How to detect unqualified packaging steel strip

Packaging steel strip is indispensable part of the logistics in our country, the current packaging steel strip development space is huge in our country, it has good prospects for industrial production. Processing packaging steel strip production in recent years of small and medium-sized enterprises to more and more, product quality is uneven, in this case how to detect unqualified packaging steel strip is the most concern for many users. 1, from the appearance of the packaging steel strip surface quality by visual inspection, colour and lustre and size with the corresponding precision measuring instrument or measuring. 2, measuring, rocker put platform, the steel strip tested part with one metre long ruler on the concave measuring side of stick steel strip, the biggest distance measurement meter scale to the concave side. 3, packaging steel strip of film thickness and the plating thickness of the galvanized steel belt with corresponding precision measuring instruments. The site measurement should be from the edge of steel strip is not less than 3 mm, roughly equal intervals, and the length of not less than 10 mm. Three measuring points on each side, the arithmetic average of the six test values, is the film thickness and coating thickness.