An alternative approach to setting a mill

Kent, Geoffrey Alan (2014) An alternative approach to setting a mill. In Peacock, Steve & Ramgareeb, Sumita (Eds.) Proceedings of the 87th Annual Congress of the South African Sugar Technologists' Association, South African Sugar Technologists' Association, Pietermaritzburg, South Africa, pp. 172-181.

View at publisher (open access)


The conventional approach to setting a milling unit is essentially based on the desire to achieve a particular bagasse moisture content or fibre fill in each nip of the mill. This approach relies on the selection of the speed at which the mill will operate for the selected fibre rate. There is rarely any checking that the selected speed or the selected fibre fill is achieved and the same set of assumptions is generally carried over to use again in the next year.

The conventional approach largely ignores the fact that the selection of mill settings actually determines the speed at which the mill will operate. Making an adjustment with the intent of changing the performance of the mill often also changes the speed of the mill as an unintended consequence.

This paper presents an alternative approach to mill setting. The approach discussed makes use of mill feeding theory to define the relationship between fibre rate, mill speed and mill settings and uses that theory to provide an alternative means of determining the settings in some nips of the mill. Mill feeding theory shows that, as the feed work opening reduces, roll speed increases. The theory also shows that there is an optimal underfeed opening and Donnelly chute exit opening that will minimise roll speed and that the current South African guidelines appear to be well away from those optimal values.

Impact and interest:

Citation counts are sourced monthly from Scopus and Web of Science® citation databases.

These databases contain citations from different subsets of available publications and different time periods and thus the citation count from each is usually different. Some works are not in either database and no count is displayed. Scopus includes citations from articles published in 1996 onwards, and Web of Science® generally from 1980 onwards.

Citations counts from the Google Scholar™ indexing service can be viewed at the linked Google Scholar™ search.

Full-text downloads:

369 since deposited on 21 Oct 2014
226 in the past twelve months

Full-text downloads displays the total number of times this work’s files (e.g., a PDF) have been downloaded from QUT ePrints as well as the number of downloads in the previous 365 days. The count includes downloads for all files if a work has more than one.

ID Code: 77918
Item Type: Conference Paper
Refereed: Yes
Additional URLs:
Keywords: Sugar mill, Sugar mill setting, Speed, Rate, Compaction, Feeding
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > FOOD SCIENCES (090800) > Food Processing (090805)
Divisions: Current > Research Centres > Centre for Tropical Crops and Biocommodities
Copyright Owner: Copyright 2014 South African Sugar Technologists' Association
Copyright Statement: No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical photocopying, recording or otherwise without the written permission of the copyright owner.
Deposited On: 21 Oct 2014 22:22
Last Modified: 26 Oct 2015 09:48

Export: EndNote | Dublin Core | BibTeX

Repository Staff Only: item control page