Baking & Snack - July 2020 - 70

Left: Modern inspection
systems assess products
before choosing the
correct voltage and amperage so the operators
don't have to.
Right: Simultaneous
frequency technology
carries out a real-time
analysis of low- and
high-frequency signals.
Fortress Technology

signal tends to reduce the sensitivity of the detector in a
way that cannot easily be calculated, and in most cases, if
an indication of sensitivity is required, then a product test
will be necessary to get an accurate indication."
For those dry products, Mr. Sanchez noted, sensitivity charts will calculate the expected operating
performance.
With X-ray, density and product thickness also come
into play, said Todd Grube, product manager, inspection
systems, Heat and Control.
"Typically, the higher the density or taller the product
- or wider the width in a side-shoot X-ray system -
the more X-ray power is required for proper inspection,"
he said. "As product density and/or thickness increases,
the likelihood for reduced performance also increases."

What's the frequency, Kenneth?
For metal detectors, physical size and orientation, especially of conductive products, can impact the inspection,
Mr. Grube pointed out. It can also help determine the
type of technology.
"For metal detection, manufacturers must determine
whether their products require a single-frequency unit,
multi-frequency or multi-spectrum technology exclusive to our CEIA metal detectors."
To properly match the system with the product size
and type, the key is working with a variety of frequencies.
"Often, the solution is to change the frequency of operation to minimize the effect," Mr. Mason said.
But sometimes, choosing one frequency over another
becomes a tradeoff.
"The downside of doing this is that it can impact the
ability to find different metals," he cautioned. "By dropping the frequency, the ability to find ferrous metals is
enhanced but limits performance when it comes to finding non-ferrous metals because the lower end of the frequency is more responsive to magnetic effects of the contamination. By the same token, if the frequency is higher,
the reverse happens; the ferrous detection capabilities are
limited, but non-ferrous detection is enhanced."
Today's metal detectors solve this problem by operating on multiple frequencies at the same time. Mettler

70 Baking & Snack July 2020 / www.bakingbusiness.com

Toledo's MSF metal detectors use a combination of high
and low frequencies simultaneously, using two stages:
frequency and phase.
"This cancels the input from combinations of high
and low frequencies," Mr. Sanchez said. "The result is effective removal of the product signal, allowing for much
smaller contaminants to be detected."
Vision technology can be integrated with metal detection for enhanced inspection. While these systems have
typically focused on either the height difference or color
variations, EyePro System spent several years developing
its Multi-Eye technology to detect defects on the surface
of a product.
"Our systems can inspect the quality of the products and
identify defects often not detectible by other technologies,"
said Erica Vannini, sales and customer service, EyePro
System. It uses a combination of spectroscopy and imaging technology to acquire an image of the product at various wavelengths to detect the foreign body. "Think about a
piece of white plastic on a mozzarella cheese pizza."

Training the equipment
In every installation, operator training is a critical step.
However, when it comes to inspection systems, the machines must be taught what to detect, too.
" 'Teaching' the equipment involves passing known
good product so the unit can learn the signal or image
it creates," Mr. Grube said. "Once the baseline is set, deviations are then identified as a reject. Most metal detectors and X-ray systems today can be taught with only
one or two product passes. However, with product that
is more difficult to inspect or those that can vary from
one to the next, passing more product in the auto-learn
process will generally produce a more accurate setup as
the equipment can include a range of what is acceptable."
When the system is properly trained, simultaneous
multi-frequency technology can also be effective with
inspecting product variations.
"Once a detector has been set up to inspect a particular product, the product signal suppression technology
is applied to each item that passes through the detector,"
Mr. Sanchez said.


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Baking & Snack - July 2020

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Baking & Snack - July 2020 - 1
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