The issuance of construction aluminum production licenses for this round of construction began in 2004. By the end of 2006, the China Non-ferrous Metals Industry Association’s Office for Production of Aluminum Profile Production Licenses had issued 550 licenses, that is, 550 aluminum. Extrusion enterprises received the aluminum production license. Most of these companies produce both industrial extrusions and construction extrusions, and a few produce only building materials.
Since the issuance of construction aluminum profile production licenses, the quality of construction aluminum extrusion materials has been greatly improved, which has played a significant role in the renovation of the aluminum construction market. The number of unqualified products that have flown into the market has been greatly reduced. However, according to the spot inspection of the quality inspection department, there are still unqualified products, and even a very small number of products are produced by enterprises that have production licenses.
Unqualified products enter the circulation field and are extremely harmful. They are a waste of resources and energy, and sometimes even cause safety accidents. According to the survey, the main performance of unqualified architectural aluminum profiles is: the chemical composition is unqualified, mainly because the impurity iron content is too high. The reason is that excessive wastes are used excessively, and no serious refining, diluting and removing iron are performed; Thickness is not up to standard and uneven, color is also inconsistent, because the oxidation treatment time is too short, the formation of "sheep mutton" type of treatment, the thickness of the oxide film of individual products is only 4μm ~ 7μm; wall thickness is too thin, found in the sampling wall thickness To 0.8mm.