| 摘要 |
<p>A reusable core 72 for receiving sheet material (74 fig. 13), which may be paper or plastic, has a cover 76 made of a shrink wrap and is heat shrunk onto the core 72. The cover 76 is not able to be split by pressures when winding sheet material (74 fig. 13) over the core 72 and is removable from the core 72. The diameter of the cover 76 may enable it to shrink in a minimum time under heat application. The cover 76 may be seamless and extend the entire length of the core 72. The cover 76 may be removed by being cut from the outside. The core 72 may have a body 78, a bore 80 and first and second ends 82, 86 with flanges 90, 92 for abutting the body 78. The ends 82, 86 may include gripping means which may be slots (140 fig. 8). The body 78 of the core 72 may be made of aluminium and the ends 82, 86 may be made of polyethylene. The core 72 may include a radio frequency identification device 164 and/or earthing means 162. The shrink wrap may be polyolefin or polyvinyl. Heat shrinking may take place by using an oven or by blowing hot air.</p> |
