Box file type document folder - is folded from blank, with adjacent boxes connected in concertina manner for storage in folded condition

摘要

The document folder is made from a single sheet of cardboard which is cut and folded. One end is closed by tabs (30) and end tabs (26, 28). The opposite end is closed by a flap (35) with folded in reinforcing ribs. The tab (17) is glued to the strip (40). Successive folders may be joined together on their faces (23, 25) and collapsed flat for storage.