Pgbarranca's Blog

May 26, 2010

Pallets

Filed under: Uncategorized — by pgbarranca @ 9:42 pm

In my job (architect), I very often see pallets in building works, this is something I´m curious about. That´s why I looked for some information about it.

Pallets

A pallet is a flat transport structure that supports goods in a stable fashion while being lifted by a forklift, pallet jack, front loader or other jacking device. A pallet is the structural foundation of a unit load which allows handling and storage efficiencies. Goods or shipping containers are often placed on a pallet secured with strapping, stretch wrap or shrink wrap and shipped.

While most pallets are wooden, pallets also are made of plastic, metal, and paper.

Overview

Containerization for transport has spurred the use of pallets because the shipping containers have the clean, level surfaces needed for easy pallet movement. Most pallets can easily carry a load of 1,000 kg (about 2,000 lb). Today, over half a billion pallets are made each year and about two billion pallets are in use across the United States alone.

Skids and pallets were slowly introduced throughout the early 20th Century.

Pallet development

The pallet was developed in stages. Spacers were used between loads to allow fork entry, progressing to the placement of boards atop stringers to make skids. Eventually boards were fastened to the bottom to create the pallet. The addition of bottom boards on the skid, which appeared by 1925, resulted in the modern form of the pallet. With the bottom deck, several problems common to the single faced skid were addressed.

Effect on rail transport

Pallets and forklifts also provided much quicker turnaround of rail cars and ships. In 1931, it took three days to unload a boxcar containing 13,000 cases of unpalletized canned goods. When the same amount of goods was loaded into the railway trucks on pallets or skids, the task took only four hours.

Standardization and regulation

Dimensions

In a pallet measurement the first number is the stringer length and the second is the deckboard length. Square or nearly-square pallets help a load resist tipping.

– Two-way pallets are designed to be lifted by the deckboards.

– Four-way pallets, or pallets for heavy loads, or general-purpose systems that might have heavy loads are best lifted by their more rigid stringers.

Pallet users want pallets to easily pass through buildings, stack and fit in racks, forklifts, pallet jacks and automated warehouses. To avoid shipping air, pallets should also pack tightly inside intermodal containers and vans.

No universally accepted standards for pallet dimensions exist. Companies and organizations utilize hundreds of different pallet sizes around the globe. While no single dimensional standard governs pallet production, a few different sizes are widely used. There are:

– ISO pallets

– North American pallets

– European pallets

– Australian Standard pallets

Types of pallets

Stringer pallet

Stringer pallets use a frame of three parallel pieces of timber (called stringers). The top deckboards are then affixed to the stringers to create the pallet structure. Stringer pallets are also known as “two-way” pallets, since a pallet-jack may only lift it from two directions instead of four. Forklifts can lift a stringer pallet from all four directions, though lifting by the stringers is more secure.

Block pallet

Block pallets (also referred to as Manoj pallets) are typically stronger than stringer pallets. Block pallets utilize both parallel and perpendicular stringers to better facilitate efficient handling. A block pallet is also known as a “four-way” pallet, since a pallet-jack may be used from any side to move it.

Perimeter base pallet

All stringer and some block pallets have “unidirectional bases,” i.e. bottom boards oriented in one direction. While automated handling equipment can be designed for this, often it can operate faster and more effectively if the bottom edges of a pallet have bottom boards oriented in both directions. For example, it may not need to turn a pallet to rack it, and operation is less sensitive to pallet orientation.

Pallets can be made of many materials

Pallet Sources

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2 Comments »

  1. You’r unquestionably right with this blog!

    Comment by юзербары для форумов — December 4, 2011 @ 5:26 pm |Reply

  2. Wooden Pallets and Plastic Pallets in Melbourne are ideal in Australia.

    Comment by Mudassar Ahmad — January 2, 2014 @ 3:19 pm |Reply


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