape, researchers are exploring aluminum can reel expansion forming, spin forming and flow forming technologies, which will be used first in beer cans in the near future.
The use of aluminum can packaging for beverages such as beer and soda has increased the use of aluminum products, and other industries are currently considering the use of aluminum can products.
Aluminum anti-theft bottle cap
At present, most of the domestic packaging liquor, wine, medicinal wine and beverages are still dominated by glass bottles. About 50% of the wine bottle caps are made of aluminum anti-theft caps. Our national defense of theft caps will grow at a rate of 10% per year. It is expected that By 2010, the amount of anti-theft caps will reach 15 billion, requiring about 60,000 tons of aluminum strip. There are nearly 200 aluminum cap production plants in my country, with an annual design capacity of about 9 billion, of which 30 production lines have been introduced, with a production capacity of more than 5 billion, which can produce nearly one hundred kinds of caps.
Most aluminum bottle caps are processed on a production line with a relatively high degree of automation, so the strength, elongation and dimensional deviation of the material are very strict, otherwise it will cause cracks or creases during deep drawing processing. In order to ensure that the bottle cap is easy to print after molding, the surface of the bottle cap material is required to be flat, without rolling marks, scratches and stains. The alloy materials generally used are 8001-HI4, 3003-H16 and so on. The material specifications are generally from 0.20 to 43.3mm thick, with a tolerance of ±0.1% and a width of 449-796mm. The production of aluminum bottle cap material can be made by hot-rolled billet or continuous casting and rolling billet, which are made by cold rolling. Production practice shows that the hot rolled billet is better than the cast rolled billet in the use effect of the anti-theft cover.
Aluminum-plastic blister pack
At present, the packaging of tablets and capsules for health foods and pharmaceuticals is more and more common in blister packaging. Aluminum-plastic blister is also called blister packaging, or PTP (PressThrough Packaging) for short. The aluminum foil used in blister packaging is a sealing material densely attached to a rigid plastic PVC sheet, so it is also called a lid material. Almost all products in modern packaging that require opaque or high-barrier composite materials use aluminum foil as the barrier layer. This is because aluminum foil has a highly dense metal crystal structure that can completely block any gas, so it is widely used. It is expected that the packaging used for pharmaceutical blister materials will account for about 60%-70% of the packaging of tablets and capsules for future medicines, and it is one of the pharmaceutical packaging materials with better development prospects.
However, the gap between the quality of my country’s medical aluminum foil and imported aluminum foil is far away. Judging from the actual situation reflected by several domestic manufacturers of PTP pharmaceutical packaging, there are mainly two problems.
(1) The number of medicinal aluminum foil pinholes is far from the requirements. Aluminum foil pinholes are penetrating performance defects, which affect the barrier properties of aluminum foil, especially for pharmaceutical packaging, it is easy to penetrate oxygen, water vapor, and light to reduce the efficacy of drugs. In the national standard for medicinal aluminum foil, the diameter of the pinhole is not more than 0.3mm, and the diameter of 0.1-0.3mm cannot be more than 1 per m2. At present, domestic aluminum foil rarely meets this standard.
(2) The thickness of the medicinal aluminum foil is uneven and the tensile strength is low. Due to the uneven thickness of the aluminum foil, it is easy to cause the coating amount of the adhesive to reach the standard coating amount range during the mechanical coating process of the PTP aluminum foil, which further affects the thermal strength of the aluminum foil and the polyvinyl chloride hard sheet. Due to uneven thickness and low tensile strength, foil breakage occurs after tension is applied during unwinding and rewinding in actual processing, which is not conducive to normal production. These problems require attention from raw material manufacturers.
Insufficiency of aluminum materials and remedies
➤Compared with tinplate and TFS, aluminum production consumes much more energy, so the price is more expensive.
➤ Aluminum is a non-magnetic material, so the original equipment that uses magnetic to absorb raw materials must be modified.
➤Aluminum materials have poor corrosion resistance and should not be used to contain acidic, alkaline and salty foods.
➤The aluminum material is softer and has lower strength than tinplate. It is easy to deform and scratch the surface due to collision during manufacturing and transportation.
➤ Aluminum welding is difficult, so it can only be manufactured by stamping or bonding.
At present, some of the shortcomings of aluminum can be compensated by compounding with other materials. For example, the compound of aluminum foil and paper or plastic can increase its rigidity and tensile strength; to overcome the shortcomings of low rigidity of thin-walled aluminum cans, a small amount of liquid nitrogen can be filled before closing the container, and the internal pressure generated by the vaporization of liquid nitrogen can be increased The rigidity and pressure resistance of the container; the aluminum foil coated with nitrocellulose and modified polyolefin not only improves the chemical properties of the aluminum foil, maintains a good printing appearance, but also provides heat-to-seal properties.