Mini-Encyclopedia of Papermaking Wet-End Chemistry
Part Three: Equipment & Unit Operations


Fourdrinier machines may be modified with the addition of a top-wire dewatering unit, making it possible to produce a sheet with greater symmetry and much better dewatering. The next further step in sophistication is to place a headbox and dewatering elements on the top unit, making it into another Fourdrinier former. The two sheets are joined together when the forming fabrics come together. Some paper machines are set up with separate stock systems for different headboxes, making it possible to use premium fibers or other materials in a top ply.

Request from the webmaster: Our goals include brevity and accuracy. Hopefully we have succeeded with the first goal without sacrificing the second. Please let us know right away if you find an error or omission. Also, please indicate points that need a clearer description.


Home page Research opportunities Business opportunities Background information Links to wet-end chemistry E-Mail
This page is maintained by Martin hubbe, Associate Professor of Wood and Paper Science, NC State University, .