Envelope for transferring documents or samples, has ends acting as bellows with perforations, where width of envelope between its lateral edges is adapted to dimension of tube of pneumatic network

摘要

The envelope has ends acting as bellows (1a, 1b) with perforations. The width of the envelope between its lateral edges (1c, 1d) is adapted to the dimension of a tube of a pneumatic network. The bellows inflate to take the shape of the tube when compressed air is sent through them to propel the envelope for transfer. A slit closed by a self-adhesive tape (2) provides access to the interior of the envelope.