Staying on Track
With more than an estimated 100 million reusable
containers moving around North America, keeping tabs on these assets has become
a major task and a major business.
by Clyde E. Witt, editor
Movin’, movin’, movin’ is more than a mantra in the world of logistics. And
while speed is at the heart of virtually all supply chain programs, keeping
track of what goes where is critical to success. Automatic data collection
provides total asset visibility through inventory and container tracking.
Bar coding has been, and continues to be, the method of
choice for inventory tracking. Radio frequency, however, is gaining popularity
as the cost of radio frequency identification (RFID) tags continues to drop.
Attaching RFID tags, or using a global positioning system (GPS), gives
logistics managers full knowledge of what is in a container and where in the
world that container might be.
The Intellitag Reusable Plastic Container tag from Intermec
Technologies is specifically designed to be mounted on a returnable container.
It allows companies to track the location and contents of bulk packaging
throughout the supply chain. The tag operates at 915 MHz (UHF) frequency band,
with a single-antenna range of up to four meters.
“In distribution center environments,” says
Winston Guillory, vice president of Intermec’s Intellitag business group,
“our signal range translates to accurate scanning anywhere within a
standard industrial doorway or portal.”
Intellitag’s system uses tiny computer chips and
miniature antennas (smaller and lighter than a postage stamp), along with
readers known as interrogators. The technology allows companies to track goods,
containers and vehicles in real time. Intellitag RFID can read and update
information on many tags at once, rather than one at a time, using low-power
wireless signals that don’t need line of sight like laser scanners.
Intellitag tags read as much as 40 times faster than conventional bar codes.
A different approach
“Bar code technology and radio frequency identification,
if used in combination, can optimize efficiency at the lowest possible
cost,” says Jerry Backus, vice president, supply chain technology, Hoover
Materials Handling Group.
According to Backus, only about half the companies in a
recent survey put bar coding into their business plans and about 17 percent
were using RFID for tracking. The speed and accuracy of scanning bar codes or,
in high-volume operations, RFID tags, can improve productivity many times over.
A new technology from Hoover, Internet Tracking Resource and
Asset Management (iTRAM), enables companies to track returnable packaging
throughout manufacturing, storage, distribution and recovery. The Web-based
program uses the Internet, through which users can access Hoover’s
software and communications systems.
One application of the system is to track reusable
containers for automotive parts as they move through distribution. Hoover is
working with Genei Industries, a third-party service provider in the automotive
industry, to track the production and movement of steering columns and improve
Genei’s service.
The difference in this program from others is that iTRAM
will track the container, not just the parts as is done with other programs. By
tracking both parts and containers as a unit, Genei’s customers will have
vital information throughout the shipping life of the product. With time, those
customers can build a history of how long it takes to move products along the
supply chain.
Tracking products and containers in warehouses often
involves scanning bar codes or RFID tags over long distances. The
ultra-high-frequency Tag-it UHF Transponder and Reader system from Texas
Instruments overcomes this distance challenge. Incoming and outgoing cartons,
pallets and returnable containers equipped with Tag-it responders can be
automatically identified from stationary antennas that cover typical
10-foot-wide warehouse loading docks. In addition to the increased read range,
the system enables simultaneous identification of multiple tags in the field,
and, unlike bar codes, typically does not require line of sight to be read. The
Tag-it reader can accurately and reliably differentiate 50 or more cartons on a
pallet passing through the system at the same time.
The one-time programmable Tag-it transponder contains 1,024
bits of memory including a 48-bit serial number. Users can add information to
available memory blocks as the transponder travels through the supply
chain. ADF
