Roller coating is an important process in all aluminum alloy sheet waterproofing coil coating production lines. The quality of sprayed products, especially the quality of conductivity, directly endangers the actual effect of the decorative design of goods.

An employee works at a copper processing plant in Dongyang, Zhejiang province. [Photo by BAO KANGXUAN/FOR CHINA DAILY]Authorities plan month-end release of copper, aluminum and zinc reserves China on Wednesday announced plans to release the second batch of copper, aluminum and zinc from the national