| 摘要 |
A web of bag-making material consists of a flattened tube or a single sheet that is longitudinally folded to double thickness. The bags are formed by providing the web with transverse weld seams at intervals and, adjacent to these seams, with lines of perforations extending parallel thereto. The web is then folded and, after folding, the individual bags are severed along the lines of perforations. |
