| 摘要 |
<p>PURPOSE:To facilitate a recycling, by making a transparent film water-soluble in the recycling process when recycling window envelopes by sticking a water- soluble film at the window, in a paper envelope having a window at the front or the rear. CONSTITUTION:A window envolope 1 is made of paper as a whole and the window 3 is formed at the upper part 4 of the center of the front paper 2 by punching. The address, name, etc., written on the contents contained in the envelope 1 can be read from the outside through the window 3. A larger transparent film than the window 3 is stuck at the window so as to extend to the periphery of the window. In this case, a water-soluble film such as polyvinyl alcohol resin is used as a transparent material. In this way, when a window envelope 1 is recycled, since the transparent film 4 is water-soluble in the recycling process, the treatment is facilitated.</p> |
