| 摘要 |
<p>A bossed draining membrane and the relative manufacturing process and device including a bossed draining membrane consisting of at least one sheet made of plastic material, usually but not exclusively polythene, whose surface, of which at least one of the faces includes a plurality of relieves projecting from the same side and one or more areas free from said projecting relieves, obtained by means of the extrusion of plastic material in the fluid state will form two plastic films subsequently coupled so that then, the coupled sheet obtained in this way, is forced to descend in a softened state on a shaping roller whose shell is provided with numerous projecting and removable shaping bodies and, subsequent to shaping, is air cooled and directed to a reel for packing.
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