The Rotary Sifter also known as Centrifugal Sifter works on Principal of Centrifugal force. The Rotary Sifter enables screening by pushing the product particles through the mesh using a screw conveyor or rotating paddles.
The round vibrating screen also known as gyratory sifter works on gyro principal. Eccentric weights are applied on top & bottom of shaft that rotates to generate 3-Dimensional movement.
Vibro sifter enables screening of products through the vibration generated by motor. Here there isn’t any involvement of rotating parts.
Below are the valuable points that will guide what to choose between Centrifugal Sifters & Round Vibro Separators & why!
Low & Light Bulk Density Products
If the product is of low bulk density & of lightweight, Centrifugal Sifter would be the most suitable machine for the screening process.
The product that has lightweight & low bulk density if sieved in Round Vibro Separator will not pass through easily & would keep on traveling & jumping of the mesh screen as it would not get the required pressure & sieving process would not give required output.
If it is sieved in Centrifugal Sifter, it will be getting pressure from the centrifugal force generated through rotation of screw conveyor & this will help low bulk density products to travel through mesh screen area easily resulting into maximum efficiency while sieving process.
To sieve & screen low bulk density & light-weighted products/applications such as Talc powder, Pigments, Silica Sand & more one should always prefer Centrifugal Sifters.
Gradation
The products or applications that needs to be graded or classified into different sizes would be only fit to be graded with Round Vibro Separators – as they can be built with 4 level
The products or applications that needs to be graded or classified into different sizes such as tea, minerals, etc. can be graded only with Round Vibro Separators as they can be customized with 4 layer of decks that can give 5 level of Gradation.
Gradation is not possible with Centrifugal Sifters as it can only accommodate single mesh screen.
So, for the products/applications where gradation is required, round vibro separator would be the optimal option.
Products with more moisture content that forms lump easily.
Few applications & products such as coffee, flours, soya lecithin powder, spices powder, etc. have high percentage of moisture & form lumps easily. To sieve or screen such products experts recommend the use of Centrifugal sifters rather than round vibro sifters.
Main reason to choose Rotary sifters over round vibro sifters for products that form lumps easily is less product loss. While screening with centrifugal sifters the lumps breakdown due to rotation of screw conveyor that generates centrifugal force which in return enables zero product loss while in round sifter lumps stay over the mesh area & are thrown out from outlet which in return results into product loss.
Screening through fine mesh.
Few applications & products such as metal powder, speciality chemical, flavours, etc. have very fine size particles & so to screen/sieve such products finest mesh is required.
For screening fine particle products, Round Vibro Separator could be the only solution as our Round Vibro Separator with Ultrasonic System can sieve up to 500# mesh while centrifugal sifter has a limit of sieving up to 100# mesh only.
Liquid solid separation.
For the applications such as pulp slurry, wastewater, etc. that has to separate solid from liquid Round Vibro separators are considered to be the most viable option.
While filtering liquid or slurries for separating solid contaminants/particles from liquid more area is required so that liquid can properly spread over that space. Fine mesh is also required as liquid can pass through easily & leave the solid part above the mesh. It is possible with round Vibro sifters only.
If we try to filter the liquid from Centrifugal sifters, chances achieving poor- & low-quality end products are high as during the separation process mixing of liquid & solid are more inside the chamber.
Dust & Noise free operation.
Today many industries including food, pharmaceutical, minerals, chemical & more have to follow various act, standards & law that ensures safety norms for people & quality norms for products.
In industries like food & pharmaceutical, small contamination could severely affect the quality of the final product & that could be deleterious for end-user.
To avoid any such small contamination that could be either human-generated or airborne, centrifugal sifter is the best choice as it can provide a totally enclosed & dust-free environment while screening & sieving process if installed in the proper manner.
The reason it can provide a totally enclosed environment is it’s working principle. It works on centrifugal force & does not generate any vibration so rigid connection is possible at inlet & outlet, while in round Vibro separators work on vibration & only flexible connections are possible at inlet & outlet. Flexible connection increases the chances of leakage.
In industries like chemical & pigment, minerals, etc. during the manufacturing process hazardous substances are used & inhaling or coming in direct contact with such substances might be dangerous for operators & labors working over there. So, for sieving or screening, such materials totally enclosed system is recommended by industry experts.
Some industries also follow safety norms that allow only machines that generate noise up to standard DB. The industries & companies who follow such norms in accordance to safety laws should always consider Centrifugal Sifter as a first option as its noise level is less than 80DB which enables noise-free operation.
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