| 摘要 |
A dryer apparatus is disclosed for drying a web (WI) extending through a dryer section (10I) of a paper machine. The apparatus includes a first and a second dryer (38I, 39I). A dryer felt (52I) movably extends around the dryers (38I, 39I) such that the web (WI) is disposed between the dryers (38I, 39I) and the felt (52I) for drying the web (WI). A vacuum transfer roll (46I) is disposed downstream relative to the first dryer (38I) and upstream relative to the second dryer (39I) such that the web (WI) and the felt (52I) extend around the transfer roll (46I) so that the felt (52I) is disposed between the web (WI) and the transfer roll (46I) when the web (WI) and the felt (52I) move around the transfer roll (46I). A seal device (74) extends between the first and the second dryers (38I, 39I) for reducing a flow of air between the first and the second dryers (38I, 39I) into a pocket (76) defined by the transfer roll (46I) and the felt (52I) extending between the dryers (38I, 39I) and the transfer roll (46I). The transfer roll (46I) includes a perforate shell (80) connected to a source of partial vacuum (78) such that in use of the apparatus, a partial vacuum is generated within the shell (80), for inducing a further partial vacuum within the pocket (76) so that air flows in a direction from the web (WI) towards the felt (52I) for urging the web (WI) into close conformity with the felt (52I) during movement of the web (WI) around the transfer roll (46I) and also during movement of the web (WI) between the dryers (38I, 39I) and the transfer roll (46I). |
