| 摘要 |
The bag consists of two walls (12, 14) made from sheets of a multi-layer, synthetic material, welded together along part of the perimeter. One of the walls has two or three rectilinear, longitudinal rough stripes (16a, 16b, 16c) on its inner surface, obtained by hot-printing and extending substantially along the full length of the bag. The stripes are obtained by pressing a welding bar, coated with a rough, non-adhesive material, such as teflon cloth, against the multi-layer sheet forming the wall of the bag. <IMAGE> |
