[China Aluminum Industry Network] Aluminum is a kind of metal that is second only to steel production value, but the history of aluminum used as packaging material is only more than 30 years. Over the years, aluminum has been used more and more in packaging, because it has a series of functions. Its density is small, only 1/3 of the steel, light weight; some processing, easy to stamp into a variety of messy shapes; strong corrosion resistance, will not rust; barrier properties, shading, and fragrance Good, can effectively protect the goods; high thermal conductivity, easy to sterilize aluminum cans; silvery white, beautiful color, and high reflectivity to light, easy to print, good printing effect; non-toxic and tasteless, will not be due to aluminum Ion escaping creates an odor in the interior; waste aluminium containers can be re-melted without environmental pollution. Its primary disadvantages are: softer raw materials, lower strength, easily deformed when bumped, poor welding capabilities, seams that cannot be welded, poor corrosion resistance to acids and bases, unsuitable for dressing fruity foods, higher cost .
Aluminum packaging materials are mainly pure aluminum, aluminum alloy and aluminum foil.
(1) pure aluminum plate and alloy aluminum plate
Pure aluminum plate contains more than 99.9% aluminum, and the thickness is usually between 0.25~0.3mm. It is soft and has low strength, so it is less used as a packaging material, but it is also useful as a wine container.
Aluminum alloy plates are processed by adding a small amount of magnesium, manganese, and copper alloys to aluminum. Aluminum alloys commonly used in packaging are aluminum-magnesium alloys and aluminum-manganese alloys, also known as rust-proof aluminum alloys. The strength and hardness of the aluminum alloy plate is obviously improved, the corrosion resistance is strong, the polishing is good, and the surface is kept bright for a long time.
Alloyed aluminum plates are often used to make canned containers. When used in fish and meat cans, they do not appear to be blackened and stained like tin cans; they are more likely to be packaged beverages, which will not cause the appearance of blisters and flavor changes in beverages.
(2) Aluminum foil
Aluminum foil is made of pure aluminum with a purity of 99.5% or more. The thickness is between 0.005 and 0.2mm. It is light and shiny, strong reflective, can be used as thermal insulation packaging; good barrier properties, gas impermeable and water vapor; easy processing, simple processing into a variety of shapes; easy to print, gluing, painting, coloring , Embossing, printing, etc.; adaptable to temperature, stable shape at high or low temperatures; shading, fragrant and so on. The major disadvantage of aluminum foil is that it is not resistant to acids and alkalis, it cannot be welded, and it has low tear strength.
Aluminum foil is widely used in packaging. It can pack articles alone; it is made of composite materials such as paper and plastic film. It can be used in the packaging of food, cigarettes, cosmetics, pharmaceuticals, chemicals, etc. It can be made into cooking bags. , Packing convenience foods and cooking foods.
PVC coated wire, also called plastic coated wire, after high temperature dissolution cooled solid PVC particles uniformly wrapped in high quality black iron wire and galvanized wire through advanced equipment.
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