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How to check for pinholes in multi-stranded enameled wire?

How to check for pinholes in multi-stranded enameled wire? And Xinhe wire to take a look at it!
Enameled wire is currently widely used in electric motors and transformer equipment, there are many factors to determine the quality of enameled wire, one of the keys is to look at the continuity of the film enameled wire, that is, the number of holes in the enameled wire detects a certain length of film.
Stamping can reflect the quality of the enameled wire to a large extent the number of enameled film, the number of pores found less, the integrity of the enameled film of the enameled wire is higher, the use of better, on the contrary, the quality of the enameled wire will be greatly reduced. So how to check the number of pinholes on the enameled wire in practice?
Usually we can enamel film continuity tester is used to check the number of pinholes enameled wire, test the electromagnetic wire is mainly used to contact with the principle of high voltage discharge and concave wheel pressure half of the envelope, when the touch film thickness is not enough or there is a serious bare copper defects, the instrument will respond and record the specific number of defects. You can see the number of pinholes in the enameled wire.
So when we buy the enameled wire, we should also pay attention to check the number of pinholes on the enameled wire, so as to help us judge the quality of the enameled wire, which is also very useful for our use.
First, the enameled wire industry restructuring will continue to accelerate, the diversification of market demand and technology level is an important incentive to promote the restructuring of the enameled wire industry, which also makes the ordinary enameled wire in maintaining stable growth, while greatly increasing the development and promotion of special enameled wire.
Secondly, the concentration of the enameled wire industry will further increase. As China's economy enters a new normal, growth is gradually slowing down and all industries are facing the problem of overcapacity. At the national level, backward production capacity and polluting enterprises are eliminated. At present, Chinese enameled wire enterprises are mainly concentrated in the Pearl River Delta, the Yangtze River Delta and the Bohai Bay region. There are more than 1,000 enterprises in the industry, but they are mostly small and medium-sized manufacturing enterprises, and the industry is not highly concentrated. However, with the continuous acceleration of the downstream industrial structure upgrade of enameled wire, the integration of the enameled wire industry will be further promoted. Reputable, large scale, high technology level of the enameled wire enterprises will have more advantages in the competition, the industry concentration will be further improved.