| 摘要 |
<p>An apparatus (10B) is described for maintaining a first and second lateral edge (38, 40) of a web (WB) in close conformity with a dryer felt (16B) of a papermaking machine. The apparatus (10B) includes a first dryer drum (11B) which is rotatable about an axis (42) which is parallel to the cross-machine direction (CM) of the web (WB). A second dryer drum (12B) is rotatable about an axis (44) which is spaced and parallel relative to the axis (42) of the first dryer drum (11B). An intermediate transfer roll (46) has an axis of rotation (48) disposed in a plane (P) parallel to, and between, the axes (42, 44) of the first and second drums (11B, 12B) such that the web (WB) and the felt (16B) extend contiguously around the first dryer drum (11B) and then around the transfer roll (46) and subsequently around the second drum (12B) in a serpentine configuration so that the transfer roll (46) and the felt (16B) define therebetween a pocket (30B). A first and second box (50, 52) are disposed within the pocket (30B) and adjacent to, respectively, the first and second lateral edges (38, 40) of the web (WB) for maintaining a partial vacuum within the pocket (30B) adjacent to the respective lateral edges such that the edges (38, 40) are drawn into close conformity with the felt (16B) which is disposed between the web (WB) and the boxes (50, 52) thereby inhibiting detachment of the respective lateral edges (38, 40) from the felt (16B) and subsequent wrinkling of the dried web (WB).</p> |
