Sieving Riffler™ and Rotary Micro Riffler™

The Sieving Riffler and Rotary Micro Riffler are designed to accurately and reproducibly prepare representative powder samples from larger laboratory or bulk quantities.

The Sieving RifflerThe Sieving Riffler is designed to handle larger quantities of powder than the Rotary Micro Riffler.By attaching a sieve to the top of the hopper, samples can be obtained which are representative of the initial sample while excluding all particles larger than the selected sieve size.

The Sieving Riffler has three basic components: A cylindrical vibrating hopper which is amplitude-variable and controls the delivery rate of the powder. A rotating sample collector which is divided into eight stainless steel compartments. And a replaceable sieve used to exclude particles above a selected size.

To accommodate a variety of materials the Sieving Riffler has two sets of controls. The powder delivery rate is controlled by the hopper's vibrational amplitude and by an adjustable gate at the hopper vent. The rotational rate of the collectors can be varied continuously or in three steps for exact reproducibility.

To divide a sample, the hopper (2500 cm3 capacity) is filled or partly filled with sample. The vibrator amplitude is set and the powder is automatically fed into eight stainless steel collectors. After all the material has been delivered into the collectors, further reduction in sample size may be achieved by emptying the contents of one or more of the collectors back into the hopper for additional reduction. By placing a sieve on top of the hopper, the Sieving Riffler will automatically exclude particles larger than the sieve size from the riffling process.

Sieving RifflerSpecifications

By repetitive division of the collected smaller representative samples, the desired final sample size may be obtained.

The Rotary Micro Riffler has two basic components: A circular vibrating bowl which is amplitude-variable and controls the delivery rate of the initial sample powder. A sample collector which is a rotating disc holding eight test tubes. Size of the test tubes may be varied to accommodate the initial sample size.

To accommodate a variety of materials the Rotary Micro Riffler has two sets of controls; one for the delivery rate and the second for the rotation rate of the collectors. By varying these two controls, accurate divisions of any powder may be achieved regardless of particle size or density.

To divide a sample, up to 120 cm3 of sample is loaded into the Rotary Micro Riffler's vibrator bowl. If more than 120 cm3 must be divided, then additional fillings after each complete delivery may be made until the total initial sample has been divided. The vibrator bowl will automatically feed the collector to provide eight representative powder samples in the test tubes rotating in front of the vibrator. After all the material has been delivered into the test tubes, further reduction in sample size may be accomplished by emptying the contents of one or more of the test tubes into the vibrator and repeating the procedure until the desired sample size is achieved.

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