Merchandise is stocked in the rear of the carton flow rack and moves toward the picking station in front on an inclined shelf equipped with specially designed roller track.
A limitation worth mentioning is that carton flows are not well suited for larger volume or full case applications.
In a static storage system such as standard shelving, stockers and pickers often do a lot of unnecessary travel.
Lansing Peter Shield, President of Grand Union Co., applied for patents for the original gravity-feed rear-load design using Unistrut and Nylon strips in 1945 (later approved in 1948).
Grand Union formed a company called Food-O-Mat to sell the carton flow system, and made Gardner Hinckley the president.