I feel a very long explaination coming on.
So for those who dont know, here is how the process works for us at a general RDC. This could explain a lot of the reasons we do the things we do.
This is how MOST pallets come to us, delivered by the vendors. (Picture included somewhere).
Most freight comes to us on very mixed up pallets by the vendor. Our inbound department unloads these pallets off the vendor trailer, and breaks down these pallets into individual cartons.
Depending on how logistics schedules the cartons, some freight is labeled and put on a series of conveyors to be taken to our trailers being loaded to be sent to a store. The rest is labeled, or repalletized if the amount is significant enough, and set to be stored in specific locations throughout the warehouse.
As for the stored away freight, every day at 4am, a computer generated set of labels is printed out for the warehousing department. These labels are generated based on store sales, and each label is for a specific item for a specific store. Warehousings' job is to take these labels, find the freight specified on the label, label each carton, and put it on the conveyors to be sent to the trailer being loaded for that store.
So heres 1 problem. Most trailers are loaded for 3 consecutive days before they are full, or needed to be cut and sent anyway. Say the computer generates 3 labels of a specific carton of diapers. Three cartons are labeled and loaded. Say the next day the computer generates 5 more. They are labeled and loaded, but since 24hrs has passed they are certainly loaded further back on the trailer. 3rd day same thing, and so on.
There is a lot more to it, but that is a nutshell.