International Sugar Journal

A refiner’s experience of on-line colour measurement † [Full subscriber]

The colour of washed white sugar is a key indicator of sugar quality. To ensure its quality, sugar is very often over-washed in the centrifugals, with a resultant increase in refining costs. In 1999, a Neltec ColourQ automatic colorimeter was installed to provide on-line colour measurements of wet sugar after the centrifugals. Until 2007, this system was used for indication purposes only, with the operators manually changing the water spraying time. A reduction in colour variability, and an average colour closer to the desired value was achieved. In 2007, an automatic water spraying system was installed; there was a further…

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