Color trends First, the use of high-quality substrates, for the substrate surface, shape and dimensional accuracy requirements are higher and higher, outdoor use, such as small spangle flat galvanized steel coil, galvanized spangle-free smooth Coil timely under the rise of hot-dip zinc alloy volumes; for indoor use, such as galvanized steel coils, cold-rolled plates and aluminum foil roll. Second, to improve the pretreatment and pretreatment solution, a small amount of equipment, Henan facades Rockwool board manufacturers, low cost technology to become mainstream, scaffold exterior wall rock wool board, continue to improve the stability of the pretreatment liquid, corrosion resistance environmental performance. Third, the external walls of rock wool board, focusing on the development of new coatings for general polyester, polyvinylidene fluoride (PVDF) and plastisol make improvements, the external walls of rock wool board factory in Changzhi, get super color reproducibility, UV anti-dioxide rock wool core material: the density of 120kg / m & sup3; rockwool block interleaving laying its fiber direction perpendicular to the sandwich, the lower surface, and closely connected to enrich the entire vertical and horizontal surfaces of sandwich panels. And wool and, through high-strength adhesive foaming agent between the lower plate is formed integrally between rockwool block, sophisticated production process to ensure produce extremely high density rockwool insulation between the body and the metal plate inside wall strong adhesion, so that the rock wool sandwich panel has a good stiffness.