The Water Filling Machines can using gas pressure
A beverage can, is a container manufactured from aluminum or steel designed to hold a single serving of a beverage. Beverage cans are also made of tinplate: see Cans are filled before the top is crimped on. The key engineering issue is that can walls are about 90 micrometers thick, so empty cans are light, weak, and easy to damage. The filling and sealing operations need to be extremely fast and precise. The Water Filling Machines can using gas pressure, purges the air, and lets the beverage flow down the sides of the can. The lid is placed on the can, then crimped in two operations. A seaming head engages the lid from above while a seaming roller to the side curls the edge of the lid around the edge of the can body. The head and roller spin the can in a complete circle to seal all the way around. Then a pressure roller with a different profile drives the two edges together under pressure to make a gas-tight seal. Filling machine usually have pressurized gas inside, which makes them stiff enough for easy handling.
There were once cans in the United States called cone tops and crowntainers which had tops that were conical, rather than flat. Cone top cans were sealed by the same caps that were put on bottles. There were three types of conetops — high profile, low profile, and j-spout. The low profile and j-spout were the earliest, dating from about 1935, the same as the flat top cans that had to be opened with beverage filling machines . The crowntainer was a different type of can that was drawn steel with a bottom cap and the favorite of some collectors. Various breweries used crowntainers and conetops until the late 1950s, but not every brewery used every variety mentioned above. Crowntainers were developed by Crown Cork & Seal, now known as Crown Holdings, Inc., a leading beverage packaging and beverage can producer. This design returned to use in 2008 for packaging Coca-Cola's Caribou Coffee beverage.
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