| 摘要 |
A method of making a support sheet-containing plastic film pocket for use in files. A continuous thin-film tubular material formed continuously by synthetic resin inflation molding is folded at opposite sides thereof into a flat tubular sheet consisting of an upper thin-film sheet and a lower thin-film sheet. The upper thin-film sheet is cut centrally along the length thereof. Two halves of the cut upper thin-film sheet are opened, and support sheets are inserted between respective opened halves of the upper thin-film sheet and corresponding portions of the lower thin-film sheet. Cut edge portions of the upper thin-film sheet are tacked to the lower thin-film sheet. Then, the thin-film tubular material, with support sheets inserted therein, is cut to a predetermined size of a target plastic film pocket. One end resulting from this cutting is welded. Again, the cut edge portions of the upper thin-film sheet or portions adjacent thereto are welded to at least the lower thin-film sheet. |
