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There’s no sense in throwing out a perfectly good food product. With food waste being a global concern and the cost of production remaining ever-present, throwing out a product that looks good on the surface seems like a waste. But, when your food inspection system tells you that perfect looking package doesn’t actually pass, can you really run the risk of letting it go through regardless?
Therein lies the issue of false rejects in food inspection. In a false reject scenario, a passable product is flagged by an automated system for falsely perceived safety or quality defects. This can happen for a variety of reasons (which we’ll get to later), but the bottom line is that it creates a production-stopping dilemma for food businesses everywhere.
For that reason, we’re taking a closer look and getting to the bottom of how food businesses can mitigate false rejects to more reliably protect their productivity, bottom line, reputation—and most importantly, their customers.
Why Food Processors Must Mitigate False Rejects
When evaluating items on a production line for food safety, a rejected food product on its own is enough cause for concern. When a reject (or multiple rejects) occurs, it raises many questions for the plant operator. Is the reject legitimate? What caused it? If there’s a contaminant, where did it come from? Have any machines been damaged by the contaminant? How many more items are contaminated? The list continues to snowball, forcing operators to painstakingly inspect every possibility.
Before getting too far down the line, answering that first question is critical: is the reject even legitimate? While a valid reject naturally demands immediate attention, a false reject only results in a significant waste of resources—largely in the form of downtime, additional labor, and scrap. With productivity, profits, and safety all at stake, it is in the best interest of both food manufacturers and their customers for the facility to take every precaution to reduce false rejects as much as possible. That way, when a reject does arise, it can be addressed seriously without concern for wasted resources.
Where False Rejects Occur In Food Inspection
To mitigate false rejects, it is important to first understand where they are likely to occur in food inspection tasks. Although details can differ wildly by application, there are a number of universal factors that can contribute to an increase in false rejects.
Busy Images
“Busy” is an umbrella term that we use to describe a variety of imaging conditions. Any time that an inspected item consists of multiple layers, or when there are items of varying shape or densities being inspected simultaneously, the resulting images can be considered “busy”.
Take for example a flow of raw poultry bulk product. There is no one uniform standard to compare each piece against. There will be natural variations between one chicken thigh and another due to the organic nature of the product. These variations can create a “busy” image which can make spotting contaminants more difficult.
A box of cereal may also prove challenging to analyze, as their contents often consist of small bits and pieces of varying densities. With a mixture of ingredients like corn flakes, raisins, almond slivers, and marshmallows all in the same package, the resulting image can make it difficult to determine whether or not there is a legitimate contaminant amongst the intended contents.
Packaging & Material Handling
While the product itself can create a busy image, packaging can contribute to these conditions as well. As another example, consider a bag of individually wrapped candies. As the candies are layered over one another, it becomes difficult to distinguish potential contaminants amongst a concentrated area of product. This is further muddied by additional layers of individual wrappers.
Boxes can also be also a major contributor to false rejects. If a box is dented just the smallest bit on the production line, that unexpected silhouette can trip up the system even if the product inside is in the clear. Something as trivial as box orientation can result in a false reject, too. Isolating the inner contents from its packaging is crucial to preventing false positives in food inspection.
Outdated Inspection Technology
Above all else, outdated food inspection technology leads to more false rejects. Single energy x-ray systems tend to struggle with all of the issues mentioned above—busy images, packaging, and product orientation. In addition to those issues, metal detectors also tend to suffer from increased false rejects when inspecting products thawed from frozen, and products with high salt content. That’s not to mention their inability to detect nonmetal contaminants altogether.
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The Advantage of X-Ray Technology for Food Safety
With all this in mind, the answer to preventing false positives in food inspection lies in today’s latest x-ray technology. Where legacy equipment struggles to discern fine details, dual energy x-ray machines cut through the noise. This ability allows dual energy systems to excel in reliably performing safety checks and quality checks at the same time which can reduce false rejects at all stages.
So, what makes dual energy the leading technology for superior x-ray inspection accuracy? For the purposes of this article, we’ll be focusing on what these machines can accomplish rather than what makes them tick.
To start, dual energy x-ray machines are the most versatile that today’s market has to offer. They can be used to inspect a wide variety of products including frozen goods, raw meat, packaged TV dinners, and bottled condiments. If you can name it, dual energy x-ray equipment can inspect it without a hitch.
Dual energy x-ray technology can also detect foreign objects of all kinds, both organic and inorganic. Unlike metal detectors, x-ray machines can be used to identify metal shavings, glass shards, and fish bones all in one swift scan. Unlike single energy x-ray machines, dual energy systems can easily discern complex product images to quickly pinpoint any unwelcome physical contaminant.
The pinnacle of these capabilities can be seen with PXT™, photon-counting x-ray technology. This technology pioneered by Eagle goes beyond surface level imaging to identify an item’s contents with enhanced dual energy technology. This powerful detector paired with SimulTask™ PRO imaging software drastically reduces the visual clutter associated with “busy” images, making it simple to identify foreign objects in complex profiles like cereal boxes, salad bags, and bulk meats.
Today’s X-Ray Software Capabilities
If machinery is one half of the equation, then software is the other. Even when using the most advanced x-ray inspection machinery available, the acquired data can only be analyzed to its full potential when paired with capable imaging software. Eagle’s SimulTask PRO™ utilizes a combination of pre-installed processing algorithms and user programming to provide unmatched x-ray inspection accuracy. This industry-leading program is built for seamless compatibility with our advanced dual energy x-ray inspection machines. The combo of Eagle systems with SimulTask PRO gives users a dynamic duo for maximizing throughput and accurately preventing false positives in food inspection.
This software boasts unique features that place it leagues above competing programs. When analyzing packaged goods, SimulTask PRO™ allows users to isolate inner containment to exclude cartons, boxes, cans, and other packaging. This eliminates false rejects related to cosmetic packaging defects or package orientation, instead focusing analysis on the product inside. The software also lets users customize reject thresholds to be as wide or narrow as they choose, further cementing the validity of each rejected product.
The Link Between X-Ray Inspection Accuracy and Traceability
When a reject does come about on a system that utilizes dual energy x-ray machines and accompanying imaging software, what’s the best way to determine the origin of the issue? That’s where traceability comes into play. Traceability comes from having machines stationed at critical control points throughout the production line, as well as a centralized database to store key info collected at these points.
By leveraging traceability software like Eagle’s TraceServer™, operators can quickly gain key insights to help them pinpoint the root cause of safety and quality concerns. TraceServer™ stores image data, time stamps, associated machine data, and other crucial information that can be easily accessed at a moment’s notice. A robust tool such as this empowers operators with the data they need to get their systems back up and running faster in response to a reject scenario.
Maintaining Long-Term X-Ray Inspection Accuracy
With outdated inspection technology being a leading cause of false rejects, it’s natural to question the long-term viability of today’s systems. The good news is that these x-ray machines are built for longevity, so businesses who take the step towards advanced inspection today can experience a meaningful return on investment for the foreseeable future. With proper machine maintenance, contemporary dual energy x-ray inspection systems can remain accurate and reliable tools for your production line for years to come.
FAQs of Common Causes for False Rejects
1. What is a false reject in food inspection?
A false reject happens when an inspection system flags a product as unsafe or defective even though it’s actually acceptable. Even though it’s “just” a false alarm, it can still trigger downtime, extra labor to investigate, and unnecessary product waste.
2. What are the most common causes of false rejects?
False rejects usually come from three areas: “busy” product images (multiple layers, mixed densities, natural variation), packaging and material handling issues (wrappers, cartons, dents, or orientation changes), and outdated inspection technologies that struggle to distinguish normal variation from true contamination.
3. How does dual-energy x-ray inspection help reduce false rejects?
Dual-energy x-ray systems improve inspection accuracy by cutting through visual “noise” in complex products and packaging. That makes it easier to separate real contaminants from normal product variation—helping reduce false positives while still maintaining strong detection performance.
4. How does x-ray inspection software reduce false positives?
Advanced x-ray software can isolate the product from its packaging during analysis, reducing false rejects caused by cosmetic defects or orientation changes. It can also allow teams to fine-tune reject thresholds so inspection stays sensitive to real risks without over-rejecting acceptable product.
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