| 摘要 |
<p>The specification discloses a steam distributor having a chamber to contain steam on one side of a paper web and a vacuum box on the opposite side of the paper web. The chamber has a vacuum release device to prevent the chamber from being pulled onto the paper web if vacuum is applied when steam is not applied. The vacuum release device in one embodiment consists of two flaps substantially closing off the spaces between the bottom of the steam distributor and paper web. The flaps are hinged so that if vacuum is applied when steam is not applied ambient air forces open the flaps.</p> |
