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Recertification according to Council Regulation (EC) No 834/2007 and Council Regulation (EC) No 889/2008 (BIO certificate)

Establishment of further storage facility (540 m²)

Implementation of an operating data logging and measurement data acquisition

Certification of an energy efficiency system

Restructuring the hall exterior and roof of the warehouse

Online launch of our new company website after extensive redesign

Renewal of the fire alarm system

Implementation of a new ERP system

Successful Bio Certification

Conversion of the plant control system


Particle size analyses

There is a variety of methods and devices for determining the particle size of a substance. Each unit covers only part of the problem in terms of material usability, measurement and analysis range, accuracy, reproducibility, handling, etc.
Frequent questions to determine the most appropriate measurement method and apparatus are:
  • Which fineness range is relevant?
  • What role does the analysis time play?
  • Which substance must be analysed?

Methods for particle size analysis

a. Laser diffraction

During a laser diffraction analysis, which is the standard analysis for in-process control, the diffraction spectrum of a laser beam is measured at a particle collective. The equivalent diameter of spherical particles which produce the same diffraction pattern can be calculated from the intensity distribution.

  • Very fast measurement
  • Wide measuring range from 0.1 to 875 µm

  • The sample material should not be transparent.

Sympatec HELOS BF

b. Sieve analysis

By sieving the residue the mass distribution can be determined.
The sieve analyses are performed with certified stainless steel screens. There is a variety of mesh sizes available. Depending on the product characteristics vibration screens or air jet sieves are used.

Image: © BMK Wikimedia

Sieves with different mesh sizes

Sieving processes can be carried out by means of different techniques, most of which differ in the movement which is transferred to the material to be screened. A distinction is made between Horizontal sieving and tapping sieving. In a horizontal sieve shaker the sieve stack moves in horizontal circles in a plane. During a tapping sieving a horizontal circular motion overlies a vertical motion which is created by a tapping impulse.

  • The particle size is determined by the sieve mesh size and not calculated indirectly
  • Excellent reproducibility with careful implementation
  • Analysis of large sample volumes is possible

  • Dry sieving analysis only possible > 25 µm

ALPINE Air Jet Sieve
 W.S. TYLER® Ro-Tap® RX-29 Sieve Shaker

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Phone: +49 (0)3644 5058-0
Fax:     +49 (0)3644 5058-99