To deal with the malfunction of the needle detector caused by the defective products
In the products of operation, sometimes the needle detector will react due to the different types of dyes. For example, in the case of a certain color, almost all of them can pass the needle detector, but in other colors, the phenomenon of failure occurs because some dyes contain iron oxide. At this time, it is necessary to change the dyes to use the needle detector normally.
The rubber used in the bottom of shoes and other products often contains a lot of metal powder. In this case, there is no broken needle and other metal fragments in the tested products, but because it contains a lot of tiny iron powder, the transfer needle detector will also react to the overall metal content. At this time, the hand-held needle detector may often fail to detect product abnormalities. Because the portable needle detector is pressed on the tested product for detection, it can detect smaller foreign matters than the transport needle detector. However, in the above cases, the sensing strength of the hand-held needle detector is relatively high, but the area of the needle detector is very small, and the area of the reaction body of the sensor is smaller, so it often occurs that the hand-held needle detector cannot detect foreign matters.
In addition, if clothing and other sewn products use metal accessories, first of all, make sure that accessories (metal zipper, metal bead chain, etc.) do not contain iron, cobalt, nickel, these three magnetic metal components. If the above-mentioned magnetic metal reaches a certain content in the accessories, the product will not pass the inspection of the needle detector.