Best price double deck roll forming machine of 840 This double deck roll forming machine of 840  combine high functionality with the expanded design possibilities of commercial metal roofing and metal wall panels. Strong, versatile and energy efficient, and in colors that enhance any design, we make executing striking commercial designs simple. Our wide variety of commercial metal roof, siding and wall profiles can achieve any design strategy or intent.   Double Roof Panel press is introduced with galvanized steel production line color or different color steel or aluminum as raw materials, production of Double Roof Panel roll forming machine used in the roof of the building external plate and wall board and interior decorating plate or, ceiling, etc.