Cylindrical shell, e.g. for producing columns, is made by winding material and sewing overlapping edges together

摘要

The cylindrical shell is produced by winding a strip (1) of material, which may come in any one of a wide range of widths, and sewing the overlapping edges of it together. Simple sewing machines (2) can be used for this purpose. Further elements can be integrated into it at the production stage for greater versatility.