Five steps recommended to set up sieve shaker operating time
The operating time of a sieve shaker is very important for sieve analysis result.
This is because the sieve stack has a range of different aperture sizes, and some are smaller than the nominal and some are larger. The longer the running time for the shaker, the greater chance for larger-than-nominal particles coming through the sieve that are not supposed to. If the stack of sieves has a wide range of aperture sizes, there is likely to be a compounded error.
There are industry standards for sieving operating times for different materials to refer to. However, to determine the correct operating time for a new material, or to confirm the accuracy of existing specifications, the following five steps can help to set up a more accurate operating time.
Step 1. Weigh up the sample needed to be tested and prepare a stack of Glenammer test sieves and a Glenammer sieve shaker. (Click to Read more about sieving analysis instruction)
Step 2. Run the sieve shaker for 5 minutes first, and weigh the residue in the pan. Record in column 3 (weight), and calculate the percentage increase in relation to the starting weight in column 4.
Step 3. Run the sieve shaker for one additional minute, weigh the residue and record the number and increased percentage compared with the 1st test.
Step 4. Repeat Step 3 a few times, and keep recording the data.
Step 5. When the percentage increase drops below to 1%, the total operation time should be recorded and the test completed.
When the change in percentage of sample passing through in the 1 minute period drops to below 1%, the total operating time can be considered a relatively accurate shaking time for subsequent analysis.
Advantech Mfg. (2001) Test Sieving: Principles and Procedures. Available at: http://www.espanol-advantechmfg.com/pdf/principles_procedures_manual_with_tables-2.pdf (Accessed: 23 February 2017).