| 摘要 |
<p>A dryer section in a papermaking machine has two reversing rolls (18, 20) to form a pocket between each pair of dryers (16, 22) in a dryer tier (15). The first reversing roll (18) is a vacuum roll and the second reversing roll (20) is a grooved roll. A blow box (24) is disposed between the two rolls; the blow box provides suction for the grooved roll and provides vacuum which restrains a web on the dryer fabric (12) as it travels between the first and the second rolls. The blow box (24) also provides a supply of make-up air which extends in a cross machine direction along the pocket formed by the two reversing rolls. The blow box also supports a pivoting foil (54) which is positioned against the dryer fabric (12) as it moves from a first dryer (16) towards the first reversing roll (18). The foil (54) defines a region of low pressure which restrains the web as it travels between the first dryer and the first reversing roll.</p> |
