Aluminum Foil

Innovation Info
Inventor (s): 
Hans Christian Oersted
Year Invented: 
Image Credit: 
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Who invented aluminum foil?

Hans Christian Oersted invented aluminum foil in 1825.

When was the aluminum foil invented?


When was the patent granted?

On April 2, 1889 patent was granted to the aluminum foil by Charles Martin Hall.


Who was the patent granted to on the Aluminum Foil?

  • Charles Martin Hall


How does the invention of aluminum foil help?

  •  Aluminum foils have shiny and matte sides. Aluminum foil is a sheet which can be rolled and during the final pass of rolling the shiny side of the foil is produced. In the final pass rolling two sheets are rolled at a time in order to avoid the difficulties caused to handle the foil gauge.
  •  The reflectivity of bright aluminum foil is 88% and dull embossed foil is 80%.
  •  Aluminum foils are extensively used in foods and pharmaceutical packaging because it acts as a obstacle for moisture and bacteria. Aluminum foils are used for making long life packs for drinks and dairy products without the need of refrigerators.
  •  Aluminum foils are frequently used as thermal insulation, heat exchangers and cable liners.
  •  Aluminum foil is immersed in water and it is used remove rust from steel and polishes the surface by rubbing it with hand.
  •  The extensive use of aluminum foils have been criticize by environmentalists because of the high resource cost of extracting aluminum and large amount of electricity used to process bauxite ore. But this cost can be reduced via recycling.


What is the aluminum manufacturing process?

  •  The third most common element in the earth’s crust is aluminum. Commonly aluminum is found within bauxite ore. It comprises up to 60 percent of the bauxite itself.
  •  After mining of the ore it can be crushed and mixed with a sodium hydroxide solution then ground into a fine powder. These resulting particles are mixed with water and then it is heated to more than 500 degrees Fahrenheit under 50 pounds per square inch of pressure. After completing several hours the sodium hydroxide has been eat away the aluminum compounds and again dissolving them.
  •  Now the resulting mixture is moved into the holding tank where the non-aluminum solids are settled at the bottom of the tank be because of the aluminum particles have been completely dissolved in the sodium hydroxide solution, it is able to be pumped through a filtration system.
  •  Now this aluminum-rich liquid is then moved into another holding tank where the aluminum crystals are placed at the top of the liquid. Now the resulting solution is pumped through a kiln and then it evaporates the water and leaves pure aluminum crystals. These crystals are then cooled and must be smelted.
  •  Aluminum crystals are crystals smelted into a usable form under Hall- Heroult process. In this process a reduction pot and an electrode must be used. Reduction pot is basically a large steel container and is lined with carbon which acts as a conductor. And the electrode is placed above the reduction pot. Now the current is passed through the electrodes, which are submerged within the electrolytic solution.
  • When current is passed through the liquid, it separates the aluminum atoms from remaining constituent atoms. The pure aluminum atoms settle at the bottom of the reduction pot. The aluminum which is coming from the smelting process is moved into the furnace and molded into bars. Finally these bars are cooled and distributed to manufactures.
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