![]() Furthermore, our experience indicates the RoTap is limited in accurately measuring fine particle sizes. Customers need to determine if they want these angular particles to be in the product or not. This also indicates less oversize in the product than is actually there. This leads to a larger percentage of fines measured in the product than there really is. Without an outlet on the sieves, angular particles are able to vertically pass through the screen. For angular particles in particular, the RoTap can lead to differing results. There are drawbacks to this method as well. The combination of energy and motion of the sieve method allow for particles to pass through the screen and can determine the amount of fines or oversized particles in a certain product fraction. For coarse and granular powders, the RoTap/sieve analysis method is the most accurate way to determine particle sizes. ![]() Sieve analysis is designed to emulate screening on a lab scale and claims to provide accurate results down to 44 microns. The typical ASTM standard calls for the test to be performed on one hundred grams of powder for a period of fifteen minutes. This is calculated by the amount of material retained on each test sieve after running the RoTap machine. The RoTap is a method of particle size analysis that uses a uniform rotary motion and tapping on top of a sieve stack to determine what percentage of powders fall within a specific mesh/micron size range. While there are other methods available, this blog will focus on the 3 most common: 1) RoTap system with sieves 2) Jet Sieve 3) Laser Diffraction RoTap System with Sieves Understanding and controlling Particle Size Distribution in materials are critical to: PSD or Particle Size Distribution, has been used extensively in countless applications in various industries to monitor, control, and investigate material properties. There are three most common forms of particle size analysis used on powdered materials. Identifying the particle size is an integral part of determining if the milling or sieving process being performed is yielding good results. Many times, there isn’t one correct answer and a combination of tools are required to determine the accurate result. ![]() Silicon Anode Powder for Batteries IndustryÄetermining which particle size analysis methods provides the most accurate representation of your product can often be a difficult process. ![]()
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