Aluminum-based food canning has an unparalleled safety record. Tamper-resistant and tamper-evident packaging provides consumers with peace of mind that their products have been safely prepared and delivered. A vast variety of products are packaged using aluminum in addition to food and beverages: aerosol products, paint and thousands of other items in the consumer products market. In the past half-century, aluminum beverage can manufacturers have lightened the package by reducing the gauge required to fabricate both the cans and their ends.
The first generation of aluminum cans weighed approximately 3 ounces per unit. Aluminum cans bring packaging benefits as well. They are easily formed, resist corrosion and will not rust. Cans made from aluminum easily support the carbonation pressure required to package soda and withstand pressures of up to 90 pounds per square inch. Believe it or not, four six packs can support a 2-ton vehicle. Many new specialty drinks, particularly energy drinks, are delivered in 8.
The microbrew beer canning market is also growing rapidly. Craft beer packaged in aluminum cans maintains a higher quality. The liquid is not affected by light or exposed to oxygen, which can negatively impact taste. The modern aluminum beverage can traces its origins to , when Coors introduced the first all-aluminum, seamless, two-piece beverage container. Recycling was instituted at the same time Coors paid 1 cent for each can returned to the brewery.
Aluminum cans made inroads into the soft drink market in , when Royal Crown Cola released both its RC Cola and Diet Rite beverages in two-piece, ounce aluminum containers.
Legend has it that the professor was called in when the explosions kept the warehouse superintendent, who slept above the warehouse, awake at night. His discovery led to an increase in the time and temperature of boiling during the canning process, as well as greater safety in canned food products.
The National Canners Association was established in to make use of such knowledge and built laboratories to study canning techniques.
The association published reports on sterilization, sources of spoilage and safe cooking times and temperatures. Cliquot Club ginger ale was the first canned soft drink in They used a cone top can produced by Continental Can Company, but the sodas were beset by leakage and flavor absorption problems from the can liner.
It took several years for the glitches to be worked out, but finally in , with an improved design, Continental Can Company and Pepsi-Cola launched the first major soft drink in cans. Twelve ounces sold for ten cents. The James Vernor Company of Detroit introduced its ginger ale in a twelve-ounce flat top can it called the "Vernor Picnic Can" in It was sold in six-can cartons that retailed for 79 cents.
The company expected the pricing of the package to limit its use to outdoor activities such as picnics, camping and boating. Dr Pepper introduced cans into a few select cities that same year. Dr Pepper Company president Leonard Green called it "the most significant packaging development in our history. By circulating hormones through the body, the endocrine system affects nearly every organ and cell. It is responsible for a range of important processes, including:.
By disrupting this vital system, BPA has the potential to cause problems with fertility, development and overall health. It has even be linked to various cancers, and in was banned from being used in baby bottles, sippy cups and any packaging used by infants.
Well, fear not! While BPA is a dangerous chemical, its toxicity to the body all depends on a dose-response relationship. A dose-response relationship outlines that the danger of a substance — be that BPA, theobromine or even sugar — runs parallel to the dose we are exposed to. The short answer is yes, BPA is found in the linings of most aluminium cans and canned foods. Everything in moderation, right? In fact, the exposure limit of BPA — the point after which it becomes dangerous — is nearly impossible to reach given the small amount of BPA present in can linings 4.
In terms of drinking soda, you would have to consume 8, cans per day. To become vulnerable to the harmful effects of BPA, you would need to drink approximately 8, cans of soda a day. Next time you have an empty soda can and some spare sodium hydroxide solution, give the experiment below a try to see the liner for yourself:.
To see how the experiment is performed, you can watch it here. Manufacturers continued to sell some beer in steel cans, even though bottles were cheaper to produce.
The Adolph Coors Company manufactured the first aluminum beer can in Its two-piece can could only hold 7 ounces g , instead of the usual 12 g , and there were problems with the production process.
Nevertheless, the aluminum can proved popular enough to incite Coors, along with other metal and aluminum companies, to develop better cans.
The next model was a steel can with an aluminum top. This hybrid can had several distinct advantages. The aluminum end altered the galvanic reaction between the beer and the steel, resulting in beer with twice the shelf life of that stored in all-steel cans.
Perhaps the more significant advantage of the aluminum top was that the soft metal could be opened with a simple pull tab. The old style cans required the use of a special opener popularly called a "church key," and when Schlitz Brewing Company introduced its beer in an aluminum "pop top" can in , other major beer makers quickly jumped on the band wagon.
While aluminum top cans were sweeping the market, several manufacturers were aiming for the more ambitious all-aluminum beverage can. The technology Coors had used to make its 7-ounce aluminum can relied on the "impact-extrusion" process, The modern method for making aluminum beverage cans is called two-piece drawing and wall ironing, first introduced by Reynolds Metals company in The Reynolds Metals company introduced an all-aluminum can made by a different process called "drawing and ironing" in , and this technology became the standard for the industry.
Coors and Hamms Brewery were among the first companies to adopt this new can, and PepsiCo and Coca-Cola began using all-aluminum cans in The number of aluminum cans shipped in the U.
The modern aluminum beverage can is not only lighter than the old steel or steel-and-aluminum can, it also does not rust, it chills quickly, its glossy surface is easily imprintable and eye-catching, it prolongs shelf life, and it is easy to recycle.
The raw material of the aluminum beverage can is, of course, aluminum. Aluminum is derived from an ore called bauxite. The bauxite is refined and then smelted, and the resulting molten aluminum is cast into ingots The aluminum base, for beverage cans consists mostly of aluminum, but it contains small amounts of other metals as well. A large portion of the aluminum used in the beverage can industry is derived from recycled material.
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