| 摘要 |
<p>A vacuum roll transfer apparatus (16) is disclosed for drying a web (W) extending through a single tier dryer section (10) of a paper machine. The apparatus (16) includes a rotatable perforate shell (18) having a first and a second end (20, 22). A stationary duct (24) is disposed within and along the length of the shell (18) between the ends (20, 22) of the shell (18). The duct (24) is connected to a source of partial vacuum (26) and the shell (18) defines a plurality of holes (28, 29, 30, 31, 32, 33, 34, 35, 36, 37) along the length thereof such that in use of the apparatus (16), when the duct (24) is connected to the source of partial vacuum (26), a partial vacuum is generated within a chamber (38) defined between the shell (18) and the duct (24). A flow restricting arrangement is disposed within the duct (24) for generating a greater vacuum level adjacent to at least one of the ends (20, 22) of the shell for facilitating threading of a tail (T) of the web (W).</p> |
