| 摘要 |
<p>The folder, realized by means of the machine according to European Patent application no. 89 830 178.3, is obtained by the working of transparent polypropylene for forming the upper sheet (2), and of opaque polypropylene for the lower sheet (3), which is then folded for realizing the back (4) on which an opening (5) is provided for inserting the nippers (6) for blocking the sheets of paper, of rolled plastic, shaped and folded.</p> |
