Unit_4_-_Metal_Packaging - Unit 4 Metal Packaging Metal has...

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4. 1 Unit 4 Metal Packaging Metal has been used as a major packaging material for two centuries. In this unit we will discuss its history as a packaging material, metals used for packaging, types of metal packages, can manufacturing processes, and foil. 4.1 History of Metal Packaging The history of metal packaging is quite involved, so I am not going to describe it much here (PKG 221 is the course on metal packaging and will have more detail). However, one notable accomplishment is the invention of the food can. In 1810, Peter Durand, an Englishman, developed a process to make metal cans for canning food. Durand made his container by rolling a rectangular piece of tin plated wrought-iron sheet into a cylindrical shape, soldered the side seam, and soldered a circular piece of tin plated sheet onto one end. 4.2 Advantages of Metal Packaging Compared to other packaging materials, metal has the following advantages: Highest temperature tolerance Highest physical strength Most durability Excellent light, gas, and moisture barrier properties Stiffness Higher production and filling speeds (this is why so many foods and beverages are still packaged in cans) 4.3 Disadvantages of Metal Packaging There are also a few disadvantages of metal packaging compared to other materials, particularly plastics. These include that metal: Is heavy Can’t form into complex shapes such as bottles (although currently there are some new aluminum bottles), pouches, and closures Can’t be colored Can’t be heat sealed 4.4 Types of Metal Packaging Food and beverage cans are probably the most common and familiar types of metal packages. Metals are also used for other types of packages though and include drums, pails, closures, trays, racks, pallets, and strapping. They are also used as foil or as a metalized coating on plastic and paper. The most common metals used for packaging are steel and aluminum. 4.4.1 Steel Steel has been used in industry for more than 200 years. It is made from iron by purification, controlling the carbon content, and a dding other materials to make “alloys”.
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4. 2 There are many different kinds of steel and that used for packaging generally has a carbon content of 0.1% - 1.5%. Steel is a heavy and susceptible to corrosion, but it also has many advantages. Steel is: Strong Relatively inexpensive compared to other packaging materials Non-toxic An excellent barrier to moisture, gas, and light Magnetic it can be separated from aluminum for recycling The most common types of steel packages are the cans used for foods such as soup, vegetables, fruit, and beans. The use of steel for beverage containers has almost been eliminated in the US because it has been replaced by aluminum and plastic. Steel is also used for larger industrial style packages such as pails and drums as well as racks for transporting automotive parts. Steel is also used for other packaging parts such as closures for glass containers and strapping for pallets. Steel Cans for Food Products
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Unit_4_-_Metal_Packaging - Unit 4 Metal Packaging Metal has...

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