At present, color steel sheets can be divided into two series, pre-coated sheets (PCM) and film-coated sheets (VCM) according to the different compounding methods of products. The difference between the two is that the metal sheet is used as the base material and the surface composite material is different. The surface of VCM conforms to the polymer film, and the surface of PCM is coated with polymer paint.
The process of the laminating unit is a thermal lamination method. The film is made by transmitting the color film through the coating belt, heating it to a certain extent at a high temperature, and then pasting the color film on the steel plate, and then cooling it. This method has high speed and high production efficiency; no waste gas is generated, and the efficiency is close to that; by adjusting the roller gap, pressure and roller speed, the thickness of the color film can be adjusted within a certain range; layer film.
The performance requirements of the coated steel plate mainly include the mechanical properties of the material (tensile strength, yield strength, elongation), coating properties (coating type, coating thickness and coating adhesion) and color film properties (color film variety, color, gloss, durability performance, processability, etc.). Among them, wind, impact, snow, shock, etc. are all related to the mechanical properties of the material, and of course also related to the waveform of the color profiled steel plate, the thickness of the steel plate, the span, and the purlin distance. , not only can the coefficient of the building but also reduce the project cost. The durability, processing performance and appearance retention of the material are mostly determined by the durability of the film and coating.
