Metal detection in food packaging is a crucial process and plays a very important role in the quality control system of the entire food packaging.The metal detector for food packaging is a piece of special detection equipment for various metal impurities in food packaging such as meat, fungi, candy, beverages, grains, fruits and vegetables, dairy products, aquatic products, health products, additives, and condiments. Different from other types of metal detectors, this metal detector is mainly used for various types of food packaging. It is very different from other metal detectors in terms of the type of metal detected, the detection range, and the detection depth.

Food metal detectors apply the principle of electromagnetic induction to detect metals. All metals including ferrous and non-ferrous have high detection sensitivity. The entry of ferromagnetic metals into the detection area will affect the distribution of magnetic field lines in the detection area, thereby affecting the magnetic flux in a fixed range. When non-ferromagnetic metals enter the detection area, an eddy current effect will occur, and the magnetic field distribution in the detection area will also change. Causes the detector to beep.

The accuracy and reliability of the detector depending on the stability of the frequency of the electromagnetic transmitter, which generally uses an operating frequency from 80 to 800 kHz. The lower the working frequency, the better the detection performance of iron; the higher the working frequency, the better the detection performance of high carbon steel. The sensitivity of the detector decreases with the increase of the detection range, and the magnitude of the induced signal depends on the size and conductivity of the metal particles.