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Original Article

Efficiency in in-plant milk-run systems—The influence of routing strategies on system utilization and process stability

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Pages 137-143 | Received 01 May 2014, Accepted 17 Mar 2015, Published online: 19 Dec 2017
 

Abstract

In-plant milk-run systems represent transportation systems, where materials are delivered from a central storage area to several points of use on fixed routes and in short and defined intervals. Milk-run systems generally enable frequent deliveries in low lot sizes with short lead times and low inventories at the points of use. Thus, stable and reliable system operation is crucial to avoid delays and material shortages. In industrial practice, milk-run trains usually share resources, for example, loading areas and technology and use the same tracks, leading to dependencies between routes and possible traffic jams and blockages, which significantly affect cycle times and may lead to instabilities in the system. We present a simulation model to analyse in-plant milk-run systems with a focus on typical traffic situations. We describe its application to a large industrial case study in detail and derive recommendations for designing routes with low risk of delays.

Acknowledgements

Note—This paper is a revised and expanded version of a paper entitled Effizienzsteigerung für Routenzüge – Untersuchung des Einflusses der Routenführung auf die Auslastung und Prozessstabilität presented at 15th ASIM Dedicated Conference Simulation in Production and Logistics, Paderborn, Germany, 9–11 October 2013.

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