Feed Ops: Stack it, store it, ship it

by Fred Fairchild
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pallet storage
 
This is the second article in a two-part series on packing, storing and shipping finished product. In part one, found in the February issue of World Grain, bagging and sealing systems for bagged product in 50- to 110-pound bags were discussed. Whether plain or printed bags are used, it is still necessary to put information on the bag to identify the lot and date the product was manufactured. A separate printed tag may be attached in the sealing area as the bag is sewn or glued shut.

The other way to identify the lot the bag is from is to stamp the information onto the bag using a labeler. These labelers may be automatic and included in the automated bagging and sealing system. Either way, it is important to identify what lot of product is in the bag. This information also may be used for inventory control and product location in the warehouse.

The bag used needs to be fully filled and shaped when sealed. This is extremely important if the bags are to be palletized and or stacked. As the bags are discharged from the packing line, they must be handled either manually or by a mechanized system such as a robotic arm.

In earlier times, the removal of bags from a packing line and stacking or putting them on pallets was done manually or by installing an expensive and complicated bag conveying belt. It fed the bags into a palletizer that was totally automatic or required a person to turn the bags so they could be positioned to form a tier of bags to fit the pallet. Today’s use of automated high speed bagging equipment may be followed by a robotic bag handling system that may place empty pallets in a specific spot and orientation so that each bag may be picked up and placed on the pallet in a pattern. It eliminates human handling. The robotic bag handler may be programmed to do the work needed and is much more accurate than a person trying to do the same thing.

A common size pallet measures 42 inches wide by 48 inches long. Figure 1 shows a pallet with a five-bag tier pattern on each level. The tiers are alternated by turning every second tier 180 degrees so the bags from each tier interlock with the other tiers.

A ton of 50-pound bags will need 40 bags. Using a five-bag pattern for each tier on a pallet, eight tiers would be needed for the pallet to hold a ton. The bags on a full pallet also may be automatically wrapped in shrink wrap to hold the bags in place when handling a full pallet.

A 42-inches-wide pallet is used so that a double row of pallets may be placed in a box truck or semi-trailer, which are limited to a maximum of eight feet wide on the outside. Some new trailers and changes in state motor vehicle regulations now allow outside widths of 8 feet, 6 inches. The walls of the trailers are two to three inches thick so the net width inside is 90 inches or less. The semi-trailer will hold 24 pallets in a 2 x 12 layout. A second layer of 24 pallets might be added if height limits and allowable load capacity of the trailer are not exceeded.

Once the product is loaded on a pallet, a forklift truck is used to move the pallet to its location. Locating the pallets sensibly may make a huge difference in the number of forklift trucks required to place and retrieve the pallet and the product on it. I personally know a feed company that sold most of their products in 50-pound bags. Pallets of product were placed in any location in the warehouse there was space. This required the forklift trucks to travel many miles to place and retrieve product from wherever it was put in the warehouse to fill a shipment. This company served large customers with single product shipments as well as small feed stores and outlets resulting in mixed bags of product on the same pallet. The company analyzed their shipments and redesigned their warehouse so truck loads were staged near the truck loading area. The large usage product pallets also were located as close to the loading area as possible. The less or seldom-used product pallets were put farther back in the warehouse. By making these changes, the company reduced the number of forklifts required from five to two and cut the forklift mileage in half. This resulted in a major cost savings in handling product.

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