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HomeMaterials By SICBottle & Can Production (beverage containers) (3221-BC)

Bottle & Can Production (beverage containers) (3221-BC)

 
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Bottle & Can Production (beverage containers) (3221-BC)
Glass containers have the simplest manufacturing process of modern containers. Higher purity silica from sand is mixed with glass cullet (crushed glass from any of a variety of sources) and melted in furnaces. The glass liquefaction is enhanced by adding salts like soda ash (sodium carbonate) to the melt. Using glass cullet as an input product is actually preferred to pure silica, because its lower viscosity upon heating allows the furnaces which co-melt the cullet and sand to operate at lower temperatures. Several other salts are added to improve the hardness, finish, and handling qualities of the finished product, and the glass is ready for the final forming steps. The liquid is cooled to an intermediate viscosity, machines cut pieces of the viscous glass liquid off, and the bottle shape is formed by blowing or press forming the glass into molds. The glass is cooled, annealed, inspected and ready for the rest of the filling and canning process. Aluminum beverage containers are presently made by the Draw and Iron method, which is an efficient way to produce two piece metal containers which have an internal pressure, such as carbonated beverages (whose CO2 partial pressure keeps the can supported), and beverages which have a nitrogen pressurized headspace. The pressure is needed because the side walls of the can are too weak to allow tall stacking of the containers without additional support. Sheets of aluminum are fed into a press which forms cups from the sheet by stamping from the top. The shape of the bottom is formed, and the container is cut from the roll and trimmed. At this stage the cans are washed and dried. Decoration is applied, and an organic polymer is applied to the interior of the can to protect the contents from the relatively reactive aluminum. The diameter at the top of the can is reduced by a rolling step to reduce the size of the top used, which enhances container economy. The cans are filed and the perforated aluminum top is attached to the can.

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