3: the only advantages of bending machine vas last generation of roll forming Line is can produce profile with different section drawing among of length. For example, the 9-meter octagonal light beam just can produce by bending machine cause the strip width and section drawing is not same from bottom to top.
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4: the advantages of new generation of roll forming vs old type is we can form different drawing section with one roll forming line by automatic roller change that old roll forming machine just produce one specific section of profile. So bending different size of section by same strips is not advantages any more compare with new roll forming machines.
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5: for production time and energy usage with labor cost, for sure roll forming line are more economic and fast. One line of automatic roll forming can easily operate by 2 workers in normal speed (15m/min).
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