Introduced in the early 80’s, the sliding shoe sorter gained wide spread acceptance in manufacturing and distribution systems due to its ability to positively sort a large range of case sizes and configuration, including small and light weight cases. Offered by all major material handling system providers, the sliding shoe sorter has become the preferred sorting method for a broad range of both manufacturing and logistics applications.

From its launch and up until the last few years, sliding shoe sorters were limited by design constraints to a maximum speed of about 350 FPM and a minimum gap (space between cases) of about 12 inches. Based on these limitations the typical shoe sorter had a maximum sorting rate in the 100 to 120 CPM range. Many of these systems are still in operation today.

With advances in sortation technology, manufacturers have moved beyond the original sorter design constraints. As a result, today’s sliding shoe sorters are capable of running at twice the speed with 50% less gap between cases. With gap optimizing software controlling high capacity multi-line merges, servo-based induction and sortation, system throughput rates in excess of 300 CPM are possible.

Capitalize on New Software and Control Upgrades

Older sliding shoe sorting systems (constrained by the 350 FPM maximum speed) can also benefit from the new gap optimizing software. Based on manufacturers’ reports, a relatively simple PC-based upgrade can maximize case population at induction and on the sorter, increasing throughput up to 20% without increasing the speed of the sorter.

This additional capacity may be just enough to absorb peak demand on a daily or seasonal basis while extending it’s usefulness for a few more years at an acceptable ROI. And, while you’re at it, you may want to check out the sorting management and performance controls that are now available. Visual displays that can provide insight into how your sorting system is performing allowing you to better manage picking waves and peak volume periods throughout the picking and shipping cycle. New diagnostic controls can provide maintenance and status reports that can reduce system downtime.

Final Thoughts

With proper and regular maintenance, sliding shoe sorters will last a very long time. After many years of service in one location, they can be refurbished, expanded and relocated to a new location. Keeping the sorter software and controls up to date will ensure that you are getting the optimum performance out of your investment further extending its useful service life while in your operation.

Agree or disagree with Holste's perspective? What would you add? Let us know your thoughts for publication in the SCDigest newsletter Feedback section, and on the website. Upon request, comments will be posted with the respondent's name or company withheld.

You can also contact Holste directly to discuss your material handling or distribution challenges at the Feedback button below.