| 摘要 |
<p>A sheet material (2) for producing packages (17) of food products and having a succession of optically detectable register mark (18); each mark, has a first and a second segment (37a, 37b; 37d) parallel to each other and perpendicular to a feed direction of the material (2), and a sloping segment (37c; 37e) interposed between the parallel segments, so as to define a broken, to substantially Z-shaped line (37), which may be used to determine the position of the material both in the feed direction and in a perpendicular direction.</p> |
