As of I believe SolidWorks 2008 we have had the capability to create a loft and unfold it to its flat pattern. There are a few requirements. This 10 minute video maps out the requirements and the how to tutorial on how to use this tool.
Run Time: 10:05
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In case you missed the requirements in the video here they are:
The Design Library contains many pre-made sheet metal parts created with lofted bends. The parts are located on the "parts\sheetmetal\lofted bends folder.