| 摘要 |
Provided herein is a process consisting in: preparing a folded leaf (1) comprising a first main flap (1a) and a second main flap (1b) which overlap one another and a bottom edge (2) joining the main flaps (1a, 1b); tucking in the folded leaf (1) at the bottom edge (2) to form bellows including a first and a second base strip (3a, 3b) inserted between the main flaps (1a, 1b); making at the bellows short furrows (6), which are incised and welded and are spaced from one another, turning up a base strip (3a) on a main flap (1a) to form triangular pockets (7) at the short furrows (6); fixing the triangular pockets (7) to the base strips (3a, 3b); and separating each bag from the folded leaf (1).
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