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For downspout forming machine, the common forming methods mainly include pressing, forging, extrusion and welding, so that the equipment can be formed.
a wrought iron–steel sheet was coated with zinc and then roll-formed into profiled sheets.
Appendix A of Frontiers of Political Economy Appendix:
due to the advancement of roll forming technology, people turn to roll formed pipes, and in modern times, most of the downspouts or rainspouts have been produced from pre-painted steel, galvanized steel, aluminum or copper.