Since the invention sandwich in the world, developed countries are widely used in various industrial and civil buildings, the sandwich is an excellent building material, such as a building's roof, wall, ceiling, etc., the actual the sandwich panels have already left behind the era of brick, sandwich price, light weight, high strength, thermal insulation, easy construction, the surface does not have to be decorative, steel sandwich panel prices, already It reached a high-grade appearance. Today, the sandwich panels used in the building is on the rise year by year. Upper and lower surfaces: galvanized color steel, thickness of 0.4-0.8mm. According to the specific requirements of customers, but also can color galvanized steel or galvanized steel. After the first steel roll forming machine composite rock wool factory.