Although the term "circular sieves" most often refers to the kitchen tool, it also is defined as those tools used in other applications such as the mining industry. In the laboratory, it may be used in the chemical process. Sieves come in various sizes, and with various levels of filtering capacity from microscopic levels to mineral ore screening. Some of the more common sieve uses are described below.
In the kitchen, a sieve-like device is used in sifting various ingredients. One example of these ingredients is flour. By sifting the flour, it ensures a more even batter. It also adds air to the mix so that cakes are more moist and don't have lumps of flour or sugar in the finished product.
Sieves may be called by other names, depending on the use made of them. For example, in the kitchen you may use a sifter, a colander, a drainer or a strainer for specialized purposes, but with the same essential purpose. Sometimes the purpose is to separate solids from liquids, such as when draining pasta.
Beekeepers use a type of sieve to extract honey from the frames and honeycombs. This sieve might be a rotating drum like device that spins. The centrifugal force sends the honey away from the center of the rotation where it might be further processed and purified. Honey extractors may be on a vertical plane or a horizontal plane. These devices can be operated through electrical motors or by mechanical power.
In the mining industry, large container sieves might be used, These might operate both by vibration actions and by spinning. The larger ore chunks can be sorted and separated. They are then broken or ground into smaller particles so that the smelting process yields more uniform results. As might be expected, these sieves must be large and solidly constructed. The grading process may also use a flat conveyor belt type of screening station. In plants where gravel is processed and sold, rock can be sorted by size using a sieve. Everything from sand to pea gravel to boulders for garden use can be size sorted.
Circular devices that use the concept of centrifugal force can be used in sewage treatment plants to separate liquids from solids. When food products go through a washing process, the water is drained off in one direction while the cleaned foods go another direction. Canned peas and beans are a good example of this type of sieve.
Anyone who has worked in a laboratory knows how important a sieve-like device can be to isolate and study disease organisms and blood cells. Chemical compounds and processes may require the use of a sieve to separate different sized molecules. The size of a virus can help to determine what type of virus it is.
Very specialized types of circular sieves are available on the Internet. Because the global market is much larger than just one area or even one country, competition helps to keep the prices down. Regardless of what type of device you need, check online to find your best options.
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