| 摘要 |
A method of manufacturing a novel rectangular, flat-bottomed bag from a sheet of thermoplastic material in which the sheet is folded, a gusset formed at the fold line and a portion of the gusset turned upon an adjacent bag wall to form an outer planar bottom wall and side gusset. The formed sheet is then heat sealed by one or two operations at the planar bottom wall to form an X-weld across the bottom wall, triangular portions of the bottom wall defined by the X-weld severed and removed, and the sheet transversely welded and severed along a line intersecting the center of the X-weld.
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