Food safety is inseparable from metal detector
It's nothing new in China to eat metal foreign matters from the purchased food. "Lucky" points eat a steel wire, which is also the heart diaphragm point; "unlucky" points directly eat a steel needle, blade, pierced the mouth have to worry about whether there is any virus attached to it. There have been some cases where the brand effect of the company's products has been greatly reduced due to the mixing of metal impurities into the food, and it is necessary to redouble efforts to restore it. Once it has developed to the point of litigation, it is likely to incur huge litigation and compensation costs; in addition, if the mixing of metal impurities causes damage to high-end production equipment, it will not only generate the repair costs of the equipment, but also cause damage to the high-end production equipment. All kinds of waste in production. Although there are strict management procedures in the production process, and protective measures are taken for the mixing of metal foreign matters, the metal foreign matters can not be eliminated completely. Because, all processes that need to contact the metal surface directly in the production process may be mixed with metal impurities.
Metal mixing caused by raw materials, such as:
In meat: there are residual broken needles;
Powder raw materials: mixed nails, fishhooks, staples, etc.
Artificially caused: such as buttons, coins, keys, rings, necklaces, etc.
Caused by production site repair: forgotten screwdrivers, nuts, screws, welding slag during welding, insufficient metal scraps cleaning, etc.
Caused by the project in the workshop: in the production of candy, raw materials will be filtered through the sieve, while the sieve used for a long time is easy to wear and age, and the mesh wire is easy to fall off and fall into the syrup. There are also the main reasons for the metal mixing, such as the rust of the aging equipment, the old defective pieces, the parts on the conveyor belt, the broken pieces of the stainless steel screen, the slicer and the blade of the crusher.
Food metal detector for food safety
At present, the safety of food metal detector and the hygiene and quality requirements of exported food are more and more strict all over the world. To prevent metal impurities from mixing into food products has become the top priority of the quality management of food companies.
How to detect these metals in food?
Food metal detector is used with the improvement of the requirements of food hygiene detection. The main detection object of food metal detector is metal, which can be roughly divided into stainless steel, ferromagnetic metal and non-ferrous metal. The difficulty of detection is determined by the conductivity and magnetism of the metal itself.
If the iron metal itself is magnetic and conductive, it can be easily detected.
If it is copper, lead, aluminum and other non-ferrous metals, although not magnetic, but good conductivity, relatively easy to be detected;
There are many kinds of stainless steel products, some of which are magnetic and some of which are not, and the conductivity is not the same.
In the food industry, 304 and 316 stainless steel products are most commonly used, so their lowest sensitivity is often regarded as the main detection range of metal detector. At present, most of the metal detection machines are one-piece detection coil. Because of its relatively good stability and sensitivity, it has also been widely used.
Food metal detector for food safety
In addition, metal detector is based on the measurement of conductivity and magnetic field to detect metal. But many of the inspected foods have the "characteristics" of some metals, which can easily lead to misjudgment. For example, products with high iron content, such as cereals, can generate strong magnetic signals; products with high moisture and salt content, such as bread, meat and milk, are conductive and misleading. The detector must "see" whether there is any small metal residue in the food which is easy to cause misjudgment.
Therefore, the selection of food metal detector must be careful, and priority should be given to strong manufacturers.