Packaging for food is an important part of ensuring that the product reaches consumers in a safe and contam-free condition. Metal detectors are commonly used to check for metal objects, such as nails and staples, inside food packaging. While they may seem like a nuisance, metal detectors can play an important role in ensuring that your products reach consumers in the best possible condition.

What is metal detectors for food packaging ？

Metal detectors are used to detect any metal objects that may be inside food packaging. This is especially important for products that are high in metal content, such as canned foods and meat products.

Metal detectors can be used in a variety of settings, such as food production facilities and warehouses. They can also be used in retail stores and restaurants. Metal detectors are often used in conjunction with other safety measures, such as X-ray machines.

Working principle of metal detector for food packaging

When it comes to detecting metal objects, the principle is much the same as for any other type of detection. The metal detector will send out a signal that is detected by a detector and electronics. The electronics will then process the information and display it on a screen. This is how objects are detected and what information is displayed.

Most metal detectors work by sending out a magnetic field and detecting the objects that are attracted to that field. This works well for detecting metals that are near the surface, like in food packaging. However, it doesn’t work so well for metals that are buried deep within the package. That’s where the second type of detector comes in handy.

The second type of detector uses sound waves to detect metal objects. This works well for detecting metals that are buried deep within the package. However, it doesn’t work so well for metals that are near the surface, like in food packaging.

Composition of metal detectors for food packaging

Metal detectors for food packaging are composed of a variety of technologies that detect different metals. The most common technology used in metal detectors is electromagnetic radiation. This type of detector uses an antenna to sense metal objects and send a signal to a receiver, which then displays the information on a screen. There are other types of metal detectors that use ultrasonic waves or heat to detect metals.

Part 1: Detector coil

The detector coil has a built-in “balanced coil”, three coils are wound on a non-metal frame or a former, and the coils are completely parallel, and the middle coil (transmitting coil) generates a magnetic field through high-frequency current. The two coils on either side of the middle coil are the receiver coils. Since the two coils are exactly the same and kept at the same distance from the transmitter, their induced EMFs are exactly the same.

When these coils are connected in reverse, the electromotive forces cancel each other out, resulting in a “zero output”, a state of equilibrium. It is then poured with cement to ensure that when no product passes through, the magnetic field is in a state of dynamic equilibrium and is not affected by external environments such as temperature changes, vibration, and electromagnetic interference.

During the detection, the product passes through three coils one after another. If it contains metal foreign objects, the balance of the magnetic field will be broken, and an induced current will be generated to detect various metal foreign objects.

Part 2: Control Panel

The user interface/control panel, commonly including touch screen and button type, is usually mounted directly on the Detector coil. However, if the sensor coil is too small, or is installed in a confined space or in an inaccessible location, it can be installed and controlled remotely using a connecting cable.

Part 3：Transmission System

The transmission system is used to make the food package to be tested pass through the detection port of the metal detector. The most commonly used transmission device is the horizontal conveyor belt type. At the same time, for different product applications, the gravity drop type (powder or granules transmitted in the pipeline) can be selected. Horizontal in-line (liquid and fluid) and plastic channels are commonly used in the pharmaceutical industry.

Part 4: Automatic Rejection System

This system is used to remove any metal-contaminated or possibly metal-residue food packaging from the line and is usually installed on a conveyor system. There are many different types, including blower, pusher, flap, etc. The type of automatic rejection system will depend on the food that needs to be tested.

The specific application of metal detectors for food packaging

Food packaging is often made of metal. This makes metal detectors an important tool for the safety of food. Metal detectors can help to identify potential hazards, such as sharp edges on food packaging that could injure someone if ingested. Metal detectors can also help to detect counterfeit goods, which could pose a health risk.

Where should metal detectors for food packaging be installed ?

Metal detectors for food packaging should be installed in areas where there is a high chance of containing metal objects, such as the manufacturing area, receiving area, and storeroom.

Conclusion

Metal detectors can be a great way to prevent food tampering and theft. Not only do they work well in detecting metal objects, but they are also sensitive enough to detect other items, like plastic bags and bottles. This makes them ideal for use in food packaging plants, where workers need to keep an eye out for anything that could lead to product spoilage or theft. Guangdong Kenwei Intellectualized Machinery Co. is a producer of highly efficient and precise weighing and packaging systems. The Kenwei multihead weigher has been our most popular piece of production line equipment.

Author: Kenwei–Multihead Weigher Manufacturers

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Author: Kenwei–Metal Detector Manufacturer

Author: Kenwei–Food Metal Detector

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