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Bottlenecks

Written by Nathanial Marshall, Practitioner at LI Europe.

As I was reading Erica’s latest blog on Cycle Time Reduction, it got me thinking about bottlenecks and the importance of correctly identifying them in your production process.

Why is this important?

I have worked with many organisations that have been disillusioned by previous improvement initiatives. There are a variety of reasons for this but one of the most common is a lack of results despite investing time, effort and money to improve a specific asset in order to increase its throughput.  It takes me to an example I saw within a business recently…

A lot of focus had gone into improving casepacker reliability and whilst successful in improving its availability, the work yielded no overall improvement to the line’s output.

The casepacker had the lowest maximum output of all processes on the line. It was the capacity bottleneck.   Having a process of this nature at the end of the line is not a good example of a balanced line and investing in this is certainly something that should be done. However, should it have been the priority focus?

Not when, on closer inspection, the casepacker was being starved by upstream processes. Namely, bagging machines which incurred a large amount of short stops. These 5 to 10 second stops happened so many times that they were going unnoticed by both operators and managers and were seen as the norm. Yet the baggers were the process with the lowest average output – the throughput bottleneck – causing starvation at the case packer and the lack of output. No attempt to improve the reliability and cycle time of the casepacker would improve line output if it wasn’t being fed with product consistently.

Focusing on the baggers to eliminate the most frequent short stops and ensure the casepacker was consistently fed with product and the line’s output improved by 10%.

A simple observational study of a line to capture process speeds, accumulation points and downtime can point you towards the throughput bottleneck.

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