CSC Scientific Blog

A blog about test equipment

The Curse of Particle Size Calculations

Posted by Art Gatenby on Dec 11, 2013 5:56:00 PM

 

Break the Curse of Particle Size Calculations

Every now and then I’ve had to calculate the results of a sieve test: I’d get the sieves and sample loaded on the shaker,  run the shaker, then realize I’d have to start over because I forgot to get the empty weight of each sieve. Or I’d have to carefully brush out the sample onto a balance.

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Topics: Sieve Testing, Sieving Process, Sieve Analysis

Jim, the Secret Agent, and the Machine That Changed Everything

Posted by Amanda Ranowsky on Oct 29, 2013 12:03:00 PM

Chapter One:

 

Jim’s life was dull. So, so dull. He spent his days surrounded by piles of sieves – his glamorous job was to calculate the ratio of particles left in the sieves of each stack after a sample of his company’s product was run through the stack using a sieve shaker. It was a job much like the one his cousin Hiram had, although he seemed to remember hearing that Hiram had found an easier way to do it.  

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Topics: Particle Size Analysis, Sieve Testing, Sieve Analysis

What is The Function of a Sieve Shaker?

Posted by Art Gatenby on Oct 17, 2013 4:56:00 PM

 

Visitors to our web pages often arrive with the question, “What is the Function of a Sieve Shaker?

The simple answer is “to expose the particles in a sample to all the openings in each sieve in a stack”. A sieve stack is the result of fitting each sieve to be used in a given particle size analysis into the one above. The sieve with the largest mesh holes is at the top with each subsequent sieve of a tighter mesh size than the one above it.

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Topics: Sieve Shakers, "Ask Art", Sonic Sifter, Agglomeration, Particle Size Analysis, Sieve Testing, Sieves, Sieving Process, Sieve Analysis, Quiet sieve shakers, sieve shaker

Advances In Sieves: Sieves Able to Strip Molecules From Fluids

Posted by Art Gatenby on Nov 19, 2012 2:32:00 PM

Sieves make understanding the world around us not just possible, but also easier.

And with the advancement of sieves, not only are we able to separate dry particle, but also sift molecules from fluid as well. With molecular sieves developed by MIT, we can now strip a molecule’s individual parts gives us a better understanding of how things come together and work, such as diseases or even DNA. 

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Topics: Sieve Calibration, Sieve Certification, Sieve Testing, Sieves, Sieving Process

Sieves – Old and New QC Issues

Posted by Art Gatenby on Jul 6, 2011 3:13:00 PM

In April, we published an article in "Powder-Bulk Solids" comparing certification process veracity with a sieve calibration process using calibrated glass microspheres (or beads). The certification process merely indicates that a sieve mesh conforms to a standard that has a wide tolerance regarding mesh openings. It is performed on a small number of openings. On the other hand, calibration using the calibrated beads results in a number representing the mean opening -- a result generated by actually performing a test encompassing at least 80% of the mesh openings.

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Topics: Sieve Shakers, Calibration, Particle Size Analysis, Sieve Calibration, Sieve Certification, Sieve Testing, Sieves, Sieving Process

Who's Concerned About Sieve Shakers?

Posted by Art Gatenby on Mar 11, 2011 12:33:00 PM


The primary purpose of a sieve shaker is to provide motion to a sample in a test sieve.

An effective sieve shaker creates a motion that presents all the particles to all of the sieve openings and assists particles in passing through. This requires both rotary and vertical motion.

This process seems simple enough, but let's not be taken in.

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Topics: Sieve Shakers, Particle Size Analysis, Sieve Testing, Sieves

Certify Sieves or Calibrate Sieves --- Should You Do It?

Posted by Art Gatenby on Jun 30, 2010 4:57:00 PM

The relative value of a sieve certification process vs a sieve calibration has perplexed me for a long time.

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Topics: Sieve Shakers, Mid-Point Sieves, Particle Size Analysis, Sieve Calibration, Sieve Testing, Sieves

Static Electricity and Sieves: No Problem -- Maybe

Posted by Art Gatenby on Apr 21, 2010 2:02:00 PM

I'll bet that most of you have experienced the shock of walking on a thick wool rug on a dry winter's day and getting zapped out of your reverie when reaching for the metal door knob.


The same process of static electricity generation can play havoc with your sieving process.

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Topics: Sieve Blinding, Agglomeration, Sieve Testing, Sieves

Re-Certify Mid-Point Sieves? When and How?

Posted by Art Gatenby on Jan 29, 2010 12:24:00 PM

I recently had a long conversation with the person [we'll call him Bill] responsible for setting up the quality procedures for very tight specifications in a new process -- part of which was developing procedures for checking the ongoing tolerances of production sieves.
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Topics: Mid-Point Sieves, Sieve Calibration, Sieve Testing, Sieves

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