Steel purlins are necessary for pre engineered steel industrial buildings, and some residential building as well, and various kinds of c/z purlin roll forming machines have been developed to produce C/Z/U steel purlins, Sigma/M purlins sometimes are also available. In accordance with different requests for C and Z steel purlins, we have specified C purlin roll forming machines for production of C steel sectional channels, Z purin roll forming machines for manufacturing of Z shaped channels and interchangeable C/Z purlin roll forming machines which are designed to produce both C and Z steel purlins without replacing any rolling tools or cutting dies. They are mostly galvanized or cold rolled steel strips from feeding, punching for holes, bending and cutting.