Improved image analysis system for technical sugar crystal suspensions*

Since 2003, Suiker Unie has used an off-line image analysis system (IAS) to measure the size distribution of crystals in industrial massecuites. This paper describes the technical set-up, the methods of sampling and sample preparation, and of particle sizing and classification. Based on the experiences of Suiker Unie a couple of improvements were developed that have been realized when updating the system in 2015/16.

Analyzing final Aproduct (Asugar) with a crystal size of approximately 600µm was not possible with the original system. When updating the system the opportunity was taken to extend the measuring range to include Asugar. The original light-microscope and automated XYstage were extended with new components: an XYstage controller, a high resolution camera and customized image analysis software, providing new methods of image acquisition and processing. The new hardware and software configuration now allows measurements in the crystal size range of 10µm to 2000µm. The sample preparation procedure was modified to avoid false grain formation especially in suspensions of low purity. Samples are now directly dispersed in a sucrose-fructose solution. The updated system and procedure show less variance in mean aperture (MA) and coefficient of variation (CV) compared to the formerly used method. Both seed crystals and the final Asugar can now be analyzed, thus covering the complete sugar crystallization process.

Download PDF
Language: English

Copyright © Verlag Dr. Albert Bartens KG

Rights and permissions