| 摘要 |
<p>A web conveying roller (18) is provided with circumferentially or spirally extending grooves (42) and radially stiff lands (44), the lands having convex curvatures (46, 48; 54) to cause a conveyed, ultrathin web (30), at the beginning of a wrap angle ( alpha ) onto the roller (18), to undulate along the width of the roller (18) over the lands (44) and into the grooves (42) while remaining spaced from the convex curvatures of the lands (44); so that, air entrained between the web (30) and the lands (44) can flow into the grooves (42). <IMAGE></p> |
