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Free fall. Drop-type metal detectors are generally equipped with automatic rejection devices, so it is customary to call them drop-type metal detectors. The packaging requirements of metal detectors for products are that they cannot contain metal, but considering the high requirements of sealing and light protection, metal composite films must be used for packaging. The metal composite film itself is metal, so if a channel-type metal detector is used, the detection sensitivity will have a large deviation or even cannot be detected. For the above reasons, testing prior to packaging may be an option. Drop-type metal detector The drop-type metal detector was developed for the above-mentioned situation, and is mainly used for the detection of flakes, capsules, granules (plastic particles, etc.), and powdered articles. When these items fall through the falling metal detector, once metal impurities are detected, the system immediately activates the separation mechanism to exclude suspicious items. It has the characteristics of simple installation, high sensitivity, convenient maintenance, high efficiency, stability and reliability. -3 Pipeline. Ordinary metal detectors cannot completely monitor the entire production process of fluid products, such as ham sausage, chewing gum, oral liquid, sauces, etc. The pipeline-type metal detector can remove metal impurities online in real time to ensure the safe delivery of products to next process. If divided by function: ① All-metal detector: It can detect all metals such as iron, stainless steel, copper, aluminum, etc. The detection accuracy and sensitivity are relatively high, stable and reliable. ② Iron metal detector: It can only detect iron metal, commonly known as needle detector. The detection accuracy and sensitivity are low, and it is easy to interfere. ③ Aluminum foil metal detector: It can only detect ferrous metals, but its detection accuracy and sensitivity are still high when detecting products with aluminum foil packaging.