Application of metal detector in the pharmaceutical industry

In recent years, due to the continuous enhancement of the product quality awareness of end-user companies and the GMP certification of the pharmaceutical industry, relevant regulations have been made on the online testing equipment of manufacturing companies. This article will discuss the online testing equipment and technology used in the pharmaceutical industry.

During the production and processing of drugs, metal powders, particles, and needle-shaped irregularities are often mixed into the product due to equipment wear, manual negligence, etc., which brings great harm to the safety of the drug, thereby impairing the production of the drug. The reputation of the company has caused great losses. Therefore, we often use metal detectors to detect products to prevent the existence of metal foreign bodies in the products.

Principle of metal detection machine

Most metal detection machines are composed of two parts, namely the detection head (including the sensor) and the automatic rejection device. Among them, the detection head is the core part. The three sets of coils are fixed in the detection head, and the high-frequency AC magnetic field is generated by the oscillator connected to the radiation coil in the middle. At the same time, the receiving coils on both sides are connected so that the induced voltage is not disturbed by the magnetic field. The former cancel each other out. Once the metal impurities enter the magnetic field area: the signals output by the two input coils cannot be cancelled, the metal detector can detect the presence of metal, and the un-cancelled induced voltage passes through the sensor and is processed by the control system to generate a rejection signal. It is sent to the automatic rejection device to remove metal impurities from the production line.

Application of metal detector

Tunnel metal detection machine

At present, the most common metal detection equipment on the market is a tunnel-type metal detection machine. This type of metal detection machine is mainly for online inspection of finished and semi-finished products, and provides final inspection before shipment.

Free fall metal detection machine

The metal detection machine requires that the product packaging must not contain metal, but many manufacturers take into account the tightness of the packaging and require high light-proof properties, and use metal composite film for packaging. However, the metal composite film itself is metal, so the detection sensitivity of the tunnel type metal detector will have a large deviation. In this way, we can only choose to use the packaging conveyor needle detector