Definition - What does Throw-Action Sieving mean?
Throw-action sieving is a vibratory sieving method consisting of vertical movements. During this procedure, the material in the sieve is thrown into the air via a vertical vibration of the sieve. A slight circular motion is also induced to ensure that the particles are evenly distributed over the sieving surface. The particles then interact with the sieve as they fall back, passing through the sieve if they are smaller than the openings.
Throw-action sieving may also be known as a gradation test.
Corrosionpedia explains Throw-Action Sieving
Sieve analyses, also known as gradation tests, are used to assess the particle sizes of granular materials (such as gravel) by allowing the material to pass through a series of sieves of progressively smaller mesh sizes. Two of the most common types of sieve analyses are horizontal and throw-action sieving.
One of the defining characteristics of throw-action sieving is its vertical motion, which tosses the sample into the air. While in the air, the particles rotate, presenting a different orientation to the mesh when they fall back. This ensures that all sides of the particle meet the required size criteria.