| 摘要 |
<p>A core for winding a web of deformable material, such as photographic film base, which has knurlings along its margins. The core (10) includes a rigid cylindrical member (16) with a sleeve (18) of resilient material. The sleeve has a cylindrical outer surface and has a length less than the distance between the margins containing the knurlings. There are means (20, 22) contiguous with the ends of the sleeves for providing cylindrical surfaces having diameters substantially equal to that of the sleeve. These means underlie the knurlings in the web when the web is wound on the core and may take the form of resilient material which is harder than the sleeve, or they may be rigid. In the latter case the surface-providing means may be integral with the rigid cylindrical member.</p> |
