| 摘要 |
<p>A web dryer structure for thermal removal of liquid from a traveling web such as a web of paper coming from the press section of a papermaking machine including a row of upper dryer drums and row of lower dryer drums with the drums positioned to carry the web in a sinuous path successively between upper and lower drums and the web wrapping the upper and lower surfaces of the drums respectively with upper and lower looped felts wrapping the web on the upper and lower surfaces of the drums with the felt guided by felt rolls which for the upper felt is beneath lower drums and for the lower felts are between the upper drums with the felt rolls being hollow roll shells and having glands therein divided so that a first portion of the felt roll faces the onrunning web and a second portion faces the offrunning web with the vacuum means and pressure means connected to the interior of the felt rolls so that one.portion is subjected to a vacuum, and the other portion is subjected to a pressure, and the arrangement accommodates running the web in either direction without the necessity to have any open unsupported travel of the web.</p> |
