This is the first color steel downpipe roll forming machine in China with carious freedom intellectual house and national patent. Pre-punching and roll forming strip components with pre-punching devices from ARKU. The hydraulic punching units perforate the coils previous to roll forming. The TwinShuttle strip guide and also the Weldomatic® https://riverypdqe.blogkoo.com/little-known-facts-about-downspout-roll-forming-machine-51822755