International Sugar Journal
The Blackboard

Polarisation [Registered]

Polarimetry has been used in the sugar industry for a long time; Browne & Zerban mention that the Biot and Ventze polariscopes were used with sugar solutions in 1840 and 1842 respectively. The concept and its application in sugar analyses are described in chemistry textbooks (Willard et al. 1974).

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The Blackboard

Mathematical statistics [Registered]

Do many sugar technologists consider applied statistics a useful topic and therefore worth attention? If the answer is no, as I believe it would be, then this is sad. A working knowledge of applied statistics is very useful, even essential, in any process involving chemistry, engineering, agriculture and finance, which are all relevant in the sugarcane industry.

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The Blackboard

Assessing post-harvest cane deterioration [Registered]

As was the case for other topics in previous Blackboards, post-harvest cane deterioration was already studied more than 120 years ago. Hes (1950) quotes results obtained in many countries over the period 1894 to 1946. He states that burning increased deterioration, caused weight loss, and that wet cane “soured rapidly, causing a good deal of trouble on the pan floor.”

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The Blackboard

Post-harvest cane deterioration [Full subscriber]

In 1959 Vallance & Young, commenting on the introduction of chopper harvesters, noted that billets (BI) would deteriorate faster than whole stalk (WS) cane between harvesting and milling because of the increased number of cut ends; these would intensify sugar losses due to fermentation and to increased respiration

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The Blackboard

Extraneous matter (EM) and processing [Registered]

The impact of EM on processing has been investigated extensively. In 1949 (Anon.1) the disadvantages to factory work caused by excessive quantities of EM in cane were discussed at length. Trash decreased sucrose (S) in total cane, increased the fibre content, and decreased the Java Ratio which affected cane payment.

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The Blackboard

Extraneous matter (EM) in cane [Full subscriber]

EM in sugarcane can be of vegetable or mineral nature. The former includes immature tops, green/dry leaves, sheaths, side shoots and suckers; the minerals consist mainly of soil/sand present in the harvested cane. In the past all the EM in sugarcane was viewed as a problem with negative effects during harvesting, loading and transporting of the cane and on processing through reduced throughputs, poor boiler operation, sucrose losses and poor sugar quality.

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The Blackboard

Acid beverage floc (ABF) [Registered]

ABF, a flocculated turbid material that sometimes appears on standing in carbonated, acidified and sweetened beverages, causes severe commercial problems both in soft drinks and in acidic pharmaceutical syrups, although […]

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The Blackboard

The sucrose crystal: Effect on processing [Full subscriber]

Investigating the form and shape of sucrose (S) crystals started in 1843; remarkable results were published by Kucharenko and Phelps in 1928 and 1932 (Powers, 1969-1970). In 1959 Powers mentioned […]

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The Blackboard

The sucrose crystal: Fundamentals [Registered]

One of the main objectives of the sugar industry is to produce large quantities of crystalline sugar of high purity, at a commercially acceptable price. This is possible because sucrose […]

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The Blackboard

Filtration of clarifier muds in raw sugar factories [Registered]

The clarification process in cane sugar factories yields clear juice which moves forwards to the process and an underflow called mud. The mud contains non-sucrose species precipitated through the action of heat and lime; as it settles slowly the precipitate traps, and therefore removes, suspended matter in the supernatant juice.

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