Centrifugal sifters, also known as a rotary sieves, are screening machines. These powder sifting machines uses centrifugal forces to control and classify powder particles and granules. The housing of the centrifugal industrial sifter is elongated and typically supports a direct or indirect drive motor on one end, and a bearing for the central shaft on the other end. A discharge hopper below the machine housing helps guide the screened powder into the downstream process.
Likewise, a short, flanged outlet on the bearing end of the screener helps remove unwanted contaminants and over size agglomerates from the process. The centrifugal sifter typically comes equipped with two access doors, a side door for quick inspections of the screen, and a bearing end door to allow removal of the screen for maintenance.
The feed inlet and main outlet are off-center and vary in stack up height between 37” – 40” approx. Various fabrications are possible including mild, 304, and 316 stainless steel and screens are available in nylon cloth, woven wire, perforated plate and stainless steel mesh.

Goto Jiangyin Chenyuan Machinery to know more.

Vibratory screeners, also known as flat deck screener, vibratory sieves or vibrating screens, can come in different shapes and sizes. One of the more common designs are circular decks that support steel or nylon mesh flat screens. It is not uncommon to see 2 decks stacked on top of each other to provide a degree of classification in your screening process.
An offset motor is directly attached to the outside of the screener to provide the vibration that agitates the powders for the screening action. An inlet on the top of the dust cover and an outlet directly below the screener provide the inline throughput of powders and granules.
Vibrating screeners have an inlet and outlet directly in line. Stack up heights vary from 15” to 25.5” and various fabrications are possible including mild, 304, and 316 stainless steel. Vibrating sieve mesh can be made in various micron sizes from wire-cloth, steel-wire, nylon mesh, and perforated plate.

Centrifugal industrial sifters get their name from the spinning action of the paddles inside the sieving chamber. The screening process starts at the inlet where material is dropped into a mini-feed auger that pushes the material into the cylindrical screening chamber.
A nylon mesh screen is fitted and clamped onto a screen cage for support and sturdiness. As the powder encounters the centrifugal forces of the spinning paddles, the particles hit the surface of the mesh of the industrial sifter. These paddles spin at a rate typically in the range of 600 – 700 RPM. All undersized particles, or “good” material, passes through the screen separator and down into the central discharge hopper. Anything oversize, such as foreign detritus or hard lumps, are carried down to the end of the screen basket and out the oversize “rejection” outlet, removing these undesirable particles from the process.

Common applications involve flour sifting, sugar screening, and various applications in food and chemical industries.

Centrifugal sifters, by the spinning action of the paddles, offer a mild de-agglomerating action. These machines are often used in food production to help break apart raisins, as well as other types of dried fruits. Any type of small lumps that can be described as friable (e.g., compression lumps in sugar and flour) a centrifugal sifter can most likely handle. The centrifugal forces can also help keep nylon mesh clean from near size particles plugging the screen. Therefore, the machine does not need any other type of mechanical anti-blinding mechanism. Because of this, it is possible to screen materials that contain a low percentage of fat and moisture, for example, screening pet food meal before extrusion.
Also possible with a centrifugal sieve is the ability to scalp small percentages of over-size material for recycling back into the upstream process for a second pass through on milling equipment (refered to as scalping). Finally, these machines are known for quiet operation, adding to worker safety on the processing floor.

Vibratory screeners are great for high feed rates and quality control of powders, where a simple coarse screen allows 99.9% of the material to pass straight though to the down stream process. They are compact, and the inlet and outlet flanges are inline which makes this screener easy to retrofit into existing processes with restrictive height clearances.
There are also fewer components which reduces downtime for cleaning and maintenance. Also, screens can be more easily swapped out with an on-hand spare replacement.
Finally, these screen separators are less prone to damage when checking for foreign contaminants, like nuts and bolts, since the mechanical action is located on the outside of the housing.
Both types of screen separators can be designed for gravity feed and pneumatic conveying applications. There is a wide selection of micron mesh sizes based on the application.

Both types of screens can be designed for gravity feed applications or on pneumatic conveying lines. There is a wide range of micron mesh sizes to suit the application. Easy Clean hygienic versions of both screens are also available: ECD vibrating screen and ECD centrifugal screen.

To help your supplier determine what is the best strainer / screener to choose from, its good to know the following information:

• Feed rate
• Particle Size Distribution
• Material Characteristics
• Fat and Moisture Content
• Purpose of the industrial sifter

In order to determine which type of separation equipment is best for your process, consult with one of our knowledgeable sales staff today!

Tech Team · Kintek Solution

Updated 7 months ago

How to Choose the Right Sieve Size? Ensure Accurate Particle Size Analysis

Choosing the right sieve size is crucial for accurate particle size analysis and efficient material separation. The process involves understanding the material properties, the required particle size distribution, and the compatibility of the sieve with the sieving machine. Sieve sizes are typically defined by mesh numbers or aperture sizes, with finer sieves measured by the number of openings per linear inch. Additionally, factors like the type of material, sample size, and the capabilities of the sieving machine (such as filling capacity and sieve diameter) must be considered to ensure optimal performance and accurate results.

Key Points Explained:

1. Understanding Sieve Size Standards:

   • Sieve sizes are defined using either imperial (inch) or metric (millimeter) units. For apertures 1/4 inch (6.3 mm) or larger, sieve sizes are typically specified in inches. Finer sieves are described by mesh numbers, which indicate the number of openings per linear inch. For example, a No. 4 Sieve has four openings per inch.
   • This standardization ensures consistency in particle size analysis across different applications and industries.

2. Material Characteristics:

   • The type of material being tested is a critical factor in selecting the appropriate sieve size. Coarse materials like aggregates require larger sieve openings, while fine materials such as flour or powders need finer sieves with smaller apertures.
   • Understanding the particle size distribution of the material helps in choosing the right sieve sizes to achieve the desired separation and analysis.

3. Sieve Shaker Compatibility:

   • The diameter of the sieves must match the specifications of the sieve shaker. Different shakers are designed to accommodate specific sieve diameters, and using incompatible sizes can lead to inaccurate results or damage to the equipment.
   • The sieve shaker should also be selected based on the material type and particle size. For example, shakers designed for fine powders may not be suitable for coarse aggregates.

4. Filling Capacity:

   • The filling capacity of the sieving machine must align with the sample size. Overloading the sieve can lead to inefficient separation and clogging, while underloading may result in insufficient material for accurate analysis.
   • Ensure that the sieving machine can handle the required capacity for your specific application to maintain optimal performance.

5. Frame Material Considerations:

   • The material of the sieve frame affects its durability and suitability for different applications. Common materials include stainless steel, brass, and plastic. Stainless steel is preferred for its durability and resistance to corrosion, making it suitable for harsh environments.
   • The choice of frame material should be based on practical considerations such as cost, longevity, and the specific requirements of the application.

6. Application-Specific Requirements:

   • Different industries and applications may have unique requirements for sieve sizes and equipment. For example, the construction industry may prioritize sieves for coarse aggregates, while the food industry may focus on fine sieves for powders.
   • Always consider the end-use and regulatory standards when selecting sieve sizes and equipment.

By carefully evaluating these factors, you can select the appropriate sieve size and equipment to ensure accurate and efficient particle size analysis for your specific needs.

Summary Table:

Factor Key Considerations Sieve Size Standards Imperial (inch) or metric (mm) units; mesh numbers for finer sieves. Material Characteristics Coarse materials need larger openings; fine materials require smaller apertures. Sieve Shaker Compatibility Match sieve diameter and shaker specifications; consider material type and particle size. Filling Capacity Align sample size with machine capacity to avoid overloading or underloading. Frame Material Choose stainless steel, brass, or plastic based on durability and application needs. Application Requirements Consider industry-specific standards and end-use requirements.

Need help selecting the right sieve size for your application? Contact our experts today for personalized guidance!

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