Advantages of X-ray detection equipment over metal detectors
With the continuous improvement of global requirements for food safety and export food hygiene and quality, food processing enterprises are not only strengthening hygiene management, but also striving to improve the level of food testing, which to some extent promotes the continuous development of food testing technology. In the food processing process, some foreign objects are often mixed, such as metallic foreign objects, non-metallic foreign objects, and foreign objects from pre processing. The commonly used testing methods include visual inspection, metal detection, and X-ray testing.
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The metal detector is based on the law of electromagnetic induction, which states that "a conductor cuts a magnetic induction line to generate an induced electromotive force". During this process, the detection magnetic field applied by the metal detector will be captured due to interference from external conductors, triggering the alarm system of the metal detector. X-ray foreign body inspection equipment can detect various dense pollutants and foreign bodies in packaging, loose and pipeline products, including metal, glass, stone, calcified bone, high-density plastic and rubber compounds, etc. through X-ray irradiation and image information processing. It is an ideal choice for detecting packaging products of various sizes and shapes, as well as aluminum foil or metal film packaging products. It is also suitable for detecting vertical hard containers, such as glass bottles, glass cans, and metal cans.
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In addition, metal detectors can only detect metal foreign objects within the product. In practical applications, the conductors that can trigger alarms for metal detectors are mainly metals (natural good conductors), such as swords, metal firearms, metal products, etc. In contrast, substances with poor conductivity such as water and graphite cannot trigger an alarm. In addition, due to the use of balanced coil technology in traditional metal detectors, it is not possible to accurately detect metal foreign objects inside aluminum packaging bags, and the moisture, salt, and sugar content of the product also have a certain impact on the electromagnetic field. Frozen products have good detection results, while products with high thawing water content have average detection results.
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At present, X-ray foreign matter inspection equipment is widely used in the field of food production and processing. Compared with Metal detector, X-ray inspection has the following advantages:
(1) Having better metal foreign object detection capabilities and being able to detect non-metallic foreign objects such as glass and PVC in products;
(2) Having good detection ability for products with high water content of metal foreign objects such as soy sauce and others;
(3) Having good detection capabilities for metal foreign objects such as food coated with aluminum film packaging, dairy products packaged with aluminum foil, and cooked food products;
(4) Not affected by the state of frozen products in terms of detection ability;
(5) Able to inspect lost items and have the function of production shielding inspection.
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To sum up, if we want to effectively enhance food safety, we have more advantages in choosing X-ray foreign matter detector to detect foreign matters in food.
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