First of all, we need to know what the cardboard box manufacturer's bronzing technology is. In fact, it means that the electrochemical aluminum foil is transferred to the paper surface by supercharging. The first way is to investigate the appearance of the telephone aluminum foil paper of the cardboard box manufacturer, a roll of healthy and qualified electrochemical aluminum foil, and the reflection of its surface metal surface. Excellent function, cut or privately out of a small piece, can be reflected by light, more like ancient bronze mirror, and very smooth.
But a roll of unhealthy electrolytic aluminum foil, his color seems relatively dull. This dullness is not due to the dullness of dummy gold, but because the surface treatment is not good, the reflection of light is not synchronized, so the investigation can also play a certain role in screening.