Roll forming machine can rollform different sizes of C or Z purlin without changing any rollers. The thickness, width and height are adjustable and fully controlled by the computer automatically. All you need is just key in sizes and press the control button and then machine will automatically adjust the rollers according to your requirement. The time during adjusting rollers is around 2 ~ 3 minutes without changing rollers. After roll formed by this roll forming machine, the surface will be very smooth and beautiful without any scratch on surface.